1 /*        $NetBSD: ex_edit.c,v 1.7 2014/01/26 21:43:45 christos Exp $ */
2 /*-
3  * Copyright (c) 1992, 1993, 1994
4  *        The Regents of the University of California.  All rights reserved.
5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
6  *        Keith Bostic.  All rights reserved.
7  *
8  * See the LICENSE file for redistribution information.
9  */
10 
11 #include "config.h"
12 
13 #include <sys/cdefs.h>
14 #if 0
15 #ifndef lint
16 static const char sccsid[] = "Id: ex_edit.c,v 10.14 2001/08/28 13:29:15 skimo Exp  (Berkeley) Date: 2001/08/28 13:29:15 ";
17 #endif /* not lint */
18 #else
19 __RCSID("$NetBSD: ex_edit.c,v 1.7 2014/01/26 21:43:45 christos Exp $");
20 #endif
21 
22 #include <sys/types.h>
23 #include <sys/queue.h>
24 #include <sys/time.h>
25 
26 #include <bitstring.h>
27 #include <errno.h>
28 #include <limits.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 
33 #include "../common/common.h"
34 #include "../vi/vi.h"
35 
36 static int ex_N_edit __P((SCR *, EXCMD *, FREF *, int));
37 
38 /*
39  * ex_edit --       :e[dit][!] [+cmd] [file]
40  *                  :ex[!] [+cmd] [file]
41  *                  :vi[sual][!] [+cmd] [file]
42  *
43  * Edit a file; if none specified, re-edit the current file.  The third
44  * form of the command can only be executed while in vi mode.  See the
45  * hack in ex.c:ex_cmd().
46  *
47  * !!!
48  * Historic vi didn't permit the '+' command form without specifying
49  * a file name as well.  This seems unreasonable, so we support it
50  * regardless.
51  *
52  * PUBLIC: int ex_edit __P((SCR *, EXCMD *));
53  */
54 int
ex_edit(SCR * sp,EXCMD * cmdp)55 ex_edit(SCR *sp, EXCMD *cmdp)
56 {
57           FREF *frp;
58           int attach, setalt;
59           const char *np;
60           size_t nlen;
61 
62           switch (cmdp->argc) {
63           case 0:
64                     /*
65                      * If the name has been changed, we edit that file, not the
66                      * original name.  If the user was editing a temporary file
67                      * (or wasn't editing any file), create another one.  The
68                      * reason for not reusing temporary files is that there is
69                      * special exit processing of them, and reuse is tricky.
70                      */
71                     frp = sp->frp;
72                     if (sp->ep == NULL || F_ISSET(frp, FR_TMPFILE)) {
73                               if ((frp = file_add(sp, NULL)) == NULL)
74                                         return (1);
75                               attach = 0;
76                     } else
77                               attach = 1;
78                     setalt = 0;
79                     break;
80           case 1:
81                     INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1,
82                                np, nlen);
83                     if ((frp = file_add(sp, np)) == NULL)
84                               return (1);
85                     attach = 0;
86                     setalt = 1;
87                     set_alt_name(sp, np);
88                     break;
89           default:
90                     abort();
91           }
92 
93           if (F_ISSET(cmdp, E_NEWSCREEN) || cmdp->cmd == &cmds[C_VSPLIT])
94                     return (ex_N_edit(sp, cmdp, frp, attach));
95 
96           /*
97            * Check for modifications.
98            *
99            * !!!
100            * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
101            */
102           if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
103                     return (1);
104 
105           /* Switch files. */
106           if (file_init(sp, frp, NULL, (setalt ? FS_SETALT : 0) |
107               (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0)))
108                     return (1);
109 
110           F_SET(sp, SC_FSWITCH);
111           return (0);
112 }
113 
114 /*
115  * ex_N_edit --
116  *        New screen version of ex_edit.
117  */
118 static int
ex_N_edit(SCR * sp,EXCMD * cmdp,FREF * frp,int attach)119 ex_N_edit(SCR *sp, EXCMD *cmdp, FREF *frp, int attach)
120 {
121           SCR *new;
122 
123           /* Get a new screen. */
124           if (screen_init(sp->gp, sp, &new))
125                     return (1);
126           if ((cmdp->cmd == &cmds[C_VSPLIT] && vs_vsplit(sp, new)) ||
127               (cmdp->cmd != &cmds[C_VSPLIT] && vs_split(sp, new, 0))) {
128                     (void)screen_fini(new);
129                     return (1);
130           }
131 
132           /* Get a backing file. */
133           if (attach) {
134                     /* Copy file state, keep the screen and cursor the same. */
135                     new->ep = sp->ep;
136                     ++new->ep->refcnt;
137                     TAILQ_INSERT_HEAD(&new->ep->scrq, new, eq);
138 
139                     new->frp = frp;
140                     new->frp->flags = sp->frp->flags;
141 
142                     new->lno = sp->lno;
143                     new->cno = sp->cno;
144           } else if (file_init(new, frp, NULL,
145               (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0))) {
146                     (void)vs_discard(new, NULL);
147                     (void)screen_end(new);
148                     return (1);
149           }
150 
151           /* Create the argument list. */
152           new->cargv = new->argv = ex_buildargv(sp, NULL, frp->name);
153 
154           /* Set up the switch. */
155           sp->nextdisp = new;
156           F_SET(sp, SC_SSWITCH);
157 
158           return (0);
159 }
160