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/*
* kmscon - Unicode Handling
*
* Copyright (c) 2011 David Herrmann <dh.herrmann@googlemail.com>
* Copyright (c) 2011 University of Tuebingen
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Unicode Handling
* The main goal of the symbol(_table) functions is to provide a datatype which
* can contain the representation of any printable character. This includes all
* basic Unicode characters but also combined characters.
* To avoid all the memory management we still represent a character as a single
* integer value (kmscon_symbol_t) but internally we allocate a string which is
* represented by this value.
*
* A kmscon_symbol_t is an integer which represents a single character point.
* For most Unicode characters this is simply the UCS4 representation. In fact,
* every UCS4 characters is a valid kmscon_symbol_t object.
* However, Unicode standard allows combining marks. Therefore, some characters
* consists of more than one Unicode character.
* A kmscon_symbol_table object provides all those combined characters as single
* integers. You simply create a valid base character and append your combining
* marks and the table will return a new valid kmscon_symbol_t. It is no longer
* a valid UCS4 value, though. But no memory management is needed as all
* kmscon_symbol_t objects are simple integers.
*/
#ifndef KMSCON_UNICODE_H
#define KMSCON_UNICODE_H
#include <inttypes.h>
#include <stdlib.h>
/* symbols and symbol table */
struct kmscon_symbol_table;
typedef uint32_t kmscon_symbol_t;
extern const kmscon_symbol_t kmscon_symbol_default;
int kmscon_symbol_table_new(struct kmscon_symbol_table **out);
void kmscon_symbol_table_ref(struct kmscon_symbol_table *st);
void kmscon_symbol_table_unref(struct kmscon_symbol_table *st);
kmscon_symbol_t kmscon_symbol_make(uint32_t ucs4);
kmscon_symbol_t kmscon_symbol_append(struct kmscon_symbol_table *st,
kmscon_symbol_t sym, uint32_t ucs4);
const uint32_t *kmscon_symbol_get(const struct kmscon_symbol_table *st,
kmscon_symbol_t *sym, size_t *size);
const char *kmscon_symbol_get_u8(const struct kmscon_symbol_table *st,
kmscon_symbol_t sym, size_t *size);
void kmscon_symbol_free_u8(const char *s);
/* utf8 state machine */
struct kmscon_utf8_mach;
enum kmscon_utf8_mach_state {
KMSCON_UTF8_START,
KMSCON_UTF8_ACCEPT,
KMSCON_UTF8_REJECT,
KMSCON_UTF8_EXPECT1,
KMSCON_UTF8_EXPECT2,
KMSCON_UTF8_EXPECT3,
};
int kmscon_utf8_mach_new(struct kmscon_utf8_mach **out);
void kmscon_utf8_mach_free(struct kmscon_utf8_mach *mach);
int kmscon_utf8_mach_feed(struct kmscon_utf8_mach *mach, char c);
uint32_t kmscon_utf8_mach_get(struct kmscon_utf8_mach *mach);
#endif /* KMSCON_UNICODE_H */
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