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sortix--sortix/libc/vsscanf.cpp

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
vsscanf.cpp
Input format conversion.
*******************************************************************************/
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
extern "C" int vsscanf(const char* str, const char* format, va_list ap)
{
const char* filename = "/ugly-vsscanf-hack";
FILE* fp = fopen(filename, "w+");
if ( !fp )
return -1;
int ret = -1;
size_t len = strlen(str);
if ( fwrite(str, sizeof(char), len, fp) == len )
if ( fseek(fp, 0, SEEK_SET) == 0 )
ret = vfscanf(fp, format, ap);
int savederrno = errno;
fclose(fp);
unlink(filename);
errno = savederrno;
return ret;
}