usr.bin/mail/edit.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)edit.c   8.1 (Berkeley) 6/6/93
  30  * $FreeBSD: src/usr.bin/mail/edit.c,v 1.2.6.4 2003/01/06 05:46:03 mikeh Exp $
  31  */
  32
  33 #include "rcv.h"
  34 #include <fcntl.h>
  35 #include "extern.h"
  36
  37 /*
  38  * Mail -- a mail program
  39  *
  40  * Perform message editing functions.
  41  */
  42
  43 /*
  44  * Edit a message list.
  45  */
  46 int
  47 editor(int *msgvec)
  48 {
  49         return (edit1(msgvec, 'e'));
  50 }
  51
  52 /*
  53  * Invoke the visual editor on a message list.
  54  */
  55 int
  56 visual(int *msgvec)
  57 {
  58         return (edit1(msgvec, 'v'));
  59 }
  60
  61 /*
  62  * Edit a message by writing the message into a funnily-named file
  63  * (which should not exist) and forking an editor on it.
  64  * We get the editor from the stuff above.
  65  */
  66 int
  67 edit1(int *msgvec, int type)
  68 {
  69         int c, i;
  70         FILE *fp;
  71         struct message *mp;
  72         off_t size;
  73
  74         /*
  75          * Deal with each message to be edited . . .
  76          */
  77         for (i = 0; i < msgCount && msgvec[i]; i++) {
  78                 sig_t sigint;
  79
  80                 if (i > 0) {
  81                         char buf[100];
  82                         char *p;
  83
  84                         printf("Edit message %d [ynq]? ", msgvec[i]);
  85                         if (fgets(buf, sizeof(buf), stdin) == 0)
  86                                 break;
  87                         for (p = buf; *p == ' ' || *p == '\t'; p++)
  88                                 ;
  89                         if (*p == 'q')
  90                                 break;
  91                         if (*p == 'n')
  92                                 continue;
  93                 }
  94                 dot = mp = &message[msgvec[i] - 1];
  95                 touch(mp);
  96                 sigint = signal(SIGINT, SIG_IGN);
  97                 fp = run_editor(setinput(mp), mp->m_size, type, readonly);
  98                 if (fp != NULL) {
  99                         fseeko(otf, (off_t)0, SEEK_END);
 100                         size = ftello(otf);
 101                         mp->m_block = blockof(size);
 102                         mp->m_offset = boffsetof(size);
 103                         mp->m_size = (long)fsize(fp);
 104                         mp->m_lines = 0;
 105                         mp->m_flag |= MODIFY;
 106                         rewind(fp);
 107                         while ((c = getc(fp)) != EOF) {
 108                                 if (c == '\n')
 109                                         mp->m_lines++;
 110                                 if (putc(c, otf) == EOF)
 111                                         break;
 112                         }
 113                         if (ferror(otf))
 114                                 warnx("/tmp");
 115                         Fclose(fp);
 116                 }
 117                 signal(SIGINT, sigint);
 118         }
 119         return (0);
 120 }
 121
 122 /*
 123  * Run an editor on the file at "fpp" of "size" bytes,
 124  * and return a new file pointer.
 125  * Signals must be handled by the caller.
 126  * "Type" is 'e' for _PATH_EX, 'v' for _PATH_VI.
 127  */
 128 FILE *
 129 run_editor(FILE *fp, off_t size, int type, int readonly)
 130 {
 131         FILE *nf = NULL;
 132         int t;
 133         time_t modtime;
 134         char *edit, tempname[PATHSIZE];
 135         struct stat statb;
 136
 137         snprintf(tempname, sizeof(tempname), "%s/mail.ReXXXXXXXXXX", tmpdir);
 138         if ((t = mkstemp(tempname)) == -1 ||
 139             (nf = Fdopen(t, "w")) == NULL) {
 140                 warn("%s", tempname);
 141                 goto out;
 142         }
 143         if (readonly && fchmod(t, 0400) == -1) {
 144                 warn("%s", tempname);
 145                 rm(tempname);
 146                 goto out;
 147         }
 148         if (size >= 0)
 149                 while (--size >= 0 && (t = getc(fp)) != EOF)
 150                         putc(t, nf);
 151         else
 152                 while ((t = getc(fp)) != EOF)
 153                         putc(t, nf);
 154         fflush(nf);
 155         if (fstat(fileno(nf), &statb) < 0)
 156                 modtime = 0;
 157         else
 158                 modtime = statb.st_mtime;
 159         if (ferror(nf)) {
 160                 Fclose(nf);
 161                 warnx("%s", tempname);
 162                 rm(tempname);
 163                 nf = NULL;
 164                 goto out;
 165         }
 166         if (Fclose(nf) < 0) {
 167                 warn("%s", tempname);
 168                 rm(tempname);
 169                 nf = NULL;
 170                 goto out;
 171         }
 172         nf = NULL;
 173         if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
 174                 edit = type == 'e' ? _PATH_EX : _PATH_VI;
 175         if (run_command(edit, 0, -1, -1, tempname, NULL, NULL) < 0) {
 176                 rm(tempname);
 177                 goto out;
 178         }
 179         /*
 180          * If in read only mode or file unchanged, just remove the editor
 181          * temporary and return.
 182          */
 183         if (readonly) {
 184                 rm(tempname);
 185                 goto out;
 186         }
 187         if (stat(tempname, &statb) < 0) {
 188                 warn("%s", tempname);
 189                 goto out;
 190         }
 191         if (modtime == statb.st_mtime) {
 192                 rm(tempname);
 193                 goto out;
 194         }
 195         /*
 196          * Now switch to new file.
 197          */
 198         if ((nf = Fopen(tempname, "a+")) == NULL) {
 199                 warn("%s", tempname);
 200                 rm(tempname);
 201                 goto out;
 202         }
 203         rm(tempname);
 204 out:
 205         return (nf);
 206 }