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
13static const char sccsid[] = "$Id: v_at.c,v 10.11 2001/06/25 15:19:30 skimo Exp $";
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 */
35int
36v_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	TAILQ_FOREACH_REVERSE(tp, cbp->textq, _texth, q) {
93		if (((F_ISSET(cbp, CB_LMODE) ||
94		    TAILQ_NEXT(tp, q) != NULL) &&
95		    v_event_push(sp, NULL, L("\n"), 1, 0)) ||
96		    v_event_push(sp, NULL, tp->lb, tp->len, 0))
97			return (1);
98	}
99
100	/*
101	 * !!!
102	 * If any count was supplied, it applies to the first command in the
103	 * at buffer.
104	 */
105	if (F_ISSET(vp, VC_C1SET)) {
106		len = snprintf(nbuf, sizeof(nbuf), "%lu", vp->count);
107		CHAR2INT(sp, nbuf, len, wp, wlen);
108		MEMCPY(wbuf, wp, wlen);
109		if (v_event_push(sp, NULL, wp, wlen, 0))
110			return (1);
111	}
112	return (0);
113}
114