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dir: /doc/man3/strncmp.3/

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.TH strncmp 3
.SH NAME
strncmp - compare part of two strings
.SH SYNOPSIS
#include <string.h>

int strncmp(const char *s1, const char *s2, size_t n)
.SH DESCRIPTION
The
.BR strncmp ()
function compares not more than
.I n
characters
(characters that follow a null character are not compared)
from the array pointed to by
.I s1
to the array pointed to by
.IR s2 .
.PP
The value returned shall be used to determine
if a string is lexicographically
greater than, lesser than or equal to
the other string.
.SH RETURN VALUE
The
.BR strncmp ()
function shall return an integer greater than,
equal to, or lesser than 0,
if the string pointed to by
.I s1
is greater than,
equal to, or lesser than the string pointed to by
.IR s2 ,
respectively.
.PP
The function shall return 0 if
.I n
is equal to 0.
.SH STANDARDS
ISO/IEC 9899:1999 Section 7.21.4.4