misc/readsymlink.c

Go to the documentation of this file.
00001 // Copyright (C) 2006-2007 Benedikt Böhm <hollow@gentoo.org>
00002 //
00003 // This program is free software; you can redistribute it and/or
00004 // modify it under the terms of the GNU General Public License
00005 // as published by the Free Software Foundation; either version 2
00006 // of the License, or (at your option) any later version.
00007 //
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software
00015 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
00016 
00017 #include <unistd.h>
00018 
00019 #include "mem.h"
00020 #include "misc.h"
00021 
00022 #define CHUNKSIZE 128
00023 
00024 char *readsymlink(const char *path)
00025 {
00026         int chunks = 1, len = 0;
00027         char *buf = mem_alloc(chunks * CHUNKSIZE + 1);
00028 
00029         while (1) {
00030                 len = readlink(path, buf, chunks * CHUNKSIZE);
00031 
00032                 if (len == -1) {
00033                         mem_free(buf);
00034                         return NULL;
00035                 }
00036 
00037                 if (len >= chunks * CHUNKSIZE) {
00038                         chunks++;
00039                         buf = mem_realloc(buf, chunks * CHUNKSIZE + 1);
00040                 }
00041 
00042                 else
00043                         break;
00044         }
00045 
00046         buf[len] = '\0';
00047 
00048         return buf;
00049 }

Generated on Tue Jun 19 20:38:26 2007 for lucid by  doxygen 1.5.2