/*	tcap.c
 *
 *	Unix V7 SysV and BS4 Termcap video driver
 *
 *	modified by Petri Kutvonen
 */

/*
 * Defining this to 1 breaks tcapopen() - it doesn't check if the
 * sceen size has changed.
 *	-lbt
 */
#define USE_BROKEN_OPTIMIZATION 0
#define	termdef	1 /* Don't define "term" external. */

#include <curses.h>
#include <stdio.h>
#include <term.h>

#include "estruct.h"
#include "edef.h"
#include "efunc.h"

#if TERMCAP

#if UNIX
#include <signal.h>
#endif

#define	MARGIN	8
#define	SCRSIZ	64
#define	NPAUSE	10    /* # times thru update to pause. */
#define BEL     0x07
#define ESC     0x1B

static void tcapkopen(void);
static void tcapkclose(void);
static void tcapmove(int, int);
static void tcapeeol(void);
static void tcapeeop(void);
static void tcapbeep(void);
static void tcaprev(int);
static int tcapcres(char *);
static void tcapscrollregion(int top, int bot);
static void putpad(char *str);

static void tcapopen(void);
#if PKCODE
static void tcapclose(void);
#endif

#if COLOR
static void tcapfcol(void);
static void tcapbcol(void);
#endif
#if SCROLLCODE
static void tcapscroll_reg(int from, int to, int linestoscroll);
static void tcapscroll_delins(int from, int to, int linestoscroll);
#endif

#define TCAPSLEN 315
static char tcapbuf[TCAPSLEN];
static char *UP, PC, *CM, *CE, *CL, *SO, *SE;

#if PKCODE
static char *TI, *TE;
#if USE_BROKEN_OPTIMIZATION
static int term_init_ok = 0;
#endif
#endif

#if SCROLLCODE
static char *CS, *DL, *AL, *SF, *SR;
#endif

struct terminal term = {
	0, /* These four values are set dynamically at open time. */
	0,
	0,
	0,
	MARGIN,
	SCRSIZ,
	NPAUSE,
	tcapopen,
#if	PKCODE
	tcapclose,
#else
	ttclose,
#endif
	tcapkopen,
	tcapkclose,
	ttgetc,
	ttputc,
	ttflush,
	tcapmove,
	tcapeeol,
	tcapeeop,
	tcapbeep,
	tcaprev,
	tcapcres
#if	COLOR
	    , tcapfcol,
	tcapbcol
#endif
#if     SCROLLCODE
	    , NULL		/* set dynamically at open time */
#endif
};

static void tcapopen(void)
{
	char *t, *p;
	char tcbuf[1024];
	char *tv_stype;
	char err_str[72];
	int int_col, int_row;

#if PKCODE && USE_BROKEN_OPTIMIZATION
	if (!term_init_ok) {
#endif
		if ((tv_stype = getenv("TERM")) == NULL) {
			puts("Environment variable TERM not defined!");
			exit(1);
		}

		if ((tgetent(tcbuf, tv_stype)) != 1) {
			sprintf(err_str, "Unknown terminal type %s!",
				tv_stype);
			puts(err_str);
			exit(1);
		}

		/* Get screen size from system, or else from termcap.  */
		getscreensize(&int_col, &int_row);
		term.t_nrow = int_row - 1;
		term.t_ncol = int_col;

		if ((term.t_nrow <= 0)
		    && (term.t_nrow = (short) tgetnum("li") - 1) == -1) {
			puts("termcap entry incomplete (lines)");
			exit(1);
		}

		if ((term.t_ncol <= 0)
		    && (term.t_ncol = (short) tgetnum("co")) == -1) {
			puts("Termcap entry incomplete (columns)");
			exit(1);
		}
#ifdef SIGWINCH
		term.t_mrow = MAXROW;
		term.t_mcol = MAXCOL;
#else
		term.t_mrow = term.t_nrow > MAXROW ? MAXROW : term.t_nrow;
		term.t_mcol = term.t_ncol > MAXCOL ? MAXCOL : term.t_ncol;
#endif
		p = tcapbuf;
		t = tgetstr("pc", &p);
		if (t)
			PC = *t;
		else
			PC = 0;

		CL = tgetstr("cl", &p);
		CM = tgetstr("cm", &p);
		CE = tgetstr("ce", &p);
		UP = tgetstr("up", &p);
		SE = tgetstr("se", &p);
		SO = tgetstr("so", &p);
		if (SO != NULL)
			revexist = TRUE;
#if	PKCODE
		if (tgetnum("sg") > 0) {	/* can reverse be used? P.K. */
			revexist = FALSE;
			SE = NULL;
			SO = NULL;
		}
		TI = tgetstr("ti", &p);	/* terminal init and exit */
		TE = tgetstr("te", &p);
#endif

		if (CL == NULL || CM == NULL || UP == NULL) {
			puts("Incomplete termcap entry\n");
			exit(1);
		}

		if (CE == NULL)	/* will we be able to use clear to EOL? */
			eolexist = FALSE;
#if SCROLLCODE
		CS = tgetstr("cs", &p);
		SF = tgetstr("sf", &p);
		SR = tgetstr("sr", &p);
		DL = tgetstr("dl", &p);
		AL = tgetstr("al", &p);

		if (CS && SR) {
			if (SF == NULL)	/* assume '\n' scrolls forward */
				SF = "\n";
			term.t_scroll = tcapscroll_reg;
		} else if (DL && AL) {
			term.t_scroll = tcapscroll_delins;
		} else {
			term.t_scroll = NULL;
		}
#endif

		if (p >= &tcapbuf[TCAPSLEN]) {
			puts("Terminal description too big!\n");
			exit(1);
		}
#if PKCODE && USE_BROKEN_OPTIMIZATION
		term_init_ok = 1;
	}
#endif
	ttopen();
}

#if	PKCODE
static void tcapclose(void)
{
	putpad(tgoto(CM, 0, term.t_nrow));
	putpad(TE);
	ttflush();
	ttclose();
}
#endif

static void tcapkopen(void)
{
#if	PKCODE
	putpad(TI);
	ttflush();
	ttrow = 999;
	ttcol = 999;
	sgarbf = TRUE;
#endif
	strcpy(sres, "NORMAL");
}

static void tcapkclose(void)
{
#if	PKCODE
	putpad(TE);
	ttflush();
#endif
}

static void tcapmove(int row, int col)
{
	putpad(tgoto(CM, col, row));
}

static void tcapeeol(void)
{
	putpad(CE);
}

static void tcapeeop(void)
{
	putpad(CL);
}

/*
 * Change reverse video status
 *
 * @state: FALSE = normal video, TRUE = reverse video.
 */
static void tcaprev(int state)
{
	if (state) {
		if (SO != NULL)
			putpad(SO);
	} else if (SE != NULL)
		putpad(SE);
}

/* Change screen resolution. */
static int tcapcres(char *res)
{
	return TRUE;
}

#if SCROLLCODE

/* move howmanylines lines starting at from to to */
static void tcapscroll_reg(int from, int to, int howmanylines)
{
	int i;
	if (to == from)
		return;
	if (to < from) {
		tcapscrollregion(to, from + howmanylines - 1);
		tcapmove(from + howmanylines - 1, 0);
		for (i = from - to; i > 0; i--)
			putpad(SF);
	} else {		/* from < to */
		tcapscrollregion(from, to + howmanylines - 1);
		tcapmove(from, 0);
		for (i = to - from; i > 0; i--)
			putpad(SR);
	}
	tcapscrollregion(0, term.t_nrow);
}

/* move howmanylines lines starting at from to to */
static void tcapscroll_delins(int from, int to, int howmanylines)
{
	int i;
	if (to == from)
		return;
	if (to < from) {
		tcapmove(to, 0);
		for (i = from - to; i > 0; i--)
			putpad(DL);
		tcapmove(to + howmanylines, 0);
		for (i = from - to; i > 0; i--)
			putpad(AL);
	} else {
		tcapmove(from + howmanylines, 0);
		for (i = to - from; i > 0; i--)
			putpad(DL);
		tcapmove(from, 0);
		for (i = to - from; i > 0; i--)
			putpad(AL);
	}
}

/* cs is set up just like cm, so we use tgoto... */
static void tcapscrollregion(int top, int bot)
{
	ttputc(PC);
	putpad(tgoto(CS, bot, top));
}

#endif

#if COLOR
/* No colors here, ignore this. */
static void tcapfcol(void)
{
}
/* No colors here, ignore this. */
static void tcapbcol(void)
{
}
#endif

static void tcapbeep(void)
{
	ttputc(BEL);
}

static void putpad(char *str)
{
	tputs(str, 1, ttputc);
}
#endif /* TERMCAP */