44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Determine number of screen columns needed for a size-bounded wide string.
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Copyright (C) 1999, 2011-2022 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 1999.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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int
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wcswidth (const wchar_t *s, size_t n)
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{
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int count = 0;
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for (; n > 0; s++, n--)
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{
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wchar_t c = *s;
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if (c == (wchar_t)'\0')
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break;
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{
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int width = wcwidth (c);
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if (width < 0)
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goto found_nonprinting;
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if (width > INT_MAX - count)
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goto overflow;
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count += width;
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}
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}
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return count;
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found_nonprinting:
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return -1;
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overflow:
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return INT_MAX;
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}
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