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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)edit.c   8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/mail/edit.c,v 1.2.6.4 2003/01/06 05:46:03 mikeh Exp $
  35  * $DragonFly: src/usr.bin/mail/edit.c,v 1.4 2004/09/08 03:01:11 joerg Exp $
  36  */
  37
  38 #include "rcv.h"
  39 #include <fcntl.h>
  40 #include "extern.h"
  41
  42 /*
  43  * Mail -- a mail program
  44  *
  45  * Perform message editing functions.
  46  */
  47
  48 /*
  49  * Edit a message list.
  50  */
  51 int
  52 editor(int *msgvec)
  53 {
  54         return (edit1(msgvec, 'e'));
  55 }
  56
  57 /*
  58  * Invoke the visual editor on a message list.
  59  */
  60 int
  61 visual(int *msgvec)
  62 {
  63         return (edit1(msgvec, 'v'));
  64 }
  65
  66 /*
  67  * Edit a message by writing the message into a funnily-named file
  68  * (which should not exist) and forking an editor on it.
  69  * We get the editor from the stuff above.
  70  */
  71 int
  72 edit1(int *msgvec, int type)
  73 {
  74         int c, i;
  75         FILE *fp;
  76         struct message *mp;
  77         off_t size;
  78
  79         /*
  80          * Deal with each message to be edited . . .
  81          */
  82         for (i = 0; msgvec[i] && i < msgCount; i++) {
  83                 sig_t sigint;
  84
  85                 if (i > 0) {
  86                         char buf[100];
  87                         char *p;
  88
  89                         printf("Edit message %d [ynq]? ", msgvec[i]);
  90                         if (fgets(buf, sizeof(buf), stdin) == 0)
  91                                 break;
  92                         for (p = buf; *p == ' ' || *p == '\t'; p++)
  93                                 ;
  94                         if (*p == 'q')
  95                                 break;
  96                         if (*p == 'n')
  97                                 continue;
  98                 }
  99                 dot = mp = &message[msgvec[i] - 1];
 100                 touch(mp);
 101                 sigint = signal(SIGINT, SIG_IGN);
 102                 fp = run_editor(setinput(mp), mp->m_size, type, readonly);
 103                 if (fp != NULL) {
 104                         fseeko(otf, (off_t)0, SEEK_END);
 105                         size = ftello(otf);
 106                         mp->m_block = blockof(size);
 107                         mp->m_offset = boffsetof(size);
 108                         mp->m_size = (long)fsize(fp);
 109                         mp->m_lines = 0;
 110                         mp->m_flag |= MODIFY;
 111                         rewind(fp);
 112                         while ((c = getc(fp)) != EOF) {
 113                                 if (c == '\n')
 114                                         mp->m_lines++;
 115                                 if (putc(c, otf) == EOF)
 116                                         break;
 117                         }
 118                         if (ferror(otf))
 119                                 warnx("/tmp");
 120                         Fclose(fp);
 121                 }
 122                 signal(SIGINT, sigint);
 123         }
 124         return (0);
 125 }
 126
 127 /*
 128  * Run an editor on the file at "fpp" of "size" bytes,
 129  * and return a new file pointer.
 130  * Signals must be handled by the caller.
 131  * "Type" is 'e' for _PATH_EX, 'v' for _PATH_VI.
 132  */
 133 FILE *
 134 run_editor(FILE *fp, off_t size, int type, int readonly)
 135 {
 136         FILE *nf = NULL;
 137         int t;
 138         time_t modtime;
 139         char *edit, tempname[PATHSIZE];
 140         struct stat statb;
 141
 142         snprintf(tempname, sizeof(tempname), "%s/mail.ReXXXXXXXXXX", tmpdir);
 143         if ((t = mkstemp(tempname)) == -1 ||
 144             (nf = Fdopen(t, "w")) == NULL) {
 145                 warn("%s", tempname);
 146                 goto out;
 147         }
 148         if (readonly && fchmod(t, 0400) == -1) {
 149                 warn("%s", tempname);
 150                 rm(tempname);
 151                 goto out;
 152         }
 153         if (size >= 0)
 154                 while (--size >= 0 && (t = getc(fp)) != EOF)
 155                         putc(t, nf);
 156         else
 157                 while ((t = getc(fp)) != EOF)
 158                         putc(t, nf);
 159         fflush(nf);
 160         if (fstat(fileno(nf), &statb) < 0)
 161                 modtime = 0;
 162         else
 163                 modtime = statb.st_mtime;
 164         if (ferror(nf)) {
 165                 Fclose(nf);
 166                 warnx("%s", tempname);
 167                 rm(tempname);
 168                 nf = NULL;
 169                 goto out;
 170         }
 171         if (Fclose(nf) < 0) {
 172                 warn("%s", tempname);
 173                 rm(tempname);
 174                 nf = NULL;
 175                 goto out;
 176         }
 177         nf = NULL;
 178         if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
 179                 edit = type == 'e' ? _PATH_EX : _PATH_VI;
 180         if (run_command(edit, 0, -1, -1, tempname, NULL, NULL) < 0) {
 181                 rm(tempname);
 182                 goto out;
 183         }
 184         /*
 185          * If in read only mode or file unchanged, just remove the editor
 186          * temporary and return.
 187          */
 188         if (readonly) {
 189                 rm(tempname);
 190                 goto out;
 191         }
 192         if (stat(tempname, &statb) < 0) {
 193                 warn("%s", tempname);
 194                 goto out;
 195         }
 196         if (modtime == statb.st_mtime) {
 197                 rm(tempname);
 198                 goto out;
 199         }
 200         /*
 201          * Now switch to new file.
 202          */
 203         if ((nf = Fopen(tempname, "a+")) == NULL) {
 204                 warn("%s", tempname);
 205                 rm(tempname);
 206                 goto out;
 207         }
 208         rm(tempname);
 209 out:
 210         return (nf);
 211 }