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 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
libcurl 7.81.0 December 06, 2021 curl_easy_unescape(3)
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