/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause *//* * Copyright (c) Meta Platforms, Inc. and affiliates. * All rights reserved. * * This source code is licensed under both the BSD-style license (found in the * LICENSE file in the root directory of this source tree) and the GPLv2 (found * in the COPYING file in the root directory of this source tree). * You may select, at your option, one of the above-listed licenses. */ /* * This file provides common libc dependencies that zstd requires. * The purpose is to allow replacing this file with a custom implementation * to compile zstd without libc support. */ /* Need: * NULL * INT_MAX * UINT_MAX * ZSTD_memcpy() * ZSTD_memset() * ZSTD_memmove() */#ifndef ZSTD_DEPS_COMMON#define ZSTD_DEPS_COMMON #include <linux/limits.h>#include <linux/stddef.h> #define ZSTD_memcpy(d,s,n) __builtin_memcpy((d),(s),(n))#define ZSTD_memmove(d,s,n) __builtin_memmove((d),(s),(n))#define ZSTD_memset(d,s,n) __builtin_memset((d),(s),(n)) #endif /* ZSTD_DEPS_COMMON */ /* * Define malloc as always failing. That means the user must * either use ZSTD_customMem or statically allocate memory. * Need: * ZSTD_malloc() * ZSTD_free() * ZSTD_calloc() */#ifdef ZSTD_DEPS_NEED_MALLOC#ifndef ZSTD_DEPS_MALLOC#define ZSTD_DEPS_MALLOC #define ZSTD_malloc(s) ({ (void)(s); NULL; })#define ZSTD_free(p) ((void)(p))#define ZSTD_calloc(n,s) ({ (void)(n); (void)(s); NULL; }) #endif /* ZSTD_DEPS_MALLOC */#endif /* ZSTD_DEPS_NEED_MALLOC */ /* * Provides 64-bit math support. * Need: * U64 ZSTD_div64(U64 dividend, U32 divisor) */#ifdef ZSTD_DEPS_NEED_MATH64#ifndef ZSTD_DEPS_MATH64#define ZSTD_DEPS_MATH64 #include <linux/math64.h> static uint64_t ZSTD_div64(uint64_t dividend, uint32_t divisor) {  return div_u64(dividend, divisor);} #endif /* ZSTD_DEPS_MATH64 */#endif /* ZSTD_DEPS_NEED_MATH64 */ /* * This is only requested when DEBUGLEVEL >= 1, meaning * it is disabled in production. * Need: * assert() */#ifdef ZSTD_DEPS_NEED_ASSERT#ifndef ZSTD_DEPS_ASSERT#define ZSTD_DEPS_ASSERT #include <linux/kernel.h> #define assert(x) WARN_ON(!(x)) #endif /* ZSTD_DEPS_ASSERT */#endif /* ZSTD_DEPS_NEED_ASSERT */ /* * This is only requested when DEBUGLEVEL >= 2, meaning * it is disabled in production. * Need: * ZSTD_DEBUG_PRINT() */#ifdef ZSTD_DEPS_NEED_IO#ifndef ZSTD_DEPS_IO#define ZSTD_DEPS_IO #include <linux/printk.h> #define ZSTD_DEBUG_PRINT(...) pr_debug(__VA_ARGS__) #endif /* ZSTD_DEPS_IO */#endif /* ZSTD_DEPS_NEED_IO */ /* * Only requested when MSAN is enabled. * Need: * intptr_t */#ifdef ZSTD_DEPS_NEED_STDINT#ifndef ZSTD_DEPS_STDINT#define ZSTD_DEPS_STDINT /* intptr_t already provided by ZSTD_DEPS_COMMON */ #endif /* ZSTD_DEPS_STDINT */#endif /* ZSTD_DEPS_NEED_STDINT */