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422 lines
10 KiB
422 lines
10 KiB
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ |
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/* |
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* stdlib function definitions for NOLIBC |
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* Copyright (C) 2017-2021 Willy Tarreau <[email protected]> |
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*/ |
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#ifndef _NOLIBC_STDLIB_H |
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#define _NOLIBC_STDLIB_H |
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#include "std.h" |
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#include "arch.h" |
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#include "types.h" |
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#include "sys.h" |
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#include "string.h" |
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struct nolibc_heap { |
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size_t len; |
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char user_p[] __attribute__((__aligned__)); |
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}; |
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/* Buffer used to store int-to-ASCII conversions. Will only be implemented if |
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* any of the related functions is implemented. The area is large enough to |
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* store "18446744073709551615" or "-9223372036854775808" and the final zero. |
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*/ |
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static __attribute__((unused)) char itoa_buffer[21]; |
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/* |
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* As much as possible, please keep functions alphabetically sorted. |
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*/ |
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/* must be exported, as it's used by libgcc for various divide functions */ |
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__attribute__((weak,unused,noreturn,section(".text.nolibc_abort"))) |
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void abort(void) |
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{ |
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sys_kill(sys_getpid(), SIGABRT); |
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for (;;); |
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} |
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static __attribute__((unused)) |
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long atol(const char *s) |
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{ |
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unsigned long ret = 0; |
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unsigned long d; |
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int neg = 0; |
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if (*s == '-') { |
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neg = 1; |
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s++; |
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} |
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while (1) { |
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d = (*s++) - '0'; |
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if (d > 9) |
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break; |
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ret *= 10; |
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ret += d; |
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} |
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return neg ? -ret : ret; |
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} |
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static __attribute__((unused)) |
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int atoi(const char *s) |
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{ |
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return atol(s); |
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} |
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static __attribute__((unused)) |
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void free(void *ptr) |
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{ |
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struct nolibc_heap *heap; |
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if (!ptr) |
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return; |
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heap = container_of(ptr, struct nolibc_heap, user_p); |
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munmap(heap, heap->len); |
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} |
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/* getenv() tries to find the environment variable named <name> in the |
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* environment array pointed to by global variable "environ" which must be |
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* declared as a char **, and must be terminated by a NULL (it is recommended |
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* to set this variable to the "envp" argument of main()). If the requested |
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* environment variable exists its value is returned otherwise NULL is |
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* returned. getenv() is forcefully inlined so that the reference to "environ" |
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* will be dropped if unused, even at -O0. |
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*/ |
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static __attribute__((unused)) |
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char *_getenv(const char *name, char **environ) |
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{ |
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int idx, i; |
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if (environ) { |
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for (idx = 0; environ[idx]; idx++) { |
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for (i = 0; name[i] && name[i] == environ[idx][i];) |
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i++; |
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if (!name[i] && environ[idx][i] == '=') |
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return &environ[idx][i+1]; |
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} |
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} |
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return NULL; |
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} |
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static inline __attribute__((unused,always_inline)) |
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char *getenv(const char *name) |
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{ |
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extern char **environ; |
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return _getenv(name, environ); |
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} |
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static __attribute__((unused)) |
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void *malloc(size_t len) |
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{ |
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struct nolibc_heap *heap; |
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/* Always allocate memory with size multiple of 4096. */ |
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len = sizeof(*heap) + len; |
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len = (len + 4095UL) & -4096UL; |
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heap = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, |
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-1, 0); |
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if (__builtin_expect(heap == MAP_FAILED, 0)) |
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return NULL; |
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heap->len = len; |
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return heap->user_p; |
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} |
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static __attribute__((unused)) |
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void *calloc(size_t size, size_t nmemb) |
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{ |
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size_t x = size * nmemb; |
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if (__builtin_expect(size && ((x / size) != nmemb), 0)) { |
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SET_ERRNO(ENOMEM); |
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return NULL; |
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} |
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/* |
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* No need to zero the heap, the MAP_ANONYMOUS in malloc() |
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* already does it. |
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*/ |
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return malloc(x); |
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} |
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static __attribute__((unused)) |
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void *realloc(void *old_ptr, size_t new_size) |
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{ |
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struct nolibc_heap *heap; |
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size_t user_p_len; |
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void *ret; |
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if (!old_ptr) |
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return malloc(new_size); |
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heap = container_of(old_ptr, struct nolibc_heap, user_p); |
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user_p_len = heap->len - sizeof(*heap); |
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/* |
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* Don't realloc() if @user_p_len >= @new_size, this block of |
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* memory is still enough to handle the @new_size. Just return |
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* the same pointer. |
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*/ |
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if (user_p_len >= new_size) |
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return old_ptr; |
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ret = malloc(new_size); |
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if (__builtin_expect(!ret, 0)) |
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return NULL; |
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memcpy(ret, heap->user_p, heap->len); |
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munmap(heap, heap->len); |
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return ret; |
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} |
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/* Converts the unsigned long integer <in> to its hex representation into |
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* buffer <buffer>, which must be long enough to store the number and the |
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* trailing zero (17 bytes for "ffffffffffffffff" or 9 for "ffffffff"). The |
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* buffer is filled from the first byte, and the number of characters emitted |
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* (not counting the trailing zero) is returned. The function is constructed |
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* in a way to optimize the code size and avoid any divide that could add a |
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* dependency on large external functions. |
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*/ |
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static __attribute__((unused)) |
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int utoh_r(unsigned long in, char *buffer) |
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{ |
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signed char pos = (~0UL > 0xfffffffful) ? 60 : 28; |
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int digits = 0; |
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int dig; |
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do { |
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dig = in >> pos; |
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in -= (uint64_t)dig << pos; |
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pos -= 4; |
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if (dig || digits || pos < 0) { |
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if (dig > 9) |
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dig += 'a' - '0' - 10; |
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buffer[digits++] = '0' + dig; |
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} |
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} while (pos >= 0); |
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buffer[digits] = 0; |
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return digits; |
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} |
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/* converts unsigned long <in> to an hex string using the static itoa_buffer |
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* and returns the pointer to that string. |
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*/ |
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static inline __attribute__((unused)) |
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char *utoh(unsigned long in) |
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{ |
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utoh_r(in, itoa_buffer); |
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return itoa_buffer; |
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} |
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/* Converts the unsigned long integer <in> to its string representation into |
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* buffer <buffer>, which must be long enough to store the number and the |
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* trailing zero (21 bytes for 18446744073709551615 in 64-bit, 11 for |
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* 4294967295 in 32-bit). The buffer is filled from the first byte, and the |
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* number of characters emitted (not counting the trailing zero) is returned. |
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* The function is constructed in a way to optimize the code size and avoid |
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* any divide that could add a dependency on large external functions. |
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*/ |
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static __attribute__((unused)) |
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int utoa_r(unsigned long in, char *buffer) |
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{ |
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unsigned long lim; |
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int digits = 0; |
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int pos = (~0UL > 0xfffffffful) ? 19 : 9; |
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int dig; |
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do { |
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for (dig = 0, lim = 1; dig < pos; dig++) |
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lim *= 10; |
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if (digits || in >= lim || !pos) { |
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for (dig = 0; in >= lim; dig++) |
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in -= lim; |
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buffer[digits++] = '0' + dig; |
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} |
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} while (pos--); |
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buffer[digits] = 0; |
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return digits; |
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} |
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/* Converts the signed long integer <in> to its string representation into |
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* buffer <buffer>, which must be long enough to store the number and the |
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* trailing zero (21 bytes for -9223372036854775808 in 64-bit, 12 for |
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* -2147483648 in 32-bit). The buffer is filled from the first byte, and the |
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* number of characters emitted (not counting the trailing zero) is returned. |
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*/ |
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static __attribute__((unused)) |
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int itoa_r(long in, char *buffer) |
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{ |
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char *ptr = buffer; |
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int len = 0; |
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if (in < 0) { |
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in = -in; |
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*(ptr++) = '-'; |
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len++; |
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} |
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len += utoa_r(in, ptr); |
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return len; |
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} |
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/* for historical compatibility, same as above but returns the pointer to the |
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* buffer. |
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*/ |
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static inline __attribute__((unused)) |
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char *ltoa_r(long in, char *buffer) |
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{ |
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itoa_r(in, buffer); |
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return buffer; |
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} |
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/* converts long integer <in> to a string using the static itoa_buffer and |
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* returns the pointer to that string. |
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*/ |
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static inline __attribute__((unused)) |
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char *itoa(long in) |
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{ |
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itoa_r(in, itoa_buffer); |
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return itoa_buffer; |
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} |
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/* converts long integer <in> to a string using the static itoa_buffer and |
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* returns the pointer to that string. Same as above, for compatibility. |
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*/ |
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static inline __attribute__((unused)) |
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char *ltoa(long in) |
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{ |
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itoa_r(in, itoa_buffer); |
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return itoa_buffer; |
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} |
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/* converts unsigned long integer <in> to a string using the static itoa_buffer |
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* and returns the pointer to that string. |
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*/ |
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static inline __attribute__((unused)) |
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char *utoa(unsigned long in) |
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{ |
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utoa_r(in, itoa_buffer); |
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return itoa_buffer; |
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} |
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/* Converts the unsigned 64-bit integer <in> to its hex representation into |
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* buffer <buffer>, which must be long enough to store the number and the |
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* trailing zero (17 bytes for "ffffffffffffffff"). The buffer is filled from |
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* the first byte, and the number of characters emitted (not counting the |
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* trailing zero) is returned. The function is constructed in a way to optimize |
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* the code size and avoid any divide that could add a dependency on large |
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* external functions. |
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*/ |
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static __attribute__((unused)) |
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int u64toh_r(uint64_t in, char *buffer) |
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{ |
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signed char pos = 60; |
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int digits = 0; |
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int dig; |
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do { |
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if (sizeof(long) >= 8) { |
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dig = (in >> pos) & 0xF; |
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} else { |
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/* 32-bit platforms: avoid a 64-bit shift */ |
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uint32_t d = (pos >= 32) ? (in >> 32) : in; |
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dig = (d >> (pos & 31)) & 0xF; |
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} |
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if (dig > 9) |
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dig += 'a' - '0' - 10; |
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pos -= 4; |
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if (dig || digits || pos < 0) |
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buffer[digits++] = '0' + dig; |
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} while (pos >= 0); |
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buffer[digits] = 0; |
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return digits; |
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} |
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/* converts uint64_t <in> to an hex string using the static itoa_buffer and |
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* returns the pointer to that string. |
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*/ |
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static inline __attribute__((unused)) |
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char *u64toh(uint64_t in) |
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{ |
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u64toh_r(in, itoa_buffer); |
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return itoa_buffer; |
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} |
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/* Converts the unsigned 64-bit integer <in> to its string representation into |
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* buffer <buffer>, which must be long enough to store the number and the |
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* trailing zero (21 bytes for 18446744073709551615). The buffer is filled from |
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* the first byte, and the number of characters emitted (not counting the |
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* trailing zero) is returned. The function is constructed in a way to optimize |
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* the code size and avoid any divide that could add a dependency on large |
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* external functions. |
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*/ |
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static __attribute__((unused)) |
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int u64toa_r(uint64_t in, char *buffer) |
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{ |
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unsigned long long lim; |
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int digits = 0; |
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int pos = 19; /* start with the highest possible digit */ |
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int dig; |
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do { |
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for (dig = 0, lim = 1; dig < pos; dig++) |
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lim *= 10; |
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if (digits || in >= lim || !pos) { |
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for (dig = 0; in >= lim; dig++) |
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in -= lim; |
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buffer[digits++] = '0' + dig; |
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} |
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} while (pos--); |
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buffer[digits] = 0; |
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return digits; |
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} |
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/* Converts the signed 64-bit integer <in> to its string representation into |
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* buffer <buffer>, which must be long enough to store the number and the |
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* trailing zero (21 bytes for -9223372036854775808). The buffer is filled from |
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* the first byte, and the number of characters emitted (not counting the |
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* trailing zero) is returned. |
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*/ |
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static __attribute__((unused)) |
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int i64toa_r(int64_t in, char *buffer) |
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{ |
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char *ptr = buffer; |
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int len = 0; |
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if (in < 0) { |
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in = -in; |
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*(ptr++) = '-'; |
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len++; |
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} |
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len += u64toa_r(in, ptr); |
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return len; |
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} |
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/* converts int64_t <in> to a string using the static itoa_buffer and returns |
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* the pointer to that string. |
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*/ |
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static inline __attribute__((unused)) |
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char *i64toa(int64_t in) |
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{ |
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i64toa_r(in, itoa_buffer); |
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return itoa_buffer; |
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} |
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/* converts uint64_t <in> to a string using the static itoa_buffer and returns |
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* the pointer to that string. |
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*/ |
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static inline __attribute__((unused)) |
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char *u64toa(uint64_t in) |
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{ |
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u64toa_r(in, itoa_buffer); |
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return itoa_buffer; |
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} |
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#endif /* _NOLIBC_STDLIB_H */
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