int
main ()
{
/* Test case n = 0. */
u16_possible_linebreaks (NULL, 0, "GB18030", NULL);
{
static const uint16_t input[61] =
/* "Grüß Gott. Здравствуйте! x=(-b±sqrt(b²-4ac))/(2a) 日本語,中文,한글" */
{ 'G', 'r', 0x00FC, 0x00DF, ' ', 'G', 'o', 't', 't', '.', ' ',
0x0417, 0x0434, 0x0440, 0x0430, 0x0432, 0x0441, 0x0442, 0x0432, 0x0443,
0x0439, 0x0442, 0x0435, '!', ' ',
'x', '=', '(', '-', 'b', 0x00B1, 's', 'q', 'r', 't', '(', 'b', 0x00B2,
'-', '4', 'a', 'c', ')', ')', '/', '(', '2', 'a', ')', ' ', ' ',
0x65E5, 0x672C, 0x8A9E, ',', 0x4E2D, 0x6587, ',', 0xD55C, 0xAE00, '\n'
};
{
char *p = (char *) malloc (SIZEOF (input));
size_t i;
u16_possible_linebreaks (input, SIZEOF (input), "GB18030", p);
for (i = 0; i < 61; i++)
{
ASSERT (p[i] == (i == 60 ? UC_BREAK_MANDATORY :
i == 5
|| i == 11 || i == 25
|| i == 27 || i == 29 || i == 30 || i == 35
|| i == 45 || i == 51
|| i == 52 || i == 53 || i == 55 || i == 56
|| i == 58 || i == 59 ? UC_BREAK_POSSIBLE :
UC_BREAK_PROHIBITED));
}
free (p);
}
{
char *p = (char *) malloc (SIZEOF (input));
size_t i;
u16_possible_linebreaks (input, SIZEOF (input), "GB2312", p);
for (i = 0; i < 61; i++)
{
ASSERT (p[i] == (i == 60 ? UC_BREAK_MANDATORY :
i == 5
|| i == 11 || i == 25
|| i == 27 || i == 29 || i == 30 || i == 35
|| i == 37 || i == 45 || i == 51
|| i == 52 || i == 53 || i == 55 || i == 56
|| i == 58 || i == 59 ? UC_BREAK_POSSIBLE :
UC_BREAK_PROHIBITED));
}
free (p);
}
}
return 0;
}
int
u16_width_linebreaks (const uint16_t *s, size_t n,
int width, int start_column, int at_end_columns,
const char *o, const char *encoding,
char *p)
{
const uint16_t *s_end;
char *last_p;
int last_column;
int piece_width;
u16_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 = u16_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;
}