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Collin Funk
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* Determine display width of UTF-8 string.
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Copyright (C) 2001-2002, 2006-2007, 2009-2026 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2002.
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This file is free software.
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It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
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You can redistribute it and/or modify it under either
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- the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3, or (at your
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option) any later version, or
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- the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version, or
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- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License and the GNU General Public License
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for more details.
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You should have received a copy of the GNU Lesser General Public
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License and of the GNU General Public License along with this
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program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include "uniwidth.h"
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#include "unistr.h"
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int
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u8_width (const uint8_t *s, size_t n, const char *encoding)
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{
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const uint8_t *s_end = s + n;
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int width = 0;
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while (s < s_end)
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{
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ucs4_t uc;
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s += u8_mbtouc_unsafe (&uc, s, s_end - s);
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if (uc == 0)
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break; /* end of string reached */
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int w = uc_width (uc, encoding);
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if (w >= 0) /* ignore control characters in the string */
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width += w;
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}
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return width;
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}
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