diff options
Diffstat (limited to 'elf/sln.c')
| -rw-r--r-- | elf/sln.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/elf/sln.c b/elf/sln.c new file mode 100644 index 0000000..a958bac --- /dev/null +++ b/elf/sln.c @@ -0,0 +1,190 @@ +/* `sln' program to create symboblic links between files. + Copyright (C) 1998 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 __P ((const char *src, const char *dest)); +static int makesymlinks __P ((const char *file)); + +int +main (argc, argv) + 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; + } +} |