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/* linebreak.h - line breaking of Unicode strings
Copyright (C) 2001-2003 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifndef _LINEBREAK_H
#define _LINEBREAK_H
/* Get size_t. */
#include <stddef.h>
/* Display width. */
/* These functions are locale dependent. The encoding argument identifies
the encoding (e.g. "ISO-8859-2" for Polish). */
/* Return the encoding of the current locale. */
extern const char * locale_charset (void);
/* Determine number of column positions required for UC. */
extern int uc_width (unsigned int uc, const char *encoding);
/* Determine number of column positions required for first N units
(or fewer if S ends before this) in S. */
extern int u8_width (const unsigned char *s, size_t n, const char *encoding);
extern int u16_width (const unsigned short *s, size_t n, const char *encoding);
extern int u32_width (const unsigned int *s, size_t n, const char *encoding);
/* Line breaking. */
enum {
UC_BREAK_UNDEFINED,
UC_BREAK_PROHIBITED,
UC_BREAK_POSSIBLE,
UC_BREAK_MANDATORY,
UC_BREAK_HYPHENATION
};
/* Determine the line break points in S, and store the result at p[0..n-1].
p[i] = UC_BREAK_MANDATORY means that s[i] is a line break character.
p[i] = UC_BREAK_POSSIBLE means that a line break may be inserted between
s[i-1] and s[i].
p[i] = UC_BREAK_HYPHENATION means that a hyphen and a line break may be
inserted between s[i-1] and s[i]. But beware of language dependent
hyphenation rules.
p[i] = UC_BREAK_PROHIBITED means that s[i-1] and s[i] must not be separated.
*/
extern void u8_possible_linebreaks (const unsigned char *s, size_t n,
const char *encoding,
char *p);
extern void u16_possible_linebreaks (const unsigned short *s, size_t n,
const char *encoding,
char *p);
extern void u32_possible_linebreaks (const unsigned int *s, size_t n,
const char *encoding,
char *p);
extern void mbs_possible_linebreaks (const char *s, size_t n,
const char *encoding,
char *p);
/* Choose the best line breaks, assuming the uc_width function.
Return the column after the end of the string.
o is an optional override; if o[i] != UC_BREAK_UNDEFINED, o[i] takes
precedence over p[i] as returned by the *_possible_linebreaks function.
*/
extern int
u8_width_linebreaks (const unsigned char *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding,
char *p);
extern int
u16_width_linebreaks (const unsigned short *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding,
char *p);
extern int
u32_width_linebreaks (const unsigned int *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding,
char *p);
extern int
mbs_width_linebreaks (const char *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding,
char *p);
#endif /* _LINEBREAK_H */
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