144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2013.
|
|
|
|
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 <http://www.gnu.org/licenses/>.
|
|
|
|
ln.c
|
|
Create a hard or symbolic link.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <errno.h>
|
|
#include <error.h>
|
|
#include <fcntl.h>
|
|
#include <libgen.h>
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
static void compact_arguments(int* argc, char*** argv)
|
|
{
|
|
for ( int i = 0; i < *argc; i++ )
|
|
{
|
|
while ( i < *argc && !(*argv)[i] )
|
|
{
|
|
for ( int n = i; n < *argc; n++ )
|
|
(*argv)[n] = (*argv)[n+1];
|
|
(*argc)--;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void help(FILE* fp, const char* argv0)
|
|
{
|
|
fprintf(fp, "Usage: %s [OPTION]... TARGET LINK_NAME\n", argv0);
|
|
fprintf(fp, "Create a hard or symbolic link.\n");
|
|
}
|
|
|
|
static void version(FILE* fp, const char* argv0)
|
|
{
|
|
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
|
|
fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
|
|
fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
|
|
fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
const char* argv0 = argv[0];
|
|
bool force = false;
|
|
bool symbolic = false;
|
|
bool no_target_directory = false;
|
|
bool verbose = false;
|
|
for ( int i = 1; i < argc; i++ )
|
|
{
|
|
const char* arg = argv[i];
|
|
if ( arg[0] != '-' || !arg[1] )
|
|
continue;
|
|
argv[i] = NULL;
|
|
if ( !strcmp(arg, "--") )
|
|
break;
|
|
if ( arg[1] != '-' )
|
|
{
|
|
char c;
|
|
while ( (c = *++arg) ) switch ( c )
|
|
{
|
|
case 'f': force = true; break;
|
|
case 's': symbolic = true; break;
|
|
case 'T': no_target_directory = true; break;
|
|
case 'v': verbose = true; break;
|
|
default:
|
|
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
|
|
help(stderr, argv0);
|
|
exit(1);
|
|
}
|
|
}
|
|
else if ( !strcmp(arg, "--force") )
|
|
force = true;
|
|
else if ( !strcmp(arg, "--symbolic") )
|
|
symbolic = true;
|
|
else if ( !strcmp(arg, "--verbose") )
|
|
verbose = true;
|
|
else if ( !strcmp(arg, "--help") )
|
|
help(stdout, argv0), exit(0);
|
|
else if ( !strcmp(arg, "--version") )
|
|
version(stdout, argv0), exit(0);
|
|
else
|
|
{
|
|
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
|
|
help(stderr, argv0);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
compact_arguments(&argc, &argv);
|
|
|
|
if ( argc != 3 )
|
|
error(1, 0, "%s operand", argc < 3 ? "missing" : "extra");
|
|
|
|
const char* oldname = argv[1];
|
|
const char* newname = argv[2];
|
|
|
|
bool done = false;
|
|
again:
|
|
if ( force )
|
|
unlink(newname);
|
|
|
|
struct stat st;
|
|
int ret = (symbolic ? symlink : link)(oldname, newname);
|
|
if ( ret == 0 )
|
|
{
|
|
if ( verbose )
|
|
printf("`%s' => `%s'\n", newname, oldname);
|
|
}
|
|
else if ( !done && errno == EEXIST && !no_target_directory &&
|
|
lstat(newname, &st) == 0 && S_ISDIR(st.st_mode) )
|
|
{
|
|
char* oldnamecopy = strdup(oldname);
|
|
const char* name = basename(oldnamecopy);
|
|
char* newnewname;
|
|
asprintf(&newnewname, "%s/%s", newname, name);
|
|
free(oldnamecopy);
|
|
newname = newnewname;
|
|
done = true;
|
|
goto again;
|
|
}
|
|
else
|
|
error(0, errno, "`%s' => `%s'", newname, oldname);
|
|
return ret ? 1 : 0;
|
|
}
|