1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
22 ***************************************************************************/
24 /* Escape and unescape URL encoding in strings. The functions return a new
25 * allocated string or NULL if an error occurred. */
29 #include <curl/curl.h>
34 #include "curl_memory.h"
35 /* urldata.h and easyif.h are included for Curl_convert_... prototypes */
40 #define _MPRINTF_REPLACE /* use our functions only */
41 #include <curl/mprintf.h>
43 /* The last #include file should be: */
46 /* Portable character check (remember EBCDIC). Do not use isalnum() because
47 its behavior is altered by the current locale. */
48 static bool Curl_isalnum(unsigned char in)
51 case '0': case '1': case '2': case '3': case '4':
52 case '5': case '6': case '7': case '8': case '9':
53 case 'a': case 'b': case 'c': case 'd': case 'e':
54 case 'f': case 'g': case 'h': case 'i': case 'j':
55 case 'k': case 'l': case 'm': case 'n': case 'o':
56 case 'p': case 'q': case 'r': case 's': case 't':
57 case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
58 case 'A': case 'B': case 'C': case 'D': case 'E':
59 case 'F': case 'G': case 'H': case 'I': case 'J':
60 case 'K': case 'L': case 'M': case 'N': case 'O':
61 case 'P': case 'Q': case 'R': case 'S': case 'T':
62 case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
70 /* for ABI-compatibility with previous versions */
71 char *curl_escape(const char *string, int inlength)
73 return curl_easy_escape(NULL, string, inlength);
76 /* for ABI-compatibility with previous versions */
77 char *curl_unescape(const char *string, int length)
79 return curl_easy_unescape(NULL, string, length, NULL);
82 char *curl_easy_escape(CURL *handle, const char *string, int inlength)
84 size_t alloc = (inlength?(size_t)inlength:strlen(string))+1;
86 char *testing_ptr = NULL;
87 unsigned char in; /* we need to treat the characters unsigned */
88 size_t newlen = alloc;
92 #ifndef CURL_DOES_CONVERSIONS
93 /* avoid compiler warnings */
104 if (Curl_isalnum(in)) {
110 newlen += 2; /* the size grows with two, since this'll become a %XX */
113 testing_ptr = realloc(ns, alloc);
123 #ifdef CURL_DOES_CONVERSIONS
124 /* escape sequences are always in ASCII so convert them on non-ASCII hosts */
126 (Curl_convert_to_network(handle, &in, 1) != CURLE_OK)) {
127 /* Curl_convert_to_network calls failf if unsuccessful */
131 #endif /* CURL_DOES_CONVERSIONS */
133 snprintf(&ns[strindex], 4, "%%%02X", in);
139 ns[strindex]=0; /* terminate it */
144 * Unescapes the given URL escaped string of given length. Returns a
145 * pointer to a malloced string with length given in *olen.
146 * If length == 0, the length is assumed to be strlen(string).
147 * If olen == NULL, no output length is stored.
149 char *curl_easy_unescape(CURL *handle, const char *string, int length,
152 int alloc = (length?length:(int)strlen(string))+1;
153 char *ns = malloc(alloc);
158 #ifndef CURL_DOES_CONVERSIONS
159 /* avoid compiler warnings */
167 if(('%' == in) && ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
168 /* this is two hexadecimal digits following a '%' */
171 hexstr[0] = string[1];
172 hexstr[1] = string[2];
175 hex = strtoul(hexstr, &ptr, 16);
177 in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */
179 #ifdef CURL_DOES_CONVERSIONS
180 /* escape sequences are always in ASCII so convert them on non-ASCII hosts */
182 (Curl_convert_from_network(handle, &in, 1) != CURLE_OK)) {
183 /* Curl_convert_from_network calls failf if unsuccessful */
187 #endif /* CURL_DOES_CONVERSIONS */
196 ns[strindex]=0; /* terminate it */
199 /* store output size */
204 /* For operating systems/environments that use different malloc/free
205 systems for the app and for this library, we provide a free that uses
206 the library's memory system */
207 void curl_free(void *p)