curl_easy_unescape - URL decode the given string
char *curl_easy_unescape( CURL * curl , const char * url , int inlength , int * outlength );
This function converts the given URL encoded input string 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 will use strlen() on the input url string to find out the size.
If outlength is non-NULL, the function will write the length of the returned string in the integer it points to. This allows an escaped string containing %00 to still get used properly after unescaping. 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 unescaped if the string length is returned in this parameter.
You must curl_free the returned string when you're done with it.
Added in 7.15.4 and replaces the old curl_unescape function.
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