126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
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/*
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* Copyright (c) Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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/*
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* This file provides common libc dependencies that zstd requires.
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* The purpose is to allow replacing this file with a custom implementation
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* to compile zstd without libc support.
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*/
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/* Need:
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* NULL
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* INT_MAX
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* UINT_MAX
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* ZSTD_memcpy()
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* ZSTD_memset()
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* ZSTD_memmove()
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*/
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#ifndef ZSTD_DEPS_COMMON
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#define ZSTD_DEPS_COMMON
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#define ZSTD_memcpy(d,s,n) __builtin_memcpy((d),(s),(n))
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#define ZSTD_memmove(d,s,n) __builtin_memmove((d),(s),(n))
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#define ZSTD_memset(d,s,n) __builtin_memset((d),(s),(n))
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#endif /* ZSTD_DEPS_COMMON */
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/*
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* Define malloc as always failing. That means the user must
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* either use ZSTD_customMem or statically allocate memory.
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* Need:
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* ZSTD_malloc()
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* ZSTD_free()
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* ZSTD_calloc()
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*/
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#ifdef ZSTD_DEPS_NEED_MALLOC
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#ifndef ZSTD_DEPS_MALLOC
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#define ZSTD_DEPS_MALLOC
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#define ZSTD_malloc(s) ({ (void)(s); NULL; })
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#define ZSTD_free(p) ((void)(p))
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#define ZSTD_calloc(n,s) ({ (void)(n); (void)(s); NULL; })
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#endif /* ZSTD_DEPS_MALLOC */
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#endif /* ZSTD_DEPS_NEED_MALLOC */
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/*
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* Provides 64-bit math support.
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* Need:
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* U64 ZSTD_div64(U64 dividend, U32 divisor)
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*/
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#ifdef ZSTD_DEPS_NEED_MATH64
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#ifndef ZSTD_DEPS_MATH64
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#define ZSTD_DEPS_MATH64
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#include <linux/math64.h>
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static uint64_t ZSTD_div64(uint64_t dividend, uint32_t divisor) {
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return div_u64(dividend, divisor);
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}
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#endif /* ZSTD_DEPS_MATH64 */
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#endif /* ZSTD_DEPS_NEED_MATH64 */
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/*
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* This is only requested when DEBUGLEVEL >= 1, meaning
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* it is disabled in production.
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* Need:
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* assert()
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*/
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#ifdef ZSTD_DEPS_NEED_ASSERT
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#ifndef ZSTD_DEPS_ASSERT
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#define ZSTD_DEPS_ASSERT
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#include <linux/kernel.h>
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#define assert(x) WARN_ON((x))
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#endif /* ZSTD_DEPS_ASSERT */
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#endif /* ZSTD_DEPS_NEED_ASSERT */
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/*
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* This is only requested when DEBUGLEVEL >= 2, meaning
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* it is disabled in production.
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* Need:
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* ZSTD_DEBUG_PRINT()
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*/
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#ifdef ZSTD_DEPS_NEED_IO
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#ifndef ZSTD_DEPS_IO
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#define ZSTD_DEPS_IO
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#include <linux/printk.h>
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#define ZSTD_DEBUG_PRINT(...) pr_debug(__VA_ARGS__)
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#endif /* ZSTD_DEPS_IO */
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#endif /* ZSTD_DEPS_NEED_IO */
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/*
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* Only requested when MSAN is enabled.
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* Need:
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* intptr_t
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*/
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#ifdef ZSTD_DEPS_NEED_STDINT
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#ifndef ZSTD_DEPS_STDINT
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#define ZSTD_DEPS_STDINT
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/*
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* The Linux Kernel doesn't provide intptr_t, only uintptr_t, which
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* is an unsigned long.
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*/
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typedef long intptr_t;
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#endif /* ZSTD_DEPS_STDINT */
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#endif /* ZSTD_DEPS_NEED_STDINT */
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