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b168057a | 1 | /* Copyright (C) 1996-2015 Free Software Foundation, Inc. |
33a934a3 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996. | |
75cd5204 | 4 | |
33a934a3 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
75cd5204 | 9 | |
33a934a3 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
75cd5204 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
75cd5204 RM |
18 | |
19 | #include "wcwidth.h" | |
20 | ||
21 | /* Determine number of column positions required for first N wide | |
22 | characters (or fewer if S ends before this) in S. */ | |
23 | int | |
24 | wcswidth (const wchar_t *s, size_t n) | |
25 | { | |
26 | int result = 0; | |
27 | ||
35946fb7 | 28 | while (n-- > 0 && *s != L'\0') |
75cd5204 RM |
29 | { |
30 | int now = internal_wcwidth (*s); | |
31 | if (now == -1) | |
32 | return -1; | |
33 | result += now; | |
34 | ++s; | |
35 | } | |
36 | ||
37 | return result; | |
38 | } |