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 10.11 2001/06/25 15:19:30 skimo Exp $ (Berkeley) $Date: 2001/06/25 15:19:30 $";
  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 #include <string.h>
  25
  26 #include "../common/common.h"
  27 #include "vi.h"
  28
  29 /*
  30  * v_at -- @
  31  *      Execute a buffer.
  32  *
  33  * PUBLIC: int v_at __P((SCR *, VICMD *));
  34  */
  35 int
  36 v_at(SCR *sp, VICMD *vp)
  37 {
  38         CB *cbp;
  39         CHAR_T name;
  40         TEXT *tp;
  41         size_t len;
  42         char nbuf[20];
  43         CHAR_T wbuf[20];
  44         CHAR_T *wp;
  45         size_t wlen;
  46
  47         /*
  48          * !!!
  49          * Historically, [@*]<carriage-return> and [@*][@*] executed the most
  50          * recently executed buffer in ex mode.  In vi mode, only @@ repeated
  51          * the last buffer.  We change historic practice and make @* work from
  52          * vi mode as well, it's simpler and more consistent.
  53          *
  54          * My intent is that *[buffer] will, in the future, pass the buffer to
  55          * whatever interpreter is loaded.
  56          */
  57         name = F_ISSET(vp, VC_BUFFER) ? vp->buffer : '@';
  58         if (name == '@' || name == '*') {
  59                 if (!F_ISSET(sp, SC_AT_SET)) {
  60                         ex_emsg(sp, NULL, EXM_NOPREVBUF);
  61                         return (1);
  62                 }
  63                 name = sp->at_lbuf;
  64         }
  65         F_SET(sp, SC_AT_SET);
  66
  67         CBNAME(sp, cbp, name);
  68         if (cbp == NULL) {
  69                 ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF);
  70                 return (1);
  71         }
  72
  73         /* Save for reuse. */
  74         sp->at_lbuf = name;
  75
  76         /*
  77          * The buffer is executed in vi mode, while in vi mode, so simply
  78          * push it onto the terminal queue and continue.
  79          *
  80          * !!!
  81          * Historic practice is that if the buffer was cut in line mode,
  82          * <newlines> were appended to each line as it was pushed onto
  83          * the stack.  If the buffer was cut in character mode, <newlines>
  84          * were appended to all lines but the last one.
  85          *
  86          * XXX
  87          * Historic practice is that execution of an @ buffer could be
  88          * undone by a single 'u' command, i.e. the changes were grouped
  89          * together.  We don't get this right; I'm waiting for the new DB
  90          * logging code to be available.
  91          */
  92         for (tp = cbp->textq.cqh_last;
  93             tp != (void *)&cbp->textq; tp = tp->q.cqe_prev) {
  94                 static CHAR_T nl[] = { '\n', 0 };
  95                 if ((F_ISSET(cbp, CB_LMODE) ||
  96                     tp->q.cqe_next != (void *)&cbp->textq) &&
  97                     v_event_push(sp, NULL, nl, 1, 0) ||
  98                     v_event_push(sp, NULL, tp->lb, tp->len, 0))
  99                         return (1);
 100         }
 101
 102         /*
 103          * !!!
 104          * If any count was supplied, it applies to the first command in the
 105          * at buffer.
 106          */
 107         if (F_ISSET(vp, VC_C1SET)) {
 108                 len = snprintf(nbuf, sizeof(nbuf), "%lu", vp->count);
 109                 CHAR2INT(sp, nbuf, len, wp, wlen);
 110                 MEMCPYW(wbuf, wp, wlen);
 111                 if (v_event_push(sp, NULL, wp, wlen, 0))
 112                         return (1);
 113         }
 114         return (0);
 115 }