/*      $NetBSD: screen.c,v 1.8 2014/01/26 21:43:45 christos 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/cdefs.h>
#if 0
#ifndef lint
static const char sccsid[] = "Id: screen.c,v 10.22 2001/06/25 15:19:12 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:12 ";
#endif /* not lint */
#else
__RCSID("$NetBSD: screen.c,v 1.8 2014/01/26 21:43:45 christos Exp $");
#endif

#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"

static int screen_end1(SCR *, int);
/*
* screen_init --
*      Do the default initialization of an SCR structure.
*
* PUBLIC: int screen_init __P((GS *, SCR *, SCR **));
*/
int
screen_init(GS *gp, SCR *orig, SCR **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.
        */

       TAILQ_INIT(&sp->tiq);

/* PARTIALLY OR COMPLETELY COPIED FROM PREVIOUS SCREEN. */
       if (orig == NULL) {
               sp->searchdir = NOTSET;
       } else {
               sp->wp = orig->wp;

               /* 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_wstrdup(sp, orig->re, orig->re_len)) == NULL)
                       goto mem;
               sp->re_len = orig->re_len;
               if (orig->subre != NULL && (sp->subre =
                   v_wstrdup(sp, orig->subre, orig->subre_len)) == NULL)
                       goto mem;
               sp->subre_len = orig->subre_len;
               if (orig->repl != NULL && (sp->repl =
                   v_wstrdup(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;
       sp->cl_private = 0;                     /* XXX */
       conv_init(orig, sp);                    /* XXX */

       *spp = sp;
       return (0);

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

static int
screen_end1(SCR *sp, int init)
{
       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.
        *
        * XXX screen_end can be called multiple times, abuse the tqe_prev pointer
        * to signal wether the tailq node is on-list.
        */
       if (init && sp->q.tqe_prev) {
               TAILQ_REMOVE(&sp->wp->scrq, sp, q);
               sp->q.tqe_prev = NULL;
       }

       /* 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 (!TAILQ_EMPTY(&sp->tiq))
               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_fini --
*      Release a screen, that has not been chained to the screen queues.
*
* PUBLIC: int screen_fini __P((SCR *));
*/
int
screen_fini(SCR *sp)
{
       return screen_end1(sp, 0);
}

/*
* screen_end --
*      Release a screen, that has been chained to the screen queues.
*
* PUBLIC: int screen_end __P((SCR *));
*/
int
screen_end(SCR *sp)
{
       return screen_end1(sp, 1);
}
/*
* screen_next --
*      Return the next screen in the queue.
*
* PUBLIC: SCR *screen_next __P((SCR *));
*/
SCR *
screen_next(SCR *sp)
{
       GS *gp;
       WIN *wp;
       SCR *next;

       /* Try the display queue, without returning the current screen. */
       gp = sp->gp;
       wp = sp->wp;
       TAILQ_FOREACH(next, &wp->scrq, q)
               if (next != sp)
                       break;
       if (next != NULL)
               return (next);

       /* Try the hidden queue; if found, move screen to the display queue. */
       if ((next = TAILQ_FIRST(&gp->hq)) != NULL) {
               TAILQ_REMOVE(&gp->hq, next, q);
               TAILQ_INSERT_HEAD(&wp->scrq, next, q);
               next->wp = sp->wp;
               return (next);
       }
       return (NULL);
}

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