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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: curl_easy_unescape
Section: 3
Source: libcurl
See-also:
- curl_easy_escape (3)
- curl_free (3)
---
# NAME
curl_easy_unescape - URL decodes the given string
# SYNOPSIS
~~~c
#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.
# EXAMPLE
~~~c
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 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.
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