| /* Determine display width of UTF-16 string. |
| Copyright (C) 2001-2002, 2006-2007, 2009-2020 Free Software Foundation, Inc. |
| Written by Bruno Haible <bruno@clisp.org>, 2002. |
| |
| This program is free software: you can redistribute it and/or modify it |
| under the terms of the GNU Lesser 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include "uniwidth.h" |
| |
| #include "unistr.h" |
| |
| int |
| u16_width (const uint16_t *s, size_t n, const char *encoding) |
| { |
| const uint16_t *s_end = s + n; |
| int width = 0; |
| |
| while (s < s_end) |
| { |
| ucs4_t uc; |
| int w; |
| |
| s += u16_mbtouc_unsafe (&uc, s, s_end - s); |
| |
| if (uc == 0) |
| break; /* end of string reached */ |
| |
| w = uc_width (uc, encoding); |
| if (w >= 0) /* ignore control characters in the string */ |
| width += w; |
| } |
| |
| return width; |
| } |