curl_easy_unescape - Man Page

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 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) 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(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

Referenced By

curl_easy_escape(3), curl_free(3), curl_getdate(3), curl_unescape(3).

December 06, 2021 libcurl 7.81.0 libcurl Manual