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3715 lines
94 KiB
3715 lines
94 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* sh.c -- a prototype Bourne shell grammar parser |
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* Intended to follow the original Thompson and Ritchie |
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* "small and simple is beautiful" philosophy, which |
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* incidentally is a good match to today's BusyBox. |
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* |
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* Copyright (C) 2000,2001 Larry Doolittle <[email protected]> |
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* |
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* Credits: |
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* The parser routines proper are all original material, first |
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* written Dec 2000 and Jan 2001 by Larry Doolittle. |
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* The execution engine, the builtins, and much of the underlying |
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* support has been adapted from busybox-0.49pre's lash, |
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* which is Copyright (C) 2000 by Lineo, Inc., and |
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* written by Erik Andersen <[email protected]>, <[email protected]>. |
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* That, in turn, is based in part on ladsh.c, by Michael K. Johnson and |
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* Erik W. Troan, which they placed in the public domain. I don't know |
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* how much of the Johnson/Troan code has survived the repeated rewrites. |
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* Other credits: |
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* b_addchr() derived from similar w_addchar function in glibc-2.2 |
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* setup_redirect(), redirect_opt_num(), and big chunks of main() |
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* and many builtins derived from contributions by Erik Andersen |
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* miscellaneous bugfixes from Matt Kraai |
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* |
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* There are two big (and related) architecture differences between |
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* this parser and the lash parser. One is that this version is |
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* actually designed from the ground up to understand nearly all |
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* of the Bourne grammar. The second, consequential change is that |
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* the parser and input reader have been turned inside out. Now, |
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* the parser is in control, and asks for input as needed. The old |
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* way had the input reader in control, and it asked for parsing to |
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* take place as needed. The new way makes it much easier to properly |
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* handle the recursion implicit in the various substitutions, especially |
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* across continuation lines. |
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* |
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* Bash grammar not implemented: (how many of these were in original sh?) |
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* $@ (those sure look like weird quoting rules) |
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* $_ |
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* ! negation operator for pipes |
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* &> and >& redirection of stdout+stderr |
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* Brace Expansion |
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* Tilde Expansion |
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* fancy forms of Parameter Expansion |
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* aliases |
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* Arithmetic Expansion |
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* <(list) and >(list) Process Substitution |
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* reserved words: case, esac, select, function |
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* Here Documents ( << word ) |
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* Functions |
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* Major bugs: |
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* job handling woefully incomplete and buggy |
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* reserved word execution woefully incomplete and buggy |
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* to-do: |
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* port selected bugfixes from post-0.49 busybox lash - done? |
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* finish implementing reserved words: for, while, until, do, done |
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* change { and } from special chars to reserved words |
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* builtins: break, continue, eval, return, set, trap, ulimit |
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* test magic exec |
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* handle children going into background |
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* clean up recognition of null pipes |
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* check setting of global_argc and global_argv |
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* control-C handling, probably with longjmp |
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* follow IFS rules more precisely, including update semantics |
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* figure out what to do with backslash-newline |
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* explain why we use signal instead of sigaction |
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* propagate syntax errors, die on resource errors? |
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* continuation lines, both explicit and implicit - done? |
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* memory leak finding and plugging - done? |
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* more testing, especially quoting rules and redirection |
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* document how quoting rules not precisely followed for variable assignments |
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* maybe change map[] to use 2-bit entries |
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* (eventually) remove all the printf's |
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*/ |
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#define __U_BOOT__ |
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#ifdef __U_BOOT__ |
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#include <malloc.h> /* malloc, free, realloc*/ |
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#include <linux/ctype.h> /* isalpha, isdigit */ |
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#include <common.h> /* readline */ |
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#include <console.h> |
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#include <bootretry.h> |
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#include <cli.h> |
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#include <cli_hush.h> |
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#include <command.h> /* find_cmd */ |
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#ifndef CONFIG_SYS_PROMPT_HUSH_PS2 |
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#define CONFIG_SYS_PROMPT_HUSH_PS2 "> " |
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#endif |
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#endif |
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#ifndef __U_BOOT__ |
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#include <ctype.h> /* isalpha, isdigit */ |
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#include <unistd.h> /* getpid */ |
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#include <stdlib.h> /* getenv, atoi */ |
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#include <string.h> /* strchr */ |
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#include <stdio.h> /* popen etc. */ |
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#include <glob.h> /* glob, of course */ |
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#include <stdarg.h> /* va_list */ |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <getopt.h> /* should be pretty obvious */ |
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|
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#include <sys/stat.h> /* ulimit */ |
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#include <sys/types.h> |
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#include <sys/wait.h> |
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#include <signal.h> |
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/* #include <dmalloc.h> */ |
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#if 1 |
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#include "busybox.h" |
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#include "cmdedit.h" |
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#else |
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#define applet_name "hush" |
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#include "standalone.h" |
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#define hush_main main |
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#undef CONFIG_FEATURE_SH_FANCY_PROMPT |
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#define BB_BANNER |
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#endif |
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#endif |
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#define SPECIAL_VAR_SYMBOL 03 |
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#define SUBSTED_VAR_SYMBOL 04 |
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#ifndef __U_BOOT__ |
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#define FLAG_EXIT_FROM_LOOP 1 |
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#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ |
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#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ |
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#endif |
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#ifdef __U_BOOT__ |
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DECLARE_GLOBAL_DATA_PTR; |
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#define EXIT_SUCCESS 0 |
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#define EOF -1 |
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#define syntax() syntax_err() |
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#define xstrdup strdup |
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#define error_msg printf |
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#else |
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typedef enum { |
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REDIRECT_INPUT = 1, |
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REDIRECT_OVERWRITE = 2, |
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REDIRECT_APPEND = 3, |
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REDIRECT_HEREIS = 4, |
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REDIRECT_IO = 5 |
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} redir_type; |
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|
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/* The descrip member of this structure is only used to make debugging |
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* output pretty */ |
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struct {int mode; int default_fd; char *descrip;} redir_table[] = { |
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{ 0, 0, "()" }, |
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{ O_RDONLY, 0, "<" }, |
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{ O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, |
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{ O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, |
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{ O_RDONLY, -1, "<<" }, |
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{ O_RDWR, 1, "<>" } |
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}; |
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#endif |
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typedef enum { |
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PIPE_SEQ = 1, |
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PIPE_AND = 2, |
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PIPE_OR = 3, |
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PIPE_BG = 4, |
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} pipe_style; |
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|
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/* might eventually control execution */ |
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typedef enum { |
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RES_NONE = 0, |
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RES_IF = 1, |
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RES_THEN = 2, |
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RES_ELIF = 3, |
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RES_ELSE = 4, |
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RES_FI = 5, |
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RES_FOR = 6, |
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RES_WHILE = 7, |
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RES_UNTIL = 8, |
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RES_DO = 9, |
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RES_DONE = 10, |
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RES_XXXX = 11, |
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RES_IN = 12, |
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RES_SNTX = 13 |
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} reserved_style; |
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#define FLAG_END (1<<RES_NONE) |
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#define FLAG_IF (1<<RES_IF) |
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#define FLAG_THEN (1<<RES_THEN) |
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#define FLAG_ELIF (1<<RES_ELIF) |
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#define FLAG_ELSE (1<<RES_ELSE) |
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#define FLAG_FI (1<<RES_FI) |
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#define FLAG_FOR (1<<RES_FOR) |
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#define FLAG_WHILE (1<<RES_WHILE) |
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#define FLAG_UNTIL (1<<RES_UNTIL) |
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#define FLAG_DO (1<<RES_DO) |
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#define FLAG_DONE (1<<RES_DONE) |
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#define FLAG_IN (1<<RES_IN) |
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#define FLAG_START (1<<RES_XXXX) |
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/* This holds pointers to the various results of parsing */ |
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struct p_context { |
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struct child_prog *child; |
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struct pipe *list_head; |
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struct pipe *pipe; |
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#ifndef __U_BOOT__ |
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struct redir_struct *pending_redirect; |
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#endif |
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reserved_style w; |
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int old_flag; /* for figuring out valid reserved words */ |
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struct p_context *stack; |
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int type; /* define type of parser : ";$" common or special symbol */ |
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/* How about quoting status? */ |
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}; |
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#ifndef __U_BOOT__ |
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struct redir_struct { |
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redir_type type; /* type of redirection */ |
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int fd; /* file descriptor being redirected */ |
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int dup; /* -1, or file descriptor being duplicated */ |
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struct redir_struct *next; /* pointer to the next redirect in the list */ |
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glob_t word; /* *word.gl_pathv is the filename */ |
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}; |
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#endif |
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struct child_prog { |
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#ifndef __U_BOOT__ |
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pid_t pid; /* 0 if exited */ |
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#endif |
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char **argv; /* program name and arguments */ |
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/* was quoted when parsed; copy of struct o_string.nonnull field */ |
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int *argv_nonnull; |
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#ifdef __U_BOOT__ |
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int argc; /* number of program arguments */ |
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#endif |
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struct pipe *group; /* if non-NULL, first in group or subshell */ |
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#ifndef __U_BOOT__ |
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int subshell; /* flag, non-zero if group must be forked */ |
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struct redir_struct *redirects; /* I/O redirections */ |
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glob_t glob_result; /* result of parameter globbing */ |
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int is_stopped; /* is the program currently running? */ |
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struct pipe *family; /* pointer back to the child's parent pipe */ |
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#endif |
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int sp; /* number of SPECIAL_VAR_SYMBOL */ |
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int type; |
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}; |
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struct pipe { |
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#ifndef __U_BOOT__ |
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int jobid; /* job number */ |
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#endif |
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int num_progs; /* total number of programs in job */ |
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#ifndef __U_BOOT__ |
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int running_progs; /* number of programs running */ |
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char *text; /* name of job */ |
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char *cmdbuf; /* buffer various argv's point into */ |
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pid_t pgrp; /* process group ID for the job */ |
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#endif |
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struct child_prog *progs; /* array of commands in pipe */ |
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struct pipe *next; /* to track background commands */ |
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#ifndef __U_BOOT__ |
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int stopped_progs; /* number of programs alive, but stopped */ |
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int job_context; /* bitmask defining current context */ |
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#endif |
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pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ |
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reserved_style r_mode; /* supports if, for, while, until */ |
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}; |
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#ifndef __U_BOOT__ |
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struct close_me { |
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int fd; |
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struct close_me *next; |
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}; |
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#endif |
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struct variables { |
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char *name; |
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char *value; |
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int flg_export; |
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int flg_read_only; |
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struct variables *next; |
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}; |
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/* globals, connect us to the outside world |
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* the first three support $?, $#, and $1 */ |
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#ifndef __U_BOOT__ |
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char **global_argv; |
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unsigned int global_argc; |
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#endif |
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static unsigned int last_return_code; |
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#ifndef __U_BOOT__ |
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extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ |
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#endif |
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/* "globals" within this file */ |
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static uchar *ifs; |
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static char map[256]; |
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#ifndef __U_BOOT__ |
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static int fake_mode; |
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static int interactive; |
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static struct close_me *close_me_head; |
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static const char *cwd; |
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static struct pipe *job_list; |
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static unsigned int last_bg_pid; |
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static unsigned int last_jobid; |
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static unsigned int shell_terminal; |
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static char *PS1; |
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static char *PS2; |
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struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; |
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struct variables *top_vars = &shell_ver; |
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#else |
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static int flag_repeat = 0; |
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static int do_repeat = 0; |
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static struct variables *top_vars = NULL ; |
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#endif /*__U_BOOT__ */ |
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#define B_CHUNK (100) |
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#define B_NOSPAC 1 |
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typedef struct { |
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char *data; |
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int length; |
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int maxlen; |
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int quote; |
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int nonnull; |
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} o_string; |
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#define NULL_O_STRING {NULL,0,0,0,0} |
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/* used for initialization: |
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o_string foo = NULL_O_STRING; */ |
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/* I can almost use ordinary FILE *. Is open_memstream() universally |
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* available? Where is it documented? */ |
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struct in_str { |
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const char *p; |
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#ifndef __U_BOOT__ |
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char peek_buf[2]; |
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#endif |
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int __promptme; |
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int promptmode; |
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#ifndef __U_BOOT__ |
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FILE *file; |
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#endif |
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int (*get) (struct in_str *); |
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int (*peek) (struct in_str *); |
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}; |
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#define b_getch(input) ((input)->get(input)) |
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#define b_peek(input) ((input)->peek(input)) |
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#ifndef __U_BOOT__ |
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#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" |
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struct built_in_command { |
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char *cmd; /* name */ |
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char *descr; /* description */ |
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int (*function) (struct child_prog *); /* function ptr */ |
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}; |
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#endif |
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/* define DEBUG_SHELL for debugging output (obviously ;-)) */ |
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#if 0 |
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#define DEBUG_SHELL |
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#endif |
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/* This should be in utility.c */ |
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#ifdef DEBUG_SHELL |
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#ifndef __U_BOOT__ |
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static void debug_printf(const char *format, ...) |
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{ |
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va_list args; |
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va_start(args, format); |
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vfprintf(stderr, format, args); |
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va_end(args); |
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} |
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#else |
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#define debug_printf(fmt,args...) printf (fmt ,##args) |
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#endif |
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#else |
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static inline void debug_printf(const char *format, ...) { } |
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#endif |
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#define final_printf debug_printf |
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#ifdef __U_BOOT__ |
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static void syntax_err(void) { |
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printf("syntax error\n"); |
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} |
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#else |
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static void __syntax(char *file, int line) { |
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error_msg("syntax error %s:%d", file, line); |
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} |
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#define syntax() __syntax(__FILE__, __LINE__) |
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#endif |
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#ifdef __U_BOOT__ |
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static void *xmalloc(size_t size); |
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static void *xrealloc(void *ptr, size_t size); |
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#else |
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/* Index of subroutines: */ |
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/* function prototypes for builtins */ |
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static int builtin_cd(struct child_prog *child); |
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static int builtin_env(struct child_prog *child); |
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static int builtin_eval(struct child_prog *child); |
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static int builtin_exec(struct child_prog *child); |
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static int builtin_exit(struct child_prog *child); |
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static int builtin_export(struct child_prog *child); |
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static int builtin_fg_bg(struct child_prog *child); |
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static int builtin_help(struct child_prog *child); |
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static int builtin_jobs(struct child_prog *child); |
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static int builtin_pwd(struct child_prog *child); |
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static int builtin_read(struct child_prog *child); |
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static int builtin_set(struct child_prog *child); |
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static int builtin_shift(struct child_prog *child); |
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static int builtin_source(struct child_prog *child); |
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static int builtin_umask(struct child_prog *child); |
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static int builtin_unset(struct child_prog *child); |
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static int builtin_not_written(struct child_prog *child); |
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#endif |
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/* o_string manipulation: */ |
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static int b_check_space(o_string *o, int len); |
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static int b_addchr(o_string *o, int ch); |
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static void b_reset(o_string *o); |
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static int b_addqchr(o_string *o, int ch, int quote); |
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#ifndef __U_BOOT__ |
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static int b_adduint(o_string *o, unsigned int i); |
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#endif |
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/* in_str manipulations: */ |
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static int static_get(struct in_str *i); |
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static int static_peek(struct in_str *i); |
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static int file_get(struct in_str *i); |
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static int file_peek(struct in_str *i); |
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#ifndef __U_BOOT__ |
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static void setup_file_in_str(struct in_str *i, FILE *f); |
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#else |
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static void setup_file_in_str(struct in_str *i); |
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#endif |
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static void setup_string_in_str(struct in_str *i, const char *s); |
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#ifndef __U_BOOT__ |
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/* close_me manipulations: */ |
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static void mark_open(int fd); |
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static void mark_closed(int fd); |
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static void close_all(void); |
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#endif |
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/* "run" the final data structures: */ |
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static char *indenter(int i); |
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static int free_pipe_list(struct pipe *head, int indent); |
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static int free_pipe(struct pipe *pi, int indent); |
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/* really run the final data structures: */ |
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#ifndef __U_BOOT__ |
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static int setup_redirects(struct child_prog *prog, int squirrel[]); |
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#endif |
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static int run_list_real(struct pipe *pi); |
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#ifndef __U_BOOT__ |
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static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); |
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#endif |
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static int run_pipe_real(struct pipe *pi); |
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/* extended glob support: */ |
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#ifndef __U_BOOT__ |
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static int globhack(const char *src, int flags, glob_t *pglob); |
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static int glob_needed(const char *s); |
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static int xglob(o_string *dest, int flags, glob_t *pglob); |
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#endif |
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/* variable assignment: */ |
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static int is_assignment(const char *s); |
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/* data structure manipulation: */ |
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#ifndef __U_BOOT__ |
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static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); |
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#endif |
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static void initialize_context(struct p_context *ctx); |
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static int done_word(o_string *dest, struct p_context *ctx); |
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static int done_command(struct p_context *ctx); |
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static int done_pipe(struct p_context *ctx, pipe_style type); |
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/* primary string parsing: */ |
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#ifndef __U_BOOT__ |
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static int redirect_dup_num(struct in_str *input); |
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static int redirect_opt_num(o_string *o); |
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static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); |
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static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); |
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#endif |
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static char *lookup_param(char *src); |
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static char *make_string(char **inp, int *nonnull); |
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static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); |
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#ifndef __U_BOOT__ |
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static int parse_string(o_string *dest, struct p_context *ctx, const char *src); |
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#endif |
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static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); |
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/* setup: */ |
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static int parse_stream_outer(struct in_str *inp, int flag); |
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#ifndef __U_BOOT__ |
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static int parse_string_outer(const char *s, int flag); |
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static int parse_file_outer(FILE *f); |
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#endif |
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#ifndef __U_BOOT__ |
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/* job management: */ |
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static int checkjobs(struct pipe* fg_pipe); |
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static void insert_bg_job(struct pipe *pi); |
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static void remove_bg_job(struct pipe *pi); |
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#endif |
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/* local variable support */ |
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static char **make_list_in(char **inp, char *name); |
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static char *insert_var_value(char *inp); |
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static char *insert_var_value_sub(char *inp, int tag_subst); |
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|
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#ifndef __U_BOOT__ |
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/* Table of built-in functions. They can be forked or not, depending on |
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* context: within pipes, they fork. As simple commands, they do not. |
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* When used in non-forking context, they can change global variables |
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* in the parent shell process. If forked, of course they can not. |
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* For example, 'unset foo | whatever' will parse and run, but foo will |
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* still be set at the end. */ |
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static struct built_in_command bltins[] = { |
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{"bg", "Resume a job in the background", builtin_fg_bg}, |
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{"break", "Exit for, while or until loop", builtin_not_written}, |
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{"cd", "Change working directory", builtin_cd}, |
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{"continue", "Continue for, while or until loop", builtin_not_written}, |
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{"env", "Print all environment variables", builtin_env}, |
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{"eval", "Construct and run shell command", builtin_eval}, |
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{"exec", "Exec command, replacing this shell with the exec'd process", |
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builtin_exec}, |
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{"exit", "Exit from shell()", builtin_exit}, |
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{"export", "Set environment variable", builtin_export}, |
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{"fg", "Bring job into the foreground", builtin_fg_bg}, |
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{"jobs", "Lists the active jobs", builtin_jobs}, |
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{"pwd", "Print current directory", builtin_pwd}, |
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{"read", "Input environment variable", builtin_read}, |
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{"return", "Return from a function", builtin_not_written}, |
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{"set", "Set/unset shell local variables", builtin_set}, |
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{"shift", "Shift positional parameters", builtin_shift}, |
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{"trap", "Trap signals", builtin_not_written}, |
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{"ulimit","Controls resource limits", builtin_not_written}, |
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{"umask","Sets file creation mask", builtin_umask}, |
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{"unset", "Unset environment variable", builtin_unset}, |
|
{".", "Source-in and run commands in a file", builtin_source}, |
|
{"help", "List shell built-in commands", builtin_help}, |
|
{NULL, NULL, NULL} |
|
}; |
|
|
|
static const char *set_cwd(void) |
|
{ |
|
if(cwd==unknown) |
|
cwd = NULL; /* xgetcwd(arg) called free(arg) */ |
|
cwd = xgetcwd((char *)cwd); |
|
if (!cwd) |
|
cwd = unknown; |
|
return cwd; |
|
} |
|
|
|
/* built-in 'eval' handler */ |
|
static int builtin_eval(struct child_prog *child) |
|
{ |
|
char *str = NULL; |
|
int rcode = EXIT_SUCCESS; |
|
|
|
if (child->argv[1]) { |
|
str = make_string(child->argv + 1); |
|
parse_string_outer(str, FLAG_EXIT_FROM_LOOP | |
|
FLAG_PARSE_SEMICOLON); |
|
free(str); |
|
rcode = last_return_code; |
|
} |
|
return rcode; |
|
} |
|
|
|
/* built-in 'cd <path>' handler */ |
|
static int builtin_cd(struct child_prog *child) |
|
{ |
|
char *newdir; |
|
if (child->argv[1] == NULL) |
|
newdir = env_get("HOME"); |
|
else |
|
newdir = child->argv[1]; |
|
if (chdir(newdir)) { |
|
printf("cd: %s: %s\n", newdir, strerror(errno)); |
|
return EXIT_FAILURE; |
|
} |
|
set_cwd(); |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
/* built-in 'env' handler */ |
|
static int builtin_env(struct child_prog *dummy) |
|
{ |
|
char **e = environ; |
|
if (e == NULL) return EXIT_FAILURE; |
|
for (; *e; e++) { |
|
puts(*e); |
|
} |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
/* built-in 'exec' handler */ |
|
static int builtin_exec(struct child_prog *child) |
|
{ |
|
if (child->argv[1] == NULL) |
|
return EXIT_SUCCESS; /* Really? */ |
|
child->argv++; |
|
pseudo_exec(child); |
|
/* never returns */ |
|
} |
|
|
|
/* built-in 'exit' handler */ |
|
static int builtin_exit(struct child_prog *child) |
|
{ |
|
if (child->argv[1] == NULL) |
|
exit(last_return_code); |
|
exit (atoi(child->argv[1])); |
|
} |
|
|
|
/* built-in 'export VAR=value' handler */ |
|
static int builtin_export(struct child_prog *child) |
|
{ |
|
int res = 0; |
|
char *name = child->argv[1]; |
|
|
|
if (name == NULL) { |
|
return (builtin_env(child)); |
|
} |
|
|
|
name = strdup(name); |
|
|
|
if(name) { |
|
char *value = strchr(name, '='); |
|
|
|
if (!value) { |
|
char *tmp; |
|
/* They are exporting something without an =VALUE */ |
|
|
|
value = get_local_var(name); |
|
if (value) { |
|
size_t ln = strlen(name); |
|
|
|
tmp = realloc(name, ln+strlen(value)+2); |
|
if(tmp==NULL) |
|
res = -1; |
|
else { |
|
sprintf(tmp+ln, "=%s", value); |
|
name = tmp; |
|
} |
|
} else { |
|
/* bash does not return an error when trying to export |
|
* an undefined variable. Do likewise. */ |
|
res = 1; |
|
} |
|
} |
|
} |
|
if (res<0) |
|
perror_msg("export"); |
|
else if(res==0) |
|
res = set_local_var(name, 1); |
|
else |
|
res = 0; |
|
free(name); |
|
return res; |
|
} |
|
|
|
/* built-in 'fg' and 'bg' handler */ |
|
static int builtin_fg_bg(struct child_prog *child) |
|
{ |
|
int i, jobnum; |
|
struct pipe *pi=NULL; |
|
|
|
if (!interactive) |
|
return EXIT_FAILURE; |
|
/* If they gave us no args, assume they want the last backgrounded task */ |
|
if (!child->argv[1]) { |
|
for (pi = job_list; pi; pi = pi->next) { |
|
if (pi->jobid == last_jobid) { |
|
break; |
|
} |
|
} |
|
if (!pi) { |
|
error_msg("%s: no current job", child->argv[0]); |
|
return EXIT_FAILURE; |
|
} |
|
} else { |
|
if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { |
|
error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); |
|
return EXIT_FAILURE; |
|
} |
|
for (pi = job_list; pi; pi = pi->next) { |
|
if (pi->jobid == jobnum) { |
|
break; |
|
} |
|
} |
|
if (!pi) { |
|
error_msg("%s: %d: no such job", child->argv[0], jobnum); |
|
return EXIT_FAILURE; |
|
} |
|
} |
|
|
|
if (*child->argv[0] == 'f') { |
|
/* Put the job into the foreground. */ |
|
tcsetpgrp(shell_terminal, pi->pgrp); |
|
} |
|
|
|
/* Restart the processes in the job */ |
|
for (i = 0; i < pi->num_progs; i++) |
|
pi->progs[i].is_stopped = 0; |
|
|
|
if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { |
|
if (i == ESRCH) { |
|
remove_bg_job(pi); |
|
} else { |
|
perror_msg("kill (SIGCONT)"); |
|
} |
|
} |
|
|
|
pi->stopped_progs = 0; |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
/* built-in 'help' handler */ |
|
static int builtin_help(struct child_prog *dummy) |
|
{ |
|
struct built_in_command *x; |
|
|
|
printf("\nBuilt-in commands:\n"); |
|
printf("-------------------\n"); |
|
for (x = bltins; x->cmd; x++) { |
|
if (x->descr==NULL) |
|
continue; |
|
printf("%s\t%s\n", x->cmd, x->descr); |
|
} |
|
printf("\n\n"); |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
/* built-in 'jobs' handler */ |
|
static int builtin_jobs(struct child_prog *child) |
|
{ |
|
struct pipe *job; |
|
char *status_string; |
|
|
|
for (job = job_list; job; job = job->next) { |
|
if (job->running_progs == job->stopped_progs) |
|
status_string = "Stopped"; |
|
else |
|
status_string = "Running"; |
|
|
|
printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); |
|
} |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
|
|
/* built-in 'pwd' handler */ |
|
static int builtin_pwd(struct child_prog *dummy) |
|
{ |
|
puts(set_cwd()); |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
/* built-in 'read VAR' handler */ |
|
static int builtin_read(struct child_prog *child) |
|
{ |
|
int res; |
|
|
|
if (child->argv[1]) { |
|
char string[BUFSIZ]; |
|
char *var = 0; |
|
|
|
string[0] = 0; /* In case stdin has only EOF */ |
|
/* read string */ |
|
fgets(string, sizeof(string), stdin); |
|
chomp(string); |
|
var = malloc(strlen(child->argv[1])+strlen(string)+2); |
|
if(var) { |
|
sprintf(var, "%s=%s", child->argv[1], string); |
|
res = set_local_var(var, 0); |
|
} else |
|
res = -1; |
|
if (res) |
|
fprintf(stderr, "read: %m\n"); |
|
free(var); /* So not move up to avoid breaking errno */ |
|
return res; |
|
} else { |
|
do res=getchar(); while(res!='\n' && res!=EOF); |
|
return 0; |
|
} |
|
} |
|
|
|
/* built-in 'set VAR=value' handler */ |
|
static int builtin_set(struct child_prog *child) |
|
{ |
|
char *temp = child->argv[1]; |
|
struct variables *e; |
|
|
|
if (temp == NULL) |
|
for(e = top_vars; e; e=e->next) |
|
printf("%s=%s\n", e->name, e->value); |
|
else |
|
set_local_var(temp, 0); |
|
|
|
return EXIT_SUCCESS; |
|
} |
|
|
|
|
|
/* Built-in 'shift' handler */ |
|
static int builtin_shift(struct child_prog *child) |
|
{ |
|
int n=1; |
|
if (child->argv[1]) { |
|
n=atoi(child->argv[1]); |
|
} |
|
if (n>=0 && n<global_argc) { |
|
/* XXX This probably breaks $0 */ |
|
global_argc -= n; |
|
global_argv += n; |
|
return EXIT_SUCCESS; |
|
} else { |
|
return EXIT_FAILURE; |
|
} |
|
} |
|
|
|
/* Built-in '.' handler (read-in and execute commands from file) */ |
|
static int builtin_source(struct child_prog *child) |
|
{ |
|
FILE *input; |
|
int status; |
|
|
|
if (child->argv[1] == NULL) |
|
return EXIT_FAILURE; |
|
|
|
/* XXX search through $PATH is missing */ |
|
input = fopen(child->argv[1], "r"); |
|
if (!input) { |
|
error_msg("Couldn't open file '%s'", child->argv[1]); |
|
return EXIT_FAILURE; |
|
} |
|
|
|
/* Now run the file */ |
|
/* XXX argv and argc are broken; need to save old global_argv |
|
* (pointer only is OK!) on this stack frame, |
|
* set global_argv=child->argv+1, recurse, and restore. */ |
|
mark_open(fileno(input)); |
|
status = parse_file_outer(input); |
|
mark_closed(fileno(input)); |
|
fclose(input); |
|
return (status); |
|
} |
|
|
|
static int builtin_umask(struct child_prog *child) |
|
{ |
|
mode_t new_umask; |
|
const char *arg = child->argv[1]; |
|
char *end; |
|
if (arg) { |
|
new_umask=strtoul(arg, &end, 8); |
|
if (*end!='\0' || end == arg) { |
|
return EXIT_FAILURE; |
|
} |
|
} else { |
|
printf("%.3o\n", (unsigned int) (new_umask=umask(0))); |
|
} |
|
umask(new_umask); |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
/* built-in 'unset VAR' handler */ |
|
static int builtin_unset(struct child_prog *child) |
|
{ |
|
/* bash returned already true */ |
|
unset_local_var(child->argv[1]); |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
static int builtin_not_written(struct child_prog *child) |
|
{ |
|
printf("builtin_%s not written\n",child->argv[0]); |
|
return EXIT_FAILURE; |
|
} |
|
#endif |
|
|
|
static int b_check_space(o_string *o, int len) |
|
{ |
|
/* It would be easy to drop a more restrictive policy |
|
* in here, such as setting a maximum string length */ |
|
if (o->length + len > o->maxlen) { |
|
char *old_data = o->data; |
|
/* assert (data == NULL || o->maxlen != 0); */ |
|
o->maxlen += max(2*len, B_CHUNK); |
|
o->data = realloc(o->data, 1 + o->maxlen); |
|
if (o->data == NULL) { |
|
free(old_data); |
|
} |
|
} |
|
return o->data == NULL; |
|
} |
|
|
|
static int b_addchr(o_string *o, int ch) |
|
{ |
|
debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); |
|
if (b_check_space(o, 1)) return B_NOSPAC; |
|
o->data[o->length] = ch; |
|
o->length++; |
|
o->data[o->length] = '\0'; |
|
return 0; |
|
} |
|
|
|
static void b_reset(o_string *o) |
|
{ |
|
o->length = 0; |
|
o->nonnull = 0; |
|
if (o->data != NULL) *o->data = '\0'; |
|
} |
|
|
|
static void b_free(o_string *o) |
|
{ |
|
b_reset(o); |
|
free(o->data); |
|
o->data = NULL; |
|
o->maxlen = 0; |
|
} |
|
|
|
/* My analysis of quoting semantics tells me that state information |
|
* is associated with a destination, not a source. |
|
*/ |
|
static int b_addqchr(o_string *o, int ch, int quote) |
|
{ |
|
if (quote && strchr("*?[\\",ch)) { |
|
int rc; |
|
rc = b_addchr(o, '\\'); |
|
if (rc) return rc; |
|
} |
|
return b_addchr(o, ch); |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
static int b_adduint(o_string *o, unsigned int i) |
|
{ |
|
int r; |
|
char *p = simple_itoa(i); |
|
/* no escape checking necessary */ |
|
do r=b_addchr(o, *p++); while (r==0 && *p); |
|
return r; |
|
} |
|
#endif |
|
|
|
static int static_get(struct in_str *i) |
|
{ |
|
int ch = *i->p++; |
|
if (ch=='\0') return EOF; |
|
return ch; |
|
} |
|
|
|
static int static_peek(struct in_str *i) |
|
{ |
|
return *i->p; |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
static inline void cmdedit_set_initial_prompt(void) |
|
{ |
|
#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT |
|
PS1 = NULL; |
|
#else |
|
PS1 = env_get("PS1"); |
|
if(PS1==0) |
|
PS1 = "\\w \\$ "; |
|
#endif |
|
} |
|
|
|
static inline void setup_prompt_string(int promptmode, char **prompt_str) |
|
{ |
|
debug_printf("setup_prompt_string %d ",promptmode); |
|
#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT |
|
/* Set up the prompt */ |
|
if (promptmode == 1) { |
|
free(PS1); |
|
PS1=xmalloc(strlen(cwd)+4); |
|
sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); |
|
*prompt_str = PS1; |
|
} else { |
|
*prompt_str = PS2; |
|
} |
|
#else |
|
*prompt_str = (promptmode==1)? PS1 : PS2; |
|
#endif |
|
debug_printf("result %s\n",*prompt_str); |
|
} |
|
#endif |
|
|
|
#ifdef __U_BOOT__ |
|
static int uboot_cli_readline(struct in_str *i) |
|
{ |
|
char *prompt; |
|
char __maybe_unused *ps_prompt = NULL; |
|
|
|
if (i->promptmode == 1) |
|
prompt = CONFIG_SYS_PROMPT; |
|
else |
|
prompt = CONFIG_SYS_PROMPT_HUSH_PS2; |
|
|
|
#ifdef CONFIG_CMDLINE_PS_SUPPORT |
|
if (i->promptmode == 1) |
|
ps_prompt = env_get("PS1"); |
|
else |
|
ps_prompt = env_get("PS2"); |
|
if (ps_prompt) |
|
prompt = ps_prompt; |
|
#endif |
|
|
|
return cli_readline(prompt); |
|
} |
|
#endif |
|
|
|
static void get_user_input(struct in_str *i) |
|
{ |
|
#ifndef __U_BOOT__ |
|
char *prompt_str; |
|
static char the_command[BUFSIZ]; |
|
|
|
setup_prompt_string(i->promptmode, &prompt_str); |
|
#ifdef CONFIG_FEATURE_COMMAND_EDITING |
|
/* |
|
** enable command line editing only while a command line |
|
** is actually being read; otherwise, we'll end up bequeathing |
|
** atexit() handlers and other unwanted stuff to our |
|
** child processes ([email protected]) |
|
*/ |
|
cmdedit_read_input(prompt_str, the_command); |
|
#else |
|
fputs(prompt_str, stdout); |
|
fflush(stdout); |
|
the_command[0]=fgetc(i->file); |
|
the_command[1]='\0'; |
|
#endif |
|
fflush(stdout); |
|
i->p = the_command; |
|
#else |
|
int n; |
|
static char the_command[CONFIG_SYS_CBSIZE + 1]; |
|
|
|
bootretry_reset_cmd_timeout(); |
|
i->__promptme = 1; |
|
n = uboot_cli_readline(i); |
|
|
|
#ifdef CONFIG_BOOT_RETRY_TIME |
|
if (n == -2) { |
|
puts("\nTimeout waiting for command\n"); |
|
# ifdef CONFIG_RESET_TO_RETRY |
|
do_reset(NULL, 0, 0, NULL); |
|
# else |
|
# error "This currently only works with CONFIG_RESET_TO_RETRY enabled" |
|
# endif |
|
} |
|
#endif |
|
if (n == -1 ) { |
|
flag_repeat = 0; |
|
i->__promptme = 0; |
|
} |
|
n = strlen(console_buffer); |
|
console_buffer[n] = '\n'; |
|
console_buffer[n+1]= '\0'; |
|
if (had_ctrlc()) flag_repeat = 0; |
|
clear_ctrlc(); |
|
do_repeat = 0; |
|
if (i->promptmode == 1) { |
|
if (console_buffer[0] == '\n'&& flag_repeat == 0) { |
|
strcpy(the_command,console_buffer); |
|
} |
|
else { |
|
if (console_buffer[0] != '\n') { |
|
strcpy(the_command,console_buffer); |
|
flag_repeat = 1; |
|
} |
|
else { |
|
do_repeat = 1; |
|
} |
|
} |
|
i->p = the_command; |
|
} |
|
else { |
|
if (console_buffer[0] != '\n') { |
|
if (strlen(the_command) + strlen(console_buffer) |
|
< CONFIG_SYS_CBSIZE) { |
|
n = strlen(the_command); |
|
the_command[n-1] = ' '; |
|
strcpy(&the_command[n],console_buffer); |
|
} |
|
else { |
|
the_command[0] = '\n'; |
|
the_command[1] = '\0'; |
|
flag_repeat = 0; |
|
} |
|
} |
|
if (i->__promptme == 0) { |
|
the_command[0] = '\n'; |
|
the_command[1] = '\0'; |
|
} |
|
i->p = console_buffer; |
|
} |
|
#endif |
|
} |
|
|
|
/* This is the magic location that prints prompts |
|
* and gets data back from the user */ |
|
static int file_get(struct in_str *i) |
|
{ |
|
int ch; |
|
|
|
ch = 0; |
|
/* If there is data waiting, eat it up */ |
|
if (i->p && *i->p) { |
|
ch = *i->p++; |
|
} else { |
|
/* need to double check i->file because we might be doing something |
|
* more complicated by now, like sourcing or substituting. */ |
|
#ifndef __U_BOOT__ |
|
if (i->__promptme && interactive && i->file == stdin) { |
|
while(! i->p || (interactive && strlen(i->p)==0) ) { |
|
#else |
|
while(! i->p || strlen(i->p)==0 ) { |
|
#endif |
|
get_user_input(i); |
|
} |
|
i->promptmode=2; |
|
#ifndef __U_BOOT__ |
|
i->__promptme = 0; |
|
#endif |
|
if (i->p && *i->p) { |
|
ch = *i->p++; |
|
} |
|
#ifndef __U_BOOT__ |
|
} else { |
|
ch = fgetc(i->file); |
|
} |
|
|
|
#endif |
|
debug_printf("b_getch: got a %d\n", ch); |
|
} |
|
#ifndef __U_BOOT__ |
|
if (ch == '\n') i->__promptme=1; |
|
#endif |
|
return ch; |
|
} |
|
|
|
/* All the callers guarantee this routine will never be |
|
* used right after a newline, so prompting is not needed. |
|
*/ |
|
static int file_peek(struct in_str *i) |
|
{ |
|
#ifndef __U_BOOT__ |
|
if (i->p && *i->p) { |
|
#endif |
|
return *i->p; |
|
#ifndef __U_BOOT__ |
|
} else { |
|
i->peek_buf[0] = fgetc(i->file); |
|
i->peek_buf[1] = '\0'; |
|
i->p = i->peek_buf; |
|
debug_printf("b_peek: got a %d\n", *i->p); |
|
return *i->p; |
|
} |
|
#endif |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
static void setup_file_in_str(struct in_str *i, FILE *f) |
|
#else |
|
static void setup_file_in_str(struct in_str *i) |
|
#endif |
|
{ |
|
i->peek = file_peek; |
|
i->get = file_get; |
|
i->__promptme=1; |
|
i->promptmode=1; |
|
#ifndef __U_BOOT__ |
|
i->file = f; |
|
#endif |
|
i->p = NULL; |
|
} |
|
|
|
static void setup_string_in_str(struct in_str *i, const char *s) |
|
{ |
|
i->peek = static_peek; |
|
i->get = static_get; |
|
i->__promptme=1; |
|
i->promptmode=1; |
|
i->p = s; |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
static void mark_open(int fd) |
|
{ |
|
struct close_me *new = xmalloc(sizeof(struct close_me)); |
|
new->fd = fd; |
|
new->next = close_me_head; |
|
close_me_head = new; |
|
} |
|
|
|
static void mark_closed(int fd) |
|
{ |
|
struct close_me *tmp; |
|
if (close_me_head == NULL || close_me_head->fd != fd) |
|
error_msg_and_die("corrupt close_me"); |
|
tmp = close_me_head; |
|
close_me_head = close_me_head->next; |
|
free(tmp); |
|
} |
|
|
|
static void close_all(void) |
|
{ |
|
struct close_me *c; |
|
for (c=close_me_head; c; c=c->next) { |
|
close(c->fd); |
|
} |
|
close_me_head = NULL; |
|
} |
|
|
|
/* squirrel != NULL means we squirrel away copies of stdin, stdout, |
|
* and stderr if they are redirected. */ |
|
static int setup_redirects(struct child_prog *prog, int squirrel[]) |
|
{ |
|
int openfd, mode; |
|
struct redir_struct *redir; |
|
|
|
for (redir=prog->redirects; redir; redir=redir->next) { |
|
if (redir->dup == -1 && redir->word.gl_pathv == NULL) { |
|
/* something went wrong in the parse. Pretend it didn't happen */ |
|
continue; |
|
} |
|
if (redir->dup == -1) { |
|
mode=redir_table[redir->type].mode; |
|
openfd = open(redir->word.gl_pathv[0], mode, 0666); |
|
if (openfd < 0) { |
|
/* this could get lost if stderr has been redirected, but |
|
bash and ash both lose it as well (though zsh doesn't!) */ |
|
perror_msg("error opening %s", redir->word.gl_pathv[0]); |
|
return 1; |
|
} |
|
} else { |
|
openfd = redir->dup; |
|
} |
|
|
|
if (openfd != redir->fd) { |
|
if (squirrel && redir->fd < 3) { |
|
squirrel[redir->fd] = dup(redir->fd); |
|
} |
|
if (openfd == -3) { |
|
close(openfd); |
|
} else { |
|
dup2(openfd, redir->fd); |
|
if (redir->dup == -1) |
|
close (openfd); |
|
} |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static void restore_redirects(int squirrel[]) |
|
{ |
|
int i, fd; |
|
for (i=0; i<3; i++) { |
|
fd = squirrel[i]; |
|
if (fd != -1) { |
|
/* No error checking. I sure wouldn't know what |
|
* to do with an error if I found one! */ |
|
dup2(fd, i); |
|
close(fd); |
|
} |
|
} |
|
} |
|
|
|
/* never returns */ |
|
/* XXX no exit() here. If you don't exec, use _exit instead. |
|
* The at_exit handlers apparently confuse the calling process, |
|
* in particular stdin handling. Not sure why? */ |
|
static void pseudo_exec(struct child_prog *child) |
|
{ |
|
int i, rcode; |
|
char *p; |
|
struct built_in_command *x; |
|
if (child->argv) { |
|
for (i=0; is_assignment(child->argv[i]); i++) { |
|
debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); |
|
p = insert_var_value(child->argv[i]); |
|
putenv(strdup(p)); |
|
if (p != child->argv[i]) free(p); |
|
} |
|
child->argv+=i; /* XXX this hack isn't so horrible, since we are about |
|
to exit, and therefore don't need to keep data |
|
structures consistent for free() use. */ |
|
/* If a variable is assigned in a forest, and nobody listens, |
|
* was it ever really set? |
|
*/ |
|
if (child->argv[0] == NULL) { |
|
_exit(EXIT_SUCCESS); |
|
} |
|
|
|
/* |
|
* Check if the command matches any of the builtins. |
|
* Depending on context, this might be redundant. But it's |
|
* easier to waste a few CPU cycles than it is to figure out |
|
* if this is one of those cases. |
|
*/ |
|
for (x = bltins; x->cmd; x++) { |
|
if (strcmp(child->argv[0], x->cmd) == 0 ) { |
|
debug_printf("builtin exec %s\n", child->argv[0]); |
|
rcode = x->function(child); |
|
fflush(stdout); |
|
_exit(rcode); |
|
} |
|
} |
|
|
|
/* Check if the command matches any busybox internal commands |
|
* ("applets") here. |
|
* FIXME: This feature is not 100% safe, since |
|
* BusyBox is not fully reentrant, so we have no guarantee the things |
|
* from the .bss are still zeroed, or that things from .data are still |
|
* at their defaults. We could exec ourself from /proc/self/exe, but I |
|
* really dislike relying on /proc for things. We could exec ourself |
|
* from global_argv[0], but if we are in a chroot, we may not be able |
|
* to find ourself... */ |
|
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL |
|
{ |
|
int argc_l; |
|
char** argv_l=child->argv; |
|
char *name = child->argv[0]; |
|
|
|
#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN |
|
/* Following discussions from November 2000 on the busybox mailing |
|
* list, the default configuration, (without |
|
* get_last_path_component()) lets the user force use of an |
|
* external command by specifying the full (with slashes) filename. |
|
* If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets |
|
* _aways_ override external commands, so if you want to run |
|
* /bin/cat, it will use BusyBox cat even if /bin/cat exists on the |
|
* filesystem and is _not_ busybox. Some systems may want this, |
|
* most do not. */ |
|
name = get_last_path_component(name); |
|
#endif |
|
/* Count argc for use in a second... */ |
|
for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); |
|
optind = 1; |
|
debug_printf("running applet %s\n", name); |
|
run_applet_by_name(name, argc_l, child->argv); |
|
} |
|
#endif |
|
debug_printf("exec of %s\n",child->argv[0]); |
|
execvp(child->argv[0],child->argv); |
|
perror_msg("couldn't exec: %s",child->argv[0]); |
|
_exit(1); |
|
} else if (child->group) { |
|
debug_printf("runtime nesting to group\n"); |
|
interactive=0; /* crucial!!!! */ |
|
rcode = run_list_real(child->group); |
|
/* OK to leak memory by not calling free_pipe_list, |
|
* since this process is about to exit */ |
|
_exit(rcode); |
|
} else { |
|
/* Can happen. See what bash does with ">foo" by itself. */ |
|
debug_printf("trying to pseudo_exec null command\n"); |
|
_exit(EXIT_SUCCESS); |
|
} |
|
} |
|
|
|
static void insert_bg_job(struct pipe *pi) |
|
{ |
|
struct pipe *thejob; |
|
|
|
/* Linear search for the ID of the job to use */ |
|
pi->jobid = 1; |
|
for (thejob = job_list; thejob; thejob = thejob->next) |
|
if (thejob->jobid >= pi->jobid) |
|
pi->jobid = thejob->jobid + 1; |
|
|
|
/* add thejob to the list of running jobs */ |
|
if (!job_list) { |
|
thejob = job_list = xmalloc(sizeof(*thejob)); |
|
} else { |
|
for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; |
|
thejob->next = xmalloc(sizeof(*thejob)); |
|
thejob = thejob->next; |
|
} |
|
|
|
/* physically copy the struct job */ |
|
memcpy(thejob, pi, sizeof(struct pipe)); |
|
thejob->next = NULL; |
|
thejob->running_progs = thejob->num_progs; |
|
thejob->stopped_progs = 0; |
|
thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ |
|
|
|
/*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ |
|
{ |
|
char *bar=thejob->text; |
|
char **foo=pi->progs[0].argv; |
|
while(foo && *foo) { |
|
bar += sprintf(bar, "%s ", *foo++); |
|
} |
|
} |
|
|
|
/* we don't wait for background thejobs to return -- append it |
|
to the list of backgrounded thejobs and leave it alone */ |
|
printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); |
|
last_bg_pid = thejob->progs[0].pid; |
|
last_jobid = thejob->jobid; |
|
} |
|
|
|
/* remove a backgrounded job */ |
|
static void remove_bg_job(struct pipe *pi) |
|
{ |
|
struct pipe *prev_pipe; |
|
|
|
if (pi == job_list) { |
|
job_list = pi->next; |
|
} else { |
|
prev_pipe = job_list; |
|
while (prev_pipe->next != pi) |
|
prev_pipe = prev_pipe->next; |
|
prev_pipe->next = pi->next; |
|
} |
|
if (job_list) |
|
last_jobid = job_list->jobid; |
|
else |
|
last_jobid = 0; |
|
|
|
pi->stopped_progs = 0; |
|
free_pipe(pi, 0); |
|
free(pi); |
|
} |
|
|
|
/* Checks to see if any processes have exited -- if they |
|
have, figure out why and see if a job has completed */ |
|
static int checkjobs(struct pipe* fg_pipe) |
|
{ |
|
int attributes; |
|
int status; |
|
int prognum = 0; |
|
struct pipe *pi; |
|
pid_t childpid; |
|
|
|
attributes = WUNTRACED; |
|
if (fg_pipe==NULL) { |
|
attributes |= WNOHANG; |
|
} |
|
|
|
while ((childpid = waitpid(-1, &status, attributes)) > 0) { |
|
if (fg_pipe) { |
|
int i, rcode = 0; |
|
for (i=0; i < fg_pipe->num_progs; i++) { |
|
if (fg_pipe->progs[i].pid == childpid) { |
|
if (i==fg_pipe->num_progs-1) |
|
rcode=WEXITSTATUS(status); |
|
(fg_pipe->num_progs)--; |
|
return(rcode); |
|
} |
|
} |
|
} |
|
|
|
for (pi = job_list; pi; pi = pi->next) { |
|
prognum = 0; |
|
while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { |
|
prognum++; |
|
} |
|
if (prognum < pi->num_progs) |
|
break; |
|
} |
|
|
|
if(pi==NULL) { |
|
debug_printf("checkjobs: pid %d was not in our list!\n", childpid); |
|
continue; |
|
} |
|
|
|
if (WIFEXITED(status) || WIFSIGNALED(status)) { |
|
/* child exited */ |
|
pi->running_progs--; |
|
pi->progs[prognum].pid = 0; |
|
|
|
if (!pi->running_progs) { |
|
printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); |
|
remove_bg_job(pi); |
|
} |
|
} else { |
|
/* child stopped */ |
|
pi->stopped_progs++; |
|
pi->progs[prognum].is_stopped = 1; |
|
|
|
#if 0 |
|
/* Printing this stuff is a pain, since it tends to |
|
* overwrite the prompt an inconveinient moments. So |
|
* don't do that. */ |
|
if (pi->stopped_progs == pi->num_progs) { |
|
printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); |
|
} |
|
#endif |
|
} |
|
} |
|
|
|
if (childpid == -1 && errno != ECHILD) |
|
perror_msg("waitpid"); |
|
|
|
/* move the shell to the foreground */ |
|
/*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ |
|
/* perror_msg("tcsetpgrp-2"); */ |
|
return -1; |
|
} |
|
|
|
/* Figure out our controlling tty, checking in order stderr, |
|
* stdin, and stdout. If check_pgrp is set, also check that |
|
* we belong to the foreground process group associated with |
|
* that tty. The value of shell_terminal is needed in order to call |
|
* tcsetpgrp(shell_terminal, ...); */ |
|
void controlling_tty(int check_pgrp) |
|
{ |
|
pid_t curpgrp; |
|
|
|
if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 |
|
&& (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 |
|
&& (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) |
|
goto shell_terminal_error; |
|
|
|
if (check_pgrp && curpgrp != getpgid(0)) |
|
goto shell_terminal_error; |
|
|
|
return; |
|
|
|
shell_terminal_error: |
|
shell_terminal = -1; |
|
return; |
|
} |
|
#endif |
|
|
|
/* run_pipe_real() starts all the jobs, but doesn't wait for anything |
|
* to finish. See checkjobs(). |
|
* |
|
* return code is normally -1, when the caller has to wait for children |
|
* to finish to determine the exit status of the pipe. If the pipe |
|
* is a simple builtin command, however, the action is done by the |
|
* time run_pipe_real returns, and the exit code is provided as the |
|
* return value. |
|
* |
|
* The input of the pipe is always stdin, the output is always |
|
* stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, |
|
* because it tries to avoid running the command substitution in |
|
* subshell, when that is in fact necessary. The subshell process |
|
* now has its stdout directed to the input of the appropriate pipe, |
|
* so this routine is noticeably simpler. |
|
*/ |
|
static int run_pipe_real(struct pipe *pi) |
|
{ |
|
int i; |
|
#ifndef __U_BOOT__ |
|
int nextin, nextout; |
|
int pipefds[2]; /* pipefds[0] is for reading */ |
|
struct child_prog *child; |
|
struct built_in_command *x; |
|
char *p; |
|
# if __GNUC__ |
|
/* Avoid longjmp clobbering */ |
|
(void) &i; |
|
(void) &nextin; |
|
(void) &nextout; |
|
(void) &child; |
|
# endif |
|
#else |
|
int nextin; |
|
int flag = do_repeat ? CMD_FLAG_REPEAT : 0; |
|
struct child_prog *child; |
|
char *p; |
|
# if __GNUC__ |
|
/* Avoid longjmp clobbering */ |
|
(void) &i; |
|
(void) &nextin; |
|
(void) &child; |
|
# endif |
|
#endif /* __U_BOOT__ */ |
|
|
|
nextin = 0; |
|
#ifndef __U_BOOT__ |
|
pi->pgrp = -1; |
|
#endif |
|
|
|
/* Check if this is a simple builtin (not part of a pipe). |
|
* Builtins within pipes have to fork anyway, and are handled in |
|
* pseudo_exec. "echo foo | read bar" doesn't work on bash, either. |
|
*/ |
|
if (pi->num_progs == 1) child = & (pi->progs[0]); |
|
#ifndef __U_BOOT__ |
|
if (pi->num_progs == 1 && child->group && child->subshell == 0) { |
|
int squirrel[] = {-1, -1, -1}; |
|
int rcode; |
|
debug_printf("non-subshell grouping\n"); |
|
setup_redirects(child, squirrel); |
|
/* XXX could we merge code with following builtin case, |
|
* by creating a pseudo builtin that calls run_list_real? */ |
|
rcode = run_list_real(child->group); |
|
restore_redirects(squirrel); |
|
#else |
|
if (pi->num_progs == 1 && child->group) { |
|
int rcode; |
|
debug_printf("non-subshell grouping\n"); |
|
rcode = run_list_real(child->group); |
|
#endif |
|
return rcode; |
|
} else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { |
|
for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } |
|
if (i!=0 && child->argv[i]==NULL) { |
|
/* assignments, but no command: set the local environment */ |
|
for (i=0; child->argv[i]!=NULL; i++) { |
|
|
|
/* Ok, this case is tricky. We have to decide if this is a |
|
* local variable, or an already exported variable. If it is |
|
* already exported, we have to export the new value. If it is |
|
* not exported, we need only set this as a local variable. |
|
* This junk is all to decide whether or not to export this |
|
* variable. */ |
|
int export_me=0; |
|
char *name, *value; |
|
name = xstrdup(child->argv[i]); |
|
debug_printf("Local environment set: %s\n", name); |
|
value = strchr(name, '='); |
|
if (value) |
|
*value=0; |
|
#ifndef __U_BOOT__ |
|
if ( get_local_var(name)) { |
|
export_me=1; |
|
} |
|
#endif |
|
free(name); |
|
p = insert_var_value(child->argv[i]); |
|
set_local_var(p, export_me); |
|
if (p != child->argv[i]) free(p); |
|
} |
|
return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ |
|
} |
|
for (i = 0; is_assignment(child->argv[i]); i++) { |
|
p = insert_var_value(child->argv[i]); |
|
#ifndef __U_BOOT__ |
|
putenv(strdup(p)); |
|
#else |
|
set_local_var(p, 0); |
|
#endif |
|
if (p != child->argv[i]) { |
|
child->sp--; |
|
free(p); |
|
} |
|
} |
|
if (child->sp) { |
|
char * str = NULL; |
|
|
|
str = make_string(child->argv + i, |
|
child->argv_nonnull + i); |
|
parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); |
|
free(str); |
|
return last_return_code; |
|
} |
|
#ifndef __U_BOOT__ |
|
for (x = bltins; x->cmd; x++) { |
|
if (strcmp(child->argv[i], x->cmd) == 0 ) { |
|
int squirrel[] = {-1, -1, -1}; |
|
int rcode; |
|
if (x->function == builtin_exec && child->argv[i+1]==NULL) { |
|
debug_printf("magic exec\n"); |
|
setup_redirects(child,NULL); |
|
return EXIT_SUCCESS; |
|
} |
|
debug_printf("builtin inline %s\n", child->argv[0]); |
|
/* XXX setup_redirects acts on file descriptors, not FILEs. |
|
* This is perfect for work that comes after exec(). |
|
* Is it really safe for inline use? Experimentally, |
|
* things seem to work with glibc. */ |
|
setup_redirects(child, squirrel); |
|
|
|
child->argv += i; /* XXX horrible hack */ |
|
rcode = x->function(child); |
|
/* XXX restore hack so free() can work right */ |
|
child->argv -= i; |
|
restore_redirects(squirrel); |
|
} |
|
return rcode; |
|
} |
|
#else |
|
/* check ";", because ,example , argv consist from |
|
* "help;flinfo" must not execute |
|
*/ |
|
if (strchr(child->argv[i], ';')) { |
|
printf("Unknown command '%s' - try 'help' or use " |
|
"'run' command\n", child->argv[i]); |
|
return -1; |
|
} |
|
/* Process the command */ |
|
return cmd_process(flag, child->argc, child->argv, |
|
&flag_repeat, NULL); |
|
#endif |
|
} |
|
#ifndef __U_BOOT__ |
|
|
|
for (i = 0; i < pi->num_progs; i++) { |
|
child = & (pi->progs[i]); |
|
|
|
/* pipes are inserted between pairs of commands */ |
|
if ((i + 1) < pi->num_progs) { |
|
if (pipe(pipefds)<0) perror_msg_and_die("pipe"); |
|
nextout = pipefds[1]; |
|
} else { |
|
nextout=1; |
|
pipefds[0] = -1; |
|
} |
|
|
|
/* XXX test for failed fork()? */ |
|
if (!(child->pid = fork())) { |
|
/* Set the handling for job control signals back to the default. */ |
|
signal(SIGINT, SIG_DFL); |
|
signal(SIGQUIT, SIG_DFL); |
|
signal(SIGTERM, SIG_DFL); |
|
signal(SIGTSTP, SIG_DFL); |
|
signal(SIGTTIN, SIG_DFL); |
|
signal(SIGTTOU, SIG_DFL); |
|
signal(SIGCHLD, SIG_DFL); |
|
|
|
close_all(); |
|
|
|
if (nextin != 0) { |
|
dup2(nextin, 0); |
|
close(nextin); |
|
} |
|
if (nextout != 1) { |
|
dup2(nextout, 1); |
|
close(nextout); |
|
} |
|
if (pipefds[0]!=-1) { |
|
close(pipefds[0]); /* opposite end of our output pipe */ |
|
} |
|
|
|
/* Like bash, explicit redirects override pipes, |
|
* and the pipe fd is available for dup'ing. */ |
|
setup_redirects(child,NULL); |
|
|
|
if (interactive && pi->followup!=PIPE_BG) { |
|
/* If we (the child) win the race, put ourselves in the process |
|
* group whose leader is the first process in this pipe. */ |
|
if (pi->pgrp < 0) { |
|
pi->pgrp = getpid(); |
|
} |
|
if (setpgid(0, pi->pgrp) == 0) { |
|
tcsetpgrp(2, pi->pgrp); |
|
} |
|
} |
|
|
|
pseudo_exec(child); |
|
} |
|
|
|
|
|
/* put our child in the process group whose leader is the |
|
first process in this pipe */ |
|
if (pi->pgrp < 0) { |
|
pi->pgrp = child->pid; |
|
} |
|
/* Don't check for errors. The child may be dead already, |
|
* in which case setpgid returns error code EACCES. */ |
|
setpgid(child->pid, pi->pgrp); |
|
|
|
if (nextin != 0) |
|
close(nextin); |
|
if (nextout != 1) |
|
close(nextout); |
|
|
|
/* If there isn't another process, nextin is garbage |
|
but it doesn't matter */ |
|
nextin = pipefds[0]; |
|
} |
|
#endif |
|
return -1; |
|
} |
|
|
|
static int run_list_real(struct pipe *pi) |
|
{ |
|
char *save_name = NULL; |
|
char **list = NULL; |
|
char **save_list = NULL; |
|
struct pipe *rpipe; |
|
int flag_rep = 0; |
|
#ifndef __U_BOOT__ |
|
int save_num_progs; |
|
#endif |
|
int rcode=0, flag_skip=1; |
|
int flag_restore = 0; |
|
int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ |
|
reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; |
|
/* check syntax for "for" */ |
|
for (rpipe = pi; rpipe; rpipe = rpipe->next) { |
|
if ((rpipe->r_mode == RES_IN || |
|
rpipe->r_mode == RES_FOR) && |
|
(rpipe->next == NULL)) { |
|
syntax(); |
|
#ifdef __U_BOOT__ |
|
flag_repeat = 0; |
|
#endif |
|
return 1; |
|
} |
|
if ((rpipe->r_mode == RES_IN && |
|
(rpipe->next->r_mode == RES_IN && |
|
rpipe->next->progs->argv != NULL))|| |
|
(rpipe->r_mode == RES_FOR && |
|
rpipe->next->r_mode != RES_IN)) { |
|
syntax(); |
|
#ifdef __U_BOOT__ |
|
flag_repeat = 0; |
|
#endif |
|
return 1; |
|
} |
|
} |
|
for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { |
|
if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || |
|
pi->r_mode == RES_FOR) { |
|
#ifdef __U_BOOT__ |
|
/* check Ctrl-C */ |
|
ctrlc(); |
|
if ((had_ctrlc())) { |
|
return 1; |
|
} |
|
#endif |
|
flag_restore = 0; |
|
if (!rpipe) { |
|
flag_rep = 0; |
|
rpipe = pi; |
|
} |
|
} |
|
rmode = pi->r_mode; |
|
debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode); |
|
if (rmode == skip_more_in_this_rmode && flag_skip) { |
|
if (pi->followup == PIPE_SEQ) flag_skip=0; |
|
continue; |
|
} |
|
flag_skip = 1; |
|
skip_more_in_this_rmode = RES_XXXX; |
|
if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; |
|
if (rmode == RES_THEN && if_code) continue; |
|
if (rmode == RES_ELSE && !if_code) continue; |
|
if (rmode == RES_ELIF && !if_code) break; |
|
if (rmode == RES_FOR && pi->num_progs) { |
|
if (!list) { |
|
/* if no variable values after "in" we skip "for" */ |
|
if (!pi->next->progs->argv) continue; |
|
/* create list of variable values */ |
|
list = make_list_in(pi->next->progs->argv, |
|
pi->progs->argv[0]); |
|
save_list = list; |
|
save_name = pi->progs->argv[0]; |
|
pi->progs->argv[0] = NULL; |
|
flag_rep = 1; |
|
} |
|
if (!(*list)) { |
|
free(pi->progs->argv[0]); |
|
free(save_list); |
|
list = NULL; |
|
flag_rep = 0; |
|
pi->progs->argv[0] = save_name; |
|
#ifndef __U_BOOT__ |
|
pi->progs->glob_result.gl_pathv[0] = |
|
pi->progs->argv[0]; |
|
#endif |
|
continue; |
|
} else { |
|
/* insert new value from list for variable */ |
|
if (pi->progs->argv[0]) |
|
free(pi->progs->argv[0]); |
|
pi->progs->argv[0] = *list++; |
|
#ifndef __U_BOOT__ |
|
pi->progs->glob_result.gl_pathv[0] = |
|
pi->progs->argv[0]; |
|
#endif |
|
} |
|
} |
|
if (rmode == RES_IN) continue; |
|
if (rmode == RES_DO) { |
|
if (!flag_rep) continue; |
|
} |
|
if (rmode == RES_DONE) { |
|
if (flag_rep) { |
|
flag_restore = 1; |
|
} else { |
|
rpipe = NULL; |
|
} |
|
} |
|
if (pi->num_progs == 0) continue; |
|
#ifndef __U_BOOT__ |
|
save_num_progs = pi->num_progs; /* save number of programs */ |
|
#endif |
|
rcode = run_pipe_real(pi); |
|
debug_printf("run_pipe_real returned %d\n",rcode); |
|
#ifndef __U_BOOT__ |
|
if (rcode!=-1) { |
|
/* We only ran a builtin: rcode was set by the return value |
|
* of run_pipe_real(), and we don't need to wait for anything. */ |
|
} else if (pi->followup==PIPE_BG) { |
|
/* XXX check bash's behavior with nontrivial pipes */ |
|
/* XXX compute jobid */ |
|
/* XXX what does bash do with attempts to background builtins? */ |
|
insert_bg_job(pi); |
|
rcode = EXIT_SUCCESS; |
|
} else { |
|
if (interactive) { |
|
/* move the new process group into the foreground */ |
|
if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) |
|
perror_msg("tcsetpgrp-3"); |
|
rcode = checkjobs(pi); |
|
/* move the shell to the foreground */ |
|
if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) |
|
perror_msg("tcsetpgrp-4"); |
|
} else { |
|
rcode = checkjobs(pi); |
|
} |
|
debug_printf("checkjobs returned %d\n",rcode); |
|
} |
|
last_return_code=rcode; |
|
#else |
|
if (rcode < -1) { |
|
last_return_code = -rcode - 2; |
|
return -2; /* exit */ |
|
} |
|
last_return_code=(rcode == 0) ? 0 : 1; |
|
#endif |
|
#ifndef __U_BOOT__ |
|
pi->num_progs = save_num_progs; /* restore number of programs */ |
|
#endif |
|
if ( rmode == RES_IF || rmode == RES_ELIF ) |
|
next_if_code=rcode; /* can be overwritten a number of times */ |
|
if (rmode == RES_WHILE) |
|
flag_rep = !last_return_code; |
|
if (rmode == RES_UNTIL) |
|
flag_rep = last_return_code; |
|
if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || |
|
(rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) |
|
skip_more_in_this_rmode=rmode; |
|
#ifndef __U_BOOT__ |
|
checkjobs(NULL); |
|
#endif |
|
} |
|
return rcode; |
|
} |
|
|
|
/* broken, of course, but OK for testing */ |
|
static char *indenter(int i) |
|
{ |
|
static char blanks[]=" "; |
|
return &blanks[sizeof(blanks)-i-1]; |
|
} |
|
|
|
/* return code is the exit status of the pipe */ |
|
static int free_pipe(struct pipe *pi, int indent) |
|
{ |
|
char **p; |
|
struct child_prog *child; |
|
#ifndef __U_BOOT__ |
|
struct redir_struct *r, *rnext; |
|
#endif |
|
int a, i, ret_code=0; |
|
char *ind = indenter(indent); |
|
|
|
#ifndef __U_BOOT__ |
|
if (pi->stopped_progs > 0) |
|
return ret_code; |
|
final_printf("%s run pipe: (pid %d)\n",ind,getpid()); |
|
#endif |
|
for (i=0; i<pi->num_progs; i++) { |
|
child = &pi->progs[i]; |
|
final_printf("%s command %d:\n",ind,i); |
|
if (child->argv) { |
|
for (a=0,p=child->argv; *p; a++,p++) { |
|
final_printf("%s argv[%d] = %s\n",ind,a,*p); |
|
} |
|
#ifndef __U_BOOT__ |
|
globfree(&child->glob_result); |
|
#else |
|
for (a = 0; a < child->argc; a++) { |
|
free(child->argv[a]); |
|
} |
|
free(child->argv); |
|
free(child->argv_nonnull); |
|
child->argc = 0; |
|
#endif |
|
child->argv=NULL; |
|
} else if (child->group) { |
|
#ifndef __U_BOOT__ |
|
final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); |
|
#endif |
|
ret_code = free_pipe_list(child->group,indent+3); |
|
final_printf("%s end group\n",ind); |
|
} else { |
|
final_printf("%s (nil)\n",ind); |
|
} |
|
#ifndef __U_BOOT__ |
|
for (r=child->redirects; r; r=rnext) { |
|
final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); |
|
if (r->dup == -1) { |
|
/* guard against the case >$FOO, where foo is unset or blank */ |
|
if (r->word.gl_pathv) { |
|
final_printf(" %s\n", *r->word.gl_pathv); |
|
globfree(&r->word); |
|
} |
|
} else { |
|
final_printf("&%d\n", r->dup); |
|
} |
|
rnext=r->next; |
|
free(r); |
|
} |
|
child->redirects=NULL; |
|
#endif |
|
} |
|
free(pi->progs); /* children are an array, they get freed all at once */ |
|
pi->progs=NULL; |
|
return ret_code; |
|
} |
|
|
|
static int free_pipe_list(struct pipe *head, int indent) |
|
{ |
|
int rcode=0; /* if list has no members */ |
|
struct pipe *pi, *next; |
|
char *ind = indenter(indent); |
|
for (pi=head; pi; pi=next) { |
|
final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); |
|
rcode = free_pipe(pi, indent); |
|
final_printf("%s pipe followup code %d\n", ind, pi->followup); |
|
next=pi->next; |
|
pi->next=NULL; |
|
free(pi); |
|
} |
|
return rcode; |
|
} |
|
|
|
/* Select which version we will use */ |
|
static int run_list(struct pipe *pi) |
|
{ |
|
int rcode=0; |
|
#ifndef __U_BOOT__ |
|
if (fake_mode==0) { |
|
#endif |
|
rcode = run_list_real(pi); |
|
#ifndef __U_BOOT__ |
|
} |
|
#endif |
|
/* free_pipe_list has the side effect of clearing memory |
|
* In the long run that function can be merged with run_list_real, |
|
* but doing that now would hobble the debugging effort. */ |
|
free_pipe_list(pi,0); |
|
return rcode; |
|
} |
|
|
|
/* The API for glob is arguably broken. This routine pushes a non-matching |
|
* string into the output structure, removing non-backslashed backslashes. |
|
* If someone can prove me wrong, by performing this function within the |
|
* original glob(3) api, feel free to rewrite this routine into oblivion. |
|
* Return code (0 vs. GLOB_NOSPACE) matches glob(3). |
|
* XXX broken if the last character is '\\', check that before calling. |
|
*/ |
|
#ifndef __U_BOOT__ |
|
static int globhack(const char *src, int flags, glob_t *pglob) |
|
{ |
|
int cnt=0, pathc; |
|
const char *s; |
|
char *dest; |
|
for (cnt=1, s=src; s && *s; s++) { |
|
if (*s == '\\') s++; |
|
cnt++; |
|
} |
|
dest = malloc(cnt); |
|
if (!dest) return GLOB_NOSPACE; |
|
if (!(flags & GLOB_APPEND)) { |
|
pglob->gl_pathv=NULL; |
|
pglob->gl_pathc=0; |
|
pglob->gl_offs=0; |
|
pglob->gl_offs=0; |
|
} |
|
pathc = ++pglob->gl_pathc; |
|
pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); |
|
if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; |
|
pglob->gl_pathv[pathc-1]=dest; |
|
pglob->gl_pathv[pathc]=NULL; |
|
for (s=src; s && *s; s++, dest++) { |
|
if (*s == '\\') s++; |
|
*dest = *s; |
|
} |
|
*dest='\0'; |
|
return 0; |
|
} |
|
|
|
/* XXX broken if the last character is '\\', check that before calling */ |
|
static int glob_needed(const char *s) |
|
{ |
|
for (; *s; s++) { |
|
if (*s == '\\') s++; |
|
if (strchr("*[?",*s)) return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
#if 0 |
|
static void globprint(glob_t *pglob) |
|
{ |
|
int i; |
|
debug_printf("glob_t at %p:\n", pglob); |
|
debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", |
|
pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); |
|
for (i=0; i<pglob->gl_pathc; i++) |
|
debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, |
|
pglob->gl_pathv[i], pglob->gl_pathv[i]); |
|
} |
|
#endif |
|
|
|
static int xglob(o_string *dest, int flags, glob_t *pglob) |
|
{ |
|
int gr; |
|
|
|
/* short-circuit for null word */ |
|
/* we can code this better when the debug_printf's are gone */ |
|
if (dest->length == 0) { |
|
if (dest->nonnull) { |
|
/* bash man page calls this an "explicit" null */ |
|
gr = globhack(dest->data, flags, pglob); |
|
debug_printf("globhack returned %d\n",gr); |
|
} else { |
|
return 0; |
|
} |
|
} else if (glob_needed(dest->data)) { |
|
gr = glob(dest->data, flags, NULL, pglob); |
|
debug_printf("glob returned %d\n",gr); |
|
if (gr == GLOB_NOMATCH) { |
|
/* quote removal, or more accurately, backslash removal */ |
|
gr = globhack(dest->data, flags, pglob); |
|
debug_printf("globhack returned %d\n",gr); |
|
} |
|
} else { |
|
gr = globhack(dest->data, flags, pglob); |
|
debug_printf("globhack returned %d\n",gr); |
|
} |
|
if (gr == GLOB_NOSPACE) |
|
error_msg_and_die("out of memory during glob"); |
|
if (gr != 0) { /* GLOB_ABORTED ? */ |
|
error_msg("glob(3) error %d",gr); |
|
} |
|
/* globprint(glob_target); */ |
|
return gr; |
|
} |
|
#endif |
|
|
|
#ifdef __U_BOOT__ |
|
static char *get_dollar_var(char ch); |
|
#endif |
|
|
|
/* This is used to get/check local shell variables */ |
|
char *get_local_var(const char *s) |
|
{ |
|
struct variables *cur; |
|
|
|
if (!s) |
|
return NULL; |
|
|
|
#ifdef __U_BOOT__ |
|
if (*s == '$') |
|
return get_dollar_var(s[1]); |
|
#endif |
|
|
|
for (cur = top_vars; cur; cur=cur->next) |
|
if(strcmp(cur->name, s)==0) |
|
return cur->value; |
|
return NULL; |
|
} |
|
|
|
/* This is used to set local shell variables |
|
flg_export==0 if only local (not exporting) variable |
|
flg_export==1 if "new" exporting environ |
|
flg_export>1 if current startup environ (not call putenv()) */ |
|
int set_local_var(const char *s, int flg_export) |
|
{ |
|
char *name, *value; |
|
int result=0; |
|
struct variables *cur; |
|
|
|
#ifdef __U_BOOT__ |
|
/* might be possible! */ |
|
if (!isalpha(*s)) |
|
return -1; |
|
#endif |
|
|
|
name=strdup(s); |
|
|
|
#ifdef __U_BOOT__ |
|
if (env_get(name) != NULL) { |
|
printf ("ERROR: " |
|
"There is a global environment variable with the same name.\n"); |
|
free(name); |
|
return -1; |
|
} |
|
#endif |
|
/* Assume when we enter this function that we are already in |
|
* NAME=VALUE format. So the first order of business is to |
|
* split 's' on the '=' into 'name' and 'value' */ |
|
value = strchr(name, '='); |
|
if (value == NULL || *(value + 1) == 0) { |
|
free(name); |
|
return -1; |
|
} |
|
*value++ = 0; |
|
|
|
for(cur = top_vars; cur; cur = cur->next) { |
|
if(strcmp(cur->name, name)==0) |
|
break; |
|
} |
|
|
|
if(cur) { |
|
if(strcmp(cur->value, value)==0) { |
|
if(flg_export>0 && cur->flg_export==0) |
|
cur->flg_export=flg_export; |
|
else |
|
result++; |
|
} else { |
|
if(cur->flg_read_only) { |
|
error_msg("%s: readonly variable", name); |
|
result = -1; |
|
} else { |
|
if(flg_export>0 || cur->flg_export>1) |
|
cur->flg_export=1; |
|
free(cur->value); |
|
|
|
cur->value = strdup(value); |
|
} |
|
} |
|
} else { |
|
cur = malloc(sizeof(struct variables)); |
|
if(!cur) { |
|
result = -1; |
|
} else { |
|
cur->name = strdup(name); |
|
if (cur->name == NULL) { |
|
free(cur); |
|
result = -1; |
|
} else { |
|
struct variables *bottom = top_vars; |
|
cur->value = strdup(value); |
|
cur->next = NULL; |
|
cur->flg_export = flg_export; |
|
cur->flg_read_only = 0; |
|
while(bottom->next) bottom=bottom->next; |
|
bottom->next = cur; |
|
} |
|
} |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
if(result==0 && cur->flg_export==1) { |
|
*(value-1) = '='; |
|
result = putenv(name); |
|
} else { |
|
#endif |
|
free(name); |
|
#ifndef __U_BOOT__ |
|
if(result>0) /* equivalent to previous set */ |
|
result = 0; |
|
} |
|
#endif |
|
return result; |
|
} |
|
|
|
void unset_local_var(const char *name) |
|
{ |
|
struct variables *cur; |
|
|
|
if (name) { |
|
for (cur = top_vars; cur; cur=cur->next) { |
|
if(strcmp(cur->name, name)==0) |
|
break; |
|
} |
|
if (cur != NULL) { |
|
struct variables *next = top_vars; |
|
if(cur->flg_read_only) { |
|
error_msg("%s: readonly variable", name); |
|
return; |
|
} else { |
|
#ifndef __U_BOOT__ |
|
if(cur->flg_export) |
|
unenv_set(cur->name); |
|
#endif |
|
free(cur->name); |
|
free(cur->value); |
|
while (next->next != cur) |
|
next = next->next; |
|
next->next = cur->next; |
|
} |
|
free(cur); |
|
} |
|
} |
|
} |
|
|
|
static int is_assignment(const char *s) |
|
{ |
|
if (s == NULL) |
|
return 0; |
|
|
|
if (!isalpha(*s)) return 0; |
|
++s; |
|
while(isalnum(*s) || *s=='_') ++s; |
|
return *s=='='; |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
/* the src parameter allows us to peek forward to a possible &n syntax |
|
* for file descriptor duplication, e.g., "2>&1". |
|
* Return code is 0 normally, 1 if a syntax error is detected in src. |
|
* Resource errors (in xmalloc) cause the process to exit */ |
|
static int setup_redirect(struct p_context *ctx, int fd, redir_type style, |
|
struct in_str *input) |
|
{ |
|
struct child_prog *child=ctx->child; |
|
struct redir_struct *redir = child->redirects; |
|
struct redir_struct *last_redir=NULL; |
|
|
|
/* Create a new redir_struct and drop it onto the end of the linked list */ |
|
while(redir) { |
|
last_redir=redir; |
|
redir=redir->next; |
|
} |
|
redir = xmalloc(sizeof(struct redir_struct)); |
|
redir->next=NULL; |
|
redir->word.gl_pathv=NULL; |
|
if (last_redir) { |
|
last_redir->next=redir; |
|
} else { |
|
child->redirects=redir; |
|
} |
|
|
|
redir->type=style; |
|
redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; |
|
|
|
debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); |
|
|
|
/* Check for a '2>&1' type redirect */ |
|
redir->dup = redirect_dup_num(input); |
|
if (redir->dup == -2) return 1; /* syntax error */ |
|
if (redir->dup != -1) { |
|
/* Erik had a check here that the file descriptor in question |
|
* is legit; I postpone that to "run time" |
|
* A "-" representation of "close me" shows up as a -3 here */ |
|
debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); |
|
} else { |
|
/* We do _not_ try to open the file that src points to, |
|
* since we need to return and let src be expanded first. |
|
* Set ctx->pending_redirect, so we know what to do at the |
|
* end of the next parsed word. |
|
*/ |
|
ctx->pending_redirect = redir; |
|
} |
|
return 0; |
|
} |
|
#endif |
|
|
|
static struct pipe *new_pipe(void) |
|
{ |
|
struct pipe *pi; |
|
pi = xmalloc(sizeof(struct pipe)); |
|
pi->num_progs = 0; |
|
pi->progs = NULL; |
|
pi->next = NULL; |
|
pi->followup = 0; /* invalid */ |
|
pi->r_mode = RES_NONE; |
|
return pi; |
|
} |
|
|
|
static void initialize_context(struct p_context *ctx) |
|
{ |
|
ctx->pipe=NULL; |
|
#ifndef __U_BOOT__ |
|
ctx->pending_redirect=NULL; |
|
#endif |
|
ctx->child=NULL; |
|
ctx->list_head=new_pipe(); |
|
ctx->pipe=ctx->list_head; |
|
ctx->w=RES_NONE; |
|
ctx->stack=NULL; |
|
#ifdef __U_BOOT__ |
|
ctx->old_flag=0; |
|
#endif |
|
done_command(ctx); /* creates the memory for working child */ |
|
} |
|
|
|
/* normal return is 0 |
|
* if a reserved word is found, and processed, return 1 |
|
* should handle if, then, elif, else, fi, for, while, until, do, done. |
|
* case, function, and select are obnoxious, save those for later. |
|
*/ |
|
struct reserved_combo { |
|
char *literal; |
|
int code; |
|
long flag; |
|
}; |
|
/* Mostly a list of accepted follow-up reserved words. |
|
* FLAG_END means we are done with the sequence, and are ready |
|
* to turn the compound list into a command. |
|
* FLAG_START means the word must start a new compound list. |
|
*/ |
|
static struct reserved_combo reserved_list[] = { |
|
{ "if", RES_IF, FLAG_THEN | FLAG_START }, |
|
{ "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, |
|
{ "elif", RES_ELIF, FLAG_THEN }, |
|
{ "else", RES_ELSE, FLAG_FI }, |
|
{ "fi", RES_FI, FLAG_END }, |
|
{ "for", RES_FOR, FLAG_IN | FLAG_START }, |
|
{ "while", RES_WHILE, FLAG_DO | FLAG_START }, |
|
{ "until", RES_UNTIL, FLAG_DO | FLAG_START }, |
|
{ "in", RES_IN, FLAG_DO }, |
|
{ "do", RES_DO, FLAG_DONE }, |
|
{ "done", RES_DONE, FLAG_END } |
|
}; |
|
#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) |
|
|
|
static int reserved_word(o_string *dest, struct p_context *ctx) |
|
{ |
|
struct reserved_combo *r; |
|
for (r=reserved_list; |
|
r<reserved_list+NRES; r++) { |
|
if (strcmp(dest->data, r->literal) == 0) { |
|
debug_printf("found reserved word %s, code %d\n",r->literal,r->code); |
|
if (r->flag & FLAG_START) { |
|
struct p_context *new = xmalloc(sizeof(struct p_context)); |
|
debug_printf("push stack\n"); |
|
if (ctx->w == RES_IN || ctx->w == RES_FOR) { |
|
syntax(); |
|
free(new); |
|
ctx->w = RES_SNTX; |
|
b_reset(dest); |
|
return 1; |
|
} |
|
*new = *ctx; /* physical copy */ |
|
initialize_context(ctx); |
|
ctx->stack=new; |
|
} else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { |
|
syntax(); |
|
ctx->w = RES_SNTX; |
|
b_reset(dest); |
|
return 1; |
|
} |
|
ctx->w=r->code; |
|
ctx->old_flag = r->flag; |
|
if (ctx->old_flag & FLAG_END) { |
|
struct p_context *old; |
|
debug_printf("pop stack\n"); |
|
done_pipe(ctx,PIPE_SEQ); |
|
old = ctx->stack; |
|
old->child->group = ctx->list_head; |
|
#ifndef __U_BOOT__ |
|
old->child->subshell = 0; |
|
#endif |
|
*ctx = *old; /* physical copy */ |
|
free(old); |
|
} |
|
b_reset (dest); |
|
return 1; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
/* normal return is 0. |
|
* Syntax or xglob errors return 1. */ |
|
static int done_word(o_string *dest, struct p_context *ctx) |
|
{ |
|
struct child_prog *child=ctx->child; |
|
#ifndef __U_BOOT__ |
|
glob_t *glob_target; |
|
int gr, flags = 0; |
|
#else |
|
char *str, *s; |
|
int argc, cnt; |
|
#endif |
|
|
|
debug_printf("done_word: %s %p\n", dest->data, child); |
|
if (dest->length == 0 && !dest->nonnull) { |
|
debug_printf(" true null, ignored\n"); |
|
return 0; |
|
} |
|
#ifndef __U_BOOT__ |
|
if (ctx->pending_redirect) { |
|
glob_target = &ctx->pending_redirect->word; |
|
} else { |
|
#endif |
|
if (child->group) { |
|
syntax(); |
|
return 1; /* syntax error, groups and arglists don't mix */ |
|
} |
|
if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { |
|
debug_printf("checking %s for reserved-ness\n",dest->data); |
|
if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; |
|
} |
|
#ifndef __U_BOOT__ |
|
glob_target = &child->glob_result; |
|
if (child->argv) flags |= GLOB_APPEND; |
|
#else |
|
for (cnt = 1, s = dest->data; s && *s; s++) { |
|
if (*s == '\\') s++; |
|
cnt++; |
|
} |
|
str = malloc(cnt); |
|
if (!str) return 1; |
|
if ( child->argv == NULL) { |
|
child->argc=0; |
|
} |
|
argc = ++child->argc; |
|
child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); |
|
if (child->argv == NULL) { |
|
free(str); |
|
return 1; |
|
} |
|
child->argv_nonnull = realloc(child->argv_nonnull, |
|
(argc+1)*sizeof(*child->argv_nonnull)); |
|
if (child->argv_nonnull == NULL) { |
|
free(str); |
|
return 1; |
|
} |
|
child->argv[argc-1]=str; |
|
child->argv_nonnull[argc-1] = dest->nonnull; |
|
child->argv[argc]=NULL; |
|
child->argv_nonnull[argc] = 0; |
|
for (s = dest->data; s && *s; s++,str++) { |
|
if (*s == '\\') s++; |
|
*str = *s; |
|
} |
|
*str = '\0'; |
|
#endif |
|
#ifndef __U_BOOT__ |
|
} |
|
gr = xglob(dest, flags, glob_target); |
|
if (gr != 0) return 1; |
|
#endif |
|
|
|
b_reset(dest); |
|
#ifndef __U_BOOT__ |
|
if (ctx->pending_redirect) { |
|
ctx->pending_redirect=NULL; |
|
if (glob_target->gl_pathc != 1) { |
|
error_msg("ambiguous redirect"); |
|
return 1; |
|
} |
|
} else { |
|
child->argv = glob_target->gl_pathv; |
|
} |
|
#endif |
|
if (ctx->w == RES_FOR) { |
|
done_word(dest,ctx); |
|
done_pipe(ctx,PIPE_SEQ); |
|
} |
|
return 0; |
|
} |
|
|
|
/* The only possible error here is out of memory, in which case |
|
* xmalloc exits. */ |
|
static int done_command(struct p_context *ctx) |
|
{ |
|
/* The child is really already in the pipe structure, so |
|
* advance the pipe counter and make a new, null child. |
|
* Only real trickiness here is that the uncommitted |
|
* child structure, to which ctx->child points, is not |
|
* counted in pi->num_progs. */ |
|
struct pipe *pi=ctx->pipe; |
|
struct child_prog *prog=ctx->child; |
|
|
|
if (prog && prog->group == NULL |
|
&& prog->argv == NULL |
|
#ifndef __U_BOOT__ |
|
&& prog->redirects == NULL) { |
|
#else |
|
) { |
|
#endif |
|
debug_printf("done_command: skipping null command\n"); |
|
return 0; |
|
} else if (prog) { |
|
pi->num_progs++; |
|
debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); |
|
} else { |
|
debug_printf("done_command: initializing\n"); |
|
} |
|
pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); |
|
|
|
prog = pi->progs + pi->num_progs; |
|
#ifndef __U_BOOT__ |
|
prog->redirects = NULL; |
|
#endif |
|
prog->argv = NULL; |
|
prog->argv_nonnull = NULL; |
|
#ifndef __U_BOOT__ |
|
prog->is_stopped = 0; |
|
#endif |
|
prog->group = NULL; |
|
#ifndef __U_BOOT__ |
|
prog->glob_result.gl_pathv = NULL; |
|
prog->family = pi; |
|
#endif |
|
prog->sp = 0; |
|
ctx->child = prog; |
|
prog->type = ctx->type; |
|
|
|
/* but ctx->pipe and ctx->list_head remain unchanged */ |
|
return 0; |
|
} |
|
|
|
static int done_pipe(struct p_context *ctx, pipe_style type) |
|
{ |
|
struct pipe *new_p; |
|
done_command(ctx); /* implicit closure of previous command */ |
|
debug_printf("done_pipe, type %d\n", type); |
|
ctx->pipe->followup = type; |
|
ctx->pipe->r_mode = ctx->w; |
|
new_p=new_pipe(); |
|
ctx->pipe->next = new_p; |
|
ctx->pipe = new_p; |
|
ctx->child = NULL; |
|
done_command(ctx); /* set up new pipe to accept commands */ |
|
return 0; |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
/* peek ahead in the in_str to find out if we have a "&n" construct, |
|
* as in "2>&1", that represents duplicating a file descriptor. |
|
* returns either -2 (syntax error), -1 (no &), or the number found. |
|
*/ |
|
static int redirect_dup_num(struct in_str *input) |
|
{ |
|
int ch, d=0, ok=0; |
|
ch = b_peek(input); |
|
if (ch != '&') return -1; |
|
|
|
b_getch(input); /* get the & */ |
|
ch=b_peek(input); |
|
if (ch == '-') { |
|
b_getch(input); |
|
return -3; /* "-" represents "close me" */ |
|
} |
|
while (isdigit(ch)) { |
|
d = d*10+(ch-'0'); |
|
ok=1; |
|
b_getch(input); |
|
ch = b_peek(input); |
|
} |
|
if (ok) return d; |
|
|
|
error_msg("ambiguous redirect"); |
|
return -2; |
|
} |
|
|
|
/* If a redirect is immediately preceded by a number, that number is |
|
* supposed to tell which file descriptor to redirect. This routine |
|
* looks for such preceding numbers. In an ideal world this routine |
|
* needs to handle all the following classes of redirects... |
|
* echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo |
|
* echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo |
|
* echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo |
|
* echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo |
|
* A -1 output from this program means no valid number was found, so the |
|
* caller should use the appropriate default for this redirection. |
|
*/ |
|
static int redirect_opt_num(o_string *o) |
|
{ |
|
int num; |
|
|
|
if (o->length==0) return -1; |
|
for(num=0; num<o->length; num++) { |
|
if (!isdigit(*(o->data+num))) { |
|
return -1; |
|
} |
|
} |
|
/* reuse num (and save an int) */ |
|
num=atoi(o->data); |
|
b_reset(o); |
|
return num; |
|
} |
|
|
|
FILE *generate_stream_from_list(struct pipe *head) |
|
{ |
|
FILE *pf; |
|
#if 1 |
|
int pid, channel[2]; |
|
if (pipe(channel)<0) perror_msg_and_die("pipe"); |
|
pid=fork(); |
|
if (pid<0) { |
|
perror_msg_and_die("fork"); |
|
} else if (pid==0) { |
|
close(channel[0]); |
|
if (channel[1] != 1) { |
|
dup2(channel[1],1); |
|
close(channel[1]); |
|
} |
|
#if 0 |
|
#define SURROGATE "surrogate response" |
|
write(1,SURROGATE,sizeof(SURROGATE)); |
|
_exit(run_list(head)); |
|
#else |
|
_exit(run_list_real(head)); /* leaks memory */ |
|
#endif |
|
} |
|
debug_printf("forked child %d\n",pid); |
|
close(channel[1]); |
|
pf = fdopen(channel[0],"r"); |
|
debug_printf("pipe on FILE *%p\n",pf); |
|
#else |
|
free_pipe_list(head,0); |
|
pf=popen("echo surrogate response","r"); |
|
debug_printf("started fake pipe on FILE *%p\n",pf); |
|
#endif |
|
return pf; |
|
} |
|
|
|
/* this version hacked for testing purposes */ |
|
/* return code is exit status of the process that is run. */ |
|
static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) |
|
{ |
|
int retcode; |
|
o_string result=NULL_O_STRING; |
|
struct p_context inner; |
|
FILE *p; |
|
struct in_str pipe_str; |
|
initialize_context(&inner); |
|
|
|
/* recursion to generate command */ |
|
retcode = parse_stream(&result, &inner, input, subst_end); |
|
if (retcode != 0) return retcode; /* syntax error or EOF */ |
|
done_word(&result, &inner); |
|
done_pipe(&inner, PIPE_SEQ); |
|
b_free(&result); |
|
|
|
p=generate_stream_from_list(inner.list_head); |
|
if (p==NULL) return 1; |
|
mark_open(fileno(p)); |
|
setup_file_in_str(&pipe_str, p); |
|
|
|
/* now send results of command back into original context */ |
|
retcode = parse_stream(dest, ctx, &pipe_str, '\0'); |
|
/* XXX In case of a syntax error, should we try to kill the child? |
|
* That would be tough to do right, so just read until EOF. */ |
|
if (retcode == 1) { |
|
while (b_getch(&pipe_str)!=EOF) { /* discard */ }; |
|
} |
|
|
|
debug_printf("done reading from pipe, pclose()ing\n"); |
|
/* This is the step that wait()s for the child. Should be pretty |
|
* safe, since we just read an EOF from its stdout. We could try |
|
* to better, by using wait(), and keeping track of background jobs |
|
* at the same time. That would be a lot of work, and contrary |
|
* to the KISS philosophy of this program. */ |
|
mark_closed(fileno(p)); |
|
retcode=pclose(p); |
|
free_pipe_list(inner.list_head,0); |
|
debug_printf("pclosed, retcode=%d\n",retcode); |
|
/* XXX this process fails to trim a single trailing newline */ |
|
return retcode; |
|
} |
|
|
|
static int parse_group(o_string *dest, struct p_context *ctx, |
|
struct in_str *input, int ch) |
|
{ |
|
int rcode, endch=0; |
|
struct p_context sub; |
|
struct child_prog *child = ctx->child; |
|
if (child->argv) { |
|
syntax(); |
|
return 1; /* syntax error, groups and arglists don't mix */ |
|
} |
|
initialize_context(&sub); |
|
switch(ch) { |
|
case '(': endch=')'; child->subshell=1; break; |
|
case '{': endch='}'; break; |
|
default: syntax(); /* really logic error */ |
|
} |
|
rcode=parse_stream(dest,&sub,input,endch); |
|
done_word(dest,&sub); /* finish off the final word in the subcontext */ |
|
done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ |
|
child->group = sub.list_head; |
|
return rcode; |
|
/* child remains "open", available for possible redirects */ |
|
} |
|
#endif |
|
|
|
/* basically useful version until someone wants to get fancier, |
|
* see the bash man page under "Parameter Expansion" */ |
|
static char *lookup_param(char *src) |
|
{ |
|
char *p; |
|
char *sep; |
|
char *default_val = NULL; |
|
int assign = 0; |
|
int expand_empty = 0; |
|
|
|
if (!src) |
|
return NULL; |
|
|
|
sep = strchr(src, ':'); |
|
|
|
if (sep) { |
|
*sep = '\0'; |
|
if (*(sep + 1) == '-') |
|
default_val = sep+2; |
|
if (*(sep + 1) == '=') { |
|
default_val = sep+2; |
|
assign = 1; |
|
} |
|
if (*(sep + 1) == '+') { |
|
default_val = sep+2; |
|
expand_empty = 1; |
|
} |
|
} |
|
|
|
p = env_get(src); |
|
if (!p) |
|
p = get_local_var(src); |
|
|
|
if (!p || strlen(p) == 0) { |
|
p = default_val; |
|
if (assign) { |
|
char *var = malloc(strlen(src)+strlen(default_val)+2); |
|
if (var) { |
|
sprintf(var, "%s=%s", src, default_val); |
|
set_local_var(var, 0); |
|
} |
|
free(var); |
|
} |
|
} else if (expand_empty) { |
|
p += strlen(p); |
|
} |
|
|
|
if (sep) |
|
*sep = ':'; |
|
|
|
return p; |
|
} |
|
|
|
#ifdef __U_BOOT__ |
|
static char *get_dollar_var(char ch) |
|
{ |
|
static char buf[40]; |
|
|
|
buf[0] = '\0'; |
|
switch (ch) { |
|
case '?': |
|
sprintf(buf, "%u", (unsigned int)last_return_code); |
|
break; |
|
default: |
|
return NULL; |
|
} |
|
return buf; |
|
} |
|
#endif |
|
|
|
/* return code: 0 for OK, 1 for syntax error */ |
|
static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) |
|
{ |
|
#ifndef __U_BOOT__ |
|
int i, advance=0; |
|
#else |
|
int advance=0; |
|
#endif |
|
#ifndef __U_BOOT__ |
|
char sep[]=" "; |
|
#endif |
|
int ch = input->peek(input); /* first character after the $ */ |
|
debug_printf("handle_dollar: ch=%c\n",ch); |
|
if (isalpha(ch)) { |
|
b_addchr(dest, SPECIAL_VAR_SYMBOL); |
|
ctx->child->sp++; |
|
while(ch=b_peek(input),isalnum(ch) || ch=='_') { |
|
b_getch(input); |
|
b_addchr(dest,ch); |
|
} |
|
b_addchr(dest, SPECIAL_VAR_SYMBOL); |
|
#ifndef __U_BOOT__ |
|
} else if (isdigit(ch)) { |
|
i = ch-'0'; /* XXX is $0 special? */ |
|
if (i<global_argc) { |
|
parse_string(dest, ctx, global_argv[i]); /* recursion */ |
|
} |
|
advance = 1; |
|
#endif |
|
} else switch (ch) { |
|
#ifndef __U_BOOT__ |
|
case '$': |
|
b_adduint(dest,getpid()); |
|
advance = 1; |
|
break; |
|
case '!': |
|
if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); |
|
advance = 1; |
|
break; |
|
#endif |
|
case '?': |
|
#ifndef __U_BOOT__ |
|
b_adduint(dest,last_return_code); |
|
#else |
|
ctx->child->sp++; |
|
b_addchr(dest, SPECIAL_VAR_SYMBOL); |
|
b_addchr(dest, '$'); |
|
b_addchr(dest, '?'); |
|
b_addchr(dest, SPECIAL_VAR_SYMBOL); |
|
#endif |
|
advance = 1; |
|
break; |
|
#ifndef __U_BOOT__ |
|
case '#': |
|
b_adduint(dest,global_argc ? global_argc-1 : 0); |
|
advance = 1; |
|
break; |
|
#endif |
|
case '{': |
|
b_addchr(dest, SPECIAL_VAR_SYMBOL); |
|
ctx->child->sp++; |
|
b_getch(input); |
|
/* XXX maybe someone will try to escape the '}' */ |
|
while(ch=b_getch(input),ch!=EOF && ch!='}') { |
|
b_addchr(dest,ch); |
|
} |
|
if (ch != '}') { |
|
syntax(); |
|
return 1; |
|
} |
|
b_addchr(dest, SPECIAL_VAR_SYMBOL); |
|
break; |
|
#ifndef __U_BOOT__ |
|
case '(': |
|
b_getch(input); |
|
process_command_subs(dest, ctx, input, ')'); |
|
break; |
|
case '*': |
|
sep[0]=ifs[0]; |
|
for (i=1; i<global_argc; i++) { |
|
parse_string(dest, ctx, global_argv[i]); |
|
if (i+1 < global_argc) parse_string(dest, ctx, sep); |
|
} |
|
break; |
|
case '@': |
|
case '-': |
|
case '_': |
|
/* still unhandled, but should be eventually */ |
|
error_msg("unhandled syntax: $%c",ch); |
|
return 1; |
|
break; |
|
#endif |
|
default: |
|
b_addqchr(dest,'$',dest->quote); |
|
} |
|
/* Eat the character if the flag was set. If the compiler |
|
* is smart enough, we could substitute "b_getch(input);" |
|
* for all the "advance = 1;" above, and also end up with |
|
* a nice size-optimized program. Hah! That'll be the day. |
|
*/ |
|
if (advance) b_getch(input); |
|
return 0; |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
int parse_string(o_string *dest, struct p_context *ctx, const char *src) |
|
{ |
|
struct in_str foo; |
|
setup_string_in_str(&foo, src); |
|
return parse_stream(dest, ctx, &foo, '\0'); |
|
} |
|
#endif |
|
|
|
/* return code is 0 for normal exit, 1 for syntax error */ |
|
static int parse_stream(o_string *dest, struct p_context *ctx, |
|
struct in_str *input, int end_trigger) |
|
{ |
|
unsigned int ch, m; |
|
#ifndef __U_BOOT__ |
|
int redir_fd; |
|
redir_type redir_style; |
|
#endif |
|
int next; |
|
|
|
/* Only double-quote state is handled in the state variable dest->quote. |
|
* A single-quote triggers a bypass of the main loop until its mate is |
|
* found. When recursing, quote state is passed in via dest->quote. */ |
|
|
|
debug_printf("parse_stream, end_trigger=%d\n",end_trigger); |
|
while ((ch=b_getch(input))!=EOF) { |
|
m = map[ch]; |
|
#ifdef __U_BOOT__ |
|
if (input->__promptme == 0) return 1; |
|
#endif |
|
next = (ch == '\n') ? 0 : b_peek(input); |
|
|
|
debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", |
|
ch >= ' ' ? ch : '.', ch, m, |
|
dest->quote, ctx->stack == NULL ? '*' : '.'); |
|
|
|
if (m==0 || ((m==1 || m==2) && dest->quote)) { |
|
b_addqchr(dest, ch, dest->quote); |
|
} else { |
|
if (m==2) { /* unquoted IFS */ |
|
if (done_word(dest, ctx)) { |
|
return 1; |
|
} |
|
/* If we aren't performing a substitution, treat a newline as a |
|
* command separator. */ |
|
if (end_trigger != '\0' && ch=='\n') |
|
done_pipe(ctx,PIPE_SEQ); |
|
} |
|
if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { |
|
debug_printf("leaving parse_stream (triggered)\n"); |
|
return 0; |
|
} |
|
#if 0 |
|
if (ch=='\n') { |
|
/* Yahoo! Time to run with it! */ |
|
done_pipe(ctx,PIPE_SEQ); |
|
run_list(ctx->list_head); |
|
initialize_context(ctx); |
|
} |
|
#endif |
|
if (m!=2) switch (ch) { |
|
case '#': |
|
if (dest->length == 0 && !dest->quote) { |
|
while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } |
|
} else { |
|
b_addqchr(dest, ch, dest->quote); |
|
} |
|
break; |
|
case '\\': |
|
if (next == EOF) { |
|
syntax(); |
|
return 1; |
|
} |
|
b_addqchr(dest, '\\', dest->quote); |
|
b_addqchr(dest, b_getch(input), dest->quote); |
|
break; |
|
case '$': |
|
if (handle_dollar(dest, ctx, input)!=0) return 1; |
|
break; |
|
case '\'': |
|
dest->nonnull = 1; |
|
while(ch=b_getch(input),ch!=EOF && ch!='\'') { |
|
#ifdef __U_BOOT__ |
|
if(input->__promptme == 0) return 1; |
|
#endif |
|
b_addchr(dest,ch); |
|
} |
|
if (ch==EOF) { |
|
syntax(); |
|
return 1; |
|
} |
|
break; |
|
case '"': |
|
dest->nonnull = 1; |
|
dest->quote = !dest->quote; |
|
break; |
|
#ifndef __U_BOOT__ |
|
case '`': |
|
process_command_subs(dest, ctx, input, '`'); |
|
break; |
|
case '>': |
|
redir_fd = redirect_opt_num(dest); |
|
done_word(dest, ctx); |
|
redir_style=REDIRECT_OVERWRITE; |
|
if (next == '>') { |
|
redir_style=REDIRECT_APPEND; |
|
b_getch(input); |
|
} else if (next == '(') { |
|
syntax(); /* until we support >(list) Process Substitution */ |
|
return 1; |
|
} |
|
setup_redirect(ctx, redir_fd, redir_style, input); |
|
break; |
|
case '<': |
|
redir_fd = redirect_opt_num(dest); |
|
done_word(dest, ctx); |
|
redir_style=REDIRECT_INPUT; |
|
if (next == '<') { |
|
redir_style=REDIRECT_HEREIS; |
|
b_getch(input); |
|
} else if (next == '>') { |
|
redir_style=REDIRECT_IO; |
|
b_getch(input); |
|
} else if (next == '(') { |
|
syntax(); /* until we support <(list) Process Substitution */ |
|
return 1; |
|
} |
|
setup_redirect(ctx, redir_fd, redir_style, input); |
|
break; |
|
#endif |
|
case ';': |
|
done_word(dest, ctx); |
|
done_pipe(ctx,PIPE_SEQ); |
|
break; |
|
case '&': |
|
done_word(dest, ctx); |
|
if (next=='&') { |
|
b_getch(input); |
|
done_pipe(ctx,PIPE_AND); |
|
} else { |
|
#ifndef __U_BOOT__ |
|
done_pipe(ctx,PIPE_BG); |
|
#else |
|
syntax_err(); |
|
return 1; |
|
#endif |
|
} |
|
break; |
|
case '|': |
|
done_word(dest, ctx); |
|
if (next=='|') { |
|
b_getch(input); |
|
done_pipe(ctx,PIPE_OR); |
|
} else { |
|
/* we could pick up a file descriptor choice here |
|
* with redirect_opt_num(), but bash doesn't do it. |
|
* "echo foo 2| cat" yields "foo 2". */ |
|
#ifndef __U_BOOT__ |
|
done_command(ctx); |
|
#else |
|
syntax_err(); |
|
return 1; |
|
#endif |
|
} |
|
break; |
|
#ifndef __U_BOOT__ |
|
case '(': |
|
case '{': |
|
if (parse_group(dest, ctx, input, ch)!=0) return 1; |
|
break; |
|
case ')': |
|
case '}': |
|
syntax(); /* Proper use of this character caught by end_trigger */ |
|
return 1; |
|
break; |
|
#endif |
|
case SUBSTED_VAR_SYMBOL: |
|
dest->nonnull = 1; |
|
while (ch = b_getch(input), ch != EOF && |
|
ch != SUBSTED_VAR_SYMBOL) { |
|
debug_printf("subst, pass=%d\n", ch); |
|
if (input->__promptme == 0) |
|
return 1; |
|
b_addchr(dest, ch); |
|
} |
|
debug_printf("subst, term=%d\n", ch); |
|
if (ch == EOF) { |
|
syntax(); |
|
return 1; |
|
} |
|
break; |
|
default: |
|
syntax(); /* this is really an internal logic error */ |
|
return 1; |
|
} |
|
} |
|
} |
|
/* complain if quote? No, maybe we just finished a command substitution |
|
* that was quoted. Example: |
|
* $ echo "`cat foo` plus more" |
|
* and we just got the EOF generated by the subshell that ran "cat foo" |
|
* The only real complaint is if we got an EOF when end_trigger != '\0', |
|
* that is, we were really supposed to get end_trigger, and never got |
|
* one before the EOF. Can't use the standard "syntax error" return code, |
|
* so that parse_stream_outer can distinguish the EOF and exit smoothly. */ |
|
debug_printf("leaving parse_stream (EOF)\n"); |
|
if (end_trigger != '\0') return -1; |
|
return 0; |
|
} |
|
|
|
static void mapset(const unsigned char *set, int code) |
|
{ |
|
const unsigned char *s; |
|
for (s=set; *s; s++) map[*s] = code; |
|
} |
|
|
|
static void update_ifs_map(void) |
|
{ |
|
/* char *ifs and char map[256] are both globals. */ |
|
ifs = (uchar *)env_get("IFS"); |
|
if (ifs == NULL) ifs=(uchar *)" \t\n"; |
|
/* Precompute a list of 'flow through' behavior so it can be treated |
|
* quickly up front. Computation is necessary because of IFS. |
|
* Special case handling of IFS == " \t\n" is not implemented. |
|
* The map[] array only really needs two bits each, and on most machines |
|
* that would be faster because of the reduced L1 cache footprint. |
|
*/ |
|
memset(map,0,sizeof(map)); /* most characters flow through always */ |
|
#ifndef __U_BOOT__ |
|
mapset((uchar *)"\\$'\"`", 3); /* never flow through */ |
|
mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ |
|
#else |
|
{ |
|
uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; |
|
mapset(subst, 3); /* never flow through */ |
|
} |
|
mapset((uchar *)"\\$'\"", 3); /* never flow through */ |
|
mapset((uchar *)";&|#", 1); /* flow through if quoted */ |
|
#endif |
|
mapset(ifs, 2); /* also flow through if quoted */ |
|
} |
|
|
|
/* most recursion does not come through here, the exeception is |
|
* from builtin_source() */ |
|
static int parse_stream_outer(struct in_str *inp, int flag) |
|
{ |
|
|
|
struct p_context ctx; |
|
o_string temp=NULL_O_STRING; |
|
int rcode; |
|
#ifdef __U_BOOT__ |
|
int code = 1; |
|
#endif |
|
do { |
|
ctx.type = flag; |
|
initialize_context(&ctx); |
|
update_ifs_map(); |
|
if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); |
|
inp->promptmode=1; |
|
rcode = parse_stream(&temp, &ctx, inp, |
|
flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n'); |
|
#ifdef __U_BOOT__ |
|
if (rcode == 1) flag_repeat = 0; |
|
#endif |
|
if (rcode != 1 && ctx.old_flag != 0) { |
|
syntax(); |
|
#ifdef __U_BOOT__ |
|
flag_repeat = 0; |
|
#endif |
|
} |
|
if (rcode != 1 && ctx.old_flag == 0) { |
|
done_word(&temp, &ctx); |
|
done_pipe(&ctx,PIPE_SEQ); |
|
#ifndef __U_BOOT__ |
|
run_list(ctx.list_head); |
|
#else |
|
code = run_list(ctx.list_head); |
|
if (code == -2) { /* exit */ |
|
b_free(&temp); |
|
code = 0; |
|
/* XXX hackish way to not allow exit from main loop */ |
|
if (inp->peek == file_peek) { |
|
printf("exit not allowed from main input shell.\n"); |
|
continue; |
|
} |
|
break; |
|
} |
|
if (code == -1) |
|
flag_repeat = 0; |
|
#endif |
|
} else { |
|
if (ctx.old_flag != 0) { |
|
free(ctx.stack); |
|
b_reset(&temp); |
|
} |
|
#ifdef __U_BOOT__ |
|
if (inp->__promptme == 0) printf("<INTERRUPT>\n"); |
|
inp->__promptme = 1; |
|
#endif |
|
temp.nonnull = 0; |
|
temp.quote = 0; |
|
inp->p = NULL; |
|
free_pipe_list(ctx.list_head,0); |
|
} |
|
b_free(&temp); |
|
/* loop on syntax errors, return on EOF */ |
|
} while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) && |
|
(inp->peek != static_peek || b_peek(inp))); |
|
#ifndef __U_BOOT__ |
|
return 0; |
|
#else |
|
return (code != 0) ? 1 : 0; |
|
#endif /* __U_BOOT__ */ |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
static int parse_string_outer(const char *s, int flag) |
|
#else |
|
int parse_string_outer(const char *s, int flag) |
|
#endif /* __U_BOOT__ */ |
|
{ |
|
struct in_str input; |
|
#ifdef __U_BOOT__ |
|
char *p = NULL; |
|
int rcode; |
|
if (!s) |
|
return 1; |
|
if (!*s) |
|
return 0; |
|
if (!(p = strchr(s, '\n')) || *++p) { |
|
p = xmalloc(strlen(s) + 2); |
|
strcpy(p, s); |
|
strcat(p, "\n"); |
|
setup_string_in_str(&input, p); |
|
rcode = parse_stream_outer(&input, flag); |
|
free(p); |
|
return rcode; |
|
} else { |
|
#endif |
|
setup_string_in_str(&input, s); |
|
return parse_stream_outer(&input, flag); |
|
#ifdef __U_BOOT__ |
|
} |
|
#endif |
|
} |
|
|
|
#ifndef __U_BOOT__ |
|
static int parse_file_outer(FILE *f) |
|
#else |
|
int parse_file_outer(void) |
|
#endif |
|
{ |
|
int rcode; |
|
struct in_str input; |
|
#ifndef __U_BOOT__ |
|
setup_file_in_str(&input, f); |
|
#else |
|
setup_file_in_str(&input); |
|
#endif |
|
rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); |
|
return rcode; |
|
} |
|
|
|
#ifdef __U_BOOT__ |
|
#ifdef CONFIG_NEEDS_MANUAL_RELOC |
|
static void u_boot_hush_reloc(void) |
|
{ |
|
unsigned long addr; |
|
struct reserved_combo *r; |
|
|
|
for (r=reserved_list; r<reserved_list+NRES; r++) { |
|
addr = (ulong) (r->literal) + gd->reloc_off; |
|
r->literal = (char *)addr; |
|
} |
|
} |
|
#endif |
|
|
|
int u_boot_hush_start(void) |
|
{ |
|
if (top_vars == NULL) { |
|
top_vars = malloc(sizeof(struct variables)); |
|
top_vars->name = "HUSH_VERSION"; |
|
top_vars->value = "0.01"; |
|
top_vars->next = NULL; |
|
top_vars->flg_export = 0; |
|
top_vars->flg_read_only = 1; |
|
#ifdef CONFIG_NEEDS_MANUAL_RELOC |
|
u_boot_hush_reloc(); |
|
#endif |
|
} |
|
return 0; |
|
} |
|
|
|
static void *xmalloc(size_t size) |
|
{ |
|
void *p = NULL; |
|
|
|
if (!(p = malloc(size))) { |
|
printf("ERROR : memory not allocated\n"); |
|
for(;;); |
|
} |
|
return p; |
|
} |
|
|
|
static void *xrealloc(void *ptr, size_t size) |
|
{ |
|
void *p = NULL; |
|
|
|
if (!(p = realloc(ptr, size))) { |
|
printf("ERROR : memory not allocated\n"); |
|
for(;;); |
|
} |
|
return p; |
|
} |
|
#endif /* __U_BOOT__ */ |
|
|
|
#ifndef __U_BOOT__ |
|
/* Make sure we have a controlling tty. If we get started under a job |
|
* aware app (like bash for example), make sure we are now in charge so |
|
* we don't fight over who gets the foreground */ |
|
static void setup_job_control(void) |
|
{ |
|
static pid_t shell_pgrp; |
|
/* Loop until we are in the foreground. */ |
|
while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) |
|
kill (- shell_pgrp, SIGTTIN); |
|
|
|
/* Ignore interactive and job-control signals. */ |
|
signal(SIGINT, SIG_IGN); |
|
signal(SIGQUIT, SIG_IGN); |
|
signal(SIGTERM, SIG_IGN); |
|
signal(SIGTSTP, SIG_IGN); |
|
signal(SIGTTIN, SIG_IGN); |
|
signal(SIGTTOU, SIG_IGN); |
|
signal(SIGCHLD, SIG_IGN); |
|
|
|
/* Put ourselves in our own process group. */ |
|
setsid(); |
|
shell_pgrp = getpid (); |
|
setpgid (shell_pgrp, shell_pgrp); |
|
|
|
/* Grab control of the terminal. */ |
|
tcsetpgrp(shell_terminal, shell_pgrp); |
|
} |
|
|
|
int hush_main(int argc, char * const *argv) |
|
{ |
|
int opt; |
|
FILE *input; |
|
char **e = environ; |
|
|
|
/* XXX what should these be while sourcing /etc/profile? */ |
|
global_argc = argc; |
|
global_argv = argv; |
|
|
|
/* (re?) initialize globals. Sometimes hush_main() ends up calling |
|
* hush_main(), therefore we cannot rely on the BSS to zero out this |
|
* stuff. Reset these to 0 every time. */ |
|
ifs = NULL; |
|
/* map[] is taken care of with call to update_ifs_map() */ |
|
fake_mode = 0; |
|
interactive = 0; |
|
close_me_head = NULL; |
|
last_bg_pid = 0; |
|
job_list = NULL; |
|
last_jobid = 0; |
|
|
|
/* Initialize some more globals to non-zero values */ |
|
set_cwd(); |
|
#ifdef CONFIG_FEATURE_COMMAND_EDITING |
|
cmdedit_set_initial_prompt(); |
|
#else |
|
PS1 = NULL; |
|
#endif |
|
PS2 = "> "; |
|
|
|
/* initialize our shell local variables with the values |
|
* currently living in the environment */ |
|
if (e) { |
|
for (; *e; e++) |
|
set_local_var(*e, 2); /* without call putenv() */ |
|
} |
|
|
|
last_return_code=EXIT_SUCCESS; |
|
|
|
|
|
if (argv[0] && argv[0][0] == '-') { |
|
debug_printf("\nsourcing /etc/profile\n"); |
|
if ((input = fopen("/etc/profile", "r")) != NULL) { |
|
mark_open(fileno(input)); |
|
parse_file_outer(input); |
|
mark_closed(fileno(input)); |
|
fclose(input); |
|
} |
|
} |
|
input=stdin; |
|
|
|
while ((opt = getopt(argc, argv, "c:xif")) > 0) { |
|
switch (opt) { |
|
case 'c': |
|
{ |
|
global_argv = argv+optind; |
|
global_argc = argc-optind; |
|
opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); |
|
goto final_return; |
|
} |
|
break; |
|
case 'i': |
|
interactive++; |
|
break; |
|
case 'f': |
|
fake_mode++; |
|
break; |
|
default: |
|
#ifndef BB_VER |
|
fprintf(stderr, "Usage: sh [FILE]...\n" |
|
" or: sh -c command [args]...\n\n"); |
|
exit(EXIT_FAILURE); |
|
#else |
|
show_usage(); |
|
#endif |
|
} |
|
} |
|
/* A shell is interactive if the `-i' flag was given, or if all of |
|
* the following conditions are met: |
|
* no -c command |
|
* no arguments remaining or the -s flag given |
|
* standard input is a terminal |
|
* standard output is a terminal |
|
* Refer to Posix.2, the description of the `sh' utility. */ |
|
if (argv[optind]==NULL && input==stdin && |
|
isatty(fileno(stdin)) && isatty(fileno(stdout))) { |
|
interactive++; |
|
} |
|
|
|
debug_printf("\ninteractive=%d\n", interactive); |
|
if (interactive) { |
|
/* Looks like they want an interactive shell */ |
|
#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET |
|
printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); |
|
printf( "Enter 'help' for a list of built-in commands.\n\n"); |
|
#endif |
|
setup_job_control(); |
|
} |
|
|
|
if (argv[optind]==NULL) { |
|
opt=parse_file_outer(stdin); |
|
goto final_return; |
|
} |
|
|
|
debug_printf("\nrunning script '%s'\n", argv[optind]); |
|
global_argv = argv+optind; |
|
global_argc = argc-optind; |
|
input = xfopen(argv[optind], "r"); |
|
opt = parse_file_outer(input); |
|
|
|
#ifdef CONFIG_FEATURE_CLEAN_UP |
|
fclose(input); |
|
if (cwd && cwd != unknown) |
|
free((char*)cwd); |
|
{ |
|
struct variables *cur, *tmp; |
|
for(cur = top_vars; cur; cur = tmp) { |
|
tmp = cur->next; |
|
if (!cur->flg_read_only) { |
|
free(cur->name); |
|
free(cur->value); |
|
free(cur); |
|
} |
|
} |
|
} |
|
#endif |
|
|
|
final_return: |
|
return(opt?opt:last_return_code); |
|
} |
|
#endif |
|
|
|
static char *insert_var_value(char *inp) |
|
{ |
|
return insert_var_value_sub(inp, 0); |
|
} |
|
|
|
static char *insert_var_value_sub(char *inp, int tag_subst) |
|
{ |
|
int res_str_len = 0; |
|
int len; |
|
int done = 0; |
|
char *p, *p1, *res_str = NULL; |
|
|
|
while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { |
|
/* check the beginning of the string for normal characters */ |
|
if (p != inp) { |
|
/* copy any characters to the result string */ |
|
len = p - inp; |
|
res_str = xrealloc(res_str, (res_str_len + len)); |
|
strncpy((res_str + res_str_len), inp, len); |
|
res_str_len += len; |
|
} |
|
inp = ++p; |
|
/* find the ending marker */ |
|
p = strchr(inp, SPECIAL_VAR_SYMBOL); |
|
*p = '\0'; |
|
/* look up the value to substitute */ |
|
if ((p1 = lookup_param(inp))) { |
|
if (tag_subst) |
|
len = res_str_len + strlen(p1) + 2; |
|
else |
|
len = res_str_len + strlen(p1); |
|
res_str = xrealloc(res_str, (1 + len)); |
|
if (tag_subst) { |
|
/* |
|
* copy the variable value to the result |
|
* string |
|
*/ |
|
strcpy((res_str + res_str_len + 1), p1); |
|
|
|
/* |
|
* mark the replaced text to be accepted as |
|
* is |
|
*/ |
|
res_str[res_str_len] = SUBSTED_VAR_SYMBOL; |
|
res_str[res_str_len + 1 + strlen(p1)] = |
|
SUBSTED_VAR_SYMBOL; |
|
} else |
|
/* |
|
* copy the variable value to the result |
|
* string |
|
*/ |
|
strcpy((res_str + res_str_len), p1); |
|
|
|
res_str_len = len; |
|
} |
|
*p = SPECIAL_VAR_SYMBOL; |
|
inp = ++p; |
|
done = 1; |
|
} |
|
if (done) { |
|
res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); |
|
strcpy((res_str + res_str_len), inp); |
|
while ((p = strchr(res_str, '\n'))) { |
|
*p = ' '; |
|
} |
|
} |
|
return (res_str == NULL) ? inp : res_str; |
|
} |
|
|
|
static char **make_list_in(char **inp, char *name) |
|
{ |
|
int len, i; |
|
int name_len = strlen(name); |
|
int n = 0; |
|
char **list; |
|
char *p1, *p2, *p3; |
|
|
|
/* create list of variable values */ |
|
list = xmalloc(sizeof(*list)); |
|
for (i = 0; inp[i]; i++) { |
|
p3 = insert_var_value(inp[i]); |
|
p1 = p3; |
|
while (*p1) { |
|
if (*p1 == ' ') { |
|
p1++; |
|
continue; |
|
} |
|
if ((p2 = strchr(p1, ' '))) { |
|
len = p2 - p1; |
|
} else { |
|
len = strlen(p1); |
|
p2 = p1 + len; |
|
} |
|
/* we use n + 2 in realloc for list,because we add |
|
* new element and then we will add NULL element */ |
|
list = xrealloc(list, sizeof(*list) * (n + 2)); |
|
list[n] = xmalloc(2 + name_len + len); |
|
strcpy(list[n], name); |
|
strcat(list[n], "="); |
|
strncat(list[n], p1, len); |
|
list[n++][name_len + len + 1] = '\0'; |
|
p1 = p2; |
|
} |
|
if (p3 != inp[i]) free(p3); |
|
} |
|
list[n] = NULL; |
|
return list; |
|
} |
|
|
|
/* |
|
* Make new string for parser |
|
* inp - array of argument strings to flatten |
|
* nonnull - indicates argument was quoted when originally parsed |
|
*/ |
|
static char *make_string(char **inp, int *nonnull) |
|
{ |
|
char *p; |
|
char *str = NULL; |
|
int n; |
|
int len = 2; |
|
char *noeval_str; |
|
int noeval = 0; |
|
|
|
noeval_str = get_local_var("HUSH_NO_EVAL"); |
|
if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') |
|
noeval = 1; |
|
for (n = 0; inp[n]; n++) { |
|
p = insert_var_value_sub(inp[n], noeval); |
|
str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); |
|
if (n) { |
|
strcat(str, " "); |
|
} else { |
|
*str = '\0'; |
|
} |
|
if (nonnull[n]) |
|
strcat(str, "'"); |
|
strcat(str, p); |
|
if (nonnull[n]) |
|
strcat(str, "'"); |
|
len = strlen(str) + 3; |
|
if (p != inp[n]) free(p); |
|
} |
|
len = strlen(str); |
|
*(str + len) = '\n'; |
|
*(str + len + 1) = '\0'; |
|
return str; |
|
} |
|
|
|
#ifdef __U_BOOT__ |
|
static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, |
|
char * const argv[]) |
|
{ |
|
int i, k; |
|
int rcode = 0; |
|
struct variables *cur; |
|
|
|
if (argc == 1) { /* Print all env variables */ |
|
for (cur = top_vars; cur; cur = cur->next) { |
|
printf ("%s=%s\n", cur->name, cur->value); |
|
if (ctrlc ()) { |
|
puts ("\n ** Abort\n"); |
|
return 1; |
|
} |
|
} |
|
return 0; |
|
} |
|
for (i = 1; i < argc; ++i) { /* print single env variables */ |
|
char *name = argv[i]; |
|
|
|
k = -1; |
|
for (cur = top_vars; cur; cur = cur->next) { |
|
if(strcmp (cur->name, name) == 0) { |
|
k = 0; |
|
printf ("%s=%s\n", cur->name, cur->value); |
|
} |
|
if (ctrlc ()) { |
|
puts ("\n ** Abort\n"); |
|
return 1; |
|
} |
|
} |
|
if (k < 0) { |
|
printf ("## Error: \"%s\" not defined\n", name); |
|
rcode ++; |
|
} |
|
} |
|
return rcode; |
|
} |
|
|
|
U_BOOT_CMD( |
|
showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, |
|
"print local hushshell variables", |
|
"\n - print values of all hushshell variables\n" |
|
"showvar name ...\n" |
|
" - print value of hushshell variable 'name'" |
|
); |
|
|
|
#endif |
|
/****************************************************************************/
|
|
|