fchmod-tests, fchmodat tests, lchmod tests: Add more tests.
[gnulib.git] / lib / wcswidth-impl.h
blob0e2f9d58863167db846d46378143150ac8c38cc2
1 /* Determine number of screen columns needed for a size-bounded wide string.
2 Copyright (C) 1999, 2011-2021 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 1999.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program 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
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18 int
19 wcswidth (const wchar_t *s, size_t n)
21 int count = 0;
22 for (; n > 0; s++, n--)
24 wchar_t c = *s;
25 if (c == (wchar_t)'\0')
26 break;
28 int width = wcwidth (c);
29 if (width < 0)
30 goto found_nonprinting;
31 if (width > INT_MAX - count)
32 goto overflow;
33 count += width;
36 return count;
38 found_nonprinting:
39 return -1;
41 overflow:
42 return INT_MAX;