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38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/* Test whether a single-byte character is a hexadecimal digit.
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Copyright (C) 2025-2026 Free Software Foundation, Inc.
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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 2.1 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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/* Written by Bruno Haible <bruno@clisp.org>, 2025. */
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#include <config.h>
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/* Specification. */
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#include <ctype.h>
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int
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isxdigit_l (int c, _GL_UNUSED locale_t locale)
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{
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/* For consistency with isxdigit(), which is not locale dependent
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(see ISO C23 § 7.4.2.12). */
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return ((c >= '0' && c <= '9')
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#if 'A' == 0x41 && 'a' == 0x61
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/* Optimization, assuming ASCII */
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|| ((c & ~0x20) >= 'A' && (c & ~0x20) <= 'F')
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#else
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|| (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f')
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#endif
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);
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}
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