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      1 /*	$NetBSD: v_at.c,v 1.4 2014/01/26 21:43:45 christos Exp $ */
      2 /*-
      3  * Copyright (c) 1992, 1993, 1994
      4  *	The Regents of the University of California.  All rights reserved.
      5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
      6  *	Keith Bostic.  All rights reserved.
      7  *
      8  * See the LICENSE file for redistribution information.
      9  */
     10 
     11 #include "config.h"
     12 
     13 #include <sys/cdefs.h>
     14 #if 0
     15 #ifndef lint
     16 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 ";
     17 #endif /* not lint */
     18 #else
     19 __RCSID("$NetBSD: v_at.c,v 1.4 2014/01/26 21:43:45 christos Exp $");
     20 #endif
     21 
     22 #include <sys/types.h>
     23 #include <sys/queue.h>
     24 #include <sys/time.h>
     25 
     26 #include <bitstring.h>
     27 #include <ctype.h>
     28 #include <limits.h>
     29 #include <stdio.h>
     30 #include <string.h>
     31 
     32 #include "../common/common.h"
     33 #include "vi.h"
     34 
     35 /*
     36  * v_at -- @
     37  *	Execute a buffer.
     38  *
     39  * PUBLIC: int v_at __P((SCR *, VICMD *));
     40  */
     41 int
     42 v_at(SCR *sp, VICMD *vp)
     43 {
     44 	CB *cbp;
     45 	ARG_CHAR_T name;
     46 	TEXT *tp;
     47 	size_t len;
     48 	char nbuf[20];
     49 	CHAR_T wbuf[20];
     50 	const CHAR_T *wp;
     51 	size_t wlen;
     52 
     53 	/*
     54 	 * !!!
     55 	 * Historically, [@*]<carriage-return> and [@*][@*] executed the most
     56 	 * recently executed buffer in ex mode.  In vi mode, only @@ repeated
     57 	 * the last buffer.  We change historic practice and make @* work from
     58 	 * vi mode as well, it's simpler and more consistent.
     59 	 *
     60 	 * My intent is that *[buffer] will, in the future, pass the buffer to
     61 	 * whatever interpreter is loaded.
     62 	 */
     63 	name = F_ISSET(vp, VC_BUFFER) ? vp->buffer : '@';
     64 	if (name == '@' || name == '*') {
     65 		if (!F_ISSET(sp, SC_AT_SET)) {
     66 			ex_emsg(sp, NULL, EXM_NOPREVBUF);
     67 			return (1);
     68 		}
     69 		name = sp->at_lbuf;
     70 	}
     71 	F_SET(sp, SC_AT_SET);
     72 
     73 	CBNAME(sp, cbp, name);
     74 	if (cbp == NULL) {
     75 		ex_emsg(sp, (char *)KEY_NAME(sp, name), EXM_EMPTYBUF);
     76 		return (1);
     77 	}
     78 
     79 	/* Save for reuse. */
     80 	sp->at_lbuf = name;
     81 
     82 	/*
     83 	 * The buffer is executed in vi mode, while in vi mode, so simply
     84 	 * push it onto the terminal queue and continue.
     85 	 *
     86 	 * !!!
     87 	 * Historic practice is that if the buffer was cut in line mode,
     88 	 * <newlines> were appended to each line as it was pushed onto
     89 	 * the stack.  If the buffer was cut in character mode, <newlines>
     90 	 * were appended to all lines but the last one.
     91 	 *
     92 	 * XXX
     93 	 * Historic practice is that execution of an @ buffer could be
     94 	 * undone by a single 'u' command, i.e. the changes were grouped
     95 	 * together.  We don't get this right; I'm waiting for the new DB
     96 	 * logging code to be available.
     97 	 */
     98 	TAILQ_FOREACH_REVERSE(tp, &cbp->textq, _texth, q) {
     99 		static CHAR_T nl[] = { '\n', 0 };
    100 		if (((F_ISSET(cbp, CB_LMODE) ||
    101 		    TAILQ_NEXT(tp, q) != NULL) &&
    102 		    v_event_push(sp, NULL, nl, 1, 0)) ||
    103 		    v_event_push(sp, NULL, tp->lb, tp->len, 0))
    104 			return (1);
    105 	}
    106 
    107 	/*
    108 	 * !!!
    109 	 * If any count was supplied, it applies to the first command in the
    110 	 * at buffer.
    111 	 */
    112 	if (F_ISSET(vp, VC_C1SET)) {
    113 		len = snprintf(nbuf, sizeof(nbuf), "%lu", vp->count);
    114 		CHAR2INT(sp, nbuf, len, wp, wlen);
    115 		MEMCPYW(wbuf, wp, wlen);
    116 		if (v_event_push(sp, NULL, wp, wlen, 0))
    117 			return (1);
    118 	}
    119 	return (0);
    120 }
    121