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Added LFS_CONFIG for user provided configuration of the utils

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Suggested by sn00pster, LFS_CONFIG is an opt-in user provided
configuration file that will override the util implementation in
lfs_util.h. This is useful for allowing system-specific overrides
without needing to rely on git merges or other forms of patching
for updates.
This commit is contained in:
Christopher Haster 2018-02-22 13:34:10 -06:00
parent b2124a5ae5
commit 1476181bd1
2 changed files with 20 additions and 0 deletions
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6
lfs_util.c
View File

@ -17,7 +17,11 @@
*/
#include "lfs_util.h"
// Only compile if user does not provide custom config
#ifndef LFS_CONFIG
// Software CRC implementation with small lookup table
void lfs_crc(uint32_t *restrict crc, const void *buffer, size_t size) {
static const uint32_t rtable[16] = {
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
@ -34,3 +38,5 @@ void lfs_crc(uint32_t *restrict crc, const void *buffer, size_t size) {
}
}
#endif

14
lfs_util.h
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@ -18,6 +18,19 @@
#ifndef LFS_UTIL_H
#define LFS_UTIL_H
// Users can override lfs_util.h with their own configuration by defining
// LFS_CONFIG as a header file to include (-DLFS_CONFIG=lfs_config.h).
//
// If LFS_CONFIG is used, none of the default utils will be emitted and must be
// provided by the config file. To start I would suggest copying lfs_util.h and
// modifying as needed.
#ifdef LFS_CONFIG
#define LFS_STRINGIZE(x) LFS_STRINGIZE2(x)
#define LFS_STRINGIZE2(x) #x
#include LFS_STRINGIZE(LFS_CONFIG)
#else
// System includes
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
@ -169,3 +182,4 @@ static inline void lfs_free(void *p) {
#endif
#endif