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/* Hardware capability support for run-time dynamic loader. String splitting.
Copyright (C) 2020-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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 2.1 of the License, or (at your option) any later version.
The GNU C Library 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 the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dl-hwcaps.h>
#include <stdbool.h>
#include <string.h>
_Bool
_dl_hwcaps_split (struct dl_hwcaps_split *s)
{
if (s->segment == NULL)
return false;
/* Skip over the previous segment. */
s->segment += s->length;
/* Consume delimiters. This also avoids returning an empty
segment. */
while (*s->segment == ':')
++s->segment;
if (*s->segment == '\0')
return false;
/* This could use strchrnul, but we would have to link the function
into ld.so for that. */
const char *colon = strchr (s->segment, ':');
if (colon == NULL)
s->length = strlen (s->segment);
else
s->length = colon - s->segment;
return true;
}
_Bool
_dl_hwcaps_split_masked (struct dl_hwcaps_split_masked *s)
{
while (true)
{
if (!_dl_hwcaps_split (&s->split))
return false;
bool active = s->bitmask & 1;
s->bitmask >>= 1;
if (active && _dl_hwcaps_contains (s->mask,
s->split.segment, s->split.length))
return true;
}
}
_Bool
_dl_hwcaps_contains (const char *hwcaps, const char *name, size_t name_length)
{
if (hwcaps == NULL)
return true;
struct dl_hwcaps_split split;
_dl_hwcaps_split_init (&split, hwcaps);
while (_dl_hwcaps_split (&split))
if (split.length == name_length
&& memcmp (split.segment, name, name_length) == 0)
return true;
return false;
}
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