mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-27 03:41:23 +08:00
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Hardware capability support for run-time dynamic loader. String splitting.
|
|
Copyright (C) 2020-2023 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;
|
|
}
|