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/*
* cpu_features_common.h - code shared by all lib/$arch/cpu_features.c
*
* Copyright 2020 Eric Biggers
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef LIB_CPU_FEATURES_COMMON_H
#define LIB_CPU_FEATURES_COMMON_H
#if defined(TEST_SUPPORT__DO_NOT_USE) && !defined(FREESTANDING)
# define _GNU_SOURCE 1 /* for strdup() and strtok_r() */
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
#endif
#include "lib_common.h"
struct cpu_feature {
u32 bit;
const char *name;
};
#if defined(TEST_SUPPORT__DO_NOT_USE) && !defined(FREESTANDING)
/* Disable any features that are listed in $LIBDEFLATE_DISABLE_CPU_FEATURES. */
static inline void
disable_cpu_features_for_testing(u32 *features,
const struct cpu_feature *feature_table,
size_t feature_table_length)
{
char *env_value, *strbuf, *p, *saveptr = NULL;
size_t i;
env_value = getenv("LIBDEFLATE_DISABLE_CPU_FEATURES");
if (!env_value)
return;
strbuf = strdup(env_value);
if (!strbuf)
abort();
p = strtok_r(strbuf, ",", &saveptr);
while (p) {
for (i = 0; i < feature_table_length; i++) {
if (strcmp(p, feature_table[i].name) == 0) {
*features &= ~feature_table[i].bit;
break;
}
}
if (i == feature_table_length) {
fprintf(stderr,
"unrecognized feature in LIBDEFLATE_DISABLE_CPU_FEATURES: \"%s\"\n",
p);
abort();
}
p = strtok_r(NULL, ",", &saveptr);
}
free(strbuf);
}
#else /* TEST_SUPPORT__DO_NOT_USE */
static inline void
disable_cpu_features_for_testing(u32 *features,
const struct cpu_feature *feature_table,
size_t feature_table_length)
{
}
#endif /* !TEST_SUPPORT__DO_NOT_USE */
#endif /* LIB_CPU_FEATURES_COMMON_H */
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