wcsmbs/wcswidth.c

   1 /* Copyright (C) 1996-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include "wcwidth.h"
  19
  20 /* Determine number of column positions required for first N wide
  21    characters (or fewer if S ends before this) in S.  */
  22 int
  23 wcswidth (const wchar_t *s, size_t n)
  24 {
  25   int result = 0;
  26
  27   while (n-- > 0 && *s != L'\0')
  28     {
  29       int now = internal_wcwidth (*s);
  30       if (now == -1)
  31         return -1;
  32       result += now;
  33       ++s;
  34     }
  35
  36   return result;
  37 }