| /* Determine number of screen columns needed for a size-bounded wide string. |
| Copyright (C) 1999, 2011-2020 Free Software Foundation, Inc. |
| Written by Bruno Haible <bruno@clisp.org>, 1999. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| int |
| wcswidth (const wchar_t *s, size_t n) |
| { |
| int count = 0; |
| for (; n > 0; s++, n--) |
| { |
| wchar_t c = *s; |
| if (c == (wchar_t)'\0') |
| break; |
| { |
| int width = wcwidth (c); |
| if (width < 0) |
| goto found_nonprinting; |
| if (width > INT_MAX - count) |
| goto overflow; |
| count += width; |
| } |
| } |
| return count; |
| |
| found_nonprinting: |
| return -1; |
| |
| overflow: |
| return INT_MAX; |
| } |