curl_unescape(3) - Man pages

curl_unescape(3)            Library Functions Manual           curl_unescape(3)

NAME
       curl_unescape - URL decode a string

SYNOPSIS
       #include <curl/curl.h>

       char *curl_unescape(const char *input, int length);

DESCRIPTION
       Deprecated. Use curl_easy_unescape(3) instead.

       This  function converts the URL encoded string input to a "plain string"
       and return that as a new allocated string. All input characters that are
       URL encoded (%XX where XX is a two-digit hexadecimal  number)  are  con-
       verted to their plain text versions.

       If  the  length argument is set to 0, curl_unescape(3) calls strlen() on
       input to find out the size.

       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) {
           char *decoded = curl_unescape("%63%75%72%6c", 12);
           if(decoded) {
             /* do not assume printf() works on the decoded data */
             printf("Decoded: ");
             /* ... */
             curl_free(decoded);
           }
         }
       }

DEPRECATED
       Since 7.15.4, curl_easy_unescape(3) should be used. This function  might
       be removed in a future release.

AVAILABILITY
       Added in curl 7.1

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

SEE ALSO
       RFC2396, curl_easy_escape(3), curl_easy_unescape(3), curl_free(3)

libcurl                            2026-07-12                  curl_unescape(3)

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