forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
998 B
57 lines
998 B
// SPDX-License-Identifier: GPL-2.0 |
|
#define _GNU_SOURCE |
|
#include <errno.h> |
|
#include <fcntl.h> |
|
#include <limits.h> |
|
#include <stdio.h> |
|
#include <stdlib.h> |
|
#include <unistd.h> |
|
#include <sys/types.h> |
|
#include <sys/stat.h> |
|
|
|
int main(int argc, char *argv[]) |
|
{ |
|
int fd; |
|
size_t size; |
|
ssize_t spliced; |
|
|
|
if (argc < 2) { |
|
fprintf(stderr, "Usage: %s INPUT [BYTES]\n", argv[0]); |
|
return EXIT_FAILURE; |
|
} |
|
|
|
fd = open(argv[1], O_RDONLY); |
|
if (fd < 0) { |
|
perror(argv[1]); |
|
return EXIT_FAILURE; |
|
} |
|
|
|
if (argc == 3) |
|
size = atol(argv[2]); |
|
else { |
|
struct stat statbuf; |
|
|
|
if (fstat(fd, &statbuf) < 0) { |
|
perror(argv[1]); |
|
return EXIT_FAILURE; |
|
} |
|
|
|
if (statbuf.st_size > INT_MAX) { |
|
fprintf(stderr, "%s: Too big\n", argv[1]); |
|
return EXIT_FAILURE; |
|
} |
|
|
|
size = statbuf.st_size; |
|
} |
|
|
|
/* splice(2) file to stdout. */ |
|
spliced = splice(fd, NULL, STDOUT_FILENO, NULL, |
|
size, SPLICE_F_MOVE); |
|
if (spliced < 0) { |
|
perror("splice"); |
|
return EXIT_FAILURE; |
|
} |
|
|
|
close(fd); |
|
return EXIT_SUCCESS; |
|
}
|
|
|