screen.c

早期freebsd实现

/***************************************************************************
 * 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 "fp.h"
#include "ctype.h"
#include "termcap.h"
#include "disp.h"
#include <signal.h>

#ifdef MSDOS
#define SIGHUP 99
#endif

int	AbortCnt,
	tabstop = 8;
bool
	CanScroll = NO;

#ifdef	TERMCAP
private void
	(*TTins_line) proto((int, int, int)),
	(*TTdel_line) proto((int, int, int));
#endif	/* TERMCAP */

struct scrimage
	*DesiredScreen = NULL,
	*PhysScreen = NULL;

struct screenline	*Screen = NULL,	/* the screen (a bunch of screenline) */
			*Curline = NULL;	/* current line */

private struct screenline   *Savelines = NULL;	/* another bunch (LI of them) */


private char	*cursor;			/* offset into current Line */

char	*cursend;

int	CapCol,
	CapLine,

	i_line,
	i_col;

#ifdef	IBMPC
extern unsigned char	CHPL;
extern void		near normfun(),
			near scr_win(),
			near clr_page(),
			near clr_eoln();

#endif

void
make_scr()
{
	register int	i;
	register struct screenline	*ns;
	register char	*nsp;

	/* In case we are RESHAPING the window! */
	if (DesiredScreen != NULL)
		free((UnivPtr) DesiredScreen);
	if (PhysScreen != NULL)
		free((UnivPtr) PhysScreen);
	if (Savelines != NULL)
		free((UnivPtr) Savelines);
	if (Screen != NULL) {
		free((UnivPtr) Screen->s_line);	/* free all the screen data */
		free((UnivPtr) Screen);
	}

	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 (DesiredScreen == NULL
	|| PhysScreen == NULL
	|| Savelines == NULL
	|| ns == NULL
	|| nsp == NULL)
	{
		writef("\n\rCannot malloc screen!\n");
		finish(SIGHUP);
	}

	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++ = ' ';
}


/* Output one character (if necessary) at the current position */

#ifdef	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.  */

private char sput_buf[256];
private int sput_len = 0;

private void
sput_start()
{
/*	if (i_line != CapLine || i_col != CapCol) */
		NPlacur(i_line, i_col);
	sput_len = 0;
}

private void
sput_end()
{
	sput_buf[0] = (unsigned char) sput_len;
	writechr(sput_buf);
	sput_len = 0;
}

private void
sputc(c)
register int c;
{
	if (sput_len < sizeof(sput_buf)) {
		*cursor++ = c;
		sput_buf[++sput_len] = (c == '0')? 0xAF /* slashed zero */ : c;
		CapCol++;
		i_col++;
	}
}

#else	/* !MAC */
#ifdef	IBMPC

private bool force = NO;

private void
sputc(c)
register int	c;
{
	if (force || (*cursor != c)) {
		if (i_line != CapLine || i_col != CapCol)
			Placur(i_line, i_col);
		*cursor++ = c;
		normfun((char) c);
		AbortCnt -= 1;
		CapCol += 1;
	} else {
		cursor += 1;
	}
	i_col += 1;
}

#else	/* !IBMPC */

#  define sputc(c)	{ \
	if (*cursor != (char) (c)) { \
		do_sputc(c); \
	} else { \
		cursor++; \
		i_col++; \
	} \
}

private void
do_sputc(c)
register int	c;
{
	if (*cursor != c) {
# ifdef	ID_CHAR
		if (IN_INSmode)
			INSmode(OFF);
# endif
		if (i_line != CapLine || i_col != CapCol)
			Placur(i_line, i_col);
		if (UL && (c & CHARMASK) == '_' && (*cursor & CHARMASK) != ' ')
			putstr(" \b");		/* Erase so '_' looks right. */
		*cursor++ = c;
		jputchar(c & CHARMASK);
		AbortCnt -= 1;
		CapCol += 1;
	} else {
		cursor += 1;
	}
	i_col += 1;
}

#endif	/* !IBMPC */
#endif	/* !MAC */

void
cl_eol()
{
	if (cursor > cursend)
		return;

	if (cursor < Curline->s_length) {
#ifdef	TERMCAP
		if (CE) {
			Placur(i_line, i_col);
			putpad(CE, 1);
			clrline(cursor, Curline->s_length);
		} else {
			/* Ugh.  The slow way for dumb terminals. */
			register char *savecp = cursor;

			while (cursor <= Curline->s_length)
				sputc(' ');
			cursor = savecp;
		}
#else	/* !TERMCAP */
		Placur(i_line, i_col);
		clr_eoln();
		clrline(cursor, Curline->s_length);
#endif	/* !TERMCAP */
		Curline->s_length = cursor;
	}
}

void
cl_scr(doit)
bool 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	/* !TERMCAP */
		clr_page();
#endif	/* !TERMCAP */
		CapCol = CapLine = 0;
		UpdMesg = YES;
	}
}

/* Write `line' at the current position of `cursor'.  Stop when we
   reach the end of the screen.  Aborts if there is a character
   waiting.  */


bool
swrite(line, inversep, abortable)
register char	*line;
bool	inversep;
bool	abortable;
{
	register int	n = cursend - cursor;
	bool	aborted = NO;

	if (n > 0) {

		register int	c;
		int	col = i_col;
#ifdef	MAC
#		define	spit(c)	sputc(c)
#else	/* !MAC */
#ifdef	IBMPC
#		define	spit(c)	sputc(c)
#else	/* !IBMPC */
		int	or_byte = inversep ? 0200 : 0;
#		define	spit(c)	{ int temp = (c) | or_byte; sputc(temp); }
#endif	/* !IBMPC */
#endif	/* !MAC */

#ifdef	MAC
		sput_start();	/* Okay, because no interruption possible */
#endif	/* MAC */
#ifdef	IBMPC
		force = inversep;  /* to force a redraw of the modeline */
#endif
		while ((c = *line++) != '\0') {
#			define  spot(c) { if (--n <= 0) break; spit(c); col += 1; }

			if (abortable && AbortCnt < 0) {
				AbortCnt = BufSize;
				if ((InputPending = charp()) != NO) {
					aborted = YES;
					break;
				}
			}
			if (c == '\t') {
				int	nchars;

				nchars = (tabstop - (col % tabstop));
				while (--nchars > 0)
					spot(' ');
				c = ' ';
			} else if (jiscntrl(c)) {
				spot('^');
				c = (c == '\177') ? '?' : c + '@';
#ifdef	TERMCAP
			} else if (Hazeltine && c == '~') {
				c = '`';
#endif
#ifdef	IBMPC
			} else if (c == 255) {
				c = 1;
			} else if (c == ' ' && inversep) {
				c = 255;
#endif	/* IBMPC */
			}
			spot(c);
#			undef	spot
		}
		if (n <= 0)
			spit(((*line=='\0') && (c!='\t') && !jiscntrl(c))? c : '!');
		if (cursor > Curline->s_length)
			Curline->s_length = cursor;
#ifdef	MAC
		sput_end();
#endif	/* MAC */
#ifdef	IBMPC
		force = NO;
#endif
#		undef	spit
	}
	return !aborted;
}

/* 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. */


bool
BufSwrite(linenum)
int 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;
	bool	aborted = NO;

	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 (jiscntrl(c))
				col += 2;
			else
				col += 1;
		}
	}
#ifdef	MAC
	sput_start();	/* Okay because we can't be interrupted */
#endif
	if (c != '\0') {
		while ((c = *bp++) != '\0') {
#			define spot(c)  { if (--n <= 0) break; sputc(c); col += 1; }

			if (AbortCnt < 0) {
				AbortCnt = BufSize;
				if ((InputPending = charp()) != NO) {
					aborted = YES;
					break;
				}
			}
			if (c == '\t') {
				int	nchars = (tabstop - (col % tabstop));

				if (visspace) {
					spot('>');
					nchars -= 1;
				}
				while (--nchars > 0)
					spot(' ');
				c = ' ';
			} else if (jiscntrl(c)) {
				spot('^');
				c = (c == '\177') ? '?' : c + '@';
			} else if (c == ' ' && visspace) {
				c = '_';
#ifdef	TERMCAP
			} else if (Hazeltine && c == '~') {
				c = '`';
#endif
#ifdef	IBMPC
			} else if (c == 255) {
				   c = 1;
#endif	/* IBMPC */
			}
			spot(c);
#			undef	spot
		}
	}
	if (n <= 0)
		sputc(((*bp == '\0') && (c != '\t') && !jiscntrl(c))? c : '!');
	if (cursor > Curline->s_length)
		Curline->s_length = cursor;
#ifdef	MAC
	sput_end();
#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;
}

#ifdef	TERMCAP
void
SO_on()
{
	/* If there are magic cookies, then WHERE the SO string is
	   printed decides where the SO actually starts on the screen.
	   So it's important to make sure the cursor is positioned there
	   anyway.  I think this is right. */
	if (SG != 0) {
		Placur(i_line, i_col);
		i_col += SG;
		CapCol += SG;
	}
	putpad(SO, 1);
}

void
SO_off()
{
	/* see comment in SO_on() */
	if (SG != 0) {
		Placur(i_line, i_col);
		i_col += SG;
		CapCol += SG;
	}
	putpad(SE, 1);
}
#endif	/* TERMCAP */

/* 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)
int 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;
	}

#ifdef	IBMPC
	scr_win((int) -num, (unsigned char) top, 0, (unsigned char) bottom, CHPL-1);
#else	/* !IBMPC */
# ifdef	MAC
	i_lines(top, bottom, num);
# else	/* !MAC */
	(*TTins_line)(top, bottom, num);
# endif	/* !MAC */
#endif	/* !IBMPC */
}

/* 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)
int 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];