wcsmbs/wcswidth.c

   1 /* Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include "wcwidth.h"
  21
  22 /* Determine number of column positions required for first N wide
  23    characters (or fewer if S ends before this) in S.  */
  24 int
  25 wcswidth (const wchar_t *s, size_t n)
  26 {
  27   int result = 0;
  28
  29   while (n-- > 0 && *s != L'\0')
  30     {
  31       int now = internal_wcwidth (*s);
  32       if (now == -1)
  33         return -1;
  34       result += now;
  35       ++s;
  36     }
  37
  38   return result;
  39 }