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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: screen.c,v 1.8 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/queue.h>
#include <sys/time.h>

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

#include "common.h"
#include "../vi/vi.h"

/*
 * screen_init --
 *	Do the default initialization of an SCR structure.
 *
 * PUBLIC: int screen_init(GS *, SCR *, SCR **);
 */
int
screen_init(gp, orig, spp)
	GS *gp;
	SCR *orig, **spp;
{
	SCR *sp;
	size_t len;

	*spp = NULL;
	CALLOC_RET(orig, sp, SCR *, 1, sizeof(SCR));
	*spp = sp;

/* INITIALIZED AT SCREEN CREATE. */
	sp->id = ++gp->id;
	sp->refcnt = 1;

	sp->gp = gp;				/* All ref the GS structure. */

	sp->ccnt = 2;				/* Anything > 1 */

	/*
	 * XXX
	 * sp->defscroll is initialized by the opts_init() code because
	 * we don't have the option information yet.
	 */

	CIRCLEQ_INIT(&sp->tiq);

/* PARTIALLY OR COMPLETELY COPIED FROM PREVIOUS SCREEN. */
	if (orig == NULL) {
		sp->searchdir = NOTSET;
	} else {
		/* Alternate file name. */
		if (orig->alt_name != NULL &&
		    (sp->alt_name = strdup(orig->alt_name)) == NULL)
			goto mem;

		/* Last executed at buffer. */
		if (F_ISSET(orig, SC_AT_SET)) {
			F_SET(sp, SC_AT_SET);
			sp->at_lbuf = orig->at_lbuf;
		}

		/* Retain searching/substitution information. */
		sp->searchdir = orig->searchdir == NOTSET ? NOTSET : FORWARD;
		if (orig->re != NULL && (sp->re =
		    v_strdup(sp, orig->re, orig->re_len)) == NULL)
			goto mem;
		sp->re_len = orig->re_len;
		if (orig->subre != NULL && (sp->subre =
		    v_strdup(sp, orig->subre, orig->subre_len)) == NULL)
			goto mem;
		sp->subre_len = orig->subre_len;
		if (orig->repl != NULL && (sp->repl =
		    v_strdup(sp, orig->repl, orig->repl_len)) == NULL)
			goto mem;
		sp->repl_len = orig->repl_len;
		if (orig->newl_len) {
			len = orig->newl_len * sizeof(size_t);
			MALLOC(sp, sp->newl, size_t *, len);
			if (sp->newl == NULL) {
mem:				msgq(orig, M_SYSERR, NULL);
				goto err;
			}
			sp->newl_len = orig->newl_len;
			sp->newl_cnt = orig->newl_cnt;
			memcpy(sp->newl, orig->newl, len);
		}

		if (opts_copy(orig, sp))
			goto err;

		F_SET(sp, F_ISSET(orig, SC_EX | SC_VI));
	}

	if (ex_screen_copy(orig, sp))		/* Ex. */
		goto err;
	if (v_screen_copy(orig, sp))		/* Vi. */
		goto err;

	*spp = sp;
	return (0);

err:	screen_end(sp);
	return (1);
}

/*
 * screen_end --
 *	Release a screen, no matter what had (and had not) been
 *	initialized.
 *
 * PUBLIC: int screen_end(SCR *);
 */
int
screen_end(sp)
	SCR *sp;
{
	int rval;

	/* If multiply referenced, just decrement the count and return. */
	 if (--sp->refcnt != 0)
		 return (0);

	/*
	 * Remove the screen from the displayed queue.
	 *
	 * If a created screen failed during initialization, it may not
	 * be linked into the chain.
	 */
	if (CIRCLEQ_NEXT(sp, q) != NULL)
		CIRCLEQ_REMOVE(&sp->gp->dq, sp, q);

	/* The screen is no longer real. */
	F_CLR(sp, SC_SCR_EX | SC_SCR_VI);

	rval = 0;
#ifdef HAVE_PERL_INTERP
	if (perl_screen_end(sp))		/* End perl. */
		rval = 1;
#endif
	if (v_screen_end(sp))			/* End vi. */
		rval = 1;
	if (ex_screen_end(sp))			/* End ex. */
		rval = 1;

	/* Free file names. */
	{ char **ap;
		if (!F_ISSET(sp, SC_ARGNOFREE) && sp->argv != NULL) {
			for (ap = sp->argv; *ap != NULL; ++ap)
				free(*ap);
			free(sp->argv);
		}
	}

	/* Free any text input. */
	if (CIRCLEQ_FIRST(&sp->tiq) != NULL)
		text_lfree(&sp->tiq);

	/* Free alternate file name. */
	if (sp->alt_name != NULL)
		free(sp->alt_name);

	/* Free up search information. */
	if (sp->re != NULL)
		free(sp->re);
	if (F_ISSET(sp, SC_RE_SEARCH))
		regfree(&sp->re_c);
	if (sp->subre != NULL)
		free(sp->subre);
	if (F_ISSET(sp, SC_RE_SUBST))
		regfree(&sp->subre_c);
	if (sp->repl != NULL)
		free(sp->repl);
	if (sp->newl != NULL)
		free(sp->newl);

	/* Free all the options */
	opts_free(sp);

	/* Free the screen itself. */
	free(sp);

	return (rval);
}

/*
 * screen_next --
 *	Return the next screen in the queue.
 *
 * PUBLIC: SCR *screen_next(SCR *);
 */
SCR *
screen_next(sp)
	SCR *sp;
{
	GS *gp;
	SCR *next;

	/* Try the display queue, without returning the current screen. */
	gp = sp->gp;
	CIRCLEQ_FOREACH(next, &gp->dq, q)
		if (next != sp)
			break;
	if (next != (void *)&gp->dq)
		return (next);

	/* Try the hidden queue; if found, move screen to the display queue. */
	if (CIRCLEQ_FIRST(&gp->hq) != CIRCLEQ_END(&gp->hq)) {
		next = CIRCLEQ_FIRST(&gp->hq);
		CIRCLEQ_REMOVE(&gp->hq, next, q);
		CIRCLEQ_INSERT_HEAD(&gp->dq, next, q);
		return (next);
	}
	return (NULL);
}