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  1. /*
  2. FUNCTION
  3.         <<wcsncmp>>---compare part of two wide-character strings
  4.  
  5. ANSI_SYNOPSIS
  6.         #include <wchar.h>
  7.         int wcsncmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);
  8.  
  9. TRAD_SYNOPSIS
  10.         int wcsncmp(<[s1]>, <[s2]>, <[n]>
  11.         const wchar_t *<[s1]>;
  12.         const wchar_t *<[s2]>;
  13.         size_t <[n]>;
  14.  
  15. DESCRIPTION
  16.         The <<wcsncmp>> function compares not more than <[n]> wide-character
  17.         codes (wide-character codes that follow a null wide-character code are
  18.         not compared) from the array pointed to by <[s1]> to the array pointed
  19.         to by <[s2]>.
  20.  
  21.         The sign of a non-zero return value is determined by the sign of the
  22.         difference between the values of the first pair of wide-character codes
  23.         that differ in the objects being compared.
  24.  
  25. RETURNS
  26.         Upon successful completion, <<wcsncmp>> returns an integer greater than,
  27.         equal to or less than 0, if the possibly null-terminated array pointed
  28.         to by <[s1]> is greater than, equal to or less than the possibly
  29.         null-terminated array pointed to by <[s2]> respectively.
  30.  
  31. PORTABILITY
  32. <<wcsncmp>> is ISO/IEC 9899/AMD1:1995 (ISO C).
  33.  
  34. No supporting OS subroutines are required.
  35. */
  36.  
  37. /*      $NetBSD$        */
  38.  
  39. /*
  40.  * Copyright (c) 1989, 1993
  41.  *      The Regents of the University of California.  All rights reserved.
  42.  *
  43.  * Redistribution and use in source and binary forms, with or without
  44.  * modification, are permitted provided that the following conditions
  45.  * are met:
  46.  * 1. Redistributions of source code must retain the above copyright
  47.  *    notice, this list of conditions and the following disclaimer.
  48.  * 2. Redistributions in binary form must reproduce the above copyright
  49.  *    notice, this list of conditions and the following disclaimer in the
  50.  *    documentation and/or other materials provided with the distribution.
  51.  * 3. Neither the name of the University nor the names of its contributors
  52.  *    may be used to endorse or promote products derived from this software
  53.  *    without specific prior written permission.
  54.  *
  55.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  56.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  57.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  58.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  59.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  60.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  61.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  62.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  63.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  64.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  65.  * SUCH DAMAGE.
  66.  */
  67.  
  68. #include <_ansi.h>
  69. #include <wchar.h>
  70.  
  71. int
  72. _DEFUN (wcsncmp, (s1, s2, n),
  73.         _CONST wchar_t * s1 _AND
  74.         _CONST wchar_t * s2 _AND
  75.         size_t n)
  76. {
  77.  
  78.   if (n == 0)
  79.     return (0);
  80.   do
  81.     {
  82.       if (*s1 != *s2++)
  83.         {
  84.           return (*s1 - *--s2);
  85.         }
  86.       if (*s1++ == 0)
  87.         break;
  88.     }
  89.   while (--n != 0);
  90.   return (0);
  91. }
  92.