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 <errno.h>
18#include <limits.h>
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22
23#include "../common/common.h"
24#include "../vi/vi.h"
25
26static int ex_N_edit(SCR *, EXCMD *, FREF *, int);
27
28/*
29 * ex_edit --	:e[dit][!] [+cmd] [file]
30 *		:ex[!] [+cmd] [file]
31 *		:vi[sual][!] [+cmd] [file]
32 *
33 * Edit a file; if none specified, re-edit the current file.  The third
34 * form of the command can only be executed while in vi mode.  See the
35 * hack in ex.c:ex_cmd().
36 *
37 * !!!
38 * Historic vi didn't permit the '+' command form without specifying
39 * a file name as well.  This seems unreasonable, so we support it
40 * regardless.
41 *
42 * PUBLIC: int ex_edit(SCR *, EXCMD *);
43 */
44int
45ex_edit(SCR *sp, EXCMD *cmdp)
46{
47	FREF *frp;
48	int attach, setalt;
49	char *np;
50	size_t nlen;
51
52	switch (cmdp->argc) {
53	case 0:
54		/*
55		 * If the name has been changed, we edit that file, not the
56		 * original name.  If the user was editing a temporary file
57		 * (or wasn't editing any file), create another one.  The
58		 * reason for not reusing temporary files is that there is
59		 * special exit processing of them, and reuse is tricky.
60		 */
61		frp = sp->frp;
62		if (sp->ep == NULL || F_ISSET(frp, FR_TMPFILE)) {
63			if ((frp = file_add(sp, NULL)) == NULL)
64				return (1);
65			attach = 0;
66		} else
67			attach = 1;
68		setalt = 0;
69		break;
70	case 1:
71		INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1,
72			 np, nlen);
73		if ((frp = file_add(sp, np)) == NULL)
74			return (1);
75		attach = 0;
76		setalt = 1;
77		set_alt_name(sp, np);
78		break;
79	default:
80		abort();
81	}
82
83	if (F_ISSET(cmdp, E_NEWSCREEN) || cmdp->cmd == &cmds[C_VSPLIT])
84		return (ex_N_edit(sp, cmdp, frp, attach));
85
86	/*
87	 * Check for modifications.
88	 *
89	 * !!!
90	 * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
91	 */
92	if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
93		return (1);
94
95	/* Switch files. */
96	if (file_init(sp, frp, NULL, (setalt ? FS_SETALT : 0) |
97	    (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0)))
98		return (1);
99
100	F_SET(sp, SC_FSWITCH);
101	return (0);
102}
103
104/*
105 * ex_N_edit --
106 *	New screen version of ex_edit.
107 */
108static int
109ex_N_edit(SCR *sp, EXCMD *cmdp, FREF *frp, int attach)
110{
111	SCR *new;
112
113	/* Get a new screen. */
114	if (screen_init(sp->gp, sp, &new))
115		return (1);
116	if ((cmdp->cmd == &cmds[C_VSPLIT] && vs_vsplit(sp, new)) ||
117	    (cmdp->cmd != &cmds[C_VSPLIT] && vs_split(sp, new, 0))) {
118		(void)screen_end(new);
119		return (1);
120	}
121
122	/* Get a backing file. */
123	if (attach) {
124		/* Copy file state, keep the screen and cursor the same. */
125		new->ep = sp->ep;
126		++new->ep->refcnt;
127
128		new->frp = frp;
129		new->frp->flags = sp->frp->flags;
130
131		new->lno = sp->lno;
132		new->cno = sp->cno;
133
134#if defined(USE_WIDECHAR) && defined(USE_ICONV)
135		/* Synchronize the iconv environments. */
136		o_set(new, O_FILEENCODING, OS_STRDUP,
137		    O_STR(sp, O_FILEENCODING), 0);
138		conv_enc(new, O_FILEENCODING, 0);
139#endif
140	} else if (file_init(new, frp, NULL,
141	    (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0))) {
142		(void)vs_discard(new, NULL);
143		(void)screen_end(new);
144		return (1);
145	}
146
147	/* Create the argument list. */
148	new->cargv = new->argv = ex_buildargv(sp, NULL, frp->name);
149
150	/* Set up the switch. */
151	sp->nextdisp = new;
152	F_SET(sp, SC_SSWITCH);
153
154	return (0);
155}
156