NAME

       curl_easy_unescape - URL decode a string

SYNOPSIS

       #include <curl/curl.h>

       char *curl_easy_unescape(CURL *curl, const char *input,
                                int inlength, int *outlength);

DESCRIPTION

       This  function converts the URL encoded string input to a "plain string" and returns that in an allocated
       memory area. All input characters that are URL encoded (%XX where XX is a two-digit  hexadecimal  number)
       are converted to their binary versions.

       If  the  length argument is set to 0 (zero), curl_easy_unescape(3) uses strlen() on input to find out the
       size.

       If outlength is non-NULL, the function writes the length of the returned string in the integer it  points
       to.  This allows proper handling even for strings containing %00. Since this is a pointer to an int type,
       it can only return a value up to INT_MAX so no longer string can be returned in this parameter.

       Since 7.82.0, the curl parameter is ignored. Prior to that  there  was  per-handle  character  conversion
       support for some old operating systems such as TPF, but it was otherwise ignored.

       You must curl_free(3) the returned string when you are done with it.

PROTOCOLS

       This functionality affects all supported protocols

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           int decodelen;
           char *decoded = curl_easy_unescape(curl, "%63%75%72%6c", 12, &decodelen);
           if(decoded) {
             /* do not assume printf() works on the decoded data! */
             printf("Decoded: ");
             /* ... */
             curl_free(decoded);
           }
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in curl 7.15.4

RETURN VALUE

       A pointer to a null-terminated string or NULL if it failed.

SEE ALSO

       curl_easy_escape(3), curl_url_get(3)