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glibc/elf/sln.c
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/* `sln' program to create symbolic links between files. | |
Copyright (C) 1998-2016 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 Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifdef HAVE_CONFIG_H | |
# include "config.h" | |
#endif | |
#include <error.h> | |
#include <errno.h> | |
#include <libintl.h> | |
#include <locale.h> | |
#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> | |
#include "../version.h" | |
#define PACKAGE _libc_intl_domainname | |
#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); | |
static void usage (void); | |
int | |
main (int argc, char **argv) | |
{ | |
/* Set locale via LC_ALL. */ | |
setlocale (LC_ALL, ""); | |
/* Set the text message domain. */ | |
textdomain (PACKAGE); | |
switch (argc) | |
{ | |
case 2: | |
if (strcmp (argv[1], "--version") == 0) { | |
printf ("sln %s%s\n", PKGVERSION, VERSION); | |
return 0; | |
} else if (strcmp (argv[1], "--help") == 0) { | |
usage (); | |
return 0; | |
} | |
return makesymlinks (argv [1]); | |
break; | |
case 3: | |
return makesymlink (argv [1], argv [2]); | |
break; | |
default: | |
usage (); | |
return 1; | |
break; | |
} | |
} | |
static void | |
usage (void) | |
{ | |
printf (_("Usage: sln src dest|file\n\n")); | |
printf (_("For bug reporting instructions, please see:\n\ | |
%s.\n"), REPORT_BUGS_TO); | |
} | |
static int | |
makesymlinks (const char *file) | |
{ | |
#ifndef PATH_MAX | |
#define PATH_MAX 4095 | |
#endif | |
char *buffer = NULL; | |
size_t bufferlen = 0; | |
int ret; | |
int lineno; | |
FILE *fp; | |
if (strcmp (file, "-") == 0) | |
fp = stdin; | |
else | |
{ | |
fp = fopen (file, "r"); | |
if (fp == NULL) | |
{ | |
fprintf (stderr, _("%s: file open error: %m\n"), file); | |
return 1; | |
} | |
} | |
ret = 0; | |
lineno = 0; | |
while (!feof_unlocked (fp)) | |
{ | |
ssize_t n = getline (&buffer, &bufferlen, fp); | |
char *src; | |
char *dest; | |
char *cp = buffer; | |
if (n < 0) | |
break; | |
if (buffer[n - 1] == '\n') | |
buffer[n - 1] = '\0'; | |
++lineno; | |
while (isspace (*cp)) | |
++cp; | |
if (*cp == '\0') | |
/* Ignore empty lines. */ | |
continue; | |
src = cp; | |
do | |
++cp; | |
while (*cp != '\0' && ! isspace (*cp)); | |
if (*cp != '\0') | |
*cp++ = '\0'; | |
while (isspace (*cp)) | |
++cp; | |
if (*cp == '\0') | |
{ | |
fprintf (stderr, _("No target in line %d\n"), lineno); | |
ret = 1; | |
continue; | |
} | |
dest = cp; | |
do | |
++cp; | |
while (*cp != '\0' && ! isspace (*cp)); | |
if (*cp != '\0') | |
*cp++ = '\0'; | |
ret |= makesymlink (src, dest); | |
} | |
fclose (fp); | |
return ret; | |
} | |
static int | |
makesymlink (const char *src, const char *dest) | |
{ | |
struct stat64 stats; | |
const char *error; | |
/* Destination must not be a directory. */ | |
if (lstat64 (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; | |
} | |
} |