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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: cl_term.c,v 1.16 2009/10/27 23:59:47 deraadt Exp $	*/

/*-
 * Copyright (c) 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1993, 1994, 1995, 1996
 *	Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/stat.h>

#include <bitstring.h>
#include <curses.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#include "../common/common.h"
#include "cl.h"

static int cl_pfmap(SCR *, seq_t, CHAR_T *, size_t, CHAR_T *, size_t);

/*
 * XXX
 * THIS REQUIRES THAT ALL SCREENS SHARE A TERMINAL TYPE.
 */
typedef struct _tklist {
	char	*ts;			/* Key's termcap string. */
	char	*output;		/* Corresponding vi command. */
	char	*name;			/* Name. */
	u_char	 value;			/* Special value (for lookup). */
} TKLIST;
static TKLIST const c_tklist[] = {	/* Command mappings. */
	{"kil1",	"O",	"insert line"},
	{"kdch1",	"x",	"delete character"},
	{"kcud1",	"j",	"cursor down"},
	{"kel",		"D",	"delete to eol"},
	{"kind",     "\004",	"scroll down"},			/* ^D */
	{"kll",		"$",	"go to eol"},
	{"khome",	"^",	"go to sol"},
	{"kich1",	"i",	"insert at cursor"},
	{"kdl1",       "dd",	"delete line"},
	{"kcub1",	"h",	"cursor left"},
	{"knp",	     "\006",	"page down"},			/* ^F */
	{"kpp",	     "\002",	"page up"},			/* ^B */
	{"kri",	     "\025",	"scroll up"},			/* ^U */
	{"ked",	       "dG",	"delete to end of screen"},
	{"kcuf1",	"l",	"cursor right"},
	{"kcuu1",	"k",	"cursor up"},
	{NULL},
};
static TKLIST const m1_tklist[] = {	/* Input mappings (lookup). */
	{NULL},
};
static TKLIST const m2_tklist[] = {	/* Input mappings (set or delete). */
	{"kcud1",  "\033ja",	"cursor down"},			/* ^[ja */
	{"kcub1",  "\033ha",	"cursor left"},			/* ^[ha */
	{"kcuu1",  "\033ka",	"cursor up"},			/* ^[ka */
	{"kcuf1",  "\033la",	"cursor right"},		/* ^[la */
	{NULL},
};

/*
 * cl_term_init --
 *	Initialize the special keys defined by the termcap/terminfo entry.
 *
 * PUBLIC: int cl_term_init(SCR *);
 */
int
cl_term_init(sp)
	SCR *sp;
{
	KEYLIST *kp;
	SEQ *qp;
	TKLIST const *tkp;
	char *t;

	/* Command mappings. */
	for (tkp = c_tklist; tkp->name != NULL; ++tkp) {
		if ((t = tigetstr(tkp->ts)) == NULL || t == (char *)-1)
			continue;
		if (seq_set(sp, tkp->name, strlen(tkp->name), t, strlen(t),
		    tkp->output, strlen(tkp->output), SEQ_COMMAND,
		    SEQ_NOOVERWRITE | SEQ_SCREEN))
			return (1);
	}

	/* Input mappings needing to be looked up. */
	for (tkp = m1_tklist; tkp->name != NULL; ++tkp) {
		if ((t = tigetstr(tkp->ts)) == NULL || t == (char *)-1)
			continue;
		for (kp = keylist;; ++kp)
			if (kp->value == tkp->value)
				break;
		if (kp == NULL)
			continue;
		if (seq_set(sp, tkp->name, strlen(tkp->name), t, strlen(t),
		    &kp->ch, 1, SEQ_INPUT, SEQ_NOOVERWRITE | SEQ_SCREEN))
			return (1);
	}

	/* Input mappings that are already set or are text deletions. */
	for (tkp = m2_tklist; tkp->name != NULL; ++tkp) {
		if ((t = tigetstr(tkp->ts)) == NULL || t == (char *)-1)
			continue;
		/*
		 * !!!
		 * Some terminals' <cursor_left> keys send single <backspace>
		 * characters.  This is okay in command mapping, but not okay
		 * in input mapping.  That combination is the only one we'll
		 * ever see, hopefully, so kluge it here for now.
		 */
		if (!strcmp(t, "\b"))
			continue;
		if (tkp->output == NULL) {
			if (seq_set(sp, tkp->name, strlen(tkp->name),
			    t, strlen(t), NULL, 0,
			    SEQ_INPUT, SEQ_NOOVERWRITE | SEQ_SCREEN))
				return (1);
		} else
			if (seq_set(sp, tkp->name, strlen(tkp->name),
			    t, strlen(t), tkp->output, strlen(tkp->output),
			    SEQ_INPUT, SEQ_NOOVERWRITE | SEQ_SCREEN))
				return (1);
	}

	/*
	 * Rework any function key mappings that were set before the
	 * screen was initialized.
	 */
	LIST_FOREACH(qp, & sp->gp->seqq, q)
		if (F_ISSET(qp, SEQ_FUNCMAP))
			(void)cl_pfmap(sp, qp->stype,
			    qp->input, qp->ilen, qp->output, qp->olen);
	return (0);
}

/*
 * cl_term_end --
 *	End the special keys defined by the termcap/terminfo entry.
 *
 * PUBLIC: int cl_term_end(GS *);
 */
int
cl_term_end(gp)
	GS *gp;
{
	SEQ *qp, *nqp;

	/* Delete screen specific mappings. */
	for (qp = LIST_FIRST(&gp->seqq); qp != NULL; qp = nqp) {
		nqp = LIST_NEXT(qp, q);
		if (F_ISSET(qp, SEQ_SCREEN))
			(void)seq_mdel(qp);
	}
	return (0);
}

/*
 * cl_fmap --
 *	Map a function key.
 *
 * PUBLIC: int cl_fmap(SCR *, seq_t, CHAR_T *, size_t, CHAR_T *, size_t);
 */
int
cl_fmap(sp, stype, from, flen, to, tlen)
	SCR *sp;
	seq_t stype;
	CHAR_T *from, *to;
	size_t flen, tlen;
{
	/* Ignore until the screen is running, do the real work then. */
	if (F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_SCR_VI))
		return (0);
	if (F_ISSET(sp, SC_EX) && !F_ISSET(sp, SC_SCR_EX))
		return (0);

	return (cl_pfmap(sp, stype, from, flen, to, tlen));
}

/*
 * cl_pfmap --
 *	Map a function key (private version).
 */
static int
cl_pfmap(sp, stype, from, flen, to, tlen)
	SCR *sp;
	seq_t stype;
	CHAR_T *from, *to;
	size_t flen, tlen;
{
	size_t nlen;
	char *p, key_name[64];

	(void)snprintf(key_name, sizeof(key_name), "kf%d", atoi(from + 1));
	if ((p = tigetstr(key_name)) == NULL ||
	    p == (char *)-1 || strlen(p) == 0)
		p = NULL;
	if (p == NULL) {
		msgq_str(sp, M_ERR, from, "233|This terminal has no %s key");
		return (1);
	}

	nlen = snprintf(key_name,
	    sizeof(key_name), "function key %d", atoi(from + 1));
	if (nlen >= sizeof(key_name))
		nlen = sizeof(key_name) - 1;
	return (seq_set(sp, key_name, nlen,
	    p, strlen(p), to, tlen, stype, SEQ_NOOVERWRITE | SEQ_SCREEN));
}

/*
 * cl_optchange --
 *	Curses screen specific "option changed" routine.
 *
 * PUBLIC: int cl_optchange(SCR *, int, char *, u_long *);
 */
int
cl_optchange(sp, opt, str, valp)
	SCR *sp;
	int opt;
	char *str;
	u_long *valp;
{
	CL_PRIVATE *clp;

	clp = CLP(sp);

	switch (opt) {
	case O_COLUMNS:
	case O_LINES:
	case O_TERM:
		/*
		 * Changing the columns, lines or terminal require that
		 * we restart the screen.
		 */
		F_SET(sp->gp, G_SRESTART);
		F_CLR(sp, SC_SCR_EX | SC_SCR_VI);
		break;
	case O_MESG:
		(void)cl_omesg(sp, clp, !*valp);
		break;
	case O_WINDOWNAME:
		if (*valp) {
			F_CLR(clp, CL_RENAME_OK);

			(void)cl_rename(sp, NULL, 0);
		} else {
			F_SET(clp, CL_RENAME_OK);

			/*
			 * If the screen is live, i.e. we're not reading the
			 * .exrc file, update the window.
			 */
			if (sp->frp != NULL && sp->frp->name != NULL)
				(void)cl_rename(sp, sp->frp->name, 1);
		}
		break;
	}
	return (0);
}

/*
 * cl_omesg --
 *	Turn the tty write permission on or off.
 *
 * PUBLIC: int cl_omesg(SCR *, CL_PRIVATE *, int);
 */
int
cl_omesg(sp, clp, on)
	SCR *sp;
	CL_PRIVATE *clp;
	int on;
{
	struct stat sb;
	char *tty;

	/* Find the tty, get the current permissions. */
	if ((tty = ttyname(STDERR_FILENO)) == NULL) {
		if (sp != NULL)
			msgq(sp, M_SYSERR, "stderr");
		return (1);
	}
	if (stat(tty, &sb) < 0) {
		if (sp != NULL)
			msgq(sp, M_SYSERR, "%s", tty);
		return (1);
	}

	/* Save the original status if it's unknown. */
	if (clp->tgw == TGW_UNKNOWN)
		clp->tgw = sb.st_mode & S_IWGRP ? TGW_SET : TGW_UNSET;

	/* Toggle the permissions. */
	if (on) {
		if (chmod(tty, sb.st_mode | S_IWGRP) < 0) {
			if (sp != NULL)
				msgq(sp, M_SYSERR,
				    "046|messages not turned on: %s", tty);
			return (1);
		}
	} else
		if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0) {
			if (sp != NULL)
				msgq(sp, M_SYSERR,
				    "045|messages not turned off: %s", tty);
			return (1);
		}
	return (0);
}

/*
 * cl_ssize --
 *	Return the terminal size.
 *
 * PUBLIC: int cl_ssize(SCR *, int, size_t *, size_t *, int *);
 */
int
cl_ssize(sp, sigwinch, rowp, colp, changedp)
	SCR *sp;
	int sigwinch;
	size_t *rowp, *colp;
	int *changedp;
{
#ifdef TIOCGWINSZ
	struct winsize win;
#endif
	size_t col, row;
	int rval;
	char *p;

	/* Assume it's changed. */
	if (changedp != NULL)
		*changedp = 1;

	/*
	 * !!!
	 * sp may be NULL.
	 *
	 * Get the screen rows and columns.  If the values are wrong, it's
	 * not a big deal -- as soon as the user sets them explicitly the
	 * environment will be set and the screen package will use the new
	 * values.
	 *
	 * Try TIOCGWINSZ.
	 */
	row = col = 0;
#ifdef TIOCGWINSZ
	if (ioctl(STDERR_FILENO, TIOCGWINSZ, &win) != -1) {
		row = win.ws_row;
		col = win.ws_col;
	}
#endif
	/* If here because of suspend or a signal, only trust TIOCGWINSZ. */
	if (sigwinch) {
		/*
		 * Somebody didn't get TIOCGWINSZ right, or has suspend
		 * without window resizing support.  The user just lost,
		 * but there's nothing we can do.
		 */
		if (row == 0 || col == 0) {
			if (changedp != NULL)
				*changedp = 0;
			return (0);
		}

		/*
		 * SunOS systems deliver SIGWINCH when windows are uncovered
		 * as well as when they change size.  In addition, we call
		 * here when continuing after being suspended since the window
		 * may have changed size.  Since we don't want to background
		 * all of the screens just because the window was uncovered,
		 * ignore the signal if there's no change.
		 */
		if (sp != NULL &&
		    row == O_VAL(sp, O_LINES) && col == O_VAL(sp, O_COLUMNS)) {
			if (changedp != NULL)
				*changedp = 0;
			return (0);
		}

		if (rowp != NULL)
			*rowp = row;
		if (colp != NULL)
			*colp = col;
		return (0);
	}

	/*
	 * !!!
	 * If TIOCGWINSZ failed, or had entries of 0, try termcap.  This
	 * routine is called before any termcap or terminal information
	 * has been set up.  If there's no TERM environmental variable set,
	 * let it go, at least ex can run.
	 */
	if (row == 0 || col == 0) {
		if ((p = getenv("TERM")) == NULL)
			goto noterm;
		if (row == 0) {
			if ((rval = tigetnum("lines")) < 0)
				msgq(sp, M_SYSERR, "tigetnum: lines");
			else
				row = rval;
		}
		if (col == 0) {
			if ((rval = tigetnum("cols")) < 0)
				msgq(sp, M_SYSERR, "tigetnum: cols");
			else
				col = rval;
		}
	}

	/* If nothing else, well, it's probably a VT100. */
noterm:	if (row == 0)
		row = 24;
	if (col == 0)
		col = 80;

	/*
	 * !!!
	 * POSIX 1003.2 requires the environment to override everything.
	 * Often, people can get nvi to stop messing up their screen by
	 * deleting the LINES and COLUMNS environment variables from their
	 * dot-files.
	 */
	if ((p = getenv("LINES")) != NULL)
		row = strtol(p, NULL, 10);
	if ((p = getenv("COLUMNS")) != NULL)
		col = strtol(p, NULL, 10);

	if (rowp != NULL)
		*rowp = row;
	if (colp != NULL)
		*colp = col;
	return (0);
}

#ifdef _USE_OLD_CURSES_
/*
 * cl_putchar --
 *	Function version of putchar, for tputs.
 *
 * PUBLIC: int cl_putchar(int);
 */
void
cl_putchar(ch)
	int ch;
{
	(void)putchar(ch);
}
#else
/*
 * cl_putchar --
 *	Function version of putchar, for tputs.
 *
 * PUBLIC: int cl_putchar(int);
 */
int
cl_putchar(ch)
	int ch;
{
	return (putchar(ch));
}
#endif