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path: root/drivers/char/vt.c
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Diffstat (limited to 'drivers/char/vt.c')
-rw-r--r--drivers/char/vt.c304
1 files changed, 217 insertions, 87 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 1bbb45b937f..bbd9fc41287 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -86,6 +86,7 @@
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/init.h>
+#include <linux/mutex.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/tiocl.h>
@@ -157,6 +158,8 @@ static void blank_screen_t(unsigned long dummy);
static void set_palette(struct vc_data *vc);
static int printable; /* Is console ready for printing? */
+static int default_utf8;
+module_param(default_utf8, int, S_IRUGO | S_IWUSR);
/*
* ignore_poke: don't unblank the screen when things are typed. This is
@@ -348,10 +351,12 @@ void update_region(struct vc_data *vc, unsigned long start, int count)
/* Structure of attributes is hardware-dependent */
-static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
+static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
+ u8 _underline, u8 _reverse, u8 _italic)
{
if (vc->vc_sw->con_build_attr)
- return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
+ return vc->vc_sw->con_build_attr(vc, _color, _intensity,
+ _blink, _underline, _reverse, _italic);
#ifndef VT_BUF_VRAM_ONLY
/*
@@ -368,10 +373,13 @@ static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8
u8 a = vc->vc_color;
if (!vc->vc_can_do_color)
return _intensity |
+ (_italic ? 2 : 0) |
(_underline ? 4 : 0) |
(_reverse ? 8 : 0) |
(_blink ? 0x80 : 0);
- if (_underline)
+ if (_italic)
+ a = (a & 0xF0) | vc->vc_itcolor;
+ else if (_underline)
a = (a & 0xf0) | vc->vc_ulcolor;
else if (_intensity == 0)
a = (a & 0xf0) | vc->vc_ulcolor;
@@ -392,8 +400,10 @@ static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8
static void update_attr(struct vc_data *vc)
{
- vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
- vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
+ vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
+ vc->vc_blink, vc->vc_underline,
+ vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
+ vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
}
/* Note: inverting the screen twice should revert to the original state */
@@ -934,6 +944,10 @@ int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
+module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
+module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
+module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
+
/*
* gotoxy() must verify all boundaries, because the arguments
* might also be negative. If the given position is out of
@@ -1132,6 +1146,7 @@ static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar posi
static void default_attr(struct vc_data *vc)
{
vc->vc_intensity = 1;
+ vc->vc_italic = 0;
vc->vc_underline = 0;
vc->vc_reverse = 0;
vc->vc_blink = 0;
@@ -1154,6 +1169,9 @@ static void csi_m(struct vc_data *vc)
case 2:
vc->vc_intensity = 0;
break;
+ case 3:
+ vc->vc_italic = 1;
+ break;
case 4:
vc->vc_underline = 1;
break;
@@ -1194,6 +1212,9 @@ static void csi_m(struct vc_data *vc)
case 22:
vc->vc_intensity = 1;
break;
+ case 23:
+ vc->vc_italic = 0;
+ break;
case 24:
vc->vc_underline = 0;
break;
@@ -1454,6 +1475,7 @@ static void save_cur(struct vc_data *vc)
vc->vc_saved_x = vc->vc_x;
vc->vc_saved_y = vc->vc_y;
vc->vc_s_intensity = vc->vc_intensity;
+ vc->vc_s_italic = vc->vc_italic;
vc->vc_s_underline = vc->vc_underline;
vc->vc_s_blink = vc->vc_blink;
vc->vc_s_reverse = vc->vc_reverse;
@@ -1468,6 +1490,7 @@ static void restore_cur(struct vc_data *vc)
{
gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
vc->vc_intensity = vc->vc_s_intensity;
+ vc->vc_italic = vc->vc_s_italic;
vc->vc_underline = vc->vc_s_underline;
vc->vc_blink = vc->vc_s_blink;
vc->vc_reverse = vc->vc_s_reverse;
@@ -1497,7 +1520,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
vc->vc_charset = 0;
vc->vc_need_wrap = 0;
vc->vc_report_mouse = 0;
- vc->vc_utf = 0;
+ vc->vc_utf = default_utf8;
vc->vc_utf_count = 0;
vc->vc_disp_ctrl = 0;
@@ -1930,7 +1953,47 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
* kernel memory allocation is available.
*/
char con_buf[CON_BUF_SIZE];
-DECLARE_MUTEX(con_buf_sem);
+DEFINE_MUTEX(con_buf_mtx);
+
+/* 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)
@@ -1948,6 +2011,10 @@ 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;
@@ -1983,7 +2050,7 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
/* At this point 'buf' is guaranteed to be a kernel buffer
* and therefore no access to userspace (and therefore sleeping)
- * will be needed. The con_buf_sem serializes all tty based
+ * will be needed. The con_buf_mtx serializes all tty based
* console rendering and vcs write/read operations. We hold
* the console spinlock during the entire write.
*/
@@ -2010,53 +2077,86 @@ 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
@@ -2076,56 +2176,80 @@ rescan_last_byte:
&& (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;
}
@@ -2581,6 +2705,11 @@ static void con_close(struct tty_struct *tty, struct file *filp)
mutex_unlock(&tty_mutex);
}
+static int default_italic_color = 2; // green (ASCII)
+static int default_underline_color = 3; // cyan (ASCII)
+module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
+module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
+
static void vc_init(struct vc_data *vc, unsigned int rows,
unsigned int cols, int do_clear)
{
@@ -2600,7 +2729,8 @@ static void vc_init(struct vc_data *vc, unsigned int rows,
vc->vc_palette[k++] = default_blu[j] ;
}
vc->vc_def_color = 0x07; /* white */
- vc->vc_ulcolor = 0x0f; /* bold white */
+ vc->vc_ulcolor = default_underline_color;
+ vc->vc_itcolor = default_italic_color;
vc->vc_halfcolor = 0x08; /* grey */
init_waitqueue_head(&vc->paste_wait);
reset_terminal(vc, do_clear);
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-07 14:59:26 +0000