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#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#ifndef SMALL
#include <getopt.h>
#include <unistd.h>
#endif
#ifndef DEFAULT_PROGRAM_NAME
# define DEFAULT_PROGRAM_NAME "exchange"
#endif
#ifndef VERSION
# define VERSION ""
#endif
#ifndef SMALL
static char *program_name = DEFAULT_PROGRAM_NAME;
static struct option const long_options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'v' },
{ NULL, 0, NULL, 0 },
};
void usage(FILE *fd) {
fprintf(fd, "\
Usage: %s [OPTION]... <PATH 1> <PATH 2>\n\
Exchange PATH 1 and PATH 2.\n",
program_name);
fputs("\n", fd);
fputs("\
Available Options:\n\
-h, --help display this help and exit\n\
-v, --version output version information and exit\n", fd);
}
void version() {
printf("%s %s\n", program_name, VERSION);
printf("Build on %s %s.\n", __DATE__, __TIME__);
}
#endif // !SMALL
int main(int argc, char *argv[]) {
char *path1, *path2;
#ifndef SMALL
if (argc > 0)
program_name = argv[0];
int c;
while ((c = getopt_long(argc, argv, "hvt", long_options, NULL))
!= -1)
{
switch (c) {
case 't':
break;
case 'h': // help
usage(stdout);
return EXIT_SUCCESS;
case 'v': // version
version();
return EXIT_SUCCESS;
default:
usage(stderr);
return EXIT_FAILURE;
}
}
if (argc - optind != 2) {
fprintf(stderr, "%s: invalid number of arguments. Expected 2.\n", program_name);
usage(stderr);
return EXIT_FAILURE;
}
#else
// We currently don't accept any options
// when compiling with SMALL
// Define optind manually, because we don't use optparse.
const int optind = 1;
#endif // !SMALL
if (argc - optind != 2) {
#ifndef SMALL
fprintf(stderr, "%s: invalid number of arguments. Expected 2.\n", program_name);
usage(stderr);
#endif
return EXIT_FAILURE;
}
path1 = argv[optind];
path2 = argv[optind + 1];
// Do the magic
if (renameat2(AT_FDCWD, path1, AT_FDCWD, path2, RENAME_EXCHANGE) != 0) {
int errsv = errno;
#ifndef SMALL
perror(program_name);
#endif
return -errsv;
}
return EXIT_SUCCESS;
}
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