/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.topl.c - version 1.0.2 */
/* $FreeBSD: src/games/hack/hack.topl.c,v 1.3 1999/11/16 02:57:12 billf Exp $ */
/* $DragonFly: src/games/hack/hack.topl.c,v 1.3 2006/08/21 19:45:32 pavalos Exp $ */

#include "hack.h"
extern int CO;

char toplines[BUFSZ];
xchar tlx, tly;			/* set by pline; used by addtopl */

struct topl {
	struct topl *next_topl;
	char *topl_text;
} *old_toplines, *last_redone_topl;
#define	OTLMAX	20		/* max nr of old toplines remembered */

static void redotoplin(void);
static void xmore(const char *);

int
doredotopl(void)
{
	if (last_redone_topl)
		last_redone_topl = last_redone_topl->next_topl;
	if (!last_redone_topl)
		last_redone_topl = old_toplines;
	if (last_redone_topl)
		strcpy(toplines, last_redone_topl->topl_text);
	redotoplin();
	return (0);
}

static void
redotoplin(void)
{
	home();
	if (strchr(toplines, '\n'))
		cl_end();
	putstr(toplines);
	cl_end();
	tlx = curx;
	tly = cury;
	flags.toplin = 1;
	if (tly > 1)
		more();
}

void
remember_topl(void)
{
	struct topl *tl;
	int cnt = OTLMAX;

	if (last_redone_topl &&
	    !strcmp(toplines, last_redone_topl->topl_text))
		return;
	if (old_toplines &&
	    !strcmp(toplines, old_toplines->topl_text))
		return;
	last_redone_topl = 0;
	tl = alloc((unsigned)(strlen(toplines) + sizeof(struct topl) + 1));
	tl->next_topl = old_toplines;
	tl->topl_text = (char *)(tl + 1);
	strcpy(tl->topl_text, toplines);
	old_toplines = tl;
	while (cnt && tl) {
		cnt--;
		tl = tl->next_topl;
	}
	if (tl && tl->next_topl) {
		free(tl->next_topl);
		tl->next_topl = 0;
	}
}

void
addtopl(const char *s)
{
	curs(tlx, tly);
	if (tlx + (int)strlen(s) > CO)
		putsym('\n');
	putstr(s);
	tlx = curx;
	tly = cury;
	flags.toplin = 1;
}

static void
xmore(const char *s)	/* allowed chars besides space/return */
{
	if (flags.toplin) {
		curs(tlx, tly);
		if (tlx + 8 > CO)
			putsym('\n'), tly++;
	}

	if (flags.standout)
		standoutbeg();
	putstr("--More--");
	if (flags.standout)
		standoutend();

	xwaitforspace(s);
	if (flags.toplin && tly > 1) {
		home();
		cl_end();
		docorner(1, tly - 1);
	}
	flags.toplin = 0;
}

void
more(void)
{
	xmore("");
}

void
cmore(const char *s)
{
	xmore(s);
}

void
clrlin(void)
{
	if (flags.toplin) {
		home();
		cl_end();
		if (tly > 1)
			docorner(1, tly - 1);
		remember_topl();
	}
	flags.toplin = 0;
}

void
pline(const char *line, ...)
{
	va_list ap;
	va_start(ap, line);
	vpline(line, ap);
	va_end(ap);
}

/*VARARGS1*/
void
vpline(const char *line, va_list ap)
{
	char pbuf[BUFSZ];
	char *bp = pbuf, *tl;
	int n, n0;

	if (!line || !*line)
		return;
	if (!strchr(line, '%'))
		strcpy(pbuf, line);
	else
		vsprintf(pbuf, line, ap);
	if (flags.toplin == 1 && !strcmp(pbuf, toplines))
		return;
	nscr();		/* %% */

	/* If there is room on the line, print message on same line */
	/* But messages like "You die..." deserve their own line */
	n0 = strlen(bp);
	if (flags.toplin == 1 && tly == 1 &&
	    n0 + (int)strlen(toplines) + 3 < CO - 8 && /* room for --More-- */
	    strncmp(bp, "You ", 4)) {
		strcat(toplines, "  ");
		strcat(toplines, bp);
		tlx += 2;
		addtopl(bp);
		return;
	}
	if (flags.toplin == 1)
		more();
	remember_topl();
	toplines[0] = 0;
	while (n0) {
		if (n0 >= CO) {
			/* look for appropriate cut point */
			n0 = 0;
			for (n = 0; n < CO; n++)
				if (bp[n] == ' ')
					n0 = n;
			if (!n0)
				for (n = 0; n < CO - 1; n++)
					if (!letter(bp[n]))
						n0 = n;
			if (!n0)
				n0 = CO - 2;
		}
		strncpy((tl = eos(toplines)), bp, n0);
		tl[n0] = 0;
		bp += n0;

		/* remove trailing spaces, but leave one */
		while (n0 > 1 && tl[n0 - 1] == ' ' && tl[n0 - 2] == ' ')
			tl[--n0] = 0;

		n0 = strlen(bp);
		if (n0 && tl[0])
			strcat(tl, "\n");
	}
	redotoplin();
}

void
putsym(char c)
{
	switch (c) {
	case '\b':
		backsp();
		return;
	case '\n':
		curx = 1;
		cury++;
		if (cury > tly)
			tly = cury;
		break;
	default:
		if (curx == CO)
			putsym('\n');	/* 1 <= curx <= CO; avoid CO */
		else
			curx++;
	}
	putchar(c);
}

void
putstr(const char *s)
{
	while (*s)
		putsym(*s++);
}