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 #include "../perl_api/extern.h"
  31
  32 /*
  33  * screen_init --
  34  *      Do the default initialization of an SCR structure.
  35  *
  36  * PUBLIC: int screen_init __P((GS *, SCR *, SCR **));
  37  */
  38 int
  39 screen_init(GS *gp, SCR *orig, SCR **spp)
  40 {
  41         SCR *sp;
  42         size_t len;
  43
  44         *spp = NULL;
  45         CALLOC_RET(orig, sp, SCR *, 1, sizeof(SCR));
  46         *spp = sp;
  47
  48 /* INITIALIZED AT SCREEN CREATE. */
  49         sp->id = ++gp->id;
  50         sp->refcnt = 1;
  51
  52         sp->gp = gp;                    /* All ref the GS structure. */
  53
  54         sp->ccnt = 2;                   /* Anything > 1 */
  55
  56         /*
  57          * XXX
  58          * sp->defscroll is initialized by the opts_init() code because
  59          * we don't have the option information yet.
  60          */
  61
  62         CIRCLEQ_INIT(&sp->tiq);
  63
  64 /* PARTIALLY OR COMPLETELY COPIED FROM PREVIOUS SCREEN. */
  65         if (orig == NULL) {
  66                 sp->searchdir = NOTSET;
  67         } else {
  68                 sp->wp = orig->wp;
  69
  70                 /* Alternate file name. */
  71                 if (orig->alt_name != NULL &&
  72                     (sp->alt_name = strdup(orig->alt_name)) == NULL)
  73                         goto mem;
  74
  75                 /* Last executed at buffer. */
  76                 if (F_ISSET(orig, SC_AT_SET)) {
  77                         F_SET(sp, SC_AT_SET);
  78                         sp->at_lbuf = orig->at_lbuf;
  79                 }
  80
  81                 /* Retain searching/substitution information. */
  82                 sp->searchdir = orig->searchdir == NOTSET ? NOTSET : FORWARD;
  83                 if (orig->re != NULL && (sp->re =
  84                     v_wstrdup(sp, orig->re, orig->re_len)) == NULL)
  85                         goto mem;
  86                 sp->re_len = orig->re_len;
  87                 if (orig->subre != NULL && (sp->subre =
  88                     v_wstrdup(sp, orig->subre, orig->subre_len)) == NULL)
  89                         goto mem;
  90                 sp->subre_len = orig->subre_len;
  91                 if (orig->repl != NULL && (sp->repl =
  92                     v_wstrdup(sp, orig->repl, orig->repl_len)) == NULL)
  93                         goto mem;
  94                 sp->repl_len = orig->repl_len;
  95                 if (orig->newl_len) {
  96                         len = orig->newl_len * sizeof(size_t);
  97                         MALLOC(sp, sp->newl, size_t *, len);
  98                         if (sp->newl == NULL) {
  99 mem:                            msgq(orig, M_SYSERR, NULL);
 100                                 goto err;
 101                         }
 102                         sp->newl_len = orig->newl_len;
 103                         sp->newl_cnt = orig->newl_cnt;
 104                         memcpy(sp->newl, orig->newl, len);
 105                 }
 106
 107                 if (opts_copy(orig, sp))
 108                         goto err;
 109
 110                 F_SET(sp, F_ISSET(orig, SC_EX | SC_VI));
 111         }
 112
 113         if (ex_screen_copy(orig, sp))           /* Ex. */
 114                 goto err;
 115         if (v_screen_copy(orig, sp))            /* Vi. */
 116                 goto err;
 117         sp->cl_private = 0;                     /* XXX */
 118         conv_init(orig, sp);                    /* XXX */
 119
 120         *spp = sp;
 121         return (0);
 122
 123 err:    screen_end(sp);
 124         return (1);
 125 }
 126
 127 /*
 128  * screen_end --
 129  *      Release a screen, no matter what had (and had not) been
 130  *      initialized.
 131  *
 132  * PUBLIC: int screen_end __P((SCR *));
 133  */
 134 int
 135 screen_end(SCR *sp)
 136 {
 137         int rval;
 138
 139         /* If multiply referenced, just decrement the count and return. */
 140          if (--sp->refcnt != 0)
 141                  return (0);
 142
 143         /*
 144          * Remove the screen from the displayed queue.
 145          *
 146          * If a created screen failed during initialization, it may not
 147          * be linked into the chain.
 148          */
 149         if (sp->q.cqe_next != NULL)
 150                 CIRCLEQ_REMOVE(&sp->wp->scrq, sp, q);
 151
 152         /* The screen is no longer real. */
 153         F_CLR(sp, SC_SCR_EX | SC_SCR_VI);
 154
 155         rval = 0;
 156 #ifdef HAVE_PERL_INTERP
 157         if (perl_screen_end(sp))                /* End perl. */
 158                 rval = 1;
 159 #endif
 160         if (v_screen_end(sp))                   /* End vi. */
 161                 rval = 1;
 162         if (ex_screen_end(sp))                  /* End ex. */
 163                 rval = 1;
 164
 165         /* Free file names. */
 166         { char **ap;
 167                 if (!F_ISSET(sp, SC_ARGNOFREE) && sp->argv != NULL) {
 168                         for (ap = sp->argv; *ap != NULL; ++ap)
 169                                 free(*ap);
 170                         free(sp->argv);
 171                 }
 172         }
 173
 174         /* Free any text input. */
 175         if (sp->tiq.cqh_first != NULL)
 176                 text_lfree(&sp->tiq);
 177
 178         /* Free alternate file name. */
 179         if (sp->alt_name != NULL)
 180                 free(sp->alt_name);
 181
 182         /* Free up search information. */
 183         if (sp->re != NULL)
 184                 free(sp->re);
 185         if (F_ISSET(sp, SC_RE_SEARCH))
 186                 regfree(&sp->re_c);
 187         if (sp->subre != NULL)
 188                 free(sp->subre);
 189         if (F_ISSET(sp, SC_RE_SUBST))
 190                 regfree(&sp->subre_c);
 191         if (sp->repl != NULL)
 192                 free(sp->repl);
 193         if (sp->newl != NULL)
 194                 free(sp->newl);
 195
 196         /* Free all the options */
 197         opts_free(sp);
 198
 199         /* Free the screen itself. */
 200         free(sp);
 201
 202         return (rval);
 203 }
 204
 205 /*
 206  * screen_next --
 207  *      Return the next screen in the queue.
 208  *
 209  * PUBLIC: SCR *screen_next __P((SCR *));
 210  */
 211 SCR *
 212 screen_next(SCR *sp)
 213 {
 214         GS *gp;
 215         WIN *wp;
 216         SCR *next;
 217
 218         /* Try the display queue, without returning the current screen. */
 219         gp = sp->gp;
 220         wp = sp->wp;
 221         for (next = wp->scrq.cqh_first;
 222             next != (void *)&wp->scrq; next = next->q.cqe_next)
 223                 if (next != sp)
 224                         break;
 225         if (next != (void *)&wp->scrq)
 226                 return (next);
 227
 228         /* Try the hidden queue; if found, move screen to the display queue. */
 229         if (gp->hq.cqh_first != (void *)&gp->hq) {
 230                 next = gp->hq.cqh_first;
 231                 CIRCLEQ_REMOVE(&gp->hq, next, q);
 232                 CIRCLEQ_INSERT_HEAD(&wp->scrq, next, q);
 233                 next->wp = sp->wp;
 234                 return (next);
 235         }
 236         return (NULL);
 237 }