strncmp.c
上传用户:nvosite88
上传日期:2007-01-17
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文件大小:1k
- /* strncmp.c - string compare, string */
- /* Copyright 1992-1993 Wind River Systems, Inc. */
- /*
- modification history
- --------------------
- 01c,25feb93,jdi documentation cleanup for 5.1.
- 01b,20sep92,smb documentation additions
- 01a,08jul92,smb written and documented.
- */
- /*
- DESCRIPTION
- INCLUDE FILES: string.h
- SEE ALSO: American National Standard X3.159-1989
- NOMANUAL
- */
- #include "vxWorks.h"
- #include "string.h"
- /*******************************************************************************
- *
- * strncmp - compare the first <n> characters of two strings (ANSI)
- *
- * This routine compares up to <n> characters of string <s1> to string <s2>
- * lexicographically.
- *
- * INCLUDE FILES: string.h
- *
- * RETURNS:
- * An integer greater than, equal to, or less than 0, according to whether
- * <s1> is lexicographically greater than, equal to, or less than <s2>,
- * respectively.
- */
- int strncmp
- (
- const char * s1, /* string to compare */
- const char * s2, /* string to compare <s1> to */
- size_t n /* max no. of characters to compare */
- )
- {
- if (n == 0)
- return (0);
- while (*s1++ == *s2++)
- {
- if ((s1 [-1] == EOS) || (--n == 0))
- return (0);
- }
- return ((s1 [-1]) - (s2 [-1]));
- }