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/* `sln' program to create symboblic links between files.
Copyright (C) 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#if !defined(S_ISDIR) && defined(S_IFDIR)
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
static int makesymlink (const char *src, const char *dest);
static int makesymlinks (const char *file);
int
main (int argc, char **argv)
{
switch (argc)
{
case 2:
return makesymlinks (argv [1]) == 0 ? 0 : 1;
break;
case 3:
return makesymlink (argv [1], argv [2]) == 0 ? 0 : 1;
break;
default:
printf ("Usage: %s src dest|file\n", argv [0]);
return 1;
break;
}
}
static int
makesymlinks (file)
const char *file;
{
#ifndef PATH_MAX
#define PATH_MAX 4095
#endif
char buffer [PATH_MAX * 4];
int i, ret, len;
int lineno;
const char *src;
const char *dest;
const char *error;
FILE *fp;
fp = fopen (file, "r");
if (fp == NULL)
{
error = strerror (errno);
fprintf (stderr, "%s: file open error: %s\n", file, error);
return -1;
}
ret = 0;
lineno = 0;
while (fgets (buffer, sizeof (buffer) - 1, fp))
{
lineno++;
src = dest = NULL;
buffer [sizeof (buffer) - 1] = '\0';
len = strlen (buffer);
for (i = 0; i < len && isspace (buffer [i]); i++);
if (i >= len)
{
fprintf (stderr, "Fail to parse line %d: \"%s\"\n", lineno,
buffer);
ret--;
continue;
}
src = &buffer [i];
for (; i < len && !isspace (buffer [i]); i++);
if (i < len)
{
buffer [i++] = '\0';
for (; i < len && isspace (buffer [i]); i++);
if (i >= len)
{
fprintf (stderr, "No target in line %d: \"%s\"\n", lineno,
buffer);
ret--;
continue;
}
dest = &buffer [i];
for (; i < len && !isspace (buffer [i]); i++);
buffer [i] = '\0';
}
else
{
fprintf (stderr, "No target in line %d: \"%s\"\n", lineno,
buffer);
ret--;
continue;
}
if (makesymlink (src, dest))
{
fprintf (stderr, "Failed to make link from \"%s\" to \"%s\" in line %d\n",
src, dest, lineno);
ret--;
}
}
fclose (fp);
return ret;
}
static int
makesymlink (src, dest)
const char *src;
const char *dest;
{
struct stat stats;
const char *error;
/* Destination must not be a directory. */
if (lstat (dest, &stats) == 0)
{
if (S_ISDIR (stats.st_mode))
{
fprintf (stderr, "%s: destination must not be a directory\n",
dest);
return -1;
}
else if (unlink (dest) && errno != ENOENT)
{
fprintf (stderr, "%s: failed to remove the old destination\n",
dest);
return -1;
}
}
else if (errno != ENOENT)
{
error = strerror (errno);
fprintf (stderr, "%s: invalid destination: %s\n", dest, error);
return -1;
}
#ifdef S_ISLNK
if (symlink (src, dest) == 0)
#else
if (link (src, dest) == 0)
#endif
{
/* Destination must exist by now. */
if (access (dest, F_OK))
{
error = strerror (errno);
unlink (dest);
fprintf (stderr, "Invalid link from \"%s\" to \"%s\": %s\n",
src, dest, error);
return -1;
}
return 0;
}
else
{
error = strerror (errno);
fprintf (stderr, "Invalid link from \"%s\" to \"%s\": %s\n",
src, dest, error);
return -1;
}
}
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