sbase/ln.c

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/* See LICENSE file for copyright and license details. */
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#include <errno.h>
#include <fcntl.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
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#include <unistd.h>
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#include "util.h"
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static void
usage(void)
{
eprintf("usage: %1$s [-f] [-L | -P | -s] target [name]\n"
" %1$s [-f] [-L | -P | -s] target ... directory\n", argv0);
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}
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int
main(int argc, char *argv[])
{
char *fname, *to;
int sflag = 0;
int fflag = 0;
int hasto = 0;
int dirfd = AT_FDCWD;
int flags = AT_SYMLINK_FOLLOW;
struct stat st;
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ARGBEGIN {
case 'f':
fflag = 1;
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break;
case 's':
sflag = 1;
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break;
case 'L':
flags |= AT_SYMLINK_FOLLOW;
break;
case 'P':
flags &= ~AT_SYMLINK_FOLLOW;
break;
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default:
usage();
} ARGEND;
if (argc == 0)
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usage();
fname = sflag ? "symlink" : "link";
if (argc >= 2) {
if (stat(argv[argc - 1], &st) == 0 && S_ISDIR(st.st_mode)) {
if ((dirfd = open(argv[argc - 1], O_RDONLY)) < 0)
eprintf("open:");
} else if (argc == 2) {
to = argv[1];
hasto = 1;
} else {
eprintf("destination is not a directory\n");
}
argc--;
}
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for (; argc > 0; argc--, argv++) {
if (!hasto)
to = basename(argv[0]);
if (fflag)
unlinkat(dirfd, to, 0);
if ((!sflag ? linkat(AT_FDCWD, argv[0], dirfd, to, flags)
: symlinkat(argv[0], dirfd, to)) < 0) {
eprintf("%s %s <- %s:", fname, argv[0], to);
}
}
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return 0;
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}