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Diffstat (limited to 'newlib/libc/string/wcsncmp.c')
| -rw-r--r-- | newlib/libc/string/wcsncmp.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/newlib/libc/string/wcsncmp.c b/newlib/libc/string/wcsncmp.c new file mode 100644 index 000000000..1ced7e165 --- /dev/null +++ b/newlib/libc/string/wcsncmp.c @@ -0,0 +1,92 @@ +/* +FUNCTION + <<wcsncmp>>---compare part of two wide-character strings + +ANSI_SYNOPSIS + #include <wchar.h> + int wcsncmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>); + +TRAD_SYNOPSIS + int wcsncmp(<[s1]>, <[s2]>, <[n]> + const wchar_t *<[s1]>; + const wchar_t *<[s2]>; + size_t <[n]>; + +DESCRIPTION + The <<wcsncmp>> function compares not more than <[n]> wide-character + codes (wide-character codes that follow a null wide-character code are + not compared) from the array pointed to by <[s1]> to the array pointed + to by <[s2]>. + + The sign of a non-zero return value is determined by the sign of the + difference between the values of the first pair of wide-character codes + that differ in the objects being compared. + +RETURNS + Upon successful completion, <<wcsncmp>> returns an integer greater than, + equal to or less than 0, if the possibly null-terminated array pointed + to by <[s1]> is greater than, equal to or less than the possibly + null-terminated array pointed to by <[s2]> respectively. + +PORTABILITY +<<wcsncmp>> is ISO/IEC 9899/AMD1:1995 (ISO C). +No supporting OS subroutines are required. +*/ + +/* $NetBSD$ */ + +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <_ansi.h> +#include <wchar.h> + +int +_DEFUN (wcsncmp, (s1, s2, n), + _CONST wchar_t * s1 _AND + _CONST wchar_t * s2 _AND + size_t n) +{ + + if (n == 0) + return (0); + do + { + if (*s1 != *s2++) + { + /* XXX assumes wchar_t = short */ + return (*(_CONST unsigned short *) s1 - + *(_CONST unsigned short *) --s2); + } + if (*s1++ == 0) + break; + } + while (--n != 0); + return (0); +} |