58 lines
998 B
C
58 lines
998 B
C
// 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;
|
|
}
|