root/maint/gnulib/lib/unistr/u-strspn.h

/* */

INCLUDED FROM

DEFINITIONS

1. FUNC

   1 /* Search for some characters in UTF-8/UTF-16/UTF-32 string.
   2    Copyright (C) 1999, 2002, 2006, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   4 
   5    This file is free software.
   6    It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
   7    You can redistribute it and/or modify it under either
   8      - the terms of the GNU Lesser General Public License as published
   9        by the Free Software Foundation; either version 3, or (at your
  10        option) any later version, or
  11      - the terms of the GNU General Public License as published by the
  12        Free Software Foundation; either version 2, or (at your option)
  13        any later version, or
  14      - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
  15 
  16    This file is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License and the GNU General Public License
  20    for more details.
  21 
  22    You should have received a copy of the GNU Lesser General Public
  23    License and of the GNU General Public License along with this
  24    program.  If not, see <https://www.gnu.org/licenses/>.  */
  25 
  26 size_t
  27 FUNC (const UNIT *str, const UNIT *accept)
     /*  */
  28 {
  29   /* Optimize two cases.  */
  30   if (accept[0] == 0)
  31     return 0;
  32   {
  33     ucs4_t uc;
  34     int count = U_STRMBTOUC (&uc, accept);
  35     if (count >= 0 && accept[count] == 0)
  36       {
  37         const UNIT *ptr = str;
  38         for (; *ptr != 0; ptr += count)
  39           if (U_CMP (ptr, accept, count) != 0)
  40             break;
  41         return ptr - str;
  42       }
  43   }
  44   /* General case.  */
  45   {
  46     const UNIT *ptr = str;
  47 
  48     for (;;)
  49       {
  50         ucs4_t uc;
  51         int count = U_STRMBTOUC (&uc, ptr);
  52         if (count == 0)
  53           return ptr - str;
  54         if (count < 0)
  55           break;
  56         if (!U_STRCHR (accept, uc))
  57           return ptr - str;
  58         ptr += count;
  59       }
  60     return U_STRLEN (str);
  61   }
  62 }

/* */