extractedLnx/linux-2.0.40/drivers/char/console.c_con_write.c
static int con_write(struct tty_struct * tty, int from_user,
const unsigned char *buf, int count)
{
int c, tc, ok, n = 0;
unsigned int currcons;
struct vt_struct *vt = (struct vt_struct *)tty->driver_data;
currcons = vt->vc_num;
if (!vc_cons_allocated(currcons)) {
/* could this happen? */
static int error = 0;
if (!error) {
error = 1;
printk("con_write: tty %d not allocated\n", currcons+1);
}
return 0;
}
if (currcons == sel_cons)
clear_selection();
disable_bh(CONSOLE_BH);
while (!tty->stopped && count) {
enable_bh(CONSOLE_BH);
c = from_user ? get_user(buf) : *buf;
buf++; n++; count--;
disable_bh(CONSOLE_BH);
if (utf) {
/* Combine UTF-8 into Unicode */
/* Incomplete characters silently ignored */
if(c > 0x7f) {
if (utf_count > 0 && (c & 0xc0) == 0x80) {
utf_char = (utf_char << 6) | (c & 0x3f);
utf_count--;
if (utf_count == 0)
tc = c = utf_char;
else continue;
} else {
if ((c & 0xe0) == 0xc0) {
utf_count = 1;
utf_char = (c & 0x1f);
} else if ((c & 0xf0) == 0xe0) {
utf_count = 2;
utf_char = (c & 0x0f);
} else if ((c & 0xf8) == 0xf0) {
utf_count = 3;
utf_char = (c & 0x07);
} else if ((c & 0xfc) == 0xf8) {
utf_count = 4;
utf_char = (c & 0x03);
} else if ((c & 0xfe) == 0xfc) {
utf_count = 5;
utf_char = (c & 0x01);
} else
utf_count = 0;
continue;
}
} else {
tc = c;
utf_count = 0;
}
} else { /* no utf */
tc = translate[toggle_meta ? (c|0x80) : c];
}
/* If the original code was a control character we
* only allow a glyph to be displayed if the code is
* not normally used (such as for cursor movement) or
* if the disp_ctrl mode has been explicitly enabled.
* Certain characters (as given by the CTRL_ALWAYS
* bitmap) are always displayed as control characters,
* as the console would be pretty useless without
* them; to display an arbitrary font position use the
* direct-to-font zone in UTF-8 mode.
*/
ok = tc && (c >= 32 ||
(!utf && !(((disp_ctrl ? CTRL_ALWAYS
: CTRL_ACTION) >> c) & 1)))
&& (c != 127 || disp_ctrl)
&& (c != 128+27);
if (vc_state == ESnormal && ok) {
/* Now try to find out how to display it */
tc = conv_uni_to_pc(tc);
if ( tc == -4 ) {
/* If we got -4 (not found) then see if we have
defined a replacement character (U+FFFD) */
tc = conv_uni_to_pc(0xfffd);
} else if ( tc == -3 ) {
/* Bad hash table -- hope for the best */
tc = c;
}
if (tc & ~console_charmask)
continue; /* Conversion failed */
if (need_wrap) {
cr(currcons);
lf(currcons);
}
if (decim)
insert_char(currcons);
scr_writew( video_mode_512ch ?
((attr & 0xf7) << 8) + ((tc & 0x100) << 3) +
(tc & 0x0ff) : (attr << 8) + tc,
(unsigned short *) pos);
if (x == video_num_columns - 1)
need_wrap = decawm;
else {
x++;
pos+=2;
}
continue;
}
/*
* Control characters can be used in the _middle_
* of an escape sequence.
*/
switch (c) {
case 0:
continue;
case 7:
if (bell_duration)
kd_mksound(bell_pitch, bell_duration);
continue;
case 8:
bs(currcons);
continue;
case 9:
pos -= (x << 1);
while (x < video_num_columns - 1) {
x++;
if (tab_stop[x >> 5] & (1 << (x & 31)))
break;
}
pos += (x << 1);
continue;
case 10: case 11: case 12:
lf(currcons);
if (!is_kbd(lnm))
continue;
case 13:
cr(currcons);
continue;
case 14:
charset = 1;
translate = set_translate(G1_charset);
disp_ctrl = 1;
continue;
case 15:
charset = 0;
translate = set_translate(G0_charset);
disp_ctrl = 0;
continue;
case 24: case 26:
vc_state = ESnormal;
continue;
case 27:
vc_state = ESesc;
continue;
case 127:
del(currcons);
continue;
case 128+27:
vc_state = ESsquare;
continue;
}
switch(vc_state) {
case ESesc:
vc_state = ESnormal;
switch (c) {
case '[':
vc_state = ESsquare;
continue;
case ']':
vc_state = ESnonstd;
continue;
case '%':
vc_state = ESpercent;
continue;
case 'E':
cr(currcons);
lf(currcons);
continue;
case 'M':
ri(currcons);
continue;
case 'D':
lf(currcons);
continue;
case 'H':
tab_stop[x >> 5] |= (1 << (x & 31));
continue;
case 'Z':
respond_ID(tty);
continue;
case '7':
save_cur(currcons);
continue;
case '8':
restore_cur(currcons);
continue;
case '(':
vc_state = ESsetG0;
continue;
case ')':
vc_state = ESsetG1;
continue;
case '#':
vc_state = EShash;
continue;
case 'c':
reset_terminal(currcons,1);
continue;
case '>': /* Numeric keypad */
clr_kbd(kbdapplic);
continue;
case '=': /* Appl. keypad */
set_kbd(kbdapplic);
continue;
}
continue;
case ESnonstd:
if (c=='P') { /* palette escape sequence */
for (npar=0; npar<NPAR; npar++)
par[npar] = 0 ;
npar = 0 ;
vc_state = ESpalette;
continue;
} else if (c=='R') { /* reset palette */
reset_palette (currcons);
vc_state = ESnormal;
} else
vc_state = ESnormal;
continue;
case ESpalette:
if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
par[npar++] = (c>'9' ? (c&0xDF)-'A'+10 : c-'0') ;
if (npar==7) {
int i = par[0]*3, j = 1;
palette[i] = 16*par[j++];
palette[i++] += par[j++];
palette[i] = 16*par[j++];
palette[i++] += par[j++];
palette[i] = 16*par[j++];
palette[i] += par[j];
set_palette() ;
vc_state = ESnormal;
}
} else
vc_state = ESnormal;
continue;
case ESsquare:
for(npar = 0 ; npar < NPAR ; npar++)
par[npar] = 0;
npar = 0;
vc_state = ESgetpars;
if (c == '[') { /* Function key */
vc_state=ESfunckey;
continue;
}
ques = (c=='?');
if (ques)
continue;
case ESgetpars:
if (c==';' && npar<NPAR-1) {
npar++;
continue;
} else if (c>='0' && c<='9') {
par[npar] *= 10;
par[npar] += c-'0';
continue;
} else vc_state=ESgotpars;
case ESgotpars:
vc_state = ESnormal;
switch(c) {
case 'h':
set_mode(currcons,1);
continue;
case 'l':
set_mode(currcons,0);
continue;
case 'n':
if (!ques)
if (par[0] == 5)
status_report(tty);
else if (par[0] == 6)
cursor_report(currcons,tty);
continue;
}
if (ques) {
ques = 0;
continue;
}
switch(c) {
case 'G': case '`':
if (par[0]) par[0]--;
gotoxy(currcons,par[0],y);
continue;
case 'A':
if (!par[0]) par[0]++;
gotoxy(currcons,x,y-par[0]);
continue;
case 'B': case 'e':
if (!par[0]) par[0]++;
gotoxy(currcons,x,y+par[0]);
continue;
case 'C': case 'a':
if (!par[0]) par[0]++;
gotoxy(currcons,x+par[0],y);
continue;
case 'D':
if (!par[0]) par[0]++;
gotoxy(currcons,x-par[0],y);
continue;
case 'E':
if (!par[0]) par[0]++;
gotoxy(currcons,0,y+par[0]);
continue;
case 'F':
if (!par[0]) par[0]++;
gotoxy(currcons,0,y-par[0]);
continue;
case 'd':
if (par[0]) par[0]--;
gotoxay(currcons,x,par[0]);
continue;
case 'H': case 'f':
if (par[0]) par[0]--;
if (par[1]) par[1]--;
gotoxay(currcons,par[1],par[0]);
continue;
case 'J':
csi_J(currcons,par[0]);
continue;
case 'K':
csi_K(currcons,par[0]);
continue;
case 'L':
csi_L(currcons,par[0]);
continue;
case 'M':
csi_M(currcons,par[0]);
continue;
case 'P':
csi_P(currcons,par[0]);
continue;
case 'c':
if (!par[0])
respond_ID(tty);
continue;
case 'g':
if (!par[0])
tab_stop[x >> 5] &= ~(1 << (x & 31));
else if (par[0] == 3) {
tab_stop[0] =
tab_stop[1] =
tab_stop[2] =
tab_stop[3] =
tab_stop[4] = 0;
}
continue;
case 'm':
csi_m(currcons);
continue;
case 'q': /* DECLL - but only 3 leds */
/* map 0,1,2,3 to 0,1,2,4 */
if (par[0] < 4)
setledstate(kbd_table + currcons,
(par[0] < 3) ? par[0] : 4);
continue;
case 'r':
if (!par[0])
par[0]++;
if (!par[1])
par[1] = video_num_lines;
/* Minimum allowed region is 2 lines */
if (par[0] < par[1] &&
par[1] <= video_num_lines) {
top=par[0]-1;
bottom=par[1];
gotoxay(currcons,0,0);
}
continue;
case 's':
save_cur(currcons);
continue;
case 'u':
restore_cur(currcons);
continue;
case 'X':
csi_X(currcons, par[0]);
continue;
case '@':
csi_at(currcons,par[0]);
continue;
case ']': /* setterm functions */
setterm_command(currcons);
continue;
}
continue;
case ESpercent:
vc_state = ESnormal;
switch (c) {
case '@': /* defined in ISO 2022 */
utf = 0;
continue;
case 'G': /* prelim official escape code */
case '8': /* retained for compatibility */
utf = 1;
continue;
}
continue;
case ESfunckey:
vc_state = ESnormal;
continue;
case EShash:
vc_state = ESnormal;
if (c == '8') {
/* DEC screen alignment test. kludge :-) */
video_erase_char =
(video_erase_char & 0xff00) | 'E';
csi_J(currcons, 2);
video_erase_char =
(video_erase_char & 0xff00) | ' ';
}
continue;
case ESsetG0:
if (c == '0')
G0_charset = GRAF_MAP;
else if (c == 'B')
G0_charset = LAT1_MAP;
else if (c == 'U')
G0_charset = IBMPC_MAP;
else if (c == 'K')
G0_charset = USER_MAP;
if (charset == 0)
translate = set_translate(G0_charset);
vc_state = ESnormal;
continue;
case ESsetG1:
if (c == '0')
G1_charset = GRAF_MAP;
else if (c == 'B')
G1_charset = LAT1_MAP;
else if (c == 'U')
G1_charset = IBMPC_MAP;
else if (c == 'K')
G1_charset = USER_MAP;
if (charset == 1)
translate = set_translate(G1_charset);
vc_state = ESnormal;
continue;
default:
vc_state = ESnormal;
}
}
if (vcmode != KD_GRAPHICS)
set_cursor(currcons);
enable_bh(CONSOLE_BH);
return n;
}
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