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