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
13 static const char sccsid[] = "@(#)ex_edit.c 10.10 (Berkeley) 4/27/96";
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 <errno.h>
22 #include <limits.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include "../common/common.h"
28 #include "../vi/vi.h"
29
30 static int ex_N_edit __P((SCR *, EXCMD *, FREF *, int));
31
32 /*
33 * ex_edit -- :e[dit][!] [+cmd] [file]
34 * :ex[!] [+cmd] [file]
35 * :vi[sual][!] [+cmd] [file]
36 *
37 * Edit a file; if none specified, re-edit the current file. The third
38 * form of the command can only be executed while in vi mode. See the
39 * hack in ex.c:ex_cmd().
40 *
41 * !!!
42 * Historic vi didn't permit the '+' command form without specifying
43 * a file name as well. This seems unreasonable, so we support it
44 * regardless.
45 *
46 * PUBLIC: int ex_edit __P((SCR *, EXCMD *));
47 */
48 int
ex_edit(sp,cmdp)49 ex_edit(sp, cmdp)
50 SCR *sp;
51 EXCMD *cmdp;
52 {
53 FREF *frp;
54 int attach, setalt;
55
56 switch (cmdp->argc) {
57 case 0:
58 /*
59 * If the name has been changed, we edit that file, not the
60 * original name. If the user was editing a temporary file
61 * (or wasn't editing any file), create another one. The
62 * reason for not reusing temporary files is that there is
63 * special exit processing of them, and reuse is tricky.
64 */
65 frp = sp->frp;
66 if (sp->ep == NULL || F_ISSET(frp, FR_TMPFILE)) {
67 if ((frp = file_add(sp, NULL)) == NULL)
68 return (1);
69 attach = 0;
70 } else
71 attach = 1;
72 setalt = 0;
73 break;
74 case 1:
75 if ((frp = file_add(sp, cmdp->argv[0]->bp)) == NULL)
76 return (1);
77 attach = 0;
78 setalt = 1;
79 set_alt_name(sp, cmdp->argv[0]->bp);
80 break;
81 default:
82 abort();
83 }
84
85 if (F_ISSET(cmdp, E_NEWSCREEN))
86 return (ex_N_edit(sp, cmdp, frp, attach));
87
88 /*
89 * Check for modifications.
90 *
91 * !!!
92 * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
93 */
94 if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
95 return (1);
96
97 /* Switch files. */
98 if (file_init(sp, frp, NULL, (setalt ? FS_SETALT : 0) |
99 (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0)))
100 return (1);
101
102 F_SET(sp, SC_FSWITCH);
103 return (0);
104 }
105
106 /*
107 * ex_N_edit --
108 * New screen version of ex_edit.
109 */
110 static int
ex_N_edit(sp,cmdp,frp,attach)111 ex_N_edit(sp, cmdp, frp, attach)
112 SCR *sp;
113 EXCMD *cmdp;
114 FREF *frp;
115 int attach;
116 {
117 SCR *new;
118
119 /* Get a new screen. */
120 if (screen_init(sp->gp, sp, &new))
121 return (1);
122 if (vs_split(sp, new, 0)) {
123 (void)screen_end(new);
124 return (1);
125 }
126
127 /* Get a backing file. */
128 if (attach) {
129 /* Copy file state, keep the screen and cursor the same. */
130 new->ep = sp->ep;
131 ++new->ep->refcnt;
132
133 new->frp = frp;
134 new->frp->flags = sp->frp->flags;
135
136 new->lno = sp->lno;
137 new->cno = sp->cno;
138 } else if (file_init(new, frp, NULL,
139 (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0))) {
140 (void)vs_discard(new, NULL);
141 (void)screen_end(new);
142 return (1);
143 }
144
145 /* Create the argument list. */
146 new->cargv = new->argv = ex_buildargv(sp, NULL, frp->name);
147
148 /* Set up the switch. */
149 sp->nextdisp = new;
150 F_SET(sp, SC_SSWITCH);
151
152 return (0);
153 }
154