mirror of
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221 lines
4.4 KiB
C
221 lines
4.4 KiB
C
/* `sln' program to create symbolic links between files.
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Copyright (C) 1998-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <error.h>
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#include <errno.h>
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#include <libintl.h>
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#include <locale.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include "../version.h"
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#define PACKAGE _libc_intl_domainname
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#if !defined S_ISDIR && defined S_IFDIR
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#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
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#endif
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static int makesymlink (const char *src, const char *dest);
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static int makesymlinks (const char *file);
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static void usage (void);
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int
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main (int argc, char **argv)
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{
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/* Set locale via LC_ALL. */
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setlocale (LC_ALL, "");
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/* Set the text message domain. */
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textdomain (PACKAGE);
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switch (argc)
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{
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case 2:
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if (strcmp (argv[1], "--version") == 0) {
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printf ("sln %s%s\n", PKGVERSION, VERSION);
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return 0;
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} else if (strcmp (argv[1], "--help") == 0) {
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usage ();
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return 0;
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}
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return makesymlinks (argv [1]);
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break;
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case 3:
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return makesymlink (argv [1], argv [2]);
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break;
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default:
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usage ();
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return 1;
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break;
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}
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}
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static void
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usage (void)
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{
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printf (_("Usage: sln src dest|file\n\n"));
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printf (_("For bug reporting instructions, please see:\n\
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%s.\n"), REPORT_BUGS_TO);
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}
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static int
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makesymlinks (file)
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const char *file;
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{
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#ifndef PATH_MAX
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#define PATH_MAX 4095
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#endif
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char *buffer = NULL;
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size_t bufferlen = 0;
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int ret;
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int lineno;
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FILE *fp;
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if (strcmp (file, "-") == 0)
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fp = stdin;
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else
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{
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fp = fopen (file, "r");
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if (fp == NULL)
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{
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fprintf (stderr, _("%s: file open error: %m\n"), file);
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return 1;
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}
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}
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ret = 0;
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lineno = 0;
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while (!feof_unlocked (fp))
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{
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ssize_t n = getline (&buffer, &bufferlen, fp);
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char *src;
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char *dest;
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char *cp = buffer;
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if (n < 0)
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break;
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if (buffer[n - 1] == '\n')
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buffer[n - 1] = '\0';
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++lineno;
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while (isspace (*cp))
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++cp;
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if (*cp == '\0')
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/* Ignore empty lines. */
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continue;
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src = cp;
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do
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++cp;
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while (*cp != '\0' && ! isspace (*cp));
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if (*cp != '\0')
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*cp++ = '\0';
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while (isspace (*cp))
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++cp;
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if (*cp == '\0')
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{
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fprintf (stderr, _("No target in line %d\n"), lineno);
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ret = 1;
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continue;
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}
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dest = cp;
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do
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++cp;
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while (*cp != '\0' && ! isspace (*cp));
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if (*cp != '\0')
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*cp++ = '\0';
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ret |= makesymlink (src, dest);
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}
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fclose (fp);
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return ret;
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}
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static int
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makesymlink (src, dest)
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const char *src;
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const char *dest;
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{
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struct stat stats;
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const char *error;
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/* Destination must not be a directory. */
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if (lstat (dest, &stats) == 0)
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{
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if (S_ISDIR (stats.st_mode))
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{
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fprintf (stderr, _("%s: destination must not be a directory\n"),
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dest);
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return 1;
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}
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else if (unlink (dest) && errno != ENOENT)
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{
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fprintf (stderr, _("%s: failed to remove the old destination\n"),
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dest);
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return 1;
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}
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}
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else if (errno != ENOENT)
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{
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error = strerror (errno);
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fprintf (stderr, _("%s: invalid destination: %s\n"), dest, error);
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return -1;
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}
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#ifdef S_ISLNK
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if (symlink (src, dest) == 0)
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#else
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if (link (src, dest) == 0)
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#endif
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{
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/* Destination must exist by now. */
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if (access (dest, F_OK))
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{
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error = strerror (errno);
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unlink (dest);
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fprintf (stderr, _("Invalid link from \"%s\" to \"%s\": %s\n"),
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src, dest, error);
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return 1;
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}
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return 0;
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}
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else
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{
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error = strerror (errno);
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fprintf (stderr, _("Invalid link from \"%s\" to \"%s\": %s\n"),
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src, dest, error);
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return 1;
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}
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}
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