/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2003, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * * $Id$ ***************************************************************************/ /* Escape and unescape URL encoding in strings. The functions return a new * allocated string or NULL if an error occurred. */ #include "setup.h" #include <ctype.h> #include <curl/curl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> /* The last #include file should be: */ #ifdef CURLDEBUG #include "memdebug.h" #endif char *curl_escape(const char *string, int length) { int alloc = (length?length:(int)strlen(string))+1; char *ns = malloc(alloc); char *testing_ptr = NULL; unsigned char in; int newlen = alloc; int index=0; length = alloc-1; while(length--) { in = *string; if(!(in >= 'a' && in <= 'z') && !(in >= 'A' && in <= 'Z') && !(in >= '0' && in <= '9')) { /* encode it */ newlen += 2; /* the size grows with two, since this'll become a %XX */ if(newlen > alloc) { alloc *= 2; testing_ptr = realloc(ns, alloc); if(!testing_ptr) { free( ns ); return NULL; } else { ns = testing_ptr; } } sprintf(&ns[index], "%%%02X", in); index+=3; } else { /* just copy this */ ns[index++]=in; } string++; } ns[index]=0; /* terminate it */ return ns; } #define ishex(in) ((in >= 'a' && in <= 'f') || \ (in >= 'A' && in <= 'F') || \ (in >= '0' && in <= '9')) char *curl_unescape(const char *string, int length) { int alloc = (length?length:(int)strlen(string))+1; char *ns = malloc(alloc); unsigned char in; int index=0; unsigned int hex; if( !ns ) { return NULL; } while(--alloc > 0) { in = *string; if(('%' == in) && ishex(string[1]) && ishex(string[2])) { /* this is two hexadecimal digits following a '%' */ char hexstr[3]; char *ptr; hexstr[0] = string[1]; hexstr[1] = string[2]; hexstr[2] = 0; hex = strtol(hexstr, &ptr, 16); in = hex; string+=2; alloc-=2; } ns[index++] = in; string++; } ns[index]=0; /* terminate it */ return ns; } /* For operating systems/environments that use different malloc/free ssystems for the app and for this library, we provide a free that uses the library's memory system */ void curl_free(void *p) { free(p); }