io/io_read_eol.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_eol(int fd, char **line)
00025 {
00026         size_t chunks = 1, len = 0;
00027         char *buf = malloc(chunks * CHUNKSIZE + 1);
00028         char c;
00029 
00030         for (;;) {
00031                 switch(read(fd, &c, 1)) {
00032                 case -1:
00033                         return -1;
00034                 
00035                 case 0:
00036                         goto out;
00037                 
00038                 default:
00039                         if (c == '\n' || c == '\r')
00040                                 goto out;
00041                         
00042                         if (len >= chunks * CHUNKSIZE) {
00043                                 chunks++;
00044                                 buf = realloc(buf, chunks * CHUNKSIZE + 1);
00045                         }
00046                         
00047                         buf[len++] = c;
00048                         break;
00049                 }
00050         }
00051         
00052 out:
00053         if (len > 0)
00054                 *line = str_dupn(buf, len);
00055         
00056         free(buf);
00057         return len;
00058 }

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