---
name: "wmemcmp"
section: "3"
platform: "linux"
package: "man-pages"
version: "6.19-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/wmemcmp"
---

# wmemcmp(3)

compare two arrays of wide-characters

## NAME

wmemcmp - compare two arrays of wide-characters

## LIBRARY

Standard C library (*libc*, *-lc*)

## SYNOPSIS

```
#include <wchar.h>
```

**int wmemcmp(**size\_t n;             **const wchar\_t** *s1***\[***n***\], const wchar\_t** *s2***\[***n***\], size\_t** *n***);**

## DESCRIPTION

The **wmemcmp**() function is the wide-character equivalent of the [**memcmp**(3)](/memcmp/3.md) function. It compares the *n* wide-characters starting at *s1* and the *n* wide-characters starting at *s2*.

## RETURN VALUE

The **wmemcmp**() function returns zero if the wide-character arrays of size *n* at *s1* and *s2* are equal. It returns an integer greater than zero if at the first differing position *i* (*i* \< *n*), the corresponding wide-character *s1\[i\]* is greater than *s2\[i\]*. It returns an integer less than zero if at the first differing position *i* (*i* \< *n*), the corresponding wide-character *s1\[i\]* is less than *s2\[i\]*.

## ATTRIBUTES

For an explanation of the terms used in this section, see [**attributes**(7)](/attributes/7.md).

| | | |
| --- | --- | --- |
| **Interface** | **Attribute** | **Value** |
| **wmemcmp**() | Thread safety | MT-Safe |

## STANDARDS

C11, POSIX.1-2008.

## HISTORY

POSIX.1-2001, C99.

## SEE ALSO

[**memcmp**(3)](/memcmp/3.md), [**wcscmp**(3)](/wcscmp/3.md)