littlefs_searching.c File Reference

#include <stdint.h>
#include <stdlib.h>
#include "littlefs/lfs.h"
#include "littlefs/littlefs_searching.h"
#include "littlefs/littlefs_helper.h"

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Functions
int32_t	LFS_search_count_occurrences (const char *filename, const uint8_t *needle, size_t needle_len)
	Count the number of occurrences of a string/byte pattern in an LFS file.
int32_t	LFS_search_find_nth_occurrence (const char *filename, const uint8_t *needle, size_t needle_len, uint16_t n, lfs_soff_t *out_offset)
	Find the byte offset of the nth occurrence of a string/byte pattern in an LFS file.

Function Documentation

LFS_search_count_occurrences()

int32_t LFS_search_count_occurrences	(	const char *	filename,
		const uint8_t *	needle,
		size_t	needle_len )

Count the number of occurrences of a string/byte pattern in an LFS file.

Parameters

filename	File name/path of the "haystack" file to open and search within.
needle	Pattern to search for.
needle_len	Length of pattern to search for.

Returns

The number of matches. 0 if no matches. Negative LFS error code on error.

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LFS_search_find_nth_occurrence()

int32_t LFS_search_find_nth_occurrence	(	const char *	filename,
		const uint8_t *	needle,
		size_t	needle_len,
		uint16_t	n,
		lfs_soff_t *	out_offset )

Find the byte offset of the nth occurrence of a string/byte pattern in an LFS file.

Parameters

lfs	Filesystem.
filename	File name/path of the "haystack" file to open and search within.
needle	Pattern to search for.
needle_len	Length of pattern to search for.
n	Nth occurrence to find.
out_offset	Pointer to store the byte offset of the found occurrence.

Returns

0 on success, or a negative LFS error code, or a positive error code indicating a problem in function. Returns 1 if invalid arguments. Returns 3 if needle not found.

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