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v_at.c revision 1.3 
      1 /*	$NetBSD: v_at.c,v 1.3 2013/11/25 22:43:46 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 #ifndef lint
     14 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 ";
     15 #endif /* not lint */
     16 
     17 #include <sys/types.h>
     18 #include <sys/queue.h>
     19 #include <sys/time.h>
     20 
     21 #include <bitstring.h>
     22 #include <ctype.h>
     23 #include <limits.h>
     24 #include <stdio.h>
     25 #include <string.h>
     26 
     27 #include "../common/common.h"
     28 #include "vi.h"
     29 
     30 /*
     31  * v_at -- @
     32  *	Execute a buffer.
     33  *
     34  * PUBLIC: int v_at __P((SCR *, VICMD *));
     35  */
     36 int
     37 v_at(SCR *sp, VICMD *vp)
     38 {
     39 	CB *cbp;
     40 	ARG_CHAR_T name;
     41 	TEXT *tp;
     42 	size_t len;
     43 	char nbuf[20];
     44 	CHAR_T wbuf[20];
     45 	const 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, (char *)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 	TAILQ_FOREACH_REVERSE(tp, &cbp->textq, _texth, q) {
     94 		static CHAR_T nl[] = { '\n', 0 };
     95 		if (((F_ISSET(cbp, CB_LMODE) ||
     96 		    TAILQ_NEXT(tp, q) != NULL) &&
     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 }
    116