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 10.21 2001/05/10 19:28:43 skimo Exp $ (Berkeley) $Date: 2001/05/10 19:28:43 $";
  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(gp, orig, spp)
  39         GS *gp;
  40         SCR *orig, **spp;
  41 {
  42         SCR *sp;
  43         size_t len;
  44
  45         *spp = NULL;
  46         CALLOC_RET(orig, sp, SCR *, 1, sizeof(SCR));
  47         *spp = sp;
  48
  49 /* INITIALIZED AT SCREEN CREATE. */
  50         sp->id = ++gp->id;
  51         sp->refcnt = 1;
  52
  53         sp->gp = gp;                    /* All ref the GS structure. */
  54
  55         sp->ccnt = 2;                   /* Anything > 1 */
  56
  57         /*
  58          * XXX
  59          * sp->defscroll is initialized by the opts_init() code because
  60          * we don't have the option information yet.
  61          */
  62
  63         CIRCLEQ_INIT(&sp->tiq);
  64
  65 /* PARTIALLY OR COMPLETELY COPIED FROM PREVIOUS SCREEN. */
  66         if (orig == NULL) {
  67                 sp->searchdir = NOTSET;
  68         } else {
  69                 sp->wp = orig->wp;
  70
  71                 /* Alternate file name. */
  72                 if (orig->alt_name != NULL &&
  73                     (sp->alt_name = strdup(orig->alt_name)) == NULL)
  74                         goto mem;
  75
  76                 /* Last executed at buffer. */
  77                 if (F_ISSET(orig, SC_AT_SET)) {
  78                         F_SET(sp, SC_AT_SET);
  79                         sp->at_lbuf = orig->at_lbuf;
  80                 }
  81
  82                 /* Retain searching/substitution information. */
  83                 sp->searchdir = orig->searchdir == NOTSET ? NOTSET : FORWARD;
  84                 if (orig->re != NULL && (sp->re =
  85                     v_wstrdup(sp, orig->re, orig->re_len)) == NULL)
  86                         goto mem;
  87                 sp->re_len = orig->re_len;
  88                 if (orig->subre != NULL && (sp->subre =
  89                     v_wstrdup(sp, orig->subre, orig->subre_len)) == NULL)
  90                         goto mem;
  91                 sp->subre_len = orig->subre_len;
  92                 if (orig->repl != NULL && (sp->repl =
  93                     v_wstrdup(sp, orig->repl, orig->repl_len)) == NULL)
  94                         goto mem;
  95                 sp->repl_len = orig->repl_len;
  96                 if (orig->newl_len) {
  97                         len = orig->newl_len * sizeof(size_t);
  98                         MALLOC(sp, sp->newl, size_t *, len);
  99                         if (sp->newl == NULL) {
 100 mem:                            msgq(orig, M_SYSERR, NULL);
 101                                 goto err;
 102                         }
 103                         sp->newl_len = orig->newl_len;
 104                         sp->newl_cnt = orig->newl_cnt;
 105                         memcpy(sp->newl, orig->newl, len);
 106                 }
 107
 108                 if (opts_copy(orig, sp))
 109                         goto err;
 110
 111                 F_SET(sp, F_ISSET(orig, SC_EX | SC_VI));
 112         }
 113
 114         if (ex_screen_copy(orig, sp))           /* Ex. */
 115                 goto err;
 116         if (v_screen_copy(orig, sp))            /* Vi. */
 117                 goto err;
 118         sp->cl_private = 0;                     /* XXX */
 119         conv_init(orig, sp);                    /* XXX */
 120
 121         *spp = sp;
 122         return (0);
 123
 124 err:    screen_end(sp);
 125         return (1);
 126 }
 127
 128 /*
 129  * screen_end --
 130  *      Release a screen, no matter what had (and had not) been
 131  *      initialized.
 132  *
 133  * PUBLIC: int screen_end __P((SCR *));
 134  */
 135 int
 136 screen_end(sp)
 137         SCR *sp;
 138 {
 139         int rval;
 140
 141         /* If multiply referenced, just decrement the count and return. */
 142          if (--sp->refcnt != 0)
 143                  return (0);
 144
 145         /*
 146          * Remove the screen from the displayed queue.
 147          *
 148          * If a created screen failed during initialization, it may not
 149          * be linked into the chain.
 150          */
 151         if (sp->q.cqe_next != NULL)
 152                 CIRCLEQ_REMOVE(&sp->wp->scrq, sp, q);
 153
 154         /* The screen is no longer real. */
 155         F_CLR(sp, SC_SCR_EX | SC_SCR_VI);
 156
 157         rval = 0;
 158 #ifdef HAVE_PERL_INTERP
 159         if (perl_screen_end(sp))                /* End perl. */
 160                 rval = 1;
 161 #endif
 162         if (v_screen_end(sp))                   /* End vi. */
 163                 rval = 1;
 164         if (ex_screen_end(sp))                  /* End ex. */
 165                 rval = 1;
 166
 167         /* Free file names. */
 168         { char **ap;
 169                 if (!F_ISSET(sp, SC_ARGNOFREE) && sp->argv != NULL) {
 170                         for (ap = sp->argv; *ap != NULL; ++ap)
 171                                 free(*ap);
 172                         free(sp->argv);
 173                 }
 174         }
 175
 176         /* Free any text input. */
 177         if (sp->tiq.cqh_first != NULL)
 178                 text_lfree(&sp->tiq);
 179
 180         /* Free alternate file name. */
 181         if (sp->alt_name != NULL)
 182                 free(sp->alt_name);
 183
 184         /* Free up search information. */
 185         if (sp->re != NULL)
 186                 free(sp->re);
 187         if (F_ISSET(sp, SC_RE_SEARCH))
 188                 regfree(&sp->re_c);
 189         if (sp->subre != NULL)
 190                 free(sp->subre);
 191         if (F_ISSET(sp, SC_RE_SUBST))
 192                 regfree(&sp->subre_c);
 193         if (sp->repl != NULL)
 194                 free(sp->repl);
 195         if (sp->newl != NULL)
 196                 free(sp->newl);
 197
 198         /* Free all the options */
 199         opts_free(sp);
 200
 201         /* Free the screen itself. */
 202         free(sp);
 203
 204         return (rval);
 205 }
 206
 207 /*
 208  * screen_next --
 209  *      Return the next screen in the queue.
 210  *
 211  * PUBLIC: SCR *screen_next __P((SCR *));
 212  */
 213 SCR *
 214 screen_next(sp)
 215         SCR *sp;
 216 {
 217         GS *gp;
 218         WIN *wp;
 219         SCR *next;
 220
 221         /* Try the display queue, without returning the current screen. */
 222         gp = sp->gp;
 223         wp = sp->wp;
 224         for (next = wp->scrq.cqh_first;
 225             next != (void *)&wp->scrq; next = next->q.cqe_next)
 226                 if (next != sp)
 227                         break;
 228         if (next != (void *)&wp->scrq)
 229                 return (next);
 230
 231         /* Try the hidden queue; if found, move screen to the display queue. */
 232         if (gp->hq.cqh_first != (void *)&gp->hq) {
 233                 next = gp->hq.cqh_first;
 234                 CIRCLEQ_REMOVE(&gp->hq, next, q);
 235                 CIRCLEQ_INSERT_HEAD(&wp->scrq, next, q);
 236                 next->wp = sp->wp;
 237                 return (next);
 238         }
 239         return (NULL);
 240 }