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putty/terminal.c

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37 KiB
C
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#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "putty.h"
static unsigned long *text; /* buffer of text on terminal screen */
static unsigned long *scrtop; /* top of working screen */
static unsigned long *disptop; /* top of displayed screen */
static unsigned long *sbtop; /* top of scrollback */
static unsigned long *cpos; /* cursor position (convenience) */
static unsigned long *disptext; /* buffer of text on real screen */
static unsigned long *wanttext; /* buffer of text we want on screen */
static unsigned long *alttext; /* buffer of text on alt. screen */
static unsigned char *selspace; /* buffer for building selections in */
#define TSIZE (sizeof(*text))
#define fix_cpos do { cpos = scrtop + curs_y * (cols+1) + curs_x; } while(0)
static unsigned long curr_attr, save_attr;
static int curs_x, curs_y; /* cursor */
static int save_x, save_y; /* saved cursor position */
static int marg_t, marg_b; /* scroll margins */
static int dec_om; /* DEC origin mode flag */
static int wrap, wrapnext; /* wrap flags */
static int insert; /* insert-mode flag */
static int cset; /* 0 or 1: which char set */
static int save_cset, save_csattr; /* saved with cursor position */
static int rvideo; /* global reverse video flag */
static unsigned long cset_attr[2];
/*
* Saved settings on the alternate screen.
*/
static int alt_x, alt_y, alt_om, alt_wrap, alt_wnext, alt_ins, alt_cset;
static int alt_t, alt_b;
static int alt_which;
#define ARGS_MAX 32 /* max # of esc sequence arguments */
#define ARG_DEFAULT -1 /* if an arg isn't specified */
#define def(a,d) ( (a) == ARG_DEFAULT ? (d) : (a) )
static int esc_args[ARGS_MAX];
static int esc_nargs;
static int esc_query;
#define OSC_STR_MAX 2048
static int osc_strlen;
static char osc_string[OSC_STR_MAX+1];
static int osc_w;
static unsigned char *tabs;
#define MAXNL 5
static int nl_count;
static int scroll_heuristic;
static enum {
TOPLEVEL, IGNORE_NEXT,
SEEN_ESC, SEEN_CSI, SET_GL, SET_GR,
SEEN_OSC, SEEN_OSC_P, SEEN_OSC_W, OSC_STRING, OSC_MAYBE_ST,
SEEN_ESCHASH
} termstate;
static enum {
NO_SELECTION, ABOUT_TO, DRAGGING, SELECTED
} selstate;
static enum {
SM_CHAR, SM_WORD, SM_LINE
} selmode;
static unsigned long *selstart, *selend, *selanchor;
static short wordness[256] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 01 */
0,1,2,1,1,1,1,1,1,1,1,1,1,2,2,2, 2,2,2,2,2,2,2,2,2,2,1,1,1,1,1,1, /* 23 */
1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,1,1,1,1,2, /* 45 */
1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,1,1,1,1,1, /* 67 */
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 89 */
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* AB */
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2, /* CD */
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2, /* EF */
};
static unsigned char sel_nl[] = SEL_NL;
/*
* Internal prototypes.
*/
static void do_paint (Context, int);
static void erase_lots (int, int, int);
static void swap_screen (int);
static void update_sbar (void);
static void deselect (void);
/*
* Set up power-on settings for the terminal.
*/
static void power_on(void) {
curs_x = curs_y = alt_x = alt_y = save_x = save_y = 0;
alt_t = marg_t = 0;
if (rows != -1)
alt_b = marg_b = rows - 1;
else
alt_b = marg_b = 0;
if (cols != -1) {
int i;
for (i = 0; i < cols; i++)
tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
}
alt_om = dec_om = cfg.dec_om;
alt_wnext = wrapnext = alt_ins = insert = FALSE;
alt_wrap = wrap = cfg.wrap_mode;
alt_cset = cset = 0;
cset_attr[0] = cset_attr[1] = ATTR_ASCII;
rvideo = 0;
save_attr = curr_attr = ATTR_DEFAULT;
app_cursor_keys = cfg.app_cursor;
app_keypad_keys = cfg.app_keypad;
alt_which = 0;
{
int i;
for (i = 0; i < 256; i++)
wordness[i] = cfg.wordness[i];
}
if (text) {
swap_screen (1);
erase_lots (FALSE, TRUE, TRUE);
swap_screen (0);
erase_lots (FALSE, TRUE, TRUE);
}
}
/*
* Force a screen update.
*/
void term_update(void) {
Context ctx;
ctx = get_ctx();
if (ctx) {
do_paint (ctx, TRUE);
free_ctx (ctx);
nl_count = 0;
scroll_heuristic = 0;
}
}
/*
* Same as power_on(), but an external function.
*/
void term_pwron(void) {
power_on();
fix_cpos;
disptop = scrtop;
deselect();
term_update();
}
/*
* Clear the scrollback.
*/
void term_clrsb(void) {
disptop = sbtop = scrtop;
update_sbar();
}
/*
* Initialise the terminal.
*/
void term_init(void) {
text = sbtop = scrtop = disptop = cpos = NULL;
disptext = wanttext = NULL;
tabs = NULL;
selspace = NULL;
deselect();
rows = cols = -1;
nl_count = 0;
power_on();
}
/*
* Set up the terminal for a given size.
*/
void term_size(int newrows, int newcols, int newsavelines) {
unsigned long *newtext, *newdisp, *newwant, *newalt;
int i, j, crows, ccols;
if (newrows == rows && newcols == cols && newsavelines == savelines)
return; /* nothing to do */
alt_t = marg_t = 0;
alt_b = marg_b = newrows - 1;
newtext = smalloc ((newrows+newsavelines)*(newcols+1)*TSIZE);
disptop = newtext + newsavelines*(newcols+1);
for (i=0; i<(newrows+newsavelines)*(newcols+1); i++)
newtext[i] = ERASE_CHAR;
if (rows != -1) {
crows = rows + (scrtop - sbtop) / (cols+1);
if (crows > newrows+newsavelines)
crows = newrows+newsavelines;
ccols = (cols < newcols ? cols : newcols);
for (i=0; i<crows; i++) {
int oldidx = (rows + savelines - crows + i) * (cols+1);
int newidx = (newrows + newsavelines - crows + i) * (newcols+1);
for (j=0; j<ccols; j++)
newtext[newidx+j] = text[oldidx+j];
newtext[newidx+newcols] =
(cols == newcols ? text[oldidx+cols] : 0);
}
sbtop = disptop - (crows - newrows) * (newcols+1);
if (sbtop > disptop)
sbtop = disptop;
} else
sbtop = disptop;
scrtop = disptop;
sfree (text);
text = newtext;
newdisp = smalloc (newrows*(newcols+1)*TSIZE);
for (i=0; i<newrows*(newcols+1); i++)
newdisp[i] = ATTR_INVALID;
sfree (disptext);
disptext = newdisp;
newwant = smalloc (newrows*(newcols+1)*TSIZE);
for (i=0; i<newrows*(newcols+1); i++)
newwant[i] = ATTR_INVALID;
sfree (wanttext);
wanttext = newwant;
newalt = smalloc (newrows*(newcols+1)*TSIZE);
for (i=0; i<newrows*(newcols+1); i++)
newalt[i] = ERASE_CHAR;
sfree (alttext);
alttext = newalt;
sfree (selspace);
selspace = smalloc ( (newrows+newsavelines) * (newcols+sizeof(sel_nl)) );
tabs = srealloc (tabs, newcols*sizeof(*tabs));
{
int i;
for (i = (cols > 0 ? cols : 0); i < newcols; i++)
tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
}
if (rows > 0)
curs_y += newrows - rows;
if (curs_y < 0)
curs_y = 0;
if (curs_y >= newrows)
curs_y = newrows-1;
if (curs_x >= newcols)
curs_x = newcols-1;
alt_x = alt_y = 0;
wrapnext = alt_wnext = FALSE;
rows = newrows;
cols = newcols;
savelines = newsavelines;
fix_cpos;
deselect();
update_sbar();
term_update();
}
/*
* Swap screens.
*/
static void swap_screen (int which) {
int t;
unsigned long tt;
if (which == alt_which)
return;
alt_which = which;
for (t=0; t<rows*(cols+1); t++) {
tt = scrtop[t]; scrtop[t] = alttext[t]; alttext[t] = tt;
}
t = curs_x; curs_x = alt_x; alt_x = t;
t = curs_y; curs_y = alt_y; alt_y = t;
t = marg_t; marg_t = alt_t; alt_t = t;
t = marg_b; marg_b = alt_b; alt_b = t;
t = dec_om; dec_om = alt_om; alt_om = t;
t = wrap; wrap = alt_wrap; alt_wrap = t;
t = wrapnext; wrapnext = alt_wnext; alt_wnext = t;
t = insert; insert = alt_ins; alt_ins = t;
t = cset; cset = alt_cset; alt_cset = t;
fix_cpos;
}
/*
* Retrieve a character from `inbuf'.
*/
static int inbuf_getc(void) {
if (inbuf_head == inbuf_reap)
return -1; /* EOF */
else {
int n = inbuf_reap;
inbuf_reap = (inbuf_reap+1) & INBUF_MASK;
return inbuf[n];
}
}
/*
* Update the scroll bar.
*/
static void update_sbar(void) {
int min;
min = (sbtop - text) / (cols+1);
set_sbar ((scrtop - text) / (cols+1) + rows - min,
(disptop - text) / (cols+1) - min,
rows);
}
/*
* Check whether the region bounded by the two pointers intersects
* the scroll region, and de-select the on-screen selection if so.
*/
static void check_selection (unsigned long *from, unsigned long *to) {
if (from < selend && selstart < to)
deselect();
}
/*
* Scroll the screen. (`lines' is +ve for scrolling forward, -ve
* for backward.) `sb' is TRUE if the scrolling is permitted to
* affect the scrollback buffer.
*/
static void scroll (int topline, int botline, int lines, int sb) {
unsigned long *scroll_top;
int scroll_size, size, i;
scroll_top = scrtop + topline*(cols+1);
size = (lines < 0 ? -lines : lines) * (cols+1);
scroll_size = (botline - topline + 1) * (cols+1) - size;
if (lines > 0 && topline == 0 && botline == (rows-1) && sb) {
/*
* Since we're going to scroll the whole screen upwards,
* let's also affect the scrollback buffer.
*/
sbtop -= lines * (cols+1);
if (sbtop < text)
sbtop = text;
scroll_size += scroll_top - sbtop;
scroll_top = sbtop;
update_sbar();
}
if (scroll_size < 0) {
size += scroll_size;
scroll_size = 0;
}
if (lines > 0) {
if (scroll_size)
memmove (scroll_top, scroll_top + size, scroll_size*TSIZE);
for (i = 0; i < size; i++)
scroll_top[i+scroll_size] = ERASE_CHAR;
if (selstart > scroll_top &&
selstart < scroll_top + size + scroll_size) {
selstart -= size;
if (selstart < scroll_top)
selstart = scroll_top;
}
if (selend > scroll_top &&
selend < scroll_top + size + scroll_size) {
selend -= size;
if (selend < scroll_top)
selend = scroll_top;
}
} else {
if (scroll_size)
memmove (scroll_top + size, scroll_top, scroll_size*TSIZE);
for (i = 0; i < size; i++)
scroll_top[i] = ERASE_CHAR;
if (selstart > scroll_top &&
selstart < scroll_top + size + scroll_size) {
selstart += size;
if (selstart > scroll_top + size + scroll_size)
selstart = scroll_top + size + scroll_size;
}
if (selend > scroll_top &&
selend < scroll_top + size + scroll_size) {
selend += size;
if (selend > scroll_top + size + scroll_size)
selend = scroll_top + size + scroll_size;
}
}
scroll_heuristic += lines;
}
/*
* Move the cursor to a given position, clipping at boundaries. We
* may or may not want to clip at the scroll margin: marg_clip is 0
* not to, 1 to disallow _passing_ the margins, and 2 to disallow
* even _being_ outside the margins.
*/
static void move (int x, int y, int marg_clip) {
if (x < 0)
x = 0;
if (x >= cols)
x = cols-1;
if (marg_clip) {
if ((curs_y >= marg_t || marg_clip == 2) && y < marg_t)
y = marg_t;
if ((curs_y <= marg_b || marg_clip == 2) && y > marg_b)
y = marg_b;
}
if (y < 0)
y = 0;
if (y >= rows)
y = rows-1;
curs_x = x;
curs_y = y;
fix_cpos;
wrapnext = FALSE;
}
/*
* Save or restore the cursor and SGR mode.
*/
static void save_cursor(int save) {
if (save) {
save_x = curs_x;
save_y = curs_y;
save_attr = curr_attr;
save_cset = cset;
save_csattr = cset_attr[cset];
} else {
curs_x = save_x;
curs_y = save_y;
curr_attr = save_attr;
cset = save_cset;
cset_attr[cset] = save_csattr;
fix_cpos;
}
}
/*
* Erase a large portion of the screen: the whole screen, or the
* whole line, or parts thereof.
*/
static void erase_lots (int line_only, int from_begin, int to_end) {
unsigned long *startpos, *endpos;
if (line_only) {
startpos = cpos - curs_x;
endpos = startpos + cols+1;
} else {
startpos = scrtop;
endpos = startpos + rows * (cols+1);
}
if (!from_begin)
startpos = cpos;
if (!to_end)
endpos = cpos;
check_selection (startpos, endpos);
while (startpos < endpos)
*startpos++ = ERASE_CHAR;
}
/*
* Insert or delete characters within the current line. n is +ve if
* insertion is desired, and -ve for deletion.
*/
static void insch (int n) {
int dir = (n < 0 ? -1 : +1);
int m;
n = (n < 0 ? -n : n);
if (n > cols - curs_x)
n = cols - curs_x;
m = cols - curs_x - n;
check_selection (cpos, cpos+n);
if (dir < 0) {
memmove (cpos, cpos+n, m*TSIZE);
while (n--)
cpos[m++] = ERASE_CHAR;
} else {
memmove (cpos+n, cpos, m*TSIZE);
while (n--)
cpos[n] = ERASE_CHAR;
}
}
/*
* Toggle terminal mode `mode' to state `state'. (`query' indicates
* whether the mode is a DEC private one or a normal one.)
*/
static void toggle_mode (int mode, int query, int state) {
if (query) switch (mode) {
case 1: /* application cursor keys */
app_cursor_keys = state;
break;
case 3: /* 80/132 columns */
deselect();
request_resize (state ? 132 : 80, rows);
break;
case 5: /* reverse video */
rvideo = state;
disptop = scrtop;
break;
case 6: /* DEC origin mode */
dec_om = state;
break;
case 7: /* auto wrap */
wrap = state;
break;
case 47: /* alternate screen */
deselect();
swap_screen (state);
disptop = scrtop;
break;
} else switch (mode) {
case 4: /* set insert mode */
insert = state;
break;
}
}
/*
* Process an OSC sequence: set window title or icon name.
*/
static void do_osc(void) {
if (osc_w) {
while (osc_strlen--)
wordness[(unsigned char)osc_string[osc_strlen]] = esc_args[0];
} else {
osc_string[osc_strlen] = '\0';
switch (esc_args[0]) {
case 0:
case 1:
set_icon (osc_string);
if (esc_args[0] == 1)
break;
/* fall through: parameter 0 means set both */
case 2:
case 21:
set_title (osc_string);
break;
}
}
}
/*
* Remove everything currently in `inbuf' and stick it up on the
* in-memory display. There's a big state machine in here to
* process escape sequences...
*/
void term_out(void) {
int c;
int must_update = FALSE;
while ( (c = inbuf_getc()) != -1) {
#ifdef LOG
{
static FILE *fp = NULL;
if (!fp) fp = fopen("putty.log", "wb");
if (fp) fputc (c, fp);
}
#endif
switch (termstate) {
case TOPLEVEL:
do_toplevel:
switch (c) {
case '\005': /* terminal type query */
ldisc->send ("\033[?1;2c", 7);
break;
case '\007':
beep();
disptop = scrtop;
must_update = TRUE;
break;
case '\b':
if (curs_x == 0 && curs_y > 0)
curs_x = cols-1, curs_y--;
else if (wrapnext)
wrapnext = FALSE;
else
curs_x--;
fix_cpos;
disptop = scrtop;
must_update = TRUE;
break;
case '\016':
cset = 1;
break;
case '\017':
cset = 0;
break;
case '\033':
termstate = SEEN_ESC;
break;
case 0233:
termstate = SEEN_CSI;
esc_nargs = 1;
esc_args[0] = ARG_DEFAULT;
esc_query = FALSE;
break;
case 0235:
termstate = SEEN_OSC;
esc_args[0] = 0;
break;
case '\r':
curs_x = 0;
wrapnext = FALSE;
fix_cpos;
disptop = scrtop;
must_update = TRUE;
break;
case '\013':
case '\014':
case '\n':
if (curs_y == marg_b)
scroll (marg_t, marg_b, 1, TRUE);
else if (curs_y < rows-1)
curs_y++;
if (cfg.lfhascr)
curs_x = 0;
fix_cpos;
wrapnext = FALSE;
disptop = scrtop;
nl_count++;
break;
case '\t':
do {
curs_x++;
} while (curs_x < cols-1 && !tabs[curs_x]);
if (curs_x >= cols)
curs_x = cols-1;
{
unsigned long *old_cpos = cpos;
fix_cpos;
check_selection (old_cpos, cpos);
}
disptop = scrtop;
must_update = TRUE;
break;
default:
if (c >= ' ' && c != 0234) {
if (wrapnext) {
cpos[1] = ATTR_WRAPPED;
if (curs_y == marg_b)
scroll (marg_t, marg_b, 1, TRUE);
else if (curs_y < rows-1)
curs_y++;
curs_x = 0;
fix_cpos;
wrapnext = FALSE;
nl_count++;
}
if (insert)
insch (1);
check_selection (cpos, cpos+1);
*cpos++ = xlat_tty2scr((unsigned char)c) | curr_attr |
(c <= 0x7F ? cset_attr[cset] : ATTR_ASCII);
curs_x++;
if (curs_x == cols) {
cpos--;
curs_x--;
wrapnext = wrap;
}
disptop = scrtop;
}
}
break;
case IGNORE_NEXT:
termstate = TOPLEVEL;
break;
case OSC_MAYBE_ST:
/*
* This state is virtually identical to SEEN_ESC, with the
* exception that we have an OSC sequence in the pipeline,
* and _if_ we see a backslash, we process it.
*/
if (c == '\\') {
do_osc();
termstate = TOPLEVEL;
break;
}
/* else fall through */
case SEEN_ESC:
termstate = TOPLEVEL;
switch (c) {
case '\005': case '\007': case '\b': case '\016': case '\017':
case '\033': case 0233: case 0234: case 0235: case '\r':
case '\013': case '\014': case '\n': case '\t':
termstate = TOPLEVEL;
goto do_toplevel; /* hack... */
case ' ': /* some weird sequence? */
termstate = IGNORE_NEXT;
break;
case '[': /* enter CSI mode */
termstate = SEEN_CSI;
esc_nargs = 1;
esc_args[0] = ARG_DEFAULT;
esc_query = FALSE;
break;
case ']': /* xterm escape sequences */
termstate = SEEN_OSC;
esc_args[0] = 0;
break;
case '(': /* should set GL */
termstate = SET_GL;
break;
case ')': /* should set GR */
termstate = SET_GR;
break;
case '7': /* save cursor */
save_cursor (TRUE);
break;
case '8': /* restore cursor */
save_cursor (FALSE);
disptop = scrtop;
must_update = TRUE;
break;
case '=':
app_keypad_keys = TRUE;
break;
case '>':
app_keypad_keys = FALSE;
break;
case 'D': /* exactly equivalent to LF */
if (curs_y == marg_b)
scroll (marg_t, marg_b, 1, TRUE);
else if (curs_y < rows-1)
curs_y++;
fix_cpos;
wrapnext = FALSE;
disptop = scrtop;
nl_count++;
break;
case 'E': /* exactly equivalent to CR-LF */
curs_x = 0;
wrapnext = FALSE;
if (curs_y == marg_b)
scroll (marg_t, marg_b, 1, TRUE);
else if (curs_y < rows-1)
curs_y++;
fix_cpos;
wrapnext = FALSE;
nl_count++;
disptop = scrtop;
break;
case 'M': /* reverse index - backwards LF */
if (curs_y == marg_t)
scroll (marg_t, marg_b, -1, TRUE);
else if (curs_y > 0)
curs_y--;
fix_cpos;
wrapnext = FALSE;
disptop = scrtop;
must_update = TRUE;
break;
case 'Z': /* terminal type query */
ldisc->send ("\033[?6c", 5);
break;
case 'c': /* restore power-on settings */
power_on();
fix_cpos;
disptop = scrtop;
must_update = TRUE;
break;
case '#': /* ESC # 8 fills screen with Es :-) */
termstate = SEEN_ESCHASH;
break;
case 'H': /* set a tab */
tabs[curs_x] = TRUE;
break;
}
break;
case SEEN_CSI:
termstate = TOPLEVEL; /* default */
switch (c) {
case '\005': case '\007': case '\b': case '\016': case '\017':
case '\033': case 0233: case 0234: case 0235: case '\r':
case '\013': case '\014': case '\n': case '\t':
termstate = TOPLEVEL;
goto do_toplevel; /* hack... */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (esc_nargs <= ARGS_MAX) {
if (esc_args[esc_nargs-1] == ARG_DEFAULT)
esc_args[esc_nargs-1] = 0;
esc_args[esc_nargs-1] =
10 * esc_args[esc_nargs-1] + c - '0';
}
termstate = SEEN_CSI;
break;
case ';':
if (++esc_nargs <= ARGS_MAX)
esc_args[esc_nargs-1] = ARG_DEFAULT;
termstate = SEEN_CSI;
break;
case '?':
esc_query = TRUE;
termstate = SEEN_CSI;
break;
case 'A': /* move up N lines */
move (curs_x, curs_y - def(esc_args[0], 1), 1);
disptop = scrtop;
must_update = TRUE;
break;
case 'B': case 'e': /* move down N lines */
move (curs_x, curs_y + def(esc_args[0], 1), 1);
disptop = scrtop;
must_update = TRUE;
break;
case 'C': case 'a': /* move right N cols */
move (curs_x + def(esc_args[0], 1), curs_y, 1);
disptop = scrtop;
must_update = TRUE;
break;
case 'D': /* move left N cols */
move (curs_x - def(esc_args[0], 1), curs_y, 1);
disptop = scrtop;
must_update = TRUE;
break;
case 'E': /* move down N lines and CR */
move (0, curs_y + def(esc_args[0], 1), 1);
disptop = scrtop;
must_update = TRUE;
break;
case 'F': /* move up N lines and CR */
move (0, curs_y - def(esc_args[0], 1), 1);
disptop = scrtop;
must_update = TRUE;
break;
case 'G': case '`': /* set horizontal posn */
move (def(esc_args[0], 1) - 1, curs_y, 0);
disptop = scrtop;
must_update = TRUE;
break;
case 'd': /* set vertical posn */
move (curs_x, (dec_om ? marg_t : 0) + def(esc_args[0], 1) - 1,
(dec_om ? 2 : 0));
disptop = scrtop;
must_update = TRUE;
break;
case 'H': case 'f': /* set horz and vert posns at once */
if (esc_nargs < 2)
esc_args[1] = ARG_DEFAULT;
move (def(esc_args[1], 1) - 1,
(dec_om ? marg_t : 0) + def(esc_args[0], 1) - 1,
(dec_om ? 2 : 0));
disptop = scrtop;
must_update = TRUE;
break;
case 'J': /* erase screen or parts of it */
{
unsigned int i = def(esc_args[0], 0) + 1;
if (i > 3)
i = 0;
erase_lots(FALSE, !!(i & 2), !!(i & 1));
}
disptop = scrtop;
must_update = TRUE;
break;
case 'K': /* erase line or parts of it */
{
unsigned int i = def(esc_args[0], 0) + 1;
if (i > 3)
i = 0;
erase_lots(TRUE, !!(i & 2), !!(i & 1));
}
disptop = scrtop;
must_update = TRUE;
break;
case 'L': /* insert lines */
if (curs_y <= marg_b)
scroll (curs_y, marg_b, -def(esc_args[0], 1), FALSE);
disptop = scrtop;
must_update = TRUE;
break;
case 'M': /* delete lines */
if (curs_y <= marg_b)
scroll (curs_y, marg_b, def(esc_args[0], 1), FALSE);
disptop = scrtop;
must_update = TRUE;
break;
case '@': /* insert chars */
insch (def(esc_args[0], 1));
disptop = scrtop;
must_update = TRUE;
break;
case 'P': /* delete chars */
insch (-def(esc_args[0], 1));
disptop = scrtop;
must_update = TRUE;
break;
case 'c': /* terminal type query */
ldisc->send ("\033[?6c", 5);
break;
case 'n': /* cursor position query */
if (esc_args[0] == 6) {
char buf[32];
sprintf (buf, "\033[%d;%dR", curs_y + 1, curs_x + 1);
ldisc->send (buf, strlen(buf));
}
break;
case 'h': /* toggle a mode to high */
toggle_mode (esc_args[0], esc_query, TRUE);
break;
case 'l': /* toggle a mode to low */
toggle_mode (esc_args[0], esc_query, FALSE);
break;
case 'g': /* clear tabs */
if (esc_nargs == 1) {
if (esc_args[0] == 0) {
tabs[curs_x] = FALSE;
} else if (esc_args[0] == 3) {
int i;
for (i = 0; i < cols; i++)
tabs[i] = FALSE;
}
}
break;
case 'r': /* set scroll margins */
if (!esc_query && esc_nargs <= 2) {
int top, bot;
top = def(esc_args[0], 1) - 1;
if (top < 0)
top = 0;
bot = (esc_nargs <= 1 || esc_args[1] == 0 ? rows :
def(esc_args[1], rows)) - 1;
if (bot >= rows)
bot = rows-1;
if (top <= bot) {
marg_t = top;
marg_b = bot;
curs_x = 0;
/*
* I used to think the cursor should be
* placed at the top of the newly marginned
* area. Apparently not: VMS TPU falls over
* if so.
*/
curs_y = 0;
fix_cpos;
disptop = scrtop;
must_update = TRUE;
}
}
break;
case 'm': /* set graphics rendition */
{
int i;
for (i=0; i<esc_nargs; i++) {
switch (def(esc_args[i], 0)) {
case 0: /* restore defaults */
curr_attr = ATTR_DEFAULT; break;
case 1: /* enable bold */
curr_attr |= ATTR_BOLD; break;
case 4: /* enable underline */
case 21: /* (enable double underline) */
curr_attr |= ATTR_UNDER; break;
case 7: /* enable reverse video */
curr_attr |= ATTR_REVERSE; break;
case 22: /* disable bold */
curr_attr &= ~ATTR_BOLD; break;
case 24: /* disable underline */
curr_attr &= ~ATTR_UNDER; break;
case 27: /* disable reverse video */
curr_attr &= ~ATTR_REVERSE; break;
case 30: case 31: case 32: case 33:
case 34: case 35: case 36: case 37:
/* foreground */
curr_attr &= ~ATTR_FGMASK;
curr_attr |= (esc_args[i] - 30) << ATTR_FGSHIFT;
break;
case 39: /* default-foreground */
curr_attr &= ~ATTR_FGMASK;
curr_attr |= ATTR_DEFFG;
break;
case 40: case 41: case 42: case 43:
case 44: case 45: case 46: case 47:
/* background */
curr_attr &= ~ATTR_BGMASK;
curr_attr |= (esc_args[i] - 40) << ATTR_BGSHIFT;
break;
case 49: /* default-background */
curr_attr &= ~ATTR_BGMASK;
curr_attr |= ATTR_DEFBG;
break;
}
}
}
break;
case 's': /* save cursor */
save_cursor (TRUE);
break;
case 'u': /* restore cursor */
save_cursor (FALSE);
disptop = scrtop;
must_update = TRUE;
break;
case 't': /* set page size - ie window height */
request_resize (cols, def(esc_args[0], 24));
deselect();
break;
case 'X': /* write N spaces w/o moving cursor */
{
int n = def(esc_args[0], 1);
unsigned long *p = cpos;
if (n > cols - curs_x)
n = cols - curs_x;
check_selection (cpos, cpos+n);
while (n--)
*p++ = ERASE_CHAR;
disptop = scrtop;
must_update = TRUE;
}
break;
case 'x': /* report terminal characteristics */
{
char buf[32];
int i = def(esc_args[0], 0);
if (i == 0 || i == 1) {
strcpy (buf, "\033[2;1;1;112;112;1;0x");
buf[2] += i;
ldisc->send (buf, 20);
}
}
break;
}
break;
case SET_GL:
case SET_GR:
switch (c) {
case 'A':
cset_attr[termstate == SET_GL ? 0 : 1] = ATTR_GBCHR;
break;
case '0':
cset_attr[termstate == SET_GL ? 0 : 1] = ATTR_LINEDRW;
break;
default: /* specifically, 'B' */
cset_attr[termstate == SET_GL ? 0 : 1] = ATTR_ASCII;
break;
}
termstate = TOPLEVEL;
break;
case SEEN_OSC:
osc_w = FALSE;
switch (c) {
case '\005': case '\007': case '\b': case '\016': case '\017':
case '\033': case 0233: case 0234: case 0235: case '\r':
case '\013': case '\014': case '\n': case '\t':
termstate = TOPLEVEL;
goto do_toplevel; /* hack... */
case 'P': /* Linux palette sequence */
termstate = SEEN_OSC_P;
osc_strlen = 0;
break;
case 'R': /* Linux palette reset */
palette_reset();
term_invalidate();
termstate = TOPLEVEL;
break;
case 'W': /* word-set */
termstate = SEEN_OSC_W;
osc_w = TRUE;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
esc_args[0] = 10 * esc_args[0] + c - '0';
break;
case 'L':
/*
* Grotty hack to support xterm and DECterm title
* sequences concurrently.
*/
if (esc_args[0] == 2) {
esc_args[0] = 1;
break;
}
/* else fall through */
default:
termstate = OSC_STRING;
osc_strlen = 0;
}
break;
case OSC_STRING:
if (c == 0234 || c == '\007') {
/*
* These characters terminate the string; ST and BEL
* terminate the sequence and trigger instant
* processing of it, whereas ESC goes back to SEEN_ESC
* mode unless it is followed by \, in which case it is
* synonymous with ST in the first place.
*/
do_osc();
termstate = TOPLEVEL;
} else if (c == '\033')
termstate = OSC_MAYBE_ST;
else if (osc_strlen < OSC_STR_MAX)
osc_string[osc_strlen++] = c;
break;
case SEEN_OSC_P:
{
int max = (osc_strlen == 0 ? 21 : 16);
int val;
if (c >= '0' && c <= '9')
val = c - '0';
else if (c >= 'A' && c <= 'A'+max-10)
val = c - 'A' + 10;
else if (c >= 'a' && c <= 'a'+max-10)
val = c - 'a' + 10;
else
termstate = TOPLEVEL;
osc_string[osc_strlen++] = val;
if (osc_strlen >= 7) {
palette_set (osc_string[0],
osc_string[1] * 16 + osc_string[2],
osc_string[3] * 16 + osc_string[4],
osc_string[5] * 16 + osc_string[6]);
term_invalidate();
termstate = TOPLEVEL;
}
}
break;
case SEEN_OSC_W:
switch (c) {
case '\005': case '\007': case '\b': case '\016': case '\017':
case '\033': case 0233: case 0234: case 0235: case '\r':
case '\013': case '\014': case '\n': case '\t':
termstate = TOPLEVEL;
goto do_toplevel; /* hack... */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
esc_args[0] = 10 * esc_args[0] + c - '0';
break;
default:
termstate = OSC_STRING;
osc_strlen = 0;
}
break;
case SEEN_ESCHASH:
if (c == '8') {
unsigned long *p = scrtop;
int n = rows * (cols+1);
while (n--)
*p++ = ATTR_DEFAULT | 'E';
disptop = scrtop;
must_update = TRUE;
check_selection (scrtop, scrtop + rows * (cols+1));
}
termstate = TOPLEVEL;
break;
}
check_selection (cpos, cpos+1);
}
if (must_update || nl_count > MAXNL)
term_update();
}
/*
* Compare two lines to determine whether they are sufficiently
* alike to scroll-optimise one to the other. Return the degree of
* similarity.
*/
static int linecmp (unsigned long *a, unsigned long *b) {
int i, n;
for (i=n=0; i < cols; i++)
n += (*a++ == *b++);
return n;
}
/*
* Given a context, update the window. Out of paranoia, we don't
* allow WM_PAINT responses to do scrolling optimisations.
*/
static void do_paint (Context ctx, int may_optimise){
int i, j, start, our_curs_y;
unsigned long attr, rv, cursor;
char ch[1024];
cursor = (has_focus ? ATTR_ACTCURS : ATTR_PASCURS);
rv = (rvideo ? ATTR_REVERSE : 0);
our_curs_y = curs_y + (scrtop - disptop) / (cols+1);
for (i=0; i<rows; i++) {
int idx = i*(cols+1);
for (j=0; j<=cols; j++,idx++) {
unsigned long *d = disptop+idx;
wanttext[idx] = ((*d ^ rv
^ (selstart <= d && d < selend ?
ATTR_REVERSE : 0)) |
(i==our_curs_y && j==curs_x ? cursor : 0));
}
}
/*
* We would perform scrolling optimisations in here, if they
* didn't have a nasty tendency to cause the whole sodding
* program to hang for a second at speed-critical moments.
* We'll leave it well alone...
*/
for (i=0; i<rows; i++) {
int idx = i*(cols+1);
start = -1;
for (j=0; j<=cols; j++,idx++) {
unsigned long t = wanttext[idx];
int needs_update = (j < cols && t != disptext[idx]);
int keep_going = (start != -1 && needs_update &&
(t & ATTR_MASK) == attr &&
j-start < sizeof(ch));
if (start != -1 && !keep_going) {
do_text (ctx, start, i, ch, j-start, attr);
start = -1;
}
if (needs_update) {
if (start == -1) {
start = j;
attr = t & ATTR_MASK;
}
ch[j-start] = (char) (t & CHAR_MASK);
}
disptext[idx] = t;
}
}
}
/*
* Invalidate the whole screen so it will be repainted in full.
*/
void term_invalidate(void) {
int i;
for (i=0; i<rows*(cols+1); i++)
disptext[i] = ATTR_INVALID;
}
/*
* Paint the window in response to a WM_PAINT message.
*/
void term_paint (Context ctx, int l, int t, int r, int b) {
int i, j, left, top, right, bottom;
left = l / font_width;
right = (r - 1) / font_width;
top = t / font_height;
bottom = (b - 1) / font_height;
for (i = top; i <= bottom && i < rows ; i++)
for (j = left; j <= right && j < cols ; j++)
disptext[i*(cols+1)+j] = ATTR_INVALID;
do_paint (ctx, FALSE);
}
/*
* Attempt to scroll the scrollback. The second parameter gives the
* position we want to scroll to; the first is +1 to denote that
* this position is relative to the beginning of the scrollback, -1
* to denote it is relative to the end, and 0 to denote that it is
* relative to the current position.
*/
void term_scroll (int rel, int where) {
int n = where * (cols+1);
disptop = (rel < 0 ? scrtop :
rel > 0 ? sbtop : disptop) + n;
if (disptop < sbtop)
disptop = sbtop;
if (disptop > scrtop)
disptop = scrtop;
update_sbar();
term_update();
}
/*
* Spread the selection outwards according to the selection mode.
*/
static unsigned long *sel_spread_half (unsigned long *p, int dir) {
unsigned long *linestart, *lineend;
int x;
short wvalue;
x = (p - text) % (cols+1);
linestart = p - x;
lineend = linestart + cols;
switch (selmode) {
case SM_CHAR:
/*
* In this mode, every character is a separate unit, except
* for runs of spaces at the end of a non-wrapping line.
*/
if (!(linestart[cols] & ATTR_WRAPPED)) {
unsigned long *q = lineend;
while (q > linestart && (q[-1] & CHAR_MASK) == 0x20)
q--;
if (q == lineend)
q--;
if (p >= q)
p = (dir == -1 ? q : lineend - 1);
}
break;
case SM_WORD:
/*
* In this mode, the units are maximal runs of characters
* whose `wordness' has the same value.
*/
wvalue = wordness[*p & CHAR_MASK];
if (dir == +1) {
while (p < lineend && wordness[p[1] & CHAR_MASK] == wvalue)
p++;
} else {
while (p > linestart && wordness[p[-1] & CHAR_MASK] == wvalue)
p--;
}
break;
case SM_LINE:
/*
* In this mode, every line is a unit.
*/
p = (dir == -1 ? linestart : lineend - 1);
break;
}
return p;
}
static void sel_spread (void) {
selstart = sel_spread_half (selstart, -1);
selend = sel_spread_half (selend - 1, +1) + 1;
}
void term_mouse (Mouse_Button b, Mouse_Action a, int x, int y) {
unsigned long *selpoint;
if (y<0) y = 0;
if (y>=rows) y = rows-1;
if (x<0) {
if (y > 0) {
x = cols-1;
y--;
} else
x = 0;
}
if (x>=cols) x = cols-1;
selpoint = disptop + y * (cols+1) + x;
if (b == MB_SELECT && a == MA_CLICK) {
deselect();
selstate = ABOUT_TO;
selanchor = selpoint;
selmode = SM_CHAR;
} else if (b == MB_SELECT && (a == MA_2CLK || a == MA_3CLK)) {
deselect();
selmode = (a == MA_2CLK ? SM_WORD : SM_LINE);
selstate = DRAGGING;
selstart = selanchor = selpoint;
selend = selstart + 1;
sel_spread();
} else if ((b == MB_SELECT && a == MA_DRAG) ||
(b == MB_EXTEND && a != MA_RELEASE)) {
if (selstate == ABOUT_TO && selanchor == selpoint)
return;
if (b == MB_EXTEND && a != MA_DRAG && selstate == SELECTED) {
if (selpoint-selstart < (selend-selstart)/2)
selanchor = selend - 1;
else
selanchor = selstart;
selstate = DRAGGING;
}
if (selstate != ABOUT_TO && selstate != DRAGGING)
selanchor = selpoint;
selstate = DRAGGING;
if (selpoint < selanchor) {
selstart = selpoint;
selend = selanchor + 1;
} else {
selstart = selanchor;
selend = selpoint + 1;
}
sel_spread();
} else if ((b == MB_SELECT || b == MB_EXTEND) && a == MA_RELEASE) {
if (selstate == DRAGGING) {
/*
* We've completed a selection. We now transfer the
* data to the clipboard.
*/
unsigned char *p = selspace;
unsigned long *q = selstart;
while (q < selend) {
int nl = FALSE;
unsigned long *lineend = q - (q-text) % (cols+1) + cols;
unsigned long *nlpos = lineend;
if (!(*nlpos & ATTR_WRAPPED)) {
while ((nlpos[-1] & CHAR_MASK) == 0x20 && nlpos > q)
nlpos--;
if (nlpos < selend)
nl = TRUE;
}
while (q < nlpos && q < selend)
*p++ = (unsigned char) (*q++ & CHAR_MASK);
if (nl) {
int i;
for (i=0; i<sizeof(sel_nl); i++)
*p++ = sel_nl[i];
}
q = lineend + 1; /* start of next line */
}
write_clip (selspace, p - selspace);
selstate = SELECTED;
} else
selstate = NO_SELECTION;
} else if (b == MB_PASTE && (a==MA_CLICK || a==MA_2CLK || a==MA_3CLK)) {
char *data;
int len;
get_clip((void **) &data, &len);
if (data) {
char *p, *q;
p = q = data;
while (p < data+len) {
while (p < data+len &&
!(p <= data+len-sizeof(sel_nl) &&
!memcmp(p, sel_nl, sizeof(sel_nl))))
p++;
{
int i;
unsigned char c;
for(i=0;i<p-q;i++)
{
c=xlat_kbd2tty(q[i]);
ldisc->send(&c,1);
}
}
if (p <= data+len-sizeof(sel_nl) &&
!memcmp(p, sel_nl, sizeof(sel_nl))) {
ldisc->send ("\r", 1);
p += sizeof(sel_nl);
}
q = p;
}
}
get_clip(NULL, NULL);
}
term_update();
}
static void deselect (void) {
selstate = NO_SELECTION;
selstart = selend = scrtop;
}
void term_deselect (void) {
deselect();
term_update();
}
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