78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Hardware capability support for run-time dynamic loader. String splitting.
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Copyright (C) 2020-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dl-hwcaps.h>
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#include <stdbool.h>
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#include <string.h>
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_Bool
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_dl_hwcaps_split (struct dl_hwcaps_split *s)
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{
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if (s->segment == NULL)
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return false;
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/* Skip over the previous segment. */
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s->segment += s->length;
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/* Consume delimiters. This also avoids returning an empty
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segment. */
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while (*s->segment == ':')
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++s->segment;
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if (*s->segment == '\0')
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return false;
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/* This could use strchrnul, but we would have to link the function
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into ld.so for that. */
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const char *colon = strchr (s->segment, ':');
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if (colon == NULL)
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s->length = strlen (s->segment);
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else
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s->length = colon - s->segment;
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return true;
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}
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_Bool
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_dl_hwcaps_split_masked (struct dl_hwcaps_split_masked *s)
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{
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while (true)
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{
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if (!_dl_hwcaps_split (&s->split))
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return false;
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bool active = s->bitmask & 1;
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s->bitmask >>= 1;
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if (active && _dl_hwcaps_contains (s->mask,
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s->split.segment, s->split.length))
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return true;
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}
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}
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_Bool
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_dl_hwcaps_contains (const char *hwcaps, const char *name, size_t name_length)
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{
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if (hwcaps == NULL)
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return true;
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struct dl_hwcaps_split split;
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_dl_hwcaps_split_init (&split, hwcaps);
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while (_dl_hwcaps_split (&split))
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if (split.length == name_length
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&& memcmp (split.segment, name, name_length) == 0)
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return true;
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return false;
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}
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