common/screen.c

   1 /*-
   2  * Copyright (c) 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 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 $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <errno.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include "common.h"
  29 #include "../vi/vi.h"
  30
  31 /*
  32  * screen_init --
  33  *      Do the default initialization of an SCR structure.
  34  *
  35  * PUBLIC: int screen_init __P((GS *, SCR *, SCR **));
  36  */
  37 int
  38 screen_init(GS *gp, SCR *orig, SCR **spp)
  39 {
  40         SCR *sp;
  41         size_t len;
  42
  43         *spp = NULL;
  44         CALLOC_RET(orig, sp, SCR *, 1, sizeof(SCR));
  45         *spp = sp;
  46
  47 /* INITIALIZED AT SCREEN CREATE. */
  48         sp->id = ++gp->id;
  49         sp->refcnt = 1;
  50
  51         sp->gp = gp;                    /* All ref the GS structure. */
  52
  53         sp->ccnt = 2;                   /* Anything > 1 */
  54
  55         /*
  56          * XXX
  57          * sp->defscroll is initialized by the opts_init() code because
  58          * we don't have the option information yet.
  59          */
  60
  61         CIRCLEQ_INIT(&sp->tiq);
  62
  63 /* PARTIALLY OR COMPLETELY COPIED FROM PREVIOUS SCREEN. */
  64         if (orig == NULL) {
  65                 sp->searchdir = NOTSET;
  66         } else {
  67                 sp->wp = orig->wp;
  68
  69                 /* Alternate file name. */
  70                 if (orig->alt_name != NULL &&
  71                     (sp->alt_name = strdup(orig->alt_name)) == NULL)
  72                         goto mem;
  73
  74                 /* Last executed at buffer. */
  75                 if (F_ISSET(orig, SC_AT_SET)) {
  76                         F_SET(sp, SC_AT_SET);
  77                         sp->at_lbuf = orig->at_lbuf;
  78                 }
  79
  80                 /* Retain searching/substitution information. */
  81                 sp->searchdir = orig->searchdir == NOTSET ? NOTSET : FORWARD;
  82                 if (orig->re != NULL && (sp->re =
  83                     v_wstrdup(sp, orig->re, orig->re_len)) == NULL)
  84                         goto mem;
  85                 sp->re_len = orig->re_len;
  86                 if (orig->subre != NULL && (sp->subre =
  87                     v_wstrdup(sp, orig->subre, orig->subre_len)) == NULL)
  88                         goto mem;
  89                 sp->subre_len = orig->subre_len;
  90                 if (orig->repl != NULL && (sp->repl =
  91                     v_wstrdup(sp, orig->repl, orig->repl_len)) == NULL)
  92                         goto mem;
  93                 sp->repl_len = orig->repl_len;
  94                 if (orig->newl_len) {
  95                         len = orig->newl_len * sizeof(size_t);
  96                         MALLOC(sp, sp->newl, size_t *, len);
  97                         if (sp->newl == NULL) {
  98 mem:                            msgq(orig, M_SYSERR, NULL);
  99                                 goto err;
 100                         }
 101                         sp->newl_len = orig->newl_len;
 102                         sp->newl_cnt = orig->newl_cnt;
 103                         memcpy(sp->newl, orig->newl, len);
 104                 }
 105
 106                 if (opts_copy(orig, sp))
 107                         goto err;
 108
 109                 F_SET(sp, F_ISSET(orig, SC_EX | SC_VI));
 110         }
 111
 112         if (ex_screen_copy(orig, sp))           /* Ex. */
 113                 goto err;
 114         if (v_screen_copy(orig, sp))            /* Vi. */
 115                 goto err;
 116         sp->cl_private = 0;                     /* XXX */
 117         conv_init(orig, sp);                    /* XXX */
 118
 119         *spp = sp;
 120         return (0);
 121
 122 err:    screen_end(sp);
 123         return (1);
 124 }
 125
 126 /*
 127  * screen_end --
 128  *      Release a screen, no matter what had (and had not) been
 129  *      initialized.
 130  *
 131  * PUBLIC: int screen_end __P((SCR *));
 132  */
 133 int
 134 screen_end(SCR *sp)
 135 {
 136         int rval;
 137
 138         /* If multiply referenced, just decrement the count and return. */
 139          if (--sp->refcnt != 0)
 140                  return (0);
 141
 142         /*
 143          * Remove the screen from the displayed queue.
 144          *
 145          * If a created screen failed during initialization, it may not
 146          * be linked into the chain.
 147          */
 148         if (sp->q.cqe_next != NULL)
 149                 CIRCLEQ_REMOVE(&sp->wp->scrq, sp, q);
 150
 151         /* The screen is no longer real. */
 152         F_CLR(sp, SC_SCR_EX | SC_SCR_VI);
 153
 154         rval = 0;
 155 #ifdef HAVE_PERL_INTERP
 156         if (perl_screen_end(sp))                /* End perl. */
 157                 rval = 1;
 158 #endif
 159         if (v_screen_end(sp))                   /* End vi. */
 160                 rval = 1;
 161         if (ex_screen_end(sp))                  /* End ex. */
 162                 rval = 1;
 163
 164         /* Free file names. */
 165         { char **ap;
 166                 if (!F_ISSET(sp, SC_ARGNOFREE) && sp->argv != NULL) {
 167                         for (ap = sp->argv; *ap != NULL; ++ap)
 168                                 free(*ap);
 169                         free(sp->argv);
 170                 }
 171         }
 172
 173         /* Free any text input. */
 174         if (sp->tiq.cqh_first != NULL)
 175                 text_lfree(&sp->tiq);
 176
 177         /* Free alternate file name. */
 178         if (sp->alt_name != NULL)
 179                 free(sp->alt_name);
 180
 181         /* Free up search information. */
 182         if (sp->re != NULL)
 183                 free(sp->re);
 184         if (F_ISSET(sp, SC_RE_SEARCH))
 185                 regfree(&sp->re_c);
 186         if (sp->subre != NULL)
 187                 free(sp->subre);
 188         if (F_ISSET(sp, SC_RE_SUBST))
 189                 regfree(&sp->subre_c);
 190         if (sp->repl != NULL)
 191                 free(sp->repl);
 192         if (sp->newl != NULL)
 193                 free(sp->newl);
 194
 195         /* Free all the options */
 196         opts_free(sp);
 197
 198         /* Free the screen itself. */
 199         free(sp);
 200
 201         return (rval);
 202 }
 203
 204 /*
 205  * screen_next --
 206  *      Return the next screen in the queue.
 207  *
 208  * PUBLIC: SCR *screen_next __P((SCR *));
 209  */
 210 SCR *
 211 screen_next(SCR *sp)
 212 {
 213         GS *gp;
 214         WIN *wp;
 215         SCR *next;
 216
 217         /* Try the display queue, without returning the current screen. */
 218         gp = sp->gp;
 219         wp = sp->wp;
 220         for (next = wp->scrq.cqh_first;
 221             next != (void *)&wp->scrq; next = next->q.cqe_next)
 222                 if (next != sp)
 223                         break;
 224         if (next != (void *)&wp->scrq)
 225                 return (next);
 226
 227         /* Try the hidden queue; if found, move screen to the display queue. */
 228         if (gp->hq.cqh_first != (void *)&gp->hq) {
 229                 next = gp->hq.cqh_first;
 230                 CIRCLEQ_REMOVE(&gp->hq, next, q);
 231                 CIRCLEQ_INSERT_HEAD(&wp->scrq, next, q);
 232                 next->wp = sp->wp;
 233                 return (next);
 234         }
 235         return (NULL);
 236 }