text: /* Search character in UTF-16 string.
     Copyright (C) 1999, 2002, 2006-2007, 2009-2018 Free Software Foundation,
     Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2002.
  
     This program is free software: you can redistribute it and/or modify it
     under the terms of the GNU Lesser General Public License as published
     by the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "unistr.h"
  
  uint16_t *
  u16_strchr (const uint16_t *s, ucs4_t uc)
  {
    uint16_t c[2];
  
    if (uc < 0x10000)
      {
        uint16_t c0 = uc;
  
        for (;; s++)
          {
            if (*s == c0)
              break;
            if (*s == 0)
              goto notfound;
          }
        return (uint16_t *) s;
      }
    else
      switch (u16_uctomb_aux (c, uc, 2))
        {
        case 2:
          if (*s == 0)
            goto notfound;
          {
            uint16_t c0 = c[0];
            uint16_t c1 = c[1];
  
            for (;; s++)
              {
                if (s[1] == 0)
                  goto notfound;
                if (*s == c0 && s[1] == c1)
                  break;
              }
            return (uint16_t *) s;
          }
        }
  notfound:
    return NULL;
  }
  