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 10.10 2000/07/16 20:49:34 skimo Exp $ (Berkeley) $Date: 2000/07/16 20:49:34 $";
  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         CHAR_T wbuf[20];
  45         CHAR_T *wp;
  46         size_t wlen;
  47
  48         /*
  49          * !!!
  50          * Historically, [@*]<carriage-return> and [@*][@*] executed the most
  51          * recently executed buffer in ex mode.  In vi mode, only @@ repeated
  52          * the last buffer.  We change historic practice and make @* work from
  53          * vi mode as well, it's simpler and more consistent.
  54          *
  55          * My intent is that *[buffer] will, in the future, pass the buffer to
  56          * whatever interpreter is loaded.
  57          */
  58         name = F_ISSET(vp, VC_BUFFER) ? vp->buffer : '@';
  59         if (name == '@' || name == '*') {
  60                 if (!F_ISSET(sp, SC_AT_SET)) {
  61                         ex_emsg(sp, NULL, EXM_NOPREVBUF);
  62                         return (1);
  63                 }
  64                 name = sp->at_lbuf;
  65         }
  66         F_SET(sp, SC_AT_SET);
  67
  68         CBNAME(sp, cbp, name);
  69         if (cbp == NULL) {
  70                 ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF);
  71                 return (1);
  72         }
  73
  74         /* Save for reuse. */
  75         sp->at_lbuf = name;
  76
  77         /*
  78          * The buffer is executed in vi mode, while in vi mode, so simply
  79          * push it onto the terminal queue and continue.
  80          *
  81          * !!!
  82          * Historic practice is that if the buffer was cut in line mode,
  83          * <newlines> were appended to each line as it was pushed onto
  84          * the stack.  If the buffer was cut in character mode, <newlines>
  85          * were appended to all lines but the last one.
  86          *
  87          * XXX
  88          * Historic practice is that execution of an @ buffer could be
  89          * undone by a single 'u' command, i.e. the changes were grouped
  90          * together.  We don't get this right; I'm waiting for the new DB
  91          * logging code to be available.
  92          */
  93         for (tp = cbp->textq.cqh_last;
  94             tp != (void *)&cbp->textq; tp = tp->q.cqe_prev) {
  95                 static CHAR_T nl[] = { '\n', 0 };
  96                 if ((F_ISSET(cbp, CB_LMODE) ||
  97                     tp->q.cqe_next != (void *)&cbp->textq) &&
  98                     v_event_push(sp, NULL, nl, 1, 0) ||
  99                     v_event_push(sp, NULL, tp->lb, tp->len, 0))
 100                         return (1);
 101         }
 102
 103         /*
 104          * !!!
 105          * If any count was supplied, it applies to the first command in the
 106          * at buffer.
 107          */
 108         if (F_ISSET(vp, VC_C1SET)) {
 109                 len = snprintf(nbuf, sizeof(nbuf), "%lu", vp->count);
 110                 CHAR2INT(sp, nbuf, len, wp, wlen);
 111                 MEMCPYW(wbuf, wp, wlen);
 112                 if (v_event_push(sp, NULL, wp, wlen, 0))
 113                         return (1);
 114         }
 115         return (0);
 116 }