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| // 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;
| }
|
|
