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curl_easy_unescape(3)

curl_easy_unescape(3)           libcurl 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 *url,
                                int inlength, int *outlength);

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

       If the length argument is set to 0 (zero),  curl_easy_unescape(3)  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 re‐
       turned  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 very 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.

EXAMPLE
       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),RFC3986

libcurl 7.86.0                September 20, 2022         curl_easy_unescape(3)
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