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/* ln - link files
* Copyright (C) 2022 Ferass EL HAFIDI
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "version.h"
#ifndef COMPILETIME
#define COMPILETIME
#endif
int getopt(int argc, char *const argv[], const char *optstring);
void printUsage();
int main(int argc, char *const argv[]) {
int argument;
char param[256], *params = "s", *buffer;
if (argc == 1) {
printUsage();
return 1;
}
while ((argument = getopt(argc, argv, params)) != -1) {
if (argument == '?') {
printUsage();
return 1;
}
param[argument] = argument;
}
for (int i = 1; i < argc - 1; i++) {
if (argv[argc - 1][0] == '-') argc--;
if (argv[i][0] != '-') {
if (param['f']) remove(argv[argc - 1]);
if (param['s']) symlink(argv[i], argv[argc - 1]);
/* The -P option is the default behavior (at least on musl),
* so no if statement.
*/
else if (param['L']) {
readlink(argv[i], buffer, strlen(buffer)); /* Read the link */
if (errno) return errno;
link(buffer, argv[argc - 1]);
}
else link(argv[i], argv[argc - 1]);
if (errno) return errno;
}
}
return 0;
}
void printUsage() {
printf("Ferass' Base System. (%s)\n\n"
"Usage: ln [-fs] [-P|-L] source_file target_file\n\n"
"Link files.\n\n"
"\t-s\tCreate symbolic links instead of hard links\n"
"\t-f\tIf <target_file> exists, override the file\n"
"\t-P\tIf <source_file> names a symbolic link, create a hard link to the "
"symbolic link itself (default)\n"
"\t-L\tIf <source_file> names a symbolic link, create a hard link to the "
"file referenced by the symbolic link\n", COMPILETIME);
}
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