ESPTerm - ESP8266 terminal emulator. Branches: [master] patches, [work] next release
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espterm-firmware/user/utf8.h

72 lines
1.8 KiB

//
// Created by MightyPork on 2017/09/10.
//
#ifndef ESPTERM_UTF8_H
#define ESPTERM_UTF8_H
#include <c_types.h>
// 160 is maximum possible
#define UNICODE_CACHE_SIZE 160
typedef u8 UnicodeCacheRef;
#define IS_UNICODE_CACHE_REF(c) ((c) < 32 || (c) >= 127)
/**
* Clear the entire cache
* @return
*/
void unicode_cache_clear(void);
/**
* Add a code point to the cache. ASCII is passed through.
* If the code point is already stored, its use counter is incremented.
*
* @param bytes - utf8 bytes
* @return the obtained look-up reference
*/
UnicodeCacheRef unicode_cache_add(const u8 *bytes);
/**
* Look up a code point in the cache by reference. Do not change the use counter.
*
* @param ref - reference obtained earlier using unicode_cache_add()
* @param target - buffer of size 4 to hold the result.
* @return true if the look-up succeeded
*/
bool unicode_cache_retrieve(UnicodeCacheRef ref, u8 *target);
/**
* Remove an occurence of a code point from the cache.
* If the code point is used more than once, the use counter is decremented.
*
* @param ref - reference to remove or reduce
* @return true if the code point was found in the cache
*/
bool unicode_cache_remove(UnicodeCacheRef ref);
/**
* Encode a code point using UTF-8
*
* @author Ondřej Hruška <ondra@ondrovo.com>
* @license MIT
*
* @param out - output buffer (min 4 characters), will be 0-terminated if shorten than 4
* @param utf - code point 0-0x10FFFF
* @return number of bytes on success, 0 on failure (also produces U+FFFD, which uses 3 bytes)
*/
int utf8_encode(char *out, uint32_t utf);
#if DEBUG_UTFCACHE
#define utfc_warn warn
#define utfc_dbg dbg
#define utfc_info info
#else
#define utfc_warn(fmt, ...)
#define utfc_dbg(fmt, ...)
#define utfc_info(fmt, ...)
#endif
#endif //ESPTERM_UTF8_H