printf/vasprintf.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 
00020 #include "printf.h"
00021 
00022 int _lucid_vasprintf(char **ptr, const char *fmt, va_list ap)
00023 {
00024         va_list ap2;
00025         int len;
00026         char *buf;
00027         
00028         /* don't consume the original ap, we'll need it again */
00029         va_copy(ap2, ap);
00030         
00031         /* get required size */
00032         len = _lucid_vsnprintf(0, 0, fmt, ap2);
00033         
00034         va_end(ap2);
00035         
00036         /* if size is 0, no buffer is allocated
00037         ** just set *ptr to NULL and return size */
00038         if (len > 0) {
00039                 if (!(buf = calloc(len + 1, sizeof(char))))
00040                         return -1;
00041                 
00042                 _lucid_vsnprintf(buf, len, fmt, ap);
00043                 
00044                 *ptr = buf;
00045         }
00046         
00047         return len;
00048 }

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