io/io_read_eof.c

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00001 // Copyright 2006 Benedikt Böhm <hollow@gentoo.org>
00002 //
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (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
00015 // Free Software Foundation, Inc.,
00016 // 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00017 
00018 #include <stdlib.h>
00019 #include <unistd.h>
00020 
00021 #include "io.h"
00022 #include "str.h"
00023 
00024 int io_read_eof(int fd, char **file)
00025 {
00026         int rc = -1;
00027         size_t chunks = 1, len = 0;
00028         char *buf = malloc(chunks * CHUNKSIZE + 1);
00029 
00030         for (;;) {
00031                 int bytes_read = read(fd, buf+len, CHUNKSIZE);
00032                 
00033                 if (bytes_read == -1)
00034                         goto err;
00035                 
00036                 len += bytes_read;
00037                 buf[len] = '\0';
00038                 
00039                 if (bytes_read == 0)
00040                         goto out;
00041                 
00042                 if (bytes_read == CHUNKSIZE) {
00043                         chunks++;
00044                         buf = realloc(buf, chunks * CHUNKSIZE + 1);
00045                 }
00046         }
00047         
00048 out:
00049         if (len > 0)
00050                 *file = str_dupn(buf, len);
00051         
00052         rc = len;
00053         
00054 err:
00055         free(buf);
00056         return rc;
00057 }

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