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yaml
---
r: 54701
b: refs/heads/master
c: 2f1a2cc
h: refs/heads/master
i:
  54699: 9ca6d4f
v: v3
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Egmont Koblinger authored and Linus Torvalds committed May 8, 2007
1 parent 7e43e7d commit 33c63cb
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Showing 3 changed files with 183 additions and 82 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: e659ba4a0d2d471c0d73590f78e1a1b5a1eede48
refs/heads/master: 2f1a2ccb9c0de632ab07193becf5f7121794f6ae
6 changes: 3 additions & 3 deletions trunk/drivers/char/consolemap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -626,10 +626,10 @@ conv_uni_to_pc(struct vc_data *conp, long ucs)

/* Only 16-bit codes supported at this time */
if (ucs > 0xffff)
ucs = 0xfffd; /* U+FFFD: REPLACEMENT CHARACTER */
else if (ucs < 0x20 || ucs >= 0xfffe)
return -4; /* Not found */
else if (ucs < 0x20)
return -1; /* Not a printable character */
else if (ucs == 0xfeff || (ucs >= 0x200a && ucs <= 0x200f))
else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f))
return -2; /* Zero-width space */
/*
* UNI_DIRECT_BASE indicates the start of the region in the User Zone
Expand Down
257 changes: 179 additions & 78 deletions trunk/drivers/char/vt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1932,6 +1932,46 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
char con_buf[CON_BUF_SIZE];
DECLARE_MUTEX(con_buf_sem);

/* is_double_width() is based on the wcwidth() implementation by
* Markus Kuhn -- 2003-05-20 (Unicode 4.0)
* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
*/
struct interval {
uint32_t first;
uint32_t last;
};

static int bisearch(uint32_t ucs, const struct interval *table, int max)
{
int min = 0;
int mid;

if (ucs < table[0].first || ucs > table[max].last)
return 0;
while (max >= min) {
mid = (min + max) / 2;
if (ucs > table[mid].last)
min = mid + 1;
else if (ucs < table[mid].first)
max = mid - 1;
else
return 1;
}
return 0;
}

static int is_double_width(uint32_t ucs)
{
static const struct interval double_width[] = {
{ 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
{ 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
{ 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, { 0xFFE0, 0xFFE6 },
{ 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
};
return bisearch(ucs, double_width,
sizeof(double_width) / sizeof(*double_width) - 1);
}

/* acquires console_sem */
static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
Expand All @@ -1948,6 +1988,10 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
unsigned int currcons;
unsigned long draw_from = 0, draw_to = 0;
struct vc_data *vc;
unsigned char vc_attr;
uint8_t rescan;
uint8_t inverse;
uint8_t width;
u16 himask, charmask;
const unsigned char *orig_buf = NULL;
int orig_count;
Expand Down Expand Up @@ -2010,53 +2054,86 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
buf++;
n++;
count--;
rescan = 0;
inverse = 0;
width = 1;

/* Do no translation at all in control states */
if (vc->vc_state != ESnormal) {
tc = c;
} else if (vc->vc_utf && !vc->vc_disp_ctrl) {
/* Combine UTF-8 into Unicode */
/* Malformed sequences as sequences of replacement glyphs */
/* Combine UTF-8 into Unicode in vc_utf_char.
* vc_utf_count is the number of continuation bytes still
* expected to arrive.
* vc_npar is the number of continuation bytes arrived so
* far
*/
rescan_last_byte:
if(c > 0x7f) {
if ((c & 0xc0) == 0x80) {
/* Continuation byte received */
static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
if (vc->vc_utf_count) {
if ((c & 0xc0) == 0x80) {
vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
if (--vc->vc_utf_count) {
vc->vc_npar++;
continue;
}
tc = c = vc->vc_utf_char;
} else
goto replacement_glyph;
} else {
vc->vc_npar = 0;
if ((c & 0xe0) == 0xc0) {
vc->vc_utf_count = 1;
vc->vc_utf_char = (c & 0x1f);
} else if ((c & 0xf0) == 0xe0) {
vc->vc_utf_count = 2;
vc->vc_utf_char = (c & 0x0f);
} else if ((c & 0xf8) == 0xf0) {
vc->vc_utf_count = 3;
vc->vc_utf_char = (c & 0x07);
} else if ((c & 0xfc) == 0xf8) {
vc->vc_utf_count = 4;
vc->vc_utf_char = (c & 0x03);
} else if ((c & 0xfe) == 0xfc) {
vc->vc_utf_count = 5;
vc->vc_utf_char = (c & 0x01);
} else
goto replacement_glyph;
vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
vc->vc_npar++;
if (--vc->vc_utf_count) {
/* Still need some bytes */
continue;
}
}
/* Got a whole character */
c = vc->vc_utf_char;
/* Reject overlong sequences */
if (c <= utf8_length_changes[vc->vc_npar - 1] ||
c > utf8_length_changes[vc->vc_npar])
c = 0xfffd;
} else {
/* Unexpected continuation byte */
vc->vc_utf_count = 0;
c = 0xfffd;
}
} else {
if (vc->vc_utf_count)
goto replacement_glyph;
tc = c;
/* Single ASCII byte or first byte of a sequence received */
if (vc->vc_utf_count) {
/* Continuation byte expected */
rescan = 1;
vc->vc_utf_count = 0;
c = 0xfffd;
} else if (c > 0x7f) {
/* First byte of a multibyte sequence received */
vc->vc_npar = 0;
if ((c & 0xe0) == 0xc0) {
vc->vc_utf_count = 1;
vc->vc_utf_char = (c & 0x1f);
} else if ((c & 0xf0) == 0xe0) {
vc->vc_utf_count = 2;
vc->vc_utf_char = (c & 0x0f);
} else if ((c & 0xf8) == 0xf0) {
vc->vc_utf_count = 3;
vc->vc_utf_char = (c & 0x07);
} else if ((c & 0xfc) == 0xf8) {
vc->vc_utf_count = 4;
vc->vc_utf_char = (c & 0x03);
} else if ((c & 0xfe) == 0xfc) {
vc->vc_utf_count = 5;
vc->vc_utf_char = (c & 0x01);
} else {
/* 254 and 255 are invalid */
c = 0xfffd;
}
if (vc->vc_utf_count) {
/* Still need some bytes */
continue;
}
}
/* Nothing to do if an ASCII byte was received */
}
/* End of UTF-8 decoding. */
/* c is the received character, or U+FFFD for invalid sequences. */
/* Replace invalid Unicode code points with U+FFFD too */
if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
c = 0xfffd;
tc = c;
} else { /* no utf or alternate charset mode */
tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
}

/* If the original code was a control character we
Expand All @@ -2076,56 +2153,80 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
&& (c != 128+27);

if (vc->vc_state == ESnormal && ok) {
if (vc->vc_utf && !vc->vc_disp_ctrl) {
if (is_double_width(c))
width = 2;
}
/* Now try to find out how to display it */
tc = conv_uni_to_pc(vc, tc);
if (tc & ~charmask) {
if ( tc == -4 ) {
/* If we got -4 (not found) then see if we have
defined a replacement character (U+FFFD) */
replacement_glyph:
tc = conv_uni_to_pc(vc, 0xfffd);
if (!(tc & ~charmask))
goto display_glyph;
} else if ( tc != -3 )
continue; /* nothing to display */
/* no hash table or no replacement --
* hope for the best */
if ( c & ~charmask )
tc = '?';
else
tc = c;
if (tc == -1 || tc == -2) {
continue; /* nothing to display */
}
/* Glyph not found */
if (!(vc->vc_utf && !vc->vc_disp_ctrl) && !(c & ~charmask)) {
/* In legacy mode use the glyph we get by a 1:1 mapping.
This would make absolutely no sense with Unicode in mind. */
tc = c;
} else {
/* Display U+FFFD. If it's not found, display an inverse question mark. */
tc = conv_uni_to_pc(vc, 0xfffd);
if (tc < 0) {
inverse = 1;
tc = conv_uni_to_pc(vc, '?');
if (tc < 0) tc = '?';
}
}
}

display_glyph:
if (vc->vc_need_wrap || vc->vc_decim)
FLUSH
if (vc->vc_need_wrap) {
cr(vc);
lf(vc);
}
if (vc->vc_decim)
insert_char(vc, 1);
scr_writew(himask ?
((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
(vc->vc_attr << 8) + tc,
(u16 *) vc->vc_pos);
if (DO_UPDATE(vc) && draw_x < 0) {
draw_x = vc->vc_x;
draw_from = vc->vc_pos;
}
if (vc->vc_x == vc->vc_cols - 1) {
vc->vc_need_wrap = vc->vc_decawm;
draw_to = vc->vc_pos + 2;
if (!inverse) {
vc_attr = vc->vc_attr;
} else {
vc->vc_x++;
draw_to = (vc->vc_pos += 2);
/* invert vc_attr */
if (!vc->vc_can_do_color) {
vc_attr = (vc->vc_attr) ^ 0x08;
} else if (vc->vc_hi_font_mask == 0x100) {
vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
} else {
vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
}
}
if (vc->vc_utf_count) {
if (vc->vc_npar) {
vc->vc_npar--;
goto display_glyph;

while (1) {
if (vc->vc_need_wrap || vc->vc_decim)
FLUSH
if (vc->vc_need_wrap) {
cr(vc);
lf(vc);
}
if (vc->vc_decim)
insert_char(vc, 1);
scr_writew(himask ?
((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
(vc_attr << 8) + tc,
(u16 *) vc->vc_pos);
if (DO_UPDATE(vc) && draw_x < 0) {
draw_x = vc->vc_x;
draw_from = vc->vc_pos;
}
if (vc->vc_x == vc->vc_cols - 1) {
vc->vc_need_wrap = vc->vc_decawm;
draw_to = vc->vc_pos + 2;
} else {
vc->vc_x++;
draw_to = (vc->vc_pos += 2);
}
vc->vc_utf_count = 0;

if (!--width) break;

tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
if (tc < 0) tc = ' ';
}

if (rescan) {
rescan = 0;
inverse = 0;
width = 1;
c = orig;
goto rescan_last_byte;
}
Expand Down

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