From fa095a4504cbe668e4244547e2c141597bea4ecf Mon Sep 17 00:00:00 2001 From: Andreas Rottmann Date: Mon, 14 Sep 2009 12:32:44 +0200 Subject: Imported Upstream version 0.9.1 --- lib/unilbrk/u32-width-linebreaks.c | 106 +++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 lib/unilbrk/u32-width-linebreaks.c (limited to 'lib/unilbrk/u32-width-linebreaks.c') diff --git a/lib/unilbrk/u32-width-linebreaks.c b/lib/unilbrk/u32-width-linebreaks.c new file mode 100644 index 0000000..2d36256 --- /dev/null +++ b/lib/unilbrk/u32-width-linebreaks.c @@ -0,0 +1,106 @@ +/* Line breaking of UTF-32 strings. + Copyright (C) 2001-2003, 2006-2008 Free Software Foundation, Inc. + Written by Bruno Haible , 2001. + + This program is free software: you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 3 of the License, 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see . */ + +#include + +/* Specification. */ +#include "unilbrk.h" + +#include "uniwidth.h" + +int +u32_width_linebreaks (const uint32_t *s, size_t n, + int width, int start_column, int at_end_columns, + const char *o, const char *encoding, + char *p) +{ + const uint32_t *s_end; + char *last_p; + int last_column; + int piece_width; + + u32_possible_linebreaks (s, n, encoding, p); + + s_end = s + n; + last_p = NULL; + last_column = start_column; + piece_width = 0; + while (s < s_end) + { + ucs4_t uc = *s; + + /* Respect the override. */ + if (o != NULL && *o != UC_BREAK_UNDEFINED) + *p = *o; + + if (*p == UC_BREAK_POSSIBLE || *p == UC_BREAK_MANDATORY) + { + /* An atomic piece of text ends here. */ + if (last_p != NULL && last_column + piece_width > width) + { + /* Insert a line break. */ + *last_p = UC_BREAK_POSSIBLE; + last_column = 0; + } + } + + if (*p == UC_BREAK_MANDATORY) + { + /* uc is a line break character. */ + /* Start a new piece at column 0. */ + last_p = NULL; + last_column = 0; + piece_width = 0; + } + else + { + /* uc is not a line break character. */ + int w; + + if (*p == UC_BREAK_POSSIBLE) + { + /* Start a new piece. */ + last_p = p; + last_column += piece_width; + piece_width = 0; + /* No line break for the moment, may be turned into + UC_BREAK_POSSIBLE later, via last_p. */ + } + + *p = UC_BREAK_PROHIBITED; + + w = uc_width (uc, encoding); + if (w >= 0) /* ignore control characters in the string */ + piece_width += w; + } + + s++; + p++; + if (o != NULL) + o++; + } + + /* The last atomic piece of text ends here. */ + if (last_p != NULL && last_column + piece_width + at_end_columns > width) + { + /* Insert a line break. */ + *last_p = UC_BREAK_POSSIBLE; + last_column = 0; + } + + return last_column + piece_width; +} -- cgit v1.2.3