4.3BSD-Tahoe/usr/src/new/jove/screen.c
/***************************************************************************
* This program is Copyright (C) 1986, 1987, 1988 by Jonathan Payne. JOVE *
* is provided to you without charge, and with no warranty. You may give *
* away copies of JOVE, including sources, provided that this notice is *
* included in all the files. *
***************************************************************************/
#include "jove.h"
#include "io.h"
#include "ctype.h"
#include "termcap.h"
#ifdef IBMPC
/* here come the actual emulation routines */
#include <dos.h>
#include <conio.h>
#define BYTE unsigned char
#define WORD unsigned int
#ifdef MAC
# undef private
# define private
#endif
#ifdef LINT_ARGS
private BYTE near get_mode(void);
private WORD
near cur_page(void),
near get_cur(void);
private void
near ch_out(BYTE, BYTE),
near clr_eop(void),
near cur_advance(void),
near cur_down(void),
near cur_left(void),
near cur_right(void),
near cur_up(void),
near line_feed(void),
near normfun(char),
near scr_win(int, BYTE, BYTE, BYTE, BYTE),
near set_cur(WORD),
near set_mode(BYTE),
near wherexy(BYTE *, BYTE *);
#else
private BYTE near get_mode();
private WORD
near cur_page(),
near get_cur();
private void
near ch_out(),
near clr_eop(),
near cur_advance(),
near cur_down(),
near cur_left(),
near cur_right(),
near cur_up(),
near line_feed(),
near normfun(),
near scr_win(),
near set_cur(),
near set_mode(),
near wherexy();
#endif /* LINT_ARGS */
#ifdef MAC
# undef private
# define private static
#endif
#define VIDEO 0x10
#define intr(n, r) int86(n, r, r);
BYTE CHPL=80,
LPP=25,
CUR_PAGE=0,
C_ATTR = 0x07,
C_X=0,
C_Y=0;
int Fgcolor = 7,
Bgcolor = 0,
Mdcolor = 0;
void setcolor(fg, bg)
BYTE fg, bg;
{
C_ATTR = ((bg&0xf)<<4)|(fg&0xf);
}
private
WORD near cur_page()
{
union REGS vr;
vr.h.ah = 0x0f;
intr(VIDEO, &vr);
return(vr.h.bh);
}
private
void near set_cur(xy)
WORD xy;
{
union REGS vr;
vr.h.bh = CUR_PAGE;
vr.h.ah = 0x02;
vr.x.dx = xy;
intr(VIDEO, &vr);
}
private
WORD near get_cur()
{
union REGS vr;
vr.h.bh = CUR_PAGE;
vr.h.ah = 0x03;
intr(VIDEO, &vr);
return (vr.x.dx);
}
private
BYTE near get_mode()
{
union REGS vr;
vr.h.ah = 0x0f;
intr(VIDEO, &vr);
return(vr.h.al);
}
BYTE lpp()
{
int far *regen = (int far *) 0x44C;
int what;
BYTE chpl();
what = (*regen&0xff00)/2/chpl();
return (what > 43 ? 25 : what);
}
private
void near set_mode(n)
BYTE n;
{
union REGS vr;
vr.h.ah = 0x00;
vr.h.al = n;
intr(VIDEO, &vr);
}
#define gotoxy(x,y) set_cur((x)<<8|((y)&0xff))
#define cur_mov(x,y) set_cur((C_X=x)<<8|((C_Y=y)&0xff))
private
void near wherexy( x, y)
BYTE *x, *y;
{
register WORD xy;
xy = get_cur();
*x = xy>>8;
*y = xy&0xff;
}
#define wherex() C_X
#define wherey() C_Y
private
void near scr_win(no, ulr, ulc, lrr, lrc)
int no;
BYTE ulr, ulc, lrr, lrc;
{
union REGS vr;
if (no >= 0)
vr.h.ah = 0x06;
else {
vr.h.ah = 0x07;
no = - no;
}
vr.h.al = no;
vr.x.cx = ulr<<8 | ulc;
vr.x.dx = lrr<<8 | lrc;
vr.h.bh = C_ATTR;
intr(VIDEO, &vr);
}
BYTE chpl()
{
union REGS vr;
vr.h.ah = 0x0f;
intr(VIDEO, &vr);
return(vr.h.ah);
}
#define clr_page() scr_win(0, 0, 0, LPP-1, CHPL-1), \
gotoxy(C_X = 0, C_Y = 0)
private
void near cur_right()
{
if (C_Y < CHPL-1)
C_Y++;
gotoxy(C_X, C_Y);
}
private
void near cur_up()
{
if (C_X)
C_X--;
gotoxy(C_X, C_Y);
}
private
void near cur_left()
{
if (C_Y)
C_Y--;
gotoxy(C_X, C_Y);
}
private
void near cur_down()
{
if (C_X < LPP-1)
C_X++;
gotoxy(C_X, C_Y);
}
private
void near ch_out(c, n)
BYTE c, n;
{
union REGS vr;
vr.h.ah = 0x09;
vr.h.al = c;
vr.h.bl = C_ATTR;
vr.h.bh = CUR_PAGE;
vr.x.cx = n;
intr(VIDEO, &vr);
}
#define wrch(c) ch_out((c), 1), cur_advance()
#define home_cur() gotoxy(C_X = 0, C_Y = 0)
#define clr_eoln() ch_out(' ', CHPL-wherey())
private
void near clr_eop()
{
clr_eoln();
scr_win(LPP-1-wherex(), wherex()+1, 0, LPP-1, CHPL-1);
}
void init_43()
{
BYTE far *info = (BYTE far *) 0x487;
WORD far *CRTC = (WORD far *) 0x463;
union REGS vr;
WORD cur;
CUR_PAGE = cur_page();
CHPL = chpl();
LPP = lpp();
if (get_mode()!=3)
set_mode(3);
cur = get_cur();
vr.x.ax = 0x1112;
vr.h.bl = 0;
intr(VIDEO, &vr);
*info |= 1;
vr.x.ax = 0x0100;
vr.h.bh = 0;
vr.x.cx = 0x0600;
intr(VIDEO, &vr);
outp(*CRTC, 0x14);
outp(*CRTC+1, 0x07);
vr.x.ax = 0x1200;
vr.h.bl = 0x20;
intr(VIDEO, &vr);
LPP = lpp();
set_cur(cur);
wherexy(&C_X, &C_Y);
}
void reset_43()
{
BYTE far *info = (BYTE far *) 0x487;
WORD far *CRTC = (WORD far *) 0x463;
union REGS vr;
set_mode(3);
*info &= 128;
vr.x.ax = 0x0100;
vr.h.bh = 0x0607;
vr.x.cx = 0x0607;
intr(VIDEO, &vr);
outp(*CRTC, 0x14);
outp(*CRTC+1, 13);
}
#define scr_up() scr_win(1, 0, 0, LPP-1, CHPL-1)
#define back_space() cur_left()
private
void near line_feed()
{
if (++C_X > LPP-1) {
C_X = LPP-1;
scr_up();
}
gotoxy(C_X, C_Y);
}
#define BELL_P 0x61 /* speaker */
#define BELL_D 0x2dc /* 550 hz */
#define TIME_P 0x40 /* timer */
#define TINI 182 /* 10110110b timer initialization */
void dobell(x)
{
unsigned int n = 0x8888;
int orgval;
outp(TIME_P+3, TINI);
outp(TIME_P+2, BELL_D&0xff);
outp(TIME_P+2, BELL_D>>8);
orgval = inp(BELL_P);
outp(BELL_P, orgval|3); /* turn speaker on */
while (--n > 0)
;
outp(BELL_P, orgval);
}
#define carriage_return() gotoxy(wherex(), C_Y = 0)
private
void near cur_advance()
{
if (++C_Y > CHPL-1) {
C_Y = 0;
if (++C_X > LPP-1) {
scr_up();
C_X = LPP-1;
}
}
gotoxy(C_X, C_Y);
}
void init_term()
{
if (lpp() == 43)
reset_43();
CUR_PAGE = cur_page();
CHPL = chpl();
LPP = lpp();
wherexy(&C_X, &C_Y);
}
private
void near normfun();
void write_em(s)
char *s;
{
while (*s)
normfun(*s++);
}
void write_emif(s)
char *s;
{
if (s)
write_em(s);
}
void write_emc(s, n)
char *s;
int n;
{
while (n--)
normfun(*s++);
}
private
void near normfun(c)
char c;
{
switch (c) {
case 10: line_feed(); break;
case 13: carriage_return(); break;
case 8: back_space(); break;
case 7: dobell(0); break;
case 0: break;
default: wrch(c);
}
}
#endif /* IBMPC */
extern int BufSize;
int AbortCnt,
tabstop = 8;
#if !(defined(IBMPC) || defined(MAC))
int (*TTins_line)(),
(*TTdel_line)();
#endif /* (defined(IBMPC) || defined(MAC)) */
struct scrimage
*DesiredScreen = 0,
*PhysScreen = 0;
struct screenline *Screen = 0, /* the screen (a bunch of screenline) */
*Savelines = 0, /* another bunch (LI of them) */
*Curline = 0; /* current line */
char *cursor, /* offset into current Line */
*cursend;
int CapCol,
CapLine,
i_line,
i_col;
void
make_scr()
{
register int i;
register struct screenline *ns;
register char *nsp;
#ifdef RESHAPING
/* In case we are RESHAPING the window! */
if (DesiredScreen)
free((char *) DesiredScreen);
if (PhysScreen)
free((char *) PhysScreen);
if (Savelines)
free((char *) Savelines);
if (Screen) {
free(Screen->s_line); /* free all the screen data */
free((char *) Screen);
}
#endif /* RESHAPING */
DesiredScreen = (struct scrimage *) malloc((unsigned) LI * sizeof (struct scrimage));
PhysScreen = (struct scrimage *) malloc((unsigned) LI * sizeof (struct scrimage));
Savelines = (struct screenline *)
malloc((unsigned) LI * sizeof(struct screenline));
ns = Screen = (struct screenline *)
malloc((unsigned) LI * sizeof(struct screenline));
nsp = (char *) malloc((unsigned)CO * LI);
if (nsp == 0) {
printf("\n\rCannot malloc screen!\n");
finish(1);
}
for (i = 0; i < LI; i++) {
ns->s_line = nsp;
nsp += CO;
ns->s_length = nsp - 1; /* End of Line */
ns += 1;
}
cl_scr(0);
}
void
clrline(cp1, cp2)
register char *cp1,
*cp2;
{
while (cp1 <= cp2)
*cp1++ = ' ';
}
#if !(defined(IBMPC) || defined(MAC))
# define sputc(c) ((*cursor != (char) (c)) ? dosputc(c) : (cursor++, i_col++))
#endif /* (defined(IBMPC) || defined(MAC)) */
#ifdef IBMPC
int force = 0;
# define sputc(c) dosputc(c)
#endif /* IBMPC */
#ifdef MAC
# define sputc(c) bufputc(c) /* line buffered for mac display */
#endif /* MAC */
#define soutputc(c) if (--n <= 0) break; else sputc(c)
void
cl_eol()
{
if (cursor > cursend)
return;
if (cursor < Curline->s_length) {
#if !(defined(IBMPC) || defined(MAC))
if (CE) {
#endif /* (defined(IBMPC) || defined(MAC)) */
Placur(i_line, i_col);
#ifdef TERMCAP
putpad(CE, 1);
#else
clr_eoln();
#endif /* TERMCAP */
clrline(cursor, Curline->s_length);
#if !(defined(IBMPC) || defined(MAC))
} else {
/* Ugh. The slow way for dumb terminals. */
register char *savecp = cursor;
while (cursor <= Curline->s_length)
sputc(' ');
cursor = savecp;
}
#endif /* (defined(IBMPC) || defined(MAC)) */
Curline->s_length = cursor;
}
}
void
cl_scr(doit)
{
register int i;
register struct screenline *sp = Screen;
for (i = 0; i < LI; i++, sp++) {
clrline(sp->s_line, sp->s_length);
sp->s_length = sp->s_line;
PhysScreen[i].s_id = 0;
}
if (doit) {
#ifdef TERMCAP
putpad(CL, LI);
#else
clr_page();
#endif /* TERMCAP */
CapCol = CapLine = 0;
UpdMesg = YES;
}
}
#ifdef ID_CHAR
extern int IN_INSmode;
#endif
/* Output one character (if necessary) at the current position */
#ifndef MAC
int /* only for lints sake */
dosputc(c)
register char c;
{
#ifndef IBMPC
if (*cursor != c) {
# ifdef ID_CHAR
if (IN_INSmode)
INSmode(0);
# endif
#else /* IBMPC */
if ((force) || (*cursor != c)) {
#endif /* IBMPC */
if (i_line != CapLine || i_col != CapCol)
Placur(i_line, i_col);
#ifndef IBMPC
if (UL && (c & CHARMASK) == '_' && (*cursor & CHARMASK) != ' ')
putstr(" \b"); /* Erase so '_' looks right. */
#endif /* IBMPC */
*cursor++ = c;
#ifndef IBMPC
putchar(c & CHARMASK);
#else /* IBMPC */
normfun(c);
#endif /* IBMPC */
AbortCnt -= 1;
CapCol += 1;
i_col += 1;
} else {
cursor += 1;
i_col += 1;
}
}
#else /* MAC */
/* Character output to bit-mapped screen is very expensive. It makes
much more sense to write the entire line at once. So, we print all
the characters, whether already there or not, once the line is
complete. */
#define BUFFLUSH (char) 0
#define BUFSTART (char) 1
bufputc(c)
register char c;
{
static char buf[256];
static int len = 0;
if(c == BUFSTART) {
/* if (i_line != CapLine || i_col != CapCol)*/
NPlacur(i_line, i_col);
len = 0;
return;
}
if(c == BUFFLUSH) {
buf[0] = (unsigned char) len;
writechr(buf);
len = 0;
}
else {
if(len > 255) return;
*cursor++ = c;
if(c == '0') buf[++len] = 0xAF; /* slashed zero */
else buf[++len] = c;
CapCol++;
i_col++;
}
return;
}
#endif /* MAC */
/* Write `line' at the current position of `cursor'. Stop when we
reach the end of the screen. Aborts if there is a character
waiting. */
#ifdef MAC /* This was getting too complicated with ifdefs ... */
int
swrite(line, inversep, abortable)
register char *line;
register int abortable;
{
register int c;
int col = i_col,
aborted = 0;
register int n = cursend - cursor;
if (n <= 0)
return 1;
sputc(BUFSTART); /* Okay, because no interruption possible */
while (c = *line++) {
if (c == '\t') {
int nchars;
nchars = (tabstop - (col % tabstop));
col += nchars;
while (nchars--)
soutputc(' ');
if (n <= 0)
break;
} else if (isctrl(c)) {
soutputc('^');
c = ((c == '\177') ? '?' : c + '@');
soutputc(c);
col += 2;
} else {
soutputc(c);
col += 1;
}
}
if (n <= 0) {
if ((*line == '\0') && (c != '\t') && !isctrl(c))
sputc(c);
sputc('!');
}
if (cursor > Curline->s_length)
Curline->s_length = cursor;
sputc(BUFFLUSH);
return !aborted;
}
#else /* MAC */
int
swrite(line, inversep, abortable)
register char *line;
register int abortable;
{
register int c;
int col = i_col,
aborted = 0;
register int n = cursend - cursor;
#ifndef IBMPC
int or_byte = inversep ? 0200 : 0,
thebyte;
#else
int thebyte;
#endif /* IBMPC */
#ifdef IBMPC
force = inversep? 1: 0; /* to force a redraw of the modeline */
#endif /* IBMPC */
if (n <= 0)
return 1;
while (c = *line++) {
#if !(defined(IBMPC) || defined(MAC)) /* don't check after every character */
if (abortable && AbortCnt < 0) {
AbortCnt = BufSize;
if (InputPending = charp()) {
aborted = 1;
break;
}
}
#endif /* (defined(IBMPC) || defined(MAC)) */
if (c == '\t') {
int nchars;
nchars = (tabstop - (col % tabstop));
col += nchars;
#ifndef IBMPC
thebyte = (' ' | or_byte);
#endif /* IBMPC */
while (nchars--)
#ifndef IBMPC
soutputc(thebyte);
#else /* IBMPC */
soutputc(' ');
#endif /* IBMPC */
if (n <= 0)
break;
} else if (isctrl(c)) {
#ifndef IBMPC
thebyte = ('^' | or_byte);
soutputc(thebyte);
thebyte = (((c == '\177') ? '?' : c + '@') | or_byte);
soutputc(thebyte);
#else /* IBMPC */
soutputc('^');
c = ((c == '\177') ? '?' : c + '@');
soutputc(c);
#endif /* IBMPC */
col += 2;
} else {
#ifndef IBMPC
thebyte = (c | or_byte);
soutputc(thebyte);
#else /* IBMPC */
if (c == 255) c = 1;
if (c == ' ' && inversep) c = 255;
soutputc(c);
#endif /* IBMPC */
col += 1;
}
}
if (n <= 0) {
if ((*line == '\0') && (c != '\t') && !isctrl(c))
#ifndef IBMPC
sputc(c|or_byte);
#else /* IBMPC */
sputc(c);
#endif /* IBMPC */
else
#ifndef IBMPC
sputc('!'|or_byte);
#else /* IBMPC */
sputc('!');
#endif /* IBMPC */
}
if (cursor > Curline->s_length)
Curline->s_length = cursor;
#ifdef IBMPC
force = 0;
#endif
return !aborted;
}
#endif /* MAC */
/* This is for writing a buffer line to the screen. This is to
minimize the amount of copying from one buffer to another buffer.
This gets the info directly from the disk buffers. */
int
BufSwrite(linenum)
{
register int n = cursend - cursor,
col = 0,
c = -1;
register char *bp;
int StartCol = DesiredScreen[linenum].s_offset,
visspace = DesiredScreen[linenum].s_window->w_flags & W_VISSPACE,
aborted = 0;
bp = lcontents(DesiredScreen[linenum].s_lp);
if (*bp) for (;;) {
if (col >= StartCol) {
DesiredScreen[linenum].s_offset = col;
break;
}
c = *bp++ & CHARMASK;
if (c == '\0')
break;
if (c == '\t')
col += (tabstop - (col % tabstop));
else if (isctrl(c))
col += 2;
else
col += 1;
}
#ifdef MAC
sputc(BUFSTART); /* Okay because we can't be interrupted */
#endif
if (c != '\0') while (c = *bp++) {
#if !(defined(IBMPC) || defined(MAC)) /* will never get true so why bother */
if (AbortCnt < 0) {
AbortCnt = BufSize;
if (InputPending = charp()) {
aborted = 1;
break;
}
}
#endif /* (defined(IBMPC) || defined(MAC)) */
if (c == '\t') {
int nchars = (tabstop - (col % tabstop));
col += nchars;
if (visspace) {
soutputc('>');
nchars -= 1;
}
while (--nchars >= 0)
soutputc(' ');
if (n <= 0)
break;
} else if (isctrl(c)) {
soutputc('^');
soutputc((c == '\177') ? '?' : c + '@');
col += 2;
} else {
if (c == ' ' && visspace)
c = '_';
#ifdef IBMPC
if (c == 255)
c = 1;
#endif /* IBMPC */
soutputc(c);
col += 1;
}
}
if (n <= 0) {
if ((*bp == '\0') && (c != '\t') && !isctrl(c))
sputc(c);
else
sputc('!');
}
if (cursor > Curline->s_length)
Curline->s_length = cursor;
#ifdef MAC
sputc(BUFFLUSH);
#endif
return !aborted; /* Didn't abort */
}
void
i_set(nline, ncol)
register int nline,
ncol;
{
Curline = &Screen[nline];
cursor = Curline->s_line + ncol;
cursend = &Curline->s_line[CO - 1];
i_line = nline;
i_col = ncol;
}
/* Insert `num' lines a top, but leave all the lines BELOW `bottom'
alone (at least they won't look any different when we are done).
This changes the screen array AND does the physical changes. */
void
v_ins_line(num, top, bottom)
{
register int i;
/* Save the screen pointers. */
for(i = 0; i < num && top + i <= bottom; i++)
Savelines[i] = Screen[bottom - i];
/* Num number of bottom lines will be lost.
Copy everything down num number of times. */
for (i = bottom; i > top && i-num >= 0; i--)
Screen[i] = Screen[i - num];
/* Restore the saved ones, making them blank. */
for (i = 0; i < num; i++) {
Screen[top + i] = Savelines[i];
clrline(Screen[top + i].s_line, Screen[top + i].s_length);
Screen[top + i].s_length = Screen[top + i].s_line;
}
#if !(defined(IBMPC) || defined(MAC))
(*TTins_line)(top, bottom, num);
#endif
#ifdef MAC
i_lines(top, bottom, num);
#endif
#ifdef IBMPC
scr_win(-num, top, 0, bottom, CHPL-1);
#endif
}
/* Delete `num' lines starting at `top' leaving the lines below `bottom'
alone. This updates the internal image as well as the physical image. */
void
v_del_line(num, top, bottom)
{
register int i,
bot;
bot = bottom;
/* Save the lost lines. */
for (i = 0; i < num && top + i <= bottom; i++)
Savelines[i] = Screen[top + i];
/* Copy everything up num number of lines. */
for (i = top; num + i <= bottom; i++)
Screen[i] = Screen[i + num];
/* Restore the lost ones, clearing them. */
for (i = 0; i < num; i++) {
Screen[bottom - i] = Savelines[i];
clrline(Screen[bot].s_line, Screen[bot].s_length);
Screen[bot].s_length = Screen[bot].s_line;
bot -= 1;
}
#if !(defined(IBMPC) || defined(MAC))
(*TTdel_line)(top, bottom, num);
#endif
#ifdef MAC
d_lines(top, bottom, num);
#endif
#ifdef IBMPC
scr_win(num, top, 0, bottom, CHPL-1);
#endif
}
#ifndef MAC /* remainder of this file */
#ifdef IBMPC
/* No cursor optimization on an IBMPC, this simplifies things a lot.
Think about it: it would be silly!
*/
int phystab = 8;
void
Placur(line, col)
{
cur_mov(line, col);
CapCol = col;
CapLine = line;
}
void
SO_on()
{
if (Mdcolor)
setcolor(Mdcolor&0xf, Mdcolor>>4);
else
setcolor(Bgcolor, Fgcolor);
}
void
SO_off()
{
setcolor(Fgcolor, Bgcolor);
}
extern int EGA;
void
UnsetTerm(foo)
char *foo;
{
Placur(ILI, 0);
clr_eoln();
if (EGA)
reset_43();
}
void
ResetTerm()
{
if (EGA)
init_43();
else
init_term();
do_sgtty(); /* this is so if you change baudrate or stuff
like that, JOVE will notice. */
ttyset(ON);
}
#else /* IBMPC */
/* The cursor optimization happens here. You may decide that this
is going too far with cursor optimization, or perhaps it should
limit the amount of checking to when the output speed is slow.
What ever turns you on ... */
private struct cursaddr {
int cm_numchars,
(*cm_proc)();
};
private char *Cmstr;
private struct cursaddr *HorMin,
*VertMin,
*DirectMin;
private void
GENi_lines(),
GENd_lines(),
ForMotion(),
ForTab(),
BackMotion(),
RetTab(),
DownMotion(),
UpMotion(),
GoDirect(),
HomeGo(),
BottomUp();
private struct cursaddr WarpHor[] = {
0, ForMotion,
0, ForTab,
0, BackMotion,
0, RetTab
};
private struct cursaddr WarpVert[] = {
0, DownMotion,
0, UpMotion
};
private struct cursaddr WarpDirect[] = {
0, GoDirect,
0, HomeGo,
0, BottomUp
};
#undef FORWARD
#define FORWARD 0 /* Move forward */
#define FORTAB 1 /* Forward using tabs */
#undef BACKWARD
#define BACKWARD 2 /* Move backward */
#define RETFORWARD 3 /* Beginning of line and then tabs */
#define NUMHOR 4
#define DOWN 0 /* Move down */
#define UPMOVE 1 /* Move up */
#define NUMVERT 2
#define DIRECT 0 /* Using CM */
#define HOME 1 /* HOME */
#define LOWER 2 /* Lower Line */
#define NUMDIRECT 3
#define home() Placur(0, 0)
#define LowLine() putpad(LL, 1), CapLine = ILI, CapCol = 0
#define PrintHo() putpad(HO, 1), CapLine = CapCol = 0
int phystab = 8;
private void
GoDirect(line, col)
register int line,
col;
{
putpad(Cmstr, 1);
CapLine = line;
CapCol = col;
}
private void
RetTab(col)
register int col;
{
putchar('\r');
CapCol = 0;
ForTab(col);
}
private void
HomeGo(line, col)
{
PrintHo();
DownMotion(line);
ForTab(col);
}
private void
BottomUp(line, col)
register int line,
col;
{
LowLine();
UpMotion(line);
ForTab(col);
}
/* Tries to move forward using tabs (if possible). It tabs to the
closest tabstop which means it may go past 'destcol' and backspace
to it. */
private void
ForTab(destcol)
int destcol;
{
register int tabgoal,
ntabs,
tabstp = phystab;
if (TABS && (tabstp > 0)) {
tabgoal = destcol + (tabstp / 2);
tabgoal -= (tabgoal % tabstp);
/* Don't tab to last place or else it is likely to screw up. */
if (tabgoal >= CO)
tabgoal -= tabstp;
ntabs = (tabgoal / tabstp) - (CapCol / tabstp);
while (--ntabs >= 0)
putchar('\t');
CapCol = tabgoal;
}
if (CapCol > destcol)
BackMotion(destcol);
else if (CapCol < destcol)
ForMotion(destcol);
}
private void
ForMotion(destcol)
register int destcol;
{
register int nchars = destcol - CapCol;
register char *cp = &Screen[CapLine].s_line[CapCol];
while (--nchars >= 0)
putchar(*cp++ & CHARMASK);
CapCol = destcol;
}
private void
BackMotion(destcol)
register int destcol;
{
register int nchars = CapCol - destcol;
if (BC)
while (--nchars >= 0)
putpad(BC, 1);
else
while (--nchars >= 0)
putchar('\b');
CapCol = destcol;
}
private void
DownMotion(destline)
register int destline;
{
register int nlines = destline - CapLine;
while (--nlines >= 0)
putpad(NL, 1);
CapLine = destline;
}
private void
UpMotion(destline)
register int destline;
{
register int nchars = CapLine - destline;
while (--nchars >= 0)
putpad(UP, 1);
CapLine = destline;
}
#ifdef ID_CHAR
static int EIlen;
#endif
extern int IMlen;
void
InitCM()
{
HOlen = HO ? strlen(HO) : 1000;
LLlen = LL ? strlen(LL) : 1000;
UPlen = UP ? strlen(UP) : 1000;
#ifdef ID_CHAR
if (EI)
EIlen = strlen(EI);
#endif
}
void
Placur(line, col)
{
int dline, /* Number of lines to move */
dcol; /* Number of columns to move */
register int best,
i;
register struct cursaddr *cp;
int xtracost = 0; /* Misc addition to cost. */
#define CursMin(which,addrs,max) \
for (best = 0, cp = &addrs[1], i = 1; i < max; i++, cp++) \
if (cp->cm_numchars < addrs[best].cm_numchars) \
best = i; \
which = &addrs[best];
if (line == CapLine && col == CapCol)
return; /* We are already there. */
dline = line - CapLine;
dcol = col - CapCol;
#ifdef ID_CHAR
if (IN_INSmode && MI)
xtracost = EIlen + IMlen;
/* If we're already in insert mode, it is likely that we will
want to be in insert mode again, after the insert. */
#endif
/* Number of characters to move horizontally for each case.
1: Just move forward by typing the right character on the screen.
2: Print the correct number of back spaces.
3: Try tabbing to the correct place.
4: Try going to the beginning of the line, and then tab. */
if (dcol == 1 || dcol == 0) { /* Most common case. */
HorMin = &WarpHor[FORWARD];
HorMin->cm_numchars = dcol + xtracost;
} else {
WarpHor[FORWARD].cm_numchars = dcol >= 0 ? dcol + xtracost : 1000;
WarpHor[BACKWARD].cm_numchars = dcol < 0 ? -(dcol + xtracost) : 1000;
WarpHor[FORTAB].cm_numchars = dcol >= 0 && TABS ?
ForNum(CapCol, col) + xtracost : 1000;
WarpHor[RETFORWARD].cm_numchars = (xtracost + 1 + (TABS ? ForNum(0, col) : col));
/* Which is the shortest of the bunch */
CursMin(HorMin, WarpHor, NUMHOR);
}
/* Moving vertically is more simple. */
WarpVert[DOWN].cm_numchars = dline >= 0 ? dline : 1000;
WarpVert[UPMOVE].cm_numchars = dline < 0 ? ((-dline) * UPlen) : 1000;
/* Which of these is simpler */
CursMin(VertMin, WarpVert, NUMVERT);
/* Homing first and lowering first are considered
direct motions.
Homing first's total is the sum of the cost of homing
and the sum of tabbing (if possible) to the right. */
if (VertMin->cm_numchars + HorMin->cm_numchars <= 3) {
DirectMin = &WarpDirect[DIRECT]; /* A dummy ... */
DirectMin->cm_numchars = 100;
} else {
WarpDirect[DIRECT].cm_numchars = CM ?
strlen(Cmstr = tgoto(CM, col, line)) : 1000;
WarpDirect[HOME].cm_numchars = HOlen + line +
WarpHor[RETFORWARD].cm_numchars;
WarpDirect[LOWER].cm_numchars = LLlen + ((ILI - line) * UPlen) +
WarpHor[RETFORWARD].cm_numchars;
CursMin(DirectMin, WarpDirect, NUMDIRECT);
}
if (HorMin->cm_numchars + VertMin->cm_numchars < DirectMin->cm_numchars) {
if (line != CapLine)
(*VertMin->cm_proc)(line);
if (col != CapCol) {
#ifdef ID_CHAR
if (IN_INSmode) /* We may use real characters ... */
INSmode(0);
#endif
(*HorMin->cm_proc)(col);
}
} else {
#ifdef ID_CHAR
if (IN_INSmode && !MI)
INSmode(0);
#endif
(*DirectMin->cm_proc)(line, col);
}
}
#define abs(x) ((x) >= 0 ? (x) : -(x))
int
ForNum(from, to)
register int from;
{
register int tabgoal,
tabstp = phystab;
int numchars = 0;
if (from >= to)
return from - to;
if (TABS && (tabstp > 0)) {
tabgoal = to + (tabstp / 2);
tabgoal -= (tabgoal % tabstp);
if (tabgoal >= CO)
tabgoal -= tabstp;
numchars = (tabgoal / tabstop) - (from / tabstp);
from = tabgoal;
}
return numchars + abs(from - to);
}
#ifdef WIRED_TERMS
void
BGi_lines(top, bottom, num)
{
printf("\033[%d;%dr\033[%dL\033[r", top + 1, bottom + 1, num);
CapCol = CapLine = 0;
}
void
SUNi_lines(top, bottom, num)
{
Placur(bottom - num + 1, 0);
printf("\033[%dM", num);
Placur(top, 0);
printf("\033[%dL", num);
}
void
C100i_lines(top, bottom, num)
{
if (num <= 1) {
GENi_lines(top, bottom, num);
return;
}
printf("\033v%c%c%c%c", ' ', ' ', ' ' + bottom + 1, ' ' + CO);
CapLine = CapCol = 0;
Placur(top, 0);
while (num--)
putpad(AL, ILI - CapLine);
printf("\033v%c%c%c%c", ' ', ' ', ' ' + LI, ' ' + CO);
CapLine = CapCol = 0;
}
#endif /* WIRED_TERMS */
private void
GENi_lines(top, bottom, num)
{
register int i;
if (CS) {
putpad(tgoto(CS, bottom, top), 1);
CapCol = CapLine = 0;
Placur(top, 0);
for (i = 0; i < num; i++)
putpad(SR, bottom - top);
putpad(tgoto(CS, ILI, 0), 1);
CapCol = CapLine = 0;
} else {
Placur(bottom - num + 1, 0);
if (M_DL && (num > 1)) {
char minibuf[16];
sprintf(minibuf, M_DL, num);
putpad(minibuf, ILI - CapLine);
} else {
for (i = 0; i < num; i++)
putpad(DL, ILI - CapLine);
}
Placur(top, 0);
if (M_AL && (num > 1)) {
char minibuf[16];
sprintf(minibuf, M_AL, num);
putpad(minibuf, ILI - CapLine);
} else {
for (i = 0; i < num; i++)
putpad(AL, ILI - CapLine);
}
}
}
#ifdef WIRED_TERMS
void
BGd_lines(top, bottom, num)
{
printf("\033[%d;%dr\033[%dM\033[r", top + 1, bottom + 1, num);
CapCol = CapLine = 0;
}
void
SUNd_lines(top, bottom, num)
{
Placur(top, 0);
printf("\033[%dM", num);
Placur(bottom + 1 - num, 0);
printf("\033[%dL", num);
}
void
C100d_lines(top, bottom, num)
{
if (num <= 1) {
GENd_lines(top, bottom, num);
return;
}
printf("\033v%c%c%c%c", ' ', ' ', ' ' + bottom + 1, ' ' + CO);
CapLine = CapCol = 0;
Placur(top, 0);
while (num--)
putpad(DL, ILI - CapLine);
printf("\033v%c%c%c%c", ' ', ' ', ' ' + LI, ' ' + CO);
CapLine = CapCol = 0;
}
#endif /* WIRED_TERMS */
private void
GENd_lines(top, bottom, num)
{
register int i;
if (CS) {
putpad(tgoto(CS, bottom, top), 1);
CapCol = CapLine = 0;
Placur(bottom, 0);
for (i = 0; i < num; i++)
putpad(SF, bottom - top);
putpad(tgoto(CS, ILI, 0), 1);
CapCol = CapLine = 0;
} else {
Placur(top, 0);
if (M_DL && (num > 1)) {
char minibuf[16];
sprintf(minibuf, M_DL, num);
putpad(minibuf, ILI - top);
} else {
for (i = 0; i < num; i++)
putpad(DL, ILI - top);
}
Placur(bottom + 1 - num, 0);
if (M_AL && (num > 1)) {
char minibuf[16];
sprintf(minibuf, M_AL, num);
putpad(minibuf, ILI - CapLine);
} else {
for (i = 0; i < num; i++)
putpad(AL, ILI - CapLine);
}
}
}
struct ID_lookup {
char *ID_name;
int (*I_proc)(); /* proc to insert lines */
int (*D_proc)(); /* proc to delete lines */
} ID_trms[] = {
"generic", GENi_lines, GENd_lines, /* This should stay here */
#ifdef WIRED_TERMS
"sun", SUNi_lines, SUNd_lines,
"bg", BGi_lines, BGd_lines,
"c1", C100i_lines, C100d_lines,
#endif /* WIRED_TERMS */
0, 0, 0
};
void
IDline_setup(tname)
char *tname;
{
register struct ID_lookup *idp;
for (idp = &ID_trms[1]; idp->ID_name; idp++)
if (strncmp(idp->ID_name, tname, strlen(idp->ID_name)) == 0)
break;
if (idp->ID_name == 0)
idp = &ID_trms[0];
TTins_line = idp->I_proc;
TTdel_line = idp->D_proc;
}
#endif /* IBMPC */
#endif /* MAC */