113 lines
3.0 KiB
C
113 lines
3.0 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) 2000, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* In order to be useful for every potential user, curl and libcurl are
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* dual-licensed under the MPL and the MIT/X-derivate licenses.
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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 MPL or the MIT/X-derivate
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* licenses. You may pick one of these licenses.
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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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/* The last #include file should be: */
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#ifdef MALLOCDEBUG
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#include "memdebug.h"
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#endif
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char *curl_escape(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 newlen = alloc;
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int index=0;
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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)
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ns[index++] = '+';
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else 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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ns = realloc(ns, alloc);
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if(!ns)
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return NULL;
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}
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sprintf(&ns[index], "%%%02X", in);
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index+=3;
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}
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else {
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/* just copy this */
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ns[index++]=in;
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}
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string++;
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}
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ns[index]=0; /* terminate it */
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return ns;
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}
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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 index=0;
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unsigned int hex;
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char querypart=FALSE; /* everything to the right of a '?' letter is
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the "query part" where '+' should become ' '.
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RFC 2316, section 3.10 */
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while(--alloc > 0) {
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in = *string;
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if(querypart && ('+' == in))
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in = ' ';
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else if(!querypart && ('?' == in)) {
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/* we have "walked in" to the query part */
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querypart=TRUE;
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}
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else if('%' == in) {
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/* encoded part */
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if(sscanf(string+1, "%02X", &hex)) {
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in = hex;
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string+=2;
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alloc-=2;
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}
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}
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ns[index++] = in;
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string++;
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}
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ns[index]=0; /* terminate it */
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return ns;
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}
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