curl_easy_unescape(3)      Library Functions Manual      curl_easy_unescape(3)

NAME
       curl_easy_unescape - URL decodes the given 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
       All

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 7.15.4 and replaces the old curl_unescape(3) function.

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

SEE ALSO
       curl_easy_escape(3), curl_free(3)

libcurl                          April 26 2024           curl_easy_unescape(3)