edit.c revision 1.22 
1/*	$NetBSD: edit.c,v 1.22 2007/08/22 03:42:06 dogcow Exp $	*/
2
3/*
4 * Copyright (c) 1980, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)edit.c	8.1 (Berkeley) 6/6/93";
36#else
37__RCSID("$NetBSD: edit.c,v 1.22 2007/08/22 03:42:06 dogcow Exp $");
38#endif
39#endif /* not lint */
40
41#include "rcv.h"
42#include "extern.h"
43#include "thread.h"
44
45/*
46 * Mail -- a mail program
47 *
48 * Perform message editing functions.
49 */
50
51/*
52 * Run an editor on the file at "fpp" of "size" bytes,
53 * and return a new file pointer.
54 * Signals must be handled by the caller.
55 * "Editortype" is 'e' for _PATH_EX, 'v' for _PATH_VI.
56 */
57PUBLIC FILE *
58run_editor(FILE *fp, off_t size, int editortype, int readonlyflag)
59{
60	FILE *nf = NULL;
61	int t;
62	time_t modtime;
63	const char *editcmd;
64	char tempname[PATHSIZE];
65	struct stat statb;
66
67	(void)snprintf(tempname, sizeof(tempname),
68	    "%s/mail.ReXXXXXXXXXX", tmpdir);
69	if ((t = mkstemp(tempname)) == -1) {
70		warn("%s", tempname);
71		goto out;
72	}
73	if (readonlyflag && fchmod(t, 0400) == -1) {
74		(void)close(t);
75		warn("%s", tempname);
76		(void)unlink(tempname);
77		goto out;
78	}
79	if ((nf = Fdopen(t, "w")) == NULL) {
80		(void)close(t);
81		warn("%s", tempname);
82		(void)unlink(tempname);
83		goto out;
84	}
85	if (size >= 0)
86		while (--size >= 0 && (t = getc(fp)) != EOF)
87			(void)putc(t, nf);
88	else
89		while ((t = getc(fp)) != EOF)
90			(void)putc(t, nf);
91	(void)fflush(nf);
92	if (ferror(nf)) {
93		(void)Fclose(nf);
94		warn("%s", tempname);
95		(void)unlink(tempname);
96		nf = NULL;
97		goto out;
98	}
99	if (fstat(fileno(nf), &statb) < 0)
100		modtime = 0;
101	else
102		modtime = statb.st_mtime;
103	if (Fclose(nf) < 0) {
104		warn("%s", tempname);
105		(void)unlink(tempname);
106		nf = NULL;
107		goto out;
108	}
109	nf = NULL;
110	if ((editcmd =
111	         value(editortype == 'e' ? ENAME_EDITOR : ENAME_VISUAL)) == NULL)
112		editcmd = editortype == 'e' ? _PATH_EX : _PATH_VI;
113	if (run_command(editcmd, 0, 0, -1, tempname, NULL) < 0) {
114		(void)unlink(tempname);
115		goto out;
116	}
117	/*
118	 * If in read only mode or file unchanged, just remove the editor
119	 * temporary and return.
120	 */
121	if (readonlyflag) {
122		(void)unlink(tempname);
123		goto out;
124	}
125	if (stat(tempname, &statb) < 0) {
126		warn("%s", tempname);
127		goto out;
128	}
129	if (modtime == statb.st_mtime) {
130		(void)unlink(tempname);
131		goto out;
132	}
133	/*
134	 * Now switch to new file.
135	 */
136	if ((nf = Fopen(tempname, "a+")) == NULL) {
137		warn("%s", tempname);
138		(void)unlink(tempname);
139		goto out;
140	}
141	(void)unlink(tempname);
142out:
143	return nf;
144}
145
146/*
147 * Edit a message by writing the message into a funnily-named file
148 * (which should not exist) and forking an editor on it.
149 * We get the editor from the stuff above.
150 */
151static int
152edit1(int *msgvec, int editortype)
153{
154	int c;
155	int i;
156	int msgCount;
157	FILE *fp;
158	struct message *mp;
159	off_t size;
160
161	/*
162	 * Deal with each message to be edited . . .
163	 */
164	msgCount = get_msgCount();
165	for (i = 0; msgvec[i] && i < msgCount; i++) {
166		sig_t sigint;
167
168		if (i > 0) {
169			char buf[100];
170			char *p;
171
172			(void)printf("Edit message %d [ynq]? ", msgvec[i]);
173			if (fgets(buf, sizeof buf, stdin) == 0)
174				break;
175			for (p = buf; *p == ' ' || *p == '\t'; p++)
176				continue;
177			if (*p == 'q')
178				break;
179			if (*p == 'n')
180				continue;
181		}
182		dot = mp = get_message(msgvec[i]);
183		touch(mp);
184		sigint = signal(SIGINT, SIG_IGN);
185		fp = run_editor(setinput(mp), mp->m_size, editortype,
186				readonly);
187		if (fp != NULL) {
188			(void)fseek(otf, 0L, 2);
189			size = ftell(otf);
190			mp->m_block = blockof(size);
191			mp->m_offset = blkoffsetof(size);
192			mp->m_size = fsize(fp);
193			mp->m_lines = 0;
194			mp->m_blines = 0;
195			mp->m_flag |= MMODIFY;
196			rewind(fp);
197			while ((c = getc(fp)) != EOF) {
198				/*
199				 * XXX. if you edit a message, we treat
200				 * header lines as body lines in the recount.
201				 * This is because the original message copy
202				 * and the edit reread use different code to
203				 * count the lines, and this one here is
204				 * simple-minded.
205				 */
206				if (c == '\n') {
207					mp->m_lines++;
208					mp->m_blines++;
209				}
210				if (putc(c, otf) == EOF)
211					break;
212			}
213			if (ferror(otf))
214				warn("/tmp");
215			(void)Fclose(fp);
216		}
217		(void)signal(SIGINT, sigint);
218	}
219	return 0;
220}
221
222/*
223 * Edit a message list.
224 */
225PUBLIC int
226editor(void *v)
227{
228	int *msgvec = v;
229
230	return edit1(msgvec, 'e');
231}
232
233/*
234 * Invoke the visual editor on a message list.
235 */
236PUBLIC int
237visual(void *v)
238{
239	int *msgvec = v;
240
241	return edit1(msgvec, 'v');
242}
243