external/bsd/nvi/dist/ip/ip_screen.c

   1 /*      $NetBSD: ip_screen.c,v 1.2 2013/11/22 15:52:05 christos Exp $   */
   2 /*-
   3  * Copyright (c) 1996
   4  *      Keith Bostic.  All rights reserved.
   5  *
   6  * See the LICENSE file for redistribution information.
   7  */
   8
   9 #include "config.h"
  10
  11 #ifndef lint
  12 static const char sccsid[] = "Id: ip_screen.c,v 8.8 2001/06/25 15:19:24 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:24 ";
  13 #endif /* not lint */
  14
  15 #include <sys/types.h>
  16 #include <sys/queue.h>
  17
  18 #include <bitstring.h>
  19 #include <stdio.h>
  20
  21 #include "../common/common.h"
  22 #include "../ipc/ip.h"
  23
  24 /*
  25  * ip_screen --
  26  *      Initialize/shutdown the IP screen.
  27  *
  28  * PUBLIC: int ip_screen __P((SCR *, u_int32_t));
  29  */
  30 int
  31 ip_screen(SCR *sp, u_int32_t flags)
  32 {
  33         GS *gp;
  34         IP_PRIVATE *ipp;
  35
  36         gp = sp->gp;
  37         ipp = IPP(sp);
  38
  39         /* See if the current information is incorrect. */
  40         if (F_ISSET(gp, G_SRESTART)) {
  41                 if (ip_quit(sp->wp))
  42                         return (1);
  43                 F_CLR(gp, G_SRESTART);
  44         }
  45
  46         /* See if we're already in the right mode. */
  47         if ((LF_ISSET(SC_EX) && F_ISSET(sp, SC_SCR_EX)) ||
  48             (LF_ISSET(SC_VI) && F_ISSET(sp, SC_SCR_VI)))
  49                 return (0);
  50
  51         /* Ex isn't possible if there is no terminal. */
  52         if (LF_ISSET(SC_EX) && ipp->t_fd == -1)
  53                 return (1);
  54
  55         if (F_ISSET(sp, SC_SCR_EX))
  56                 F_CLR(sp, SC_SCR_EX);
  57
  58         if (F_ISSET(sp, SC_SCR_VI))
  59                 F_CLR(sp, SC_SCR_VI);
  60
  61         if (LF_ISSET(SC_EX)) {
  62                 F_SET(ipp, IP_IN_EX);
  63         } else {
  64                 /* Initialize terminal based information. */
  65                 if (ip_term_init(sp))
  66                         return (1);
  67
  68                 F_CLR(ipp, IP_IN_EX);
  69                 F_SET(ipp, IP_SCR_VI_INIT);
  70         }
  71         return (0);
  72 }
  73
  74 /*
  75  * ip_quit --
  76  *      Shutdown the screens.
  77  *
  78  * PUBLIC: int ip_quit __P((WIN *));
  79  */
  80 int
  81 ip_quit(WIN *wp)
  82 {
  83         IP_PRIVATE *ipp;
  84         int rval;
  85
  86         /* Clean up the terminal mappings. */
  87         rval = ip_term_end(wp->gp);
  88
  89         ipp = WIPP(wp);
  90         F_CLR(ipp, IP_SCR_VI_INIT);
  91
  92         return (rval);
  93 }