1 /* Line breaking of UTF-16 strings.
2 Copyright (C) 2001-2003, 2006-2020 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2001.
5 This program is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Lesser General Public License as published
7 by the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
27 u16_width_linebreaks (const uint16_t *s
, size_t n
,
28 int width
, int start_column
, int at_end_columns
,
29 const char *o
, const char *encoding
,
32 const uint16_t *s_end
;
37 u16_possible_linebreaks (s
, n
, encoding
, p
);
41 last_column
= start_column
;
46 int count
= u16_mbtouc_unsafe (&uc
, s
, s_end
- s
);
48 /* Respect the override. */
49 if (o
!= NULL
&& *o
!= UC_BREAK_UNDEFINED
)
52 if (*p
== UC_BREAK_POSSIBLE
|| *p
== UC_BREAK_MANDATORY
)
54 /* An atomic piece of text ends here. */
55 if (last_p
!= NULL
&& last_column
+ piece_width
> width
)
57 /* Insert a line break. */
58 *last_p
= UC_BREAK_POSSIBLE
;
63 if (*p
== UC_BREAK_MANDATORY
)
65 /* uc is a line break character. */
66 /* Start a new piece at column 0. */
73 /* uc is not a line break character. */
76 if (*p
== UC_BREAK_POSSIBLE
)
78 /* Start a new piece. */
80 last_column
+= piece_width
;
82 /* No line break for the moment, may be turned into
83 UC_BREAK_POSSIBLE later, via last_p. */
86 *p
= UC_BREAK_PROHIBITED
;
88 w
= uc_width (uc
, encoding
);
89 if (w
>= 0) /* ignore control characters in the string */
99 /* The last atomic piece of text ends here. */
100 if (last_p
!= NULL
&& last_column
+ piece_width
+ at_end_columns
> width
)
102 /* Insert a line break. */
103 *last_p
= UC_BREAK_POSSIBLE
;
107 return last_column
+ piece_width
;