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  * 4. 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
  30 #ifndef lint
  31 #if 0
  32 static char sccsid[] = "@(#)edit.c      8.1 (Berkeley) 6/6/93";
  33 #endif
  34 #endif /* not lint */
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  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
  55         return (edit1(msgvec, 'e'));
  56 }
  57
  58 /*
  59  * Invoke the visual editor on a message list.
  60  */
  61 int
  62 visual(int *msgvec)
  63 {
  64
  65         return (edit1(msgvec, 'v'));
  66 }
  67
  68 /*
  69  * Edit a message by writing the message into a funnily-named file
  70  * (which should not exist) and forking an editor on it.
  71  * We get the editor from the stuff above.
  72  */
  73 int
  74 edit1(int *msgvec, int type)
  75 {
  76         int c, i;
  77         FILE *fp;
  78         struct message *mp;
  79         off_t size;
  80
  81         /*
  82          * Deal with each message to be edited . . .
  83          */
  84         for (i = 0; i < msgCount && msgvec[i]; i++) {
  85                 sig_t sigint;
  86
  87                 if (i > 0) {
  88                         char buf[100];
  89                         char *p;
  90
  91                         printf("Edit message %d [ynq]? ", msgvec[i]);
  92                         if (fgets(buf, sizeof(buf), stdin) == NULL)
  93                                 break;
  94                         for (p = buf; *p == ' ' || *p == '\t'; p++)
  95                                 ;
  96                         if (*p == 'q')
  97                                 break;
  98                         if (*p == 'n')
  99                                 continue;
 100                 }
 101                 dot = mp = &message[msgvec[i] - 1];
 102                 touch(mp);
 103                 sigint = signal(SIGINT, SIG_IGN);
 104                 fp = run_editor(setinput(mp), mp->m_size, type, readonly);
 105                 if (fp != NULL) {
 106                         (void)fseeko(otf, (off_t)0, SEEK_END);
 107                         size = ftello(otf);
 108                         mp->m_block = blockof(size);
 109                         mp->m_offset = boffsetof(size);
 110                         mp->m_size = (long)fsize(fp);
 111                         mp->m_lines = 0;
 112                         mp->m_flag |= MODIFY;
 113                         rewind(fp);
 114                         while ((c = getc(fp)) != EOF) {
 115                                 if (c == '\n')
 116                                         mp->m_lines++;
 117                                 if (putc(c, otf) == EOF)
 118                                         break;
 119                         }
 120                         if (ferror(otf))
 121                                 warnx("/tmp");
 122                         (void)Fclose(fp);
 123                 }
 124                 (void)signal(SIGINT, sigint);
 125         }
 126         return (0);
 127 }
 128
 129 /*
 130  * Run an editor on the file at "fpp" of "size" bytes,
 131  * and return a new file pointer.
 132  * Signals must be handled by the caller.
 133  * "Type" is 'e' for _PATH_EX, 'v' for _PATH_VI.
 134  */
 135 FILE *
 136 run_editor(FILE *fp, off_t size, int type, int readonly)
 137 {
 138         FILE *nf = NULL;
 139         int t;
 140         time_t modtime;
 141         char *edit, tempname[PATHSIZE];
 142         struct stat statb;
 143
 144         (void)snprintf(tempname, sizeof(tempname),
 145             "%s/mail.ReXXXXXXXXXX", tmpdir);
 146         if ((t = mkstemp(tempname)) == -1 ||
 147             (nf = Fdopen(t, "w")) == NULL) {
 148                 warn("%s", tempname);
 149                 goto out;
 150         }
 151         if (readonly && fchmod(t, 0400) == -1) {
 152                 warn("%s", tempname);
 153                 (void)rm(tempname);
 154                 goto out;
 155         }
 156         if (size >= 0)
 157                 while (--size >= 0 && (t = getc(fp)) != EOF)
 158                         (void)putc(t, nf);
 159         else
 160                 while ((t = getc(fp)) != EOF)
 161                         (void)putc(t, nf);
 162         (void)fflush(nf);
 163         if (fstat(fileno(nf), &statb) < 0)
 164                 modtime = 0;
 165         else
 166                 modtime = statb.st_mtime;
 167         if (ferror(nf)) {
 168                 (void)Fclose(nf);
 169                 warnx("%s", tempname);
 170                 (void)rm(tempname);
 171                 nf = NULL;
 172                 goto out;
 173         }
 174         if (Fclose(nf) < 0) {
 175                 warn("%s", tempname);
 176                 (void)rm(tempname);
 177                 nf = NULL;
 178                 goto out;
 179         }
 180         nf = NULL;
 181         if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
 182                 edit = type == 'e' ? _PATH_EX : _PATH_VI;
 183         if (run_command(edit, 0, -1, -1, tempname, NULL, NULL) < 0) {
 184                 (void)rm(tempname);
 185                 goto out;
 186         }
 187         /*
 188          * If in read only mode or file unchanged, just remove the editor
 189          * temporary and return.
 190          */
 191         if (readonly) {
 192                 (void)rm(tempname);
 193                 goto out;
 194         }
 195         if (stat(tempname, &statb) < 0) {
 196                 warn("%s", tempname);
 197                 goto out;
 198         }
 199         if (modtime == statb.st_mtime) {
 200                 (void)rm(tempname);
 201                 goto out;
 202         }
 203         /*
 204          * Now switch to new file.
 205          */
 206         if ((nf = Fopen(tempname, "a+")) == NULL) {
 207                 warn("%s", tempname);
 208                 (void)rm(tempname);
 209                 goto out;
 210         }
 211         (void)rm(tempname);
 212 out:
 213         return (nf);
 214 }