littlefs/lfs_config.h

/*
 * Configuration and type definitions
 *
 * Copyright (c) 2017 Christopher Haster
 * Distributed under the MIT license
 */
#ifndef LFS_CONFIG_H
#define LFS_CONFIG_H

#include <stdint.h>

// Type definitions
typedef uint64_t lfs_lword_t;
typedef uint32_t lfs_word_t;
typedef uint16_t lfs_hword_t;

typedef lfs_word_t lfs_size_t;
typedef int32_t lfs_ssize_t;
typedef lfs_word_t lfs_off_t;
typedef int lfs_error_t;

typedef lfs_lword_t lfs_lsize_t;
typedef lfs_word_t  lfs_ino_t;
typedef lfs_hword_t lfs_ioff_t;

// Maximum length of file name
#define LFS_NAME_MAX 255

// Builtin functions
static inline lfs_word_t lfs_max(lfs_word_t a, lfs_word_t b) {
    return (a > b) ? a : b;
}

static inline lfs_word_t lfs_min(lfs_word_t a, lfs_word_t b) {
    return (a < b) ? a : b;
}

static inline lfs_word_t lfs_ctz(lfs_word_t a) {
    return __builtin_ctz(a);
}

static inline lfs_word_t lfs_npw2(lfs_word_t a) {
    return 32 - __builtin_clz(a-1);
}

static inline void lfs_swap(lfs_word_t *a, lfs_word_t *b) {
    lfs_word_t temp = *a;
    *a = *b;
    *b = temp;
}

// Attributes
#define lfs_disk_struct struct __attribute__((packed))

// Logging operations
#include <stdio.h>
#define LFS_ERROR(fmt, ...) printf("Error: " fmt "\n", __VA_ARGS__)
#define LFS_WARN(fmt, ...)  printf("Warn: "  fmt "\n", __VA_ARGS__)
#define LFS_INFO(fmt, ...)  printf("Info: "  fmt "\n", __VA_ARGS__)


#endif