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: ex_at.c,v 10.16 2001/06/25 15:19:14 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 <stdlib.h>
25#include <string.h>
26
27#include "../common/common.h"
28
29/*
30 * ex_at -- :@[@ | buffer]
31 *	    :*[* | buffer]
32 *
33 *	Execute the contents of the buffer.
34 *
35 * PUBLIC: int ex_at __P((SCR *, EXCMD *));
36 */
37int
38ex_at(SCR *sp, EXCMD *cmdp)
39{
40	CB *cbp;
41	CHAR_T name;
42	EXCMD *ecp;
43	RANGE *rp;
44	TEXT *tp;
45	size_t len = 0;
46	CHAR_T *p;
47
48	/*
49	 * !!!
50	 * Historically, [@*]<carriage-return> and [@*][@*] executed the most
51	 * recently executed buffer in ex mode.
52	 */
53	name = FL_ISSET(cmdp->iflags, E_C_BUFFER) ? cmdp->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	sp->at_lbuf = name;
62	F_SET(sp, SC_AT_SET);
63
64	CBNAME(sp, cbp, name);
65	if (cbp == NULL) {
66		ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF);
67		return (1);
68	}
69
70	/*
71	 * !!!
72	 * Historically the @ command took a range of lines, and the @ buffer
73	 * was executed once per line.  The historic vi could be trashed by
74	 * this because it didn't notice if the underlying file changed, or,
75	 * for that matter, if there were no more lines on which to operate.
76	 * For example, take a 10 line file, load "%delete" into a buffer,
77	 * and enter :8,10@<buffer>.
78	 *
79	 * The solution is a bit tricky.  If the user specifies a range, take
80	 * the same approach as for global commands, and discard the command
81	 * if exit or switch to a new file/screen.  If the user doesn't specify
82	 * the  range, continue to execute after a file/screen switch, which
83	 * means @ buffers are still useful in a multi-screen environment.
84	 */
85	CALLOC_RET(sp, ecp, EXCMD *, 1, sizeof(EXCMD));
86	TAILQ_INIT(ecp->rq);
87	CALLOC_RET(sp, rp, RANGE *, 1, sizeof(RANGE));
88	rp->start = cmdp->addr1.lno;
89	if (F_ISSET(cmdp, E_ADDR_DEF)) {
90		rp->stop = rp->start;
91		FL_SET(ecp->agv_flags, AGV_AT_NORANGE);
92	} else {
93		rp->stop = cmdp->addr2.lno;
94		FL_SET(ecp->agv_flags, AGV_AT);
95	}
96	TAILQ_INSERT_HEAD(ecp->rq, rp, q);
97
98	/*
99	 * Buffers executed in ex mode or from the colon command line in vi
100	 * were ex commands.  We can't push it on the terminal queue, since
101	 * it has to be executed immediately, and we may be in the middle of
102	 * an ex command already.  Push the command on the ex command stack.
103	 * Build two copies of the command.  We need two copies because the
104	 * ex parser may step on the command string when it's parsing it.
105	 */
106	TAILQ_FOREACH_REVERSE(tp, cbp->textq, _texth, q)
107		len += tp->len + 1;
108
109	MALLOC_RET(sp, ecp->cp, CHAR_T *, len * 2 * sizeof(CHAR_T));
110	ecp->o_cp = ecp->cp;
111	ecp->o_clen = len;
112	ecp->cp[len] = '\0';
113
114	/* Copy the buffer into the command space. */
115	p = ecp->cp + len;
116	TAILQ_FOREACH_REVERSE(tp, cbp->textq, _texth, q) {
117		MEMCPY(p, tp->lb, tp->len);
118		p += tp->len;
119		*p++ = '\n';
120	}
121
122	SLIST_INSERT_HEAD(sp->gp->ecq, ecp, q);
123	return (0);
124}
125