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/*
* UNG's Not GNU
*
* Copyright (c) 2011-2019, Jakob Kaivo <jkk@ung.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _POSIX_C_SOURCE 200809L
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#ifndef O_SEARCH
#define O_SEARCH 0
#endif
static int ln(const char *path, int dirfd, const char *target, int sym, int force, int flag)
{
if (!target) {
target = path;
}
struct stat st;
if (fstatat(dirfd, target, &st, AT_SYMLINK_NOFOLLOW) == 0) {
if (!force) {
fprintf(stderr, "ln: %s: %s\n", target, strerror(EEXIST));
return 1;
}
if (unlinkat(dirfd, target, 0) != 0) {
fprintf(stderr, "ln: %s: %s\n", target, strerror(errno));
return 1;
}
}
if (sym) {
if (symlinkat(path, dirfd, target) != 0) {
fprintf(stderr, "ln: %s -> %s: %s\n", path, target, strerror(errno));
return 1;
}
} else {
if (linkat(AT_FDCWD, path, dirfd, target, flag) != 0) {
fprintf(stderr, "ln: %s -> %s: %s\n", path, target, strerror(errno));
return 1;
}
}
return 0;
}
int main(int argc, char *argv[])
{
setlocale(LC_ALL, "");
int flag = 0;
int symbolic = 0;
int force = 0;
int c;
while ((c = getopt(argc, argv, "fsLP")) != -1) {
switch (c) {
case 'L':
flag = AT_SYMLINK_FOLLOW;
break;
case 'P':
flag = 0;
break;
case 's':
symbolic = 1;
break;
case 'f':
force = 1;
break;
default:
return 1;
}
}
if (argc - optind < 2) {
fprintf(stderr, "ln: missing operands\n");
return 1;
}
char *target = argv[argc - 1];
int dirfd = open(target, O_SEARCH | O_DIRECTORY);
if (argc - optind == 2) {
if (dirfd == -1) {
dirfd = AT_FDCWD;
}
return ln(argv[optind], dirfd, target, symbolic, force, flag);
}
if (dirfd == -1) {
fprintf(stderr, "ln: %s: %s\n", target, strerror(errno));
}
int r = 0;
do {
r |= ln(argv[optind++], dirfd, NULL, symbolic, force, flag);
} while (optind < argc - 1);
return r;
}
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