urldecode.c
1.48 KB
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/**
* \file
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2014 Georg Hopp
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include "hexmap.h"
/**
* Decode an url encoded string. This expects a valid url
* encoded string and it size as arguments, else the behaviour
* of this function is undefined.
* This function modifies the data in buffer. No copy is made.
* The reason for this is only performance.
*/
size_t
TR_urldecode(char * buffer, size_t nbuffer)
{
char * buf_ptr = buffer;
char * res_ptr = buffer;
for(; 0 < nbuffer; nbuffer--, buf_ptr++, res_ptr++) {
switch(*buf_ptr) {
case '%':
*res_ptr = HEXVAL(&(buf_ptr[1]));
buf_ptr += 2;
nbuffer -= 2;
break;
case '+':
*buf_ptr = ' ';
/* intended drop through */
default:
*res_ptr = *buf_ptr;
break;
}
}
return res_ptr - buffer;
}
// vim: set ft=c ts=4 sw=4: