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 <stdlib.h>
21#include <string.h>
22
23#include "../common/common.h"
24
25/*
26 * ex_at -- :@[@ | buffer]
27 *	    :*[* | buffer]
28 *
29 *	Execute the contents of the buffer.
30 *
31 * PUBLIC: int ex_at(SCR *, EXCMD *);
32 */
33int
34ex_at(SCR *sp, EXCMD *cmdp)
35{
36	CB *cbp;
37	CHAR_T name;
38	EXCMD *ecp;
39	RANGE *rp;
40	TEXT *tp;
41	size_t len = 0;
42	CHAR_T *p;
43
44	/*
45	 * !!!
46	 * Historically, [@*]<carriage-return> and [@*][@*] executed the most
47	 * recently executed buffer in ex mode.
48	 */
49	name = FL_ISSET(cmdp->iflags, E_C_BUFFER) ? cmdp->buffer : '@';
50	if (name == '@' || name == '*') {
51		if (!F_ISSET(sp, SC_AT_SET)) {
52			ex_emsg(sp, NULL, EXM_NOPREVBUF);
53			return (1);
54		}
55		name = sp->at_lbuf;
56	}
57	sp->at_lbuf = name;
58	F_SET(sp, SC_AT_SET);
59
60	CBNAME(sp, cbp, name);
61	if (cbp == NULL) {
62		ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF);
63		return (1);
64	}
65
66	/*
67	 * !!!
68	 * Historically the @ command took a range of lines, and the @ buffer
69	 * was executed once per line.  The historic vi could be trashed by
70	 * this because it didn't notice if the underlying file changed, or,
71	 * for that matter, if there were no more lines on which to operate.
72	 * For example, take a 10 line file, load "%delete" into a buffer,
73	 * and enter :8,10@<buffer>.
74	 *
75	 * The solution is a bit tricky.  If the user specifies a range, take
76	 * the same approach as for global commands, and discard the command
77	 * if exit or switch to a new file/screen.  If the user doesn't specify
78	 * the  range, continue to execute after a file/screen switch, which
79	 * means @ buffers are still useful in a multi-screen environment.
80	 */
81	CALLOC_RET(sp, ecp, 1, sizeof(EXCMD));
82	TAILQ_INIT(ecp->rq);
83	CALLOC_RET(sp, rp, 1, sizeof(RANGE));
84	rp->start = cmdp->addr1.lno;
85	if (F_ISSET(cmdp, E_ADDR_DEF)) {
86		rp->stop = rp->start;
87		FL_SET(ecp->agv_flags, AGV_AT_NORANGE);
88	} else {
89		rp->stop = cmdp->addr2.lno;
90		FL_SET(ecp->agv_flags, AGV_AT);
91	}
92	TAILQ_INSERT_HEAD(ecp->rq, rp, q);
93
94	/*
95	 * Buffers executed in ex mode or from the colon command line in vi
96	 * were ex commands.  We can't push it on the terminal queue, since
97	 * it has to be executed immediately, and we may be in the middle of
98	 * an ex command already.  Push the command on the ex command stack.
99	 * Build two copies of the command.  We need two copies because the
100	 * ex parser may step on the command string when it's parsing it.
101	 */
102	TAILQ_FOREACH_REVERSE(tp, cbp->textq, _texth, q)
103		len += tp->len + 1;
104
105	MALLOC_RET(sp, ecp->cp, len * 2 * sizeof(CHAR_T));
106	ecp->o_cp = ecp->cp;
107	ecp->o_clen = len;
108	ecp->cp[len] = '\0';
109
110	/* Copy the buffer into the command space. */
111	p = ecp->cp + len;
112	TAILQ_FOREACH_REVERSE(tp, cbp->textq, _texth, q) {
113		MEMCPY(p, tp->lb, tp->len);
114		p += tp->len;
115		*p++ = '\n';
116	}
117
118	SLIST_INSERT_HEAD(sp->gp->ecq, ecp, q);
119	return (0);
120}
121