---
name: "ustrncmp"
section: "3alleg"
platform: "linux"
package: "liballegro-doc"
version: "2:4.2.2-2.2"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://carta.tech/man/ustrncmp"
---

# ustrncmp(3alleg)

Compares up to n letters of two strings. Allegro game programming library.

## NAME

ustrncmp - Compares up to n letters of two strings. Allegro game programming library.

## SYNOPSIS

**#include \<allegro.h\>**

**int ustrncmp(const char \*s1, const char \*s2, int n);**

## DESCRIPTION

This function compares up to \`n' characters of \`s1' and \`s2'. Example:

```
   if (ustrncmp(prefix, long_string, ustrlen(prefix)) == 0) {
      /* long_string starts with prefix */
   }
```

## RETURN VALUE

Returns zero if the substrings are equal, a positive number if \`s1' comes after \`s2' in the ASCII collating sequence, else a negative number.

## SEE ALSO

[**uconvert**(3alleg)](/man/uconvert/3alleg.md), [**ustrsize**(3alleg)](/man/ustrsize/3alleg.md), [**ustrsizez**(3alleg)](/man/ustrsizez/3alleg.md), [**ustrcmp**(3alleg)](/man/ustrcmp/3alleg.md), [**ustricmp**(3alleg)](/man/ustricmp/3alleg.md), [**ustrnicmp**(3alleg)](/man/ustrnicmp/3alleg.md)