132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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/* Escape and unescape URL encoding in strings. The functions return a new
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* allocated string or NULL if an error occurred. */
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#include "setup.h"
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#include <ctype.h>
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#include <curl/curl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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char *curl_escape(const char *string, int length)
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{
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size_t alloc = (length?(size_t)length:strlen(string))+1;
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char *ns;
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char *testing_ptr = NULL;
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unsigned char in;
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size_t newlen = alloc;
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int strindex=0;
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ns = malloc(alloc);
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if(!ns)
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return NULL;
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length = alloc-1;
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while(length--) {
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in = *string;
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if(!(in >= 'a' && in <= 'z') &&
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!(in >= 'A' && in <= 'Z') &&
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!(in >= '0' && in <= '9')) {
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/* encode it */
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newlen += 2; /* the size grows with two, since this'll become a %XX */
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if(newlen > alloc) {
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alloc *= 2;
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testing_ptr = realloc(ns, alloc);
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if(!testing_ptr) {
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free( ns );
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return NULL;
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}
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else {
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ns = testing_ptr;
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}
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}
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snprintf(&ns[strindex], 4, "%%%02X", in);
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strindex+=3;
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}
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else {
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/* just copy this */
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ns[strindex++]=in;
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}
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string++;
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}
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ns[strindex]=0; /* terminate it */
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return ns;
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}
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#define ishex(in) ((in >= 'a' && in <= 'f') || \
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(in >= 'A' && in <= 'F') || \
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(in >= '0' && in <= '9'))
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char *curl_unescape(const char *string, int length)
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{
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int alloc = (length?length:(int)strlen(string))+1;
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char *ns = malloc(alloc);
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unsigned char in;
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int strindex=0;
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long hex;
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if( !ns )
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return NULL;
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while(--alloc > 0) {
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in = *string;
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if(('%' == in) && ishex(string[1]) && ishex(string[2])) {
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/* this is two hexadecimal digits following a '%' */
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char hexstr[3];
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char *ptr;
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hexstr[0] = string[1];
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hexstr[1] = string[2];
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hexstr[2] = 0;
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hex = strtol(hexstr, &ptr, 16);
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in = (unsigned char)hex; /* this long is never bigger than 255 anyway */
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string+=2;
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alloc-=2;
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}
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ns[strindex++] = in;
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string++;
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}
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ns[strindex]=0; /* terminate it */
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return ns;
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}
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/* For operating systems/environments that use different malloc/free
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ssystems for the app and for this library, we provide a free that uses
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the library's memory system */
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void curl_free(void *p)
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{
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if(p)
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free(p);
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}
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