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curl_easy_unescape(3) libcurl Manual curl_easy_unescape(3)
curl_easy_unescape - URL decodes 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(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 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.
CURL *curl = curl_easy_init();
char *decoded = curl_easy_unescape(curl, "%63%75%72%6c", 12, &decodelen);
/* do not assume printf() works on the decoded data! */
/* ... */
Added in 7.15.4 and replaces the old curl_unescape(3) function.
A pointer to a null-terminated string or NULL if it failed.
libcurl 7.87.0 September 20, 2022 curl_easy_unescape(3)