sbase/readlink.c

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/* See LICENSE file for copyright and license details. */
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-efmn] file\n", argv0);
}
int
main(int argc, char *argv[])
{
char buf[PATH_MAX];
bool nflag = false;
bool fflag = false;
ssize_t n;
ARGBEGIN {
case 'e':
case 'm':
eprintf("not implemented\n");
case 'f':
fflag = true;
break;
case 'n':
nflag = true;
break;
default:
usage();
} ARGEND;
if (argc != 1)
usage();
if (strlen(argv[0]) > PATH_MAX - 1)
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return 1;
if (fflag) {
if (realpath(argv[0], buf) == NULL)
exit(1);
} else {
if ((n = readlink(argv[0], buf, sizeof(buf) - 1)) < 0)
exit(1);
buf[n] = '\0';
}
printf("%s", buf);
if (!nflag)
putchar('\n');
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return 0;
}