printf/vasprintf.c

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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 "mem.h"
00018 #include "printf.h"
00019 
00020 int _lucid_vasprintf(char **ptr, const char *fmt, va_list ap)
00021 {
00022         va_list ap2;
00023         int len;
00024         char *buf;
00025 
00026         /* don't consume the original ap, we'll need it again */
00027         va_copy(ap2, ap);
00028 
00029         /* get required size */
00030         len = _lucid_vsnprintf(0, 0, fmt, ap2);
00031 
00032         va_end(ap2);
00033 
00034         /* if size is 0, no buffer is allocated
00035         ** just set *ptr to NULL and return size */
00036         if (len > 0) {
00037                 if (!(buf = mem_alloc(len + 1)))
00038                         return -1;
00039 
00040                 _lucid_vsnprintf(buf, len + 1, fmt, ap);
00041 
00042                 *ptr = buf;
00043         }
00044 
00045         return len;
00046 }

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