/*
 * (C) 2009 Patrik Lembke
 * Licensed under GNU GPLv3 or newer as defined at 
 * http://www.gnu.org/licenses/gpl.txt
 *
 * An example hack that reverses all that is sent to printf (sadly
 * with no regard to what it reverses, so it both places newline oddly
 * and breakes widechars).
 *
 * gcc -o ld_printf.so -fpic -shared ld_printf.c
 * LD_PRELOAD="$( pwd )/ld_printf.so"
 * export LD_PRELOAD
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>

int printf( const char* fmt, ... )
{
    char* buff;
    char temp;
    int ret, x;

    va_list ap;
    va_start( ap, fmt );

    ret = vasprintf( &buff, fmt, ap );

    va_end( ap );

    /* flipp */
    for( x = 0; x < ret / 2; x++ )
    {
        temp = buff[(ret - x) -1];
        buff[(ret - x) -1] = buff[x];
        buff[x] = temp;
    }

    fprintf( stdout, buff );

    free( buff );
    return ret;
}