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104 lines
4.2 KiB
C
104 lines
4.2 KiB
C
/* linebreak.h - line breaking of Unicode strings
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Copyright (C) 2001-2003 Free Software Foundation, Inc.
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Written by Bruno Haible <haible@clisp.cons.org>, 2001.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef _LINEBREAK_H
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#define _LINEBREAK_H
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/* Get size_t. */
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#include <stddef.h>
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/* Display width. */
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/* These functions are locale dependent. The encoding argument identifies
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the encoding (e.g. "ISO-8859-2" for Polish). */
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/* Return the encoding of the current locale. */
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extern const char * locale_charset (void);
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/* Determine number of column positions required for UC. */
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extern int uc_width (unsigned int uc, const char *encoding);
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/* Determine number of column positions required for first N units
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(or fewer if S ends before this) in S. */
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extern int u8_width (const unsigned char *s, size_t n, const char *encoding);
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extern int u16_width (const unsigned short *s, size_t n, const char *encoding);
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extern int u32_width (const unsigned int *s, size_t n, const char *encoding);
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/* Line breaking. */
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enum {
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UC_BREAK_UNDEFINED,
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UC_BREAK_PROHIBITED,
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UC_BREAK_POSSIBLE,
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UC_BREAK_MANDATORY,
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UC_BREAK_HYPHENATION
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};
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/* Determine the line break points in S, and store the result at p[0..n-1].
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p[i] = UC_BREAK_MANDATORY means that s[i] is a line break character.
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p[i] = UC_BREAK_POSSIBLE means that a line break may be inserted between
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s[i-1] and s[i].
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p[i] = UC_BREAK_HYPHENATION means that a hyphen and a line break may be
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inserted between s[i-1] and s[i]. But beware of language dependent
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hyphenation rules.
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p[i] = UC_BREAK_PROHIBITED means that s[i-1] and s[i] must not be separated.
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*/
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extern void u8_possible_linebreaks (const unsigned char *s, size_t n,
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const char *encoding,
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char *p);
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extern void u16_possible_linebreaks (const unsigned short *s, size_t n,
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const char *encoding,
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char *p);
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extern void u32_possible_linebreaks (const unsigned int *s, size_t n,
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const char *encoding,
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char *p);
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extern void mbs_possible_linebreaks (const char *s, size_t n,
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const char *encoding,
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char *p);
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/* Choose the best line breaks, assuming the uc_width function.
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Return the column after the end of the string.
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o is an optional override; if o[i] != UC_BREAK_UNDEFINED, o[i] takes
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precedence over p[i] as returned by the *_possible_linebreaks function.
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*/
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extern int
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u8_width_linebreaks (const unsigned char *s, size_t n,
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int width, int start_column, int at_end_columns,
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const char *o, const char *encoding,
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char *p);
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extern int
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u16_width_linebreaks (const unsigned short *s, size_t n,
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int width, int start_column, int at_end_columns,
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const char *o, const char *encoding,
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char *p);
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extern int
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u32_width_linebreaks (const unsigned int *s, size_t n,
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int width, int start_column, int at_end_columns,
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const char *o, const char *encoding,
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char *p);
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extern int
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mbs_width_linebreaks (const char *s, size_t n,
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int width, int start_column, int at_end_columns,
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const char *o, const char *encoding,
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char *p);
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#endif /* _LINEBREAK_H */
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