vi/v_at.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 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: v_at.c,v 10.8 1996/04/27 11:40:33 bostic Exp $ (Berkeley) $Date: 1996/04/27 11:40:33 $";
  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 <ctype.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24
  25 #include "../common/common.h"
  26 #include "vi.h"
  27
  28 /*
  29  * v_at -- @
  30  *      Execute a buffer.
  31  *
  32  * PUBLIC: int v_at __P((SCR *, VICMD *));
  33  */
  34 int
  35 v_at(sp, vp)
  36         SCR *sp;
  37         VICMD *vp;
  38 {
  39         CB *cbp;
  40         CHAR_T name;
  41         TEXT *tp;
  42         size_t len;
  43         char nbuf[20];
  44
  45         /*
  46          * !!!
  47          * Historically, [@*]<carriage-return> and [@*][@*] executed the most
  48          * recently executed buffer in ex mode.  In vi mode, only @@ repeated
  49          * the last buffer.  We change historic practice and make @* work from
  50          * vi mode as well, it's simpler and more consistent.
  51          *
  52          * My intent is that *[buffer] will, in the future, pass the buffer to
  53          * whatever interpreter is loaded.
  54          */
  55         name = F_ISSET(vp, VC_BUFFER) ? vp->buffer : '@';
  56         if (name == '@' || name == '*') {
  57                 if (!F_ISSET(sp, SC_AT_SET)) {
  58                         ex_emsg(sp, NULL, EXM_NOPREVBUF);
  59                         return (1);
  60                 }
  61                 name = sp->at_lbuf;
  62         }
  63         F_SET(sp, SC_AT_SET);
  64
  65         CBNAME(sp, cbp, name);
  66         if (cbp == NULL) {
  67                 ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF);
  68                 return (1);
  69         }
  70
  71         /* Save for reuse. */
  72         sp->at_lbuf = name;
  73
  74         /*
  75          * The buffer is executed in vi mode, while in vi mode, so simply
  76          * push it onto the terminal queue and continue.
  77          *
  78          * !!!
  79          * Historic practice is that if the buffer was cut in line mode,
  80          * <newlines> were appended to each line as it was pushed onto
  81          * the stack.  If the buffer was cut in character mode, <newlines>
  82          * were appended to all lines but the last one.
  83          *
  84          * XXX
  85          * Historic practice is that execution of an @ buffer could be
  86          * undone by a single 'u' command, i.e. the changes were grouped
  87          * together.  We don't get this right; I'm waiting for the new DB
  88          * logging code to be available.
  89          */
  90         for (tp = cbp->textq.cqh_last;
  91             tp != (void *)&cbp->textq; tp = tp->q.cqe_prev)
  92                 if ((F_ISSET(cbp, CB_LMODE) ||
  93                     tp->q.cqe_next != (void *)&cbp->textq) &&
  94                     v_event_push(sp, NULL, "\n", 1, 0) ||
  95                     v_event_push(sp, NULL, tp->lb, tp->len, 0))
  96                         return (1);
  97
  98         /*
  99          * !!!
 100          * If any count was supplied, it applies to the first command in the
 101          * at buffer.
 102          */
 103         if (F_ISSET(vp, VC_C1SET)) {
 104                 len = snprintf(nbuf, sizeof(nbuf), "%lu", vp->count);
 105                 if (v_event_push(sp, NULL, nbuf, len, 0))
 106                         return (1);
 107         }
 108         return (0);
 109 }