dist/nvi/vi/v_at.c

   1 /*      $NetBSD: v_at.c,v 1.2 2008/12/05 22:51:43 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   7  *      Keith Bostic.  All rights reserved.
   8  *
   9  * See the LICENSE file for redistribution information.
  10  */
  11
  12 #include "config.h"
  13
  14 #ifndef lint
  15 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";
  16 #endif /* not lint */
  17
  18 #include <sys/types.h>
  19 #include <sys/queue.h>
  20 #include <sys/time.h>
  21
  22 #include <bitstring.h>
  23 #include <ctype.h>
  24 #include <limits.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27
  28 #include "../common/common.h"
  29 #include "vi.h"
  30
  31 /*
  32  * v_at -- @
  33  *      Execute a buffer.
  34  *
  35  * PUBLIC: int v_at __P((SCR *, VICMD *));
  36  */
  37 int
  38 v_at(SCR *sp, VICMD *vp)
  39 {
  40         CB *cbp;
  41         CHAR_T name;
  42         TEXT *tp;
  43         size_t len;
  44         char nbuf[20];
  45         CHAR_T wbuf[20];
  46         const CHAR_T *wp;
  47         size_t wlen;
  48
  49         /*
  50          * !!!
  51          * Historically, [@*]<carriage-return> and [@*][@*] executed the most
  52          * recently executed buffer in ex mode.  In vi mode, only @@ repeated
  53          * the last buffer.  We change historic practice and make @* work from
  54          * vi mode as well, it's simpler and more consistent.
  55          *
  56          * My intent is that *[buffer] will, in the future, pass the buffer to
  57          * whatever interpreter is loaded.
  58          */
  59         name = F_ISSET(vp, VC_BUFFER) ? vp->buffer : '@';
  60         if (name == '@' || name == '*') {
  61                 if (!F_ISSET(sp, SC_AT_SET)) {
  62                         ex_emsg(sp, NULL, EXM_NOPREVBUF);
  63                         return (1);
  64                 }
  65                 name = sp->at_lbuf;
  66         }
  67         F_SET(sp, SC_AT_SET);
  68
  69         CBNAME(sp, cbp, name);
  70         if (cbp == NULL) {
  71                 ex_emsg(sp, (char *)KEY_NAME(sp, name), EXM_EMPTYBUF);
  72                 return (1);
  73         }
  74
  75         /* Save for reuse. */
  76         sp->at_lbuf = name;
  77
  78         /*
  79          * The buffer is executed in vi mode, while in vi mode, so simply
  80          * push it onto the terminal queue and continue.
  81          *
  82          * !!!
  83          * Historic practice is that if the buffer was cut in line mode,
  84          * <newlines> were appended to each line as it was pushed onto
  85          * the stack.  If the buffer was cut in character mode, <newlines>
  86          * were appended to all lines but the last one.
  87          *
  88          * XXX
  89          * Historic practice is that execution of an @ buffer could be
  90          * undone by a single 'u' command, i.e. the changes were grouped
  91          * together.  We don't get this right; I'm waiting for the new DB
  92          * logging code to be available.
  93          */
  94         for (tp = cbp->textq.cqh_last;
  95             tp != (void *)&cbp->textq; tp = tp->q.cqe_prev) {
  96                 static CHAR_T nl[] = { '\n', 0 };
  97                 if (((F_ISSET(cbp, CB_LMODE) ||
  98                     tp->q.cqe_next != (void *)&cbp->textq) &&
  99                     v_event_push(sp, NULL, nl, 1, 0)) ||
 100                     v_event_push(sp, NULL, tp->lb, tp->len, 0))
 101                         return (1);
 102         }
 103
 104         /*
 105          * !!!
 106          * If any count was supplied, it applies to the first command in the
 107          * at buffer.
 108          */
 109         if (F_ISSET(vp, VC_C1SET)) {
 110                 len = snprintf(nbuf, sizeof(nbuf), "%lu", vp->count);
 111                 CHAR2INT(sp, nbuf, len, wp, wlen);
 112                 MEMCPYW(wbuf, wp, wlen);
 113                 if (v_event_push(sp, NULL, wp, wlen, 0))
 114                         return (1);
 115         }
 116         return (0);
 117 }