libsession-util/include/session/util.h

#pragma once

#include <stddef.h>
#include <stdint.h>

#include "export.h"

#ifdef __cplusplus
extern "C" {
#endif

/// Truncates an utf-16 encoded string to at most `codepoint_len` codepoints long, taking care to
/// not truncate in the middle of a surrogate pair. Notes that if the input string contains invalid
/// UTF-16 sequences (e.g. unpaired surrogates) the behavior here is undefined.
LIBSESSION_EXPORT size_t utf16_count_truncated_to_codepoints(
        const uint16_t* utf16_string, size_t utf16_string_len, size_t codepoint_len);

/// Returns the number of unicode codepoints in a utf-16 encoded string.
LIBSESSION_EXPORT size_t utf16_count(const uint16_t* utf16_string, size_t utf16_string_len);

#ifdef __cplusplus
}
#endif