mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 16:14:16 +01:00
ef9ba2d912
- Changed the name of the LFS_CONFIG macro to LFS_UTIL to avoid confusion with the lfs_config struct. This also hints that LFS_UTIL is related to lfs_util.h. LFS_UTIL allows the user to override lfs_util.h so they can provide their own system-level dependencies such as malloc, tracing, builtins, stdint definitions, string.h, and others. - Removed stdlib includes from lfs.h, these should all go through lfs_util.h to let users override these definitions if stdlib is unavailable on their system. - Moved error code definitions to lfs_util.h. This lets users override the error codes to replace them with their own error codes and avoid a translation layer in some situations. Note the error codes must still be in the range of a negative int. - Used proper stdint definitions in lfs_scmp.
257 lines
7.9 KiB
C
257 lines
7.9 KiB
C
/*
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* lfs utility functions
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*
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* Copyright (c) 2017, Arm Limited. All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Can be overridden by users with their own configuration by defining
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* LFS_UTIL as a header file (-DLFS_UTIL=my_lfs_util.h)
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*
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* If LFS_UTIL is defined, none of the default definitions will be
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* emitted and must be provided by the user's header file. To start, I would
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* suggest copying lfs_util.h and modifying as needed.
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*/
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#ifndef LFS_UTIL_H
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#define LFS_UTIL_H
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#ifdef LFS_UTIL
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#define LFS_STRINGIZE(x) LFS_STRINGIZE2(x)
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#define LFS_STRINGIZE2(x) #x
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#include LFS_STRINGIZE(LFS_UTIL)
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#else
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// System includes
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <inttypes.h>
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#ifndef LFS_NO_MALLOC
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#include <stdlib.h>
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#endif
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#ifndef LFS_NO_ASSERT
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#include <assert.h>
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#endif
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#if !defined(LFS_NO_DEBUG) || \
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!defined(LFS_NO_WARN) || \
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!defined(LFS_NO_ERROR) || \
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defined(LFS_YES_TRACE)
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#include <stdio.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Possible error codes, these are negative to allow valid positive
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// return values. May be redefined to system-specific error codes as long
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// as they fit in a negative integer.
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enum lfs_error {
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LFS_ERR_OK = 0, // No error
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LFS_ERR_IO = -5, // Error during device operation
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LFS_ERR_CORRUPT = -84, // Corrupted
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LFS_ERR_NOENT = -2, // No directory entry
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LFS_ERR_EXIST = -17, // Entry already exists
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LFS_ERR_NOTDIR = -20, // Entry is not a dir
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LFS_ERR_ISDIR = -21, // Entry is a dir
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LFS_ERR_NOTEMPTY = -39, // Dir is not empty
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LFS_ERR_BADF = -9, // Bad file number
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LFS_ERR_FBIG = -27, // File too large
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LFS_ERR_INVAL = -22, // Invalid parameter
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LFS_ERR_NOSPC = -28, // No space left on device
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LFS_ERR_NOMEM = -12, // No more memory available
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LFS_ERR_NOATTR = -61, // No data/attr available
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LFS_ERR_NAMETOOLONG = -36, // File name too long
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};
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// Macros, may be replaced by system specific wrappers. Arguments to these
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// macros must not have side-effects as the macros can be removed for a smaller
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// code footprint
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// Logging functions
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#ifdef LFS_YES_TRACE
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#define LFS_TRACE_(fmt, ...) \
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printf("%s:%d:trace: " fmt "%s\n", __FILE__, __LINE__, __VA_ARGS__)
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#define LFS_TRACE(...) LFS_TRACE_(__VA_ARGS__, "")
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#else
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#define LFS_TRACE(...)
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#endif
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#ifndef LFS_NO_DEBUG
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#define LFS_DEBUG_(fmt, ...) \
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printf("%s:%d:debug: " fmt "%s\n", __FILE__, __LINE__, __VA_ARGS__)
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#define LFS_DEBUG(...) LFS_DEBUG_(__VA_ARGS__, "")
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#else
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#define LFS_DEBUG(...)
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#endif
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#ifndef LFS_NO_WARN
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#define LFS_WARN_(fmt, ...) \
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printf("%s:%d:warn: " fmt "%s\n", __FILE__, __LINE__, __VA_ARGS__)
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#define LFS_WARN(...) LFS_WARN_(__VA_ARGS__, "")
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#else
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#define LFS_WARN(...)
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#endif
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#ifndef LFS_NO_ERROR
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#define LFS_ERROR_(fmt, ...) \
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printf("%s:%d:error: " fmt "%s\n", __FILE__, __LINE__, __VA_ARGS__)
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#define LFS_ERROR(...) LFS_ERROR_(__VA_ARGS__, "")
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#else
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#define LFS_ERROR(...)
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#endif
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// Runtime assertions
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#ifndef LFS_NO_ASSERT
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#define LFS_ASSERT(test) assert(test)
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#else
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#define LFS_ASSERT(test)
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#endif
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// Builtin functions, these may be replaced by more efficient
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// toolchain-specific implementations. LFS_NO_INTRINSICS falls back to a more
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// expensive basic C implementation for debugging purposes
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// Min/max functions for unsigned 32-bit numbers
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static inline uint32_t lfs_max(uint32_t a, uint32_t b) {
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return (a > b) ? a : b;
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}
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static inline uint32_t lfs_min(uint32_t a, uint32_t b) {
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return (a < b) ? a : b;
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}
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// Align to nearest multiple of a size
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static inline uint32_t lfs_aligndown(uint32_t a, uint32_t alignment) {
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return a - (a % alignment);
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}
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static inline uint32_t lfs_alignup(uint32_t a, uint32_t alignment) {
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return lfs_aligndown(a + alignment-1, alignment);
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}
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// Find the smallest power of 2 greater than or equal to a
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static inline uint32_t lfs_npw2(uint32_t a) {
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#if !defined(LFS_NO_INTRINSICS) && (defined(__GNUC__) || defined(__CC_ARM))
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return 32 - __builtin_clz(a-1);
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#else
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uint32_t r = 0;
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uint32_t s;
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a -= 1;
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s = (a > 0xffff) << 4; a >>= s; r |= s;
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s = (a > 0xff ) << 3; a >>= s; r |= s;
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s = (a > 0xf ) << 2; a >>= s; r |= s;
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s = (a > 0x3 ) << 1; a >>= s; r |= s;
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return (r | (a >> 1)) + 1;
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#endif
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}
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// Count the number of trailing binary zeros in a
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// lfs_ctz(0) may be undefined
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static inline uint32_t lfs_ctz(uint32_t a) {
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#if !defined(LFS_NO_INTRINSICS) && defined(__GNUC__)
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return __builtin_ctz(a);
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#else
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return lfs_npw2((a & -a) + 1) - 1;
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#endif
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}
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// Count the number of binary ones in a
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static inline uint32_t lfs_popc(uint32_t a) {
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#if !defined(LFS_NO_INTRINSICS) && (defined(__GNUC__) || defined(__CC_ARM))
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return __builtin_popcount(a);
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#else
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a = a - ((a >> 1) & 0x55555555);
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a = (a & 0x33333333) + ((a >> 2) & 0x33333333);
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return (((a + (a >> 4)) & 0xf0f0f0f) * 0x1010101) >> 24;
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#endif
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}
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// Find the sequence comparison of a and b, this is the distance
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// between a and b ignoring overflow
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static inline int32_t lfs_scmp(uint32_t a, uint32_t b) {
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return (int32_t)(uint32_t)(a - b);
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}
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// Convert between 32-bit little-endian and native order
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static inline uint32_t lfs_fromle32(uint32_t a) {
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#if !defined(LFS_NO_INTRINSICS) && ( \
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(defined( BYTE_ORDER ) && defined( ORDER_LITTLE_ENDIAN ) && BYTE_ORDER == ORDER_LITTLE_ENDIAN ) || \
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(defined(__BYTE_ORDER ) && defined(__ORDER_LITTLE_ENDIAN ) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN ) || \
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(defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
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return a;
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#elif !defined(LFS_NO_INTRINSICS) && ( \
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(defined( BYTE_ORDER ) && defined( ORDER_BIG_ENDIAN ) && BYTE_ORDER == ORDER_BIG_ENDIAN ) || \
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(defined(__BYTE_ORDER ) && defined(__ORDER_BIG_ENDIAN ) && __BYTE_ORDER == __ORDER_BIG_ENDIAN ) || \
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(defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
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return __builtin_bswap32(a);
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#else
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return (((uint8_t*)&a)[0] << 0) |
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(((uint8_t*)&a)[1] << 8) |
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(((uint8_t*)&a)[2] << 16) |
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(((uint8_t*)&a)[3] << 24);
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#endif
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}
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static inline uint32_t lfs_tole32(uint32_t a) {
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return lfs_fromle32(a);
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}
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// Convert between 32-bit big-endian and native order
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static inline uint32_t lfs_frombe32(uint32_t a) {
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#if !defined(LFS_NO_INTRINSICS) && ( \
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(defined( BYTE_ORDER ) && defined( ORDER_LITTLE_ENDIAN ) && BYTE_ORDER == ORDER_LITTLE_ENDIAN ) || \
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(defined(__BYTE_ORDER ) && defined(__ORDER_LITTLE_ENDIAN ) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN ) || \
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(defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
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return __builtin_bswap32(a);
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#elif !defined(LFS_NO_INTRINSICS) && ( \
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(defined( BYTE_ORDER ) && defined( ORDER_BIG_ENDIAN ) && BYTE_ORDER == ORDER_BIG_ENDIAN ) || \
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(defined(__BYTE_ORDER ) && defined(__ORDER_BIG_ENDIAN ) && __BYTE_ORDER == __ORDER_BIG_ENDIAN ) || \
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(defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
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return a;
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#else
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return (((uint8_t*)&a)[0] << 24) |
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(((uint8_t*)&a)[1] << 16) |
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(((uint8_t*)&a)[2] << 8) |
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(((uint8_t*)&a)[3] << 0);
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#endif
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}
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static inline uint32_t lfs_tobe32(uint32_t a) {
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return lfs_frombe32(a);
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}
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// Calculate CRC-32 with polynomial = 0x04c11db7
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uint32_t lfs_crc(uint32_t crc, const void *buffer, size_t size);
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// Allocate memory, only used if buffers are not provided to littlefs
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// Note, memory must be 64-bit aligned
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static inline void *lfs_malloc(size_t size) {
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#ifndef LFS_NO_MALLOC
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return malloc(size);
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#else
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(void)size;
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return NULL;
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#endif
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}
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// Deallocate memory, only used if buffers are not provided to littlefs
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static inline void lfs_free(void *p) {
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#ifndef LFS_NO_MALLOC
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free(p);
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#else
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(void)p;
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#endif
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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#endif
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