newlib/libc/string/wcsspn.c

   1 /*
   2 FUNCTION
   3         <<wcsspn>>---get length of a wide substring
   4
   5 SYNOPSIS
   6         #include <wchar.h>
   7         size_t wcsspn(const wchar_t *<[s]>, const wchar_t *<[set]>);
   8
   9 DESCRIPTION
  10         The <<wcsspn>> function computes the length of the maximum initial
  11         segment of the wide-character string pointed to by <[s]> which consists
  12         entirely of wide-character codes from the wide-character string
  13         pointed to by <[set]>.
  14
  15 RETURNS
  16         The wcsspn() function returns the length <[s1]>; no return value is
  17         reserved to indicate an error.
  18
  19 PORTABILITY
  20 <<wcsspn>> is ISO/IEC 9899/AMD1:1995 (ISO C).
  21
  22 No supporting OS subroutines are required.
  23 */
  24
  25 /*      $NetBSD: wcsspn.c,v 1.1 2000/12/23 23:14:37 itojun Exp $        */
  26
  27 /*-
  28  * Copyright (c)1999 Citrus Project,
  29  * All rights reserved.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  *      citrus Id: wcsspn.c,v 1.1 1999/12/29 21:47:45 tshiozak Exp
  53  */
  54
  55 #include <_ansi.h>
  56 #include <wchar.h>
  57
  58 size_t
  59 wcsspn (const wchar_t * s,
  60         const wchar_t * set)
  61 {
  62   const wchar_t *p;
  63   const wchar_t *q;
  64
  65   p = s;
  66   while (*p)
  67     {
  68       q = set;
  69       while (*q)
  70         {
  71           if (*p == *q)
  72             break;
  73           q++;
  74         }
  75       if (!*q)
  76         goto done;
  77       p++;
  78     }
  79
  80 done:
  81   return (p - s);
  82 }