summaryrefslogtreecommitdiff
path: root/prism/util/pm_memchr.h
blob: 1eae6ab1badf1cc4d84c29fcc599f9f6ddaed792 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
/**
 * @file pm_memchr.h
 *
 * A custom memchr implementation.
 */
#ifndef PRISM_MEMCHR_H
#define PRISM_MEMCHR_H

#include "prism/defines.h"
#include "prism/enc/pm_encoding.h"

#include <stddef.h>

/**
 * We need to roll our own memchr to handle cases where the encoding changes and
 * we need to search for a character in a buffer that could be the trailing byte
 * of a multibyte character.
 *
 * @param source The source string.
 * @param character The character to search for.
 * @param number The maximum number of bytes to search.
 * @param encoding_changed Whether the encoding changed.
 * @param encoding A pointer to the encoding.
 * @return A pointer to the first occurrence of the character in the source
 *     string, or NULL if no such character exists.
 */
void * pm_memchr(const void *source, int character, size_t number, bool encoding_changed, pm_encoding_t *encoding);

#endif