60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/* strncmp.c - string compare, string */
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/* Copyright 1992-1993 Wind River Systems, Inc. */
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/*
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modification history
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--------------------
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01c,25feb93,jdi documentation cleanup for 5.1.
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01b,20sep92,smb documentation additions
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01a,08jul92,smb written and documented.
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*/
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/*
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DESCRIPTION
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INCLUDE FILES: string.h
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SEE ALSO: American National Standard X3.159-1989
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NOMANUAL
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*/
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#include "vxWorks.h"
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#include "string.h"
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/*******************************************************************************
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*
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* strncmp - compare the first <n> characters of two strings (ANSI)
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*
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* This routine compares up to <n> characters of string <s1> to string <s2>
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* lexicographically.
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*
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* INCLUDE FILES: string.h
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*
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* RETURNS:
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* An integer greater than, equal to, or less than 0, according to whether
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* <s1> is lexicographically greater than, equal to, or less than <s2>,
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* respectively.
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*/
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int strncmp
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(
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const char * s1, /* string to compare */
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const char * s2, /* string to compare <s1> to */
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size_t n /* max no. of characters to compare */
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)
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{
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if (n == 0)
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return (0);
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while (*s1++ == *s2++)
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{
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if ((s1 [-1] == EOS) || (--n == 0))
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return (0);
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}
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return ((s1 [-1]) - (s2 [-1]));
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}
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