123 lines
3.3 KiB
C++
123 lines
3.3 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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ln.cpp
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Create a hard or symbolic link.
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*******************************************************************************/
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#if !defined(VERSIONSTR)
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#define VERSIONSTR "unknown version"
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#endif
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void Help(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION]... TARGET LINK_NAME\n", argv0);
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fprintf(fp, "Create a hard or symbolic link.\n");
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}
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void Version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
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fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
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fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
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}
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int main(int argc, char* argv[])
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{
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const char* argv0 = argv[0];
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bool force = false;
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bool symbolic = false;
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bool verbose = false;
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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for ( size_t i = 1; arg[i]; i++ )
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switch ( arg[i] )
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{
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case 'f': force = true; break;
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case 's': symbolic = true; break;
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case 'v': verbose = true; break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, arg[i]);
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Help(stderr, argv0);
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exit(1);
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}
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else if ( !strcmp(arg, "--force") )
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force = true;
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else if ( !strcmp(arg, "--symbolic") )
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symbolic = true;
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else if ( !strcmp(arg, "--verbose") )
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verbose = true;
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else if ( !strcmp(arg, "--help") ) { Help(stdout, argv0); exit(0); }
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else if ( !strcmp(arg, "--version") ) { Version(stdout, argv0); exit(0); }
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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Help(stderr, argv0);
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exit(1);
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}
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}
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for ( int i = 0; i < argc; i++ )
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while ( i < argc && !argv[i] )
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{
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for ( int n = i; n < argc; n++ )
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argv[n] = argv[n+1];
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argc--;
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}
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if ( argc != 3 )
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{
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const char* what = argc < 3 ? "missing" : "extra";
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fprintf(stderr, "%s: %s operand\n", argv0, what);
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Help(stderr, argv0);
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exit(1);
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}
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const char* oldname = argv[1];
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const char* newname = argv[2];
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if ( force )
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unlink(newname);
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int ret = (symbolic ? symlink : link)(oldname, newname);
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if ( ret == 0 )
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{
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if ( verbose )
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printf("`%s' => `%s'\n", newname, oldname);
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}
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else
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error(0, errno, "`%s' => `%s'", newname, oldname);
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return ret ? 1 : 0;
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}
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