1 /* Line breaking of UTF-32 strings.
2 Copyright (C) 2001-2003, 2006-2010 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 <http://www.gnu.org/licenses/>. */
26 u32_width_linebreaks (const uint32_t *s, size_t n,
27 int width, int start_column, int at_end_columns,
28 const char *o, const char *encoding,
31 const uint32_t *s_end;
36 u32_possible_linebreaks (s, n, encoding, p);
40 last_column = start_column;
46 /* Respect the override. */
47 if (o != NULL && *o != UC_BREAK_UNDEFINED)
50 if (*p == UC_BREAK_POSSIBLE || *p == UC_BREAK_MANDATORY)
52 /* An atomic piece of text ends here. */
53 if (last_p != NULL && last_column + piece_width > width)
55 /* Insert a line break. */
56 *last_p = UC_BREAK_POSSIBLE;
61 if (*p == UC_BREAK_MANDATORY)
63 /* uc is a line break character. */
64 /* Start a new piece at column 0. */
71 /* uc is not a line break character. */
74 if (*p == UC_BREAK_POSSIBLE)
76 /* Start a new piece. */
78 last_column += piece_width;
80 /* No line break for the moment, may be turned into
81 UC_BREAK_POSSIBLE later, via last_p. */
84 *p = UC_BREAK_PROHIBITED;
86 w = uc_width (uc, encoding);
87 if (w >= 0) /* ignore control characters in the string */
97 /* The last atomic piece of text ends here. */
98 if (last_p != NULL && last_column + piece_width + at_end_columns > width)
100 /* Insert a line break. */
101 *last_p = UC_BREAK_POSSIBLE;
105 return last_column + piece_width;