1 /* Copyright (C) 1996-2022 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
wcswidth(const wchar_t * s,size_t n)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 }
38