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/* Line breaking of UTF-8 strings.
Copyright (C) 2001-2003, 2006-2015 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 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 <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unilbrk.h"
#include "unistr.h"
#include "uniwidth.h"
int
u8_width_linebreaks (const uint8_t *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding,
char *p)
{
const uint8_t *s_end;
char *last_p;
int last_column;
int piece_width;
u8_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;
int count = u8_mbtouc_unsafe (&uc, s, s_end - 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 += count;
p += count;
if (o != NULL)
o += count;
}
/* 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;
}
#ifdef TEST
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Read the contents of an input stream, and return it, terminated with a NUL
byte. */
char *
read_file (FILE *stream)
{
#define BUFSIZE 4096
char *buf = NULL;
int alloc = 0;
int size = 0;
int count;
while (! feof (stream))
{
if (size + BUFSIZE > alloc)
{
alloc = alloc + alloc / 2;
if (alloc < size + BUFSIZE)
alloc = size + BUFSIZE;
buf = realloc (buf, alloc);
if (buf == NULL)
{
fprintf (stderr, "out of memory\n");
exit (1);
}
}
count = fread (buf + size, 1, BUFSIZE, stream);
if (count == 0)
{
if (ferror (stream))
{
perror ("fread");
exit (1);
}
}
else
size += count;
}
buf = realloc (buf, size + 1);
if (buf == NULL)
{
fprintf (stderr, "out of memory\n");
exit (1);
}
buf[size] = '\0';
return buf;
#undef BUFSIZE
}
int
main (int argc, char * argv[])
{
if (argc == 2)
{
/* Insert line breaks for a given width. */
int width = atoi (argv[1]);
char *input = read_file (stdin);
int length = strlen (input);
char *breaks = malloc (length);
int i;
u8_width_linebreaks ((uint8_t *) input, length, width, 0, 0, NULL, "UTF-8", breaks);
for (i = 0; i < length; i++)
{
switch (breaks[i])
{
case UC_BREAK_POSSIBLE:
putc ('\n', stdout);
break;
case UC_BREAK_MANDATORY:
break;
case UC_BREAK_PROHIBITED:
break;
default:
abort ();
}
putc (input[i], stdout);
}
free (breaks);
return 0;
}
else
return 1;
}
#endif /* TEST */
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