Tribblix: manual page: curl_easy

curl_easy_unescape(3) Introduction to Library Functions

NAME

curl_easy_unescape - URL decode a 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

This functionality affects all supported protocols

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 curl 7.15.4

RETURN VALUE

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