mail_cmds/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
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)edit.c      8.1 (Berkeley) 6/6/93";
  37 #endif
  38 static const char rcsid[] =
  39   "$FreeBSD: src/usr.bin/mail/edit.c,v 1.9 2002/06/30 05:25:06 obrien Exp $";
  40 #endif /* not lint */
  41
  42 #include <sys/cdefs.h>
  43
  44 #include "rcv.h"
  45 #include <fcntl.h>
  46 #include "extern.h"
  47
  48 /*
  49  * Mail -- a mail program
  50  *
  51  * Perform message editing functions.
  52  */
  53
  54 /*
  55  * Edit a message list.
  56  */
  57 int
  58 editor(msgvec)
  59         int *msgvec;
  60 {
  61
  62         return (edit1(msgvec, 'e'));
  63 }
  64
  65 /*
  66  * Invoke the visual editor on a message list.
  67  */
  68 int
  69 visual(msgvec)
  70         int *msgvec;
  71 {
  72
  73         return (edit1(msgvec, 'v'));
  74 }
  75
  76 /*
  77  * Edit a message by writing the message into a funnily-named file
  78  * (which should not exist) and forking an editor on it.
  79  * We get the editor from the stuff above.
  80  */
  81 int
  82 edit1(msgvec, type)
  83         int *msgvec;
  84         int type;
  85 {
  86         int c, i;
  87         FILE *fp;
  88         struct message *mp;
  89         off_t size;
  90
  91         /*
  92          * Deal with each message to be edited . . .
  93          */
  94         for (i = 0; msgvec[i] && i < msgCount; i++) {
  95                 sig_t sigint;
  96
  97                 if (i > 0) {
  98                         char buf[100];
  99                         char *p;
 100
 101                         printf("Edit message %d [ynq]? ", msgvec[i]);
 102                         if (fgets(buf, sizeof(buf), stdin) == 0)
 103                                 break;
 104                         for (p = buf; *p == ' ' || *p == '\t'; p++)
 105                                 ;
 106                         if (*p == 'q')
 107                                 break;
 108                         if (*p == 'n')
 109                                 continue;
 110                 }
 111                 dot = mp = &message[msgvec[i] - 1];
 112                 touch(mp);
 113                 sigint = signal(SIGINT, SIG_IGN);
 114                 fp = run_editor(setinput(mp), mp->m_size, type, readonly);
 115                 if (fp != NULL) {
 116                         (void)fseeko(otf, (off_t)0, SEEK_END);
 117                         size = ftello(otf);
 118                         mp->m_block = blockof(size);
 119                         mp->m_offset = boffsetof(size);
 120                         mp->m_size = (long)fsize(fp);
 121                         mp->m_lines = 0;
 122                         mp->m_flag |= MODIFY;
 123                         rewind(fp);
 124                         while ((c = getc(fp)) != EOF) {
 125                                 if (c == '\n')
 126                                         mp->m_lines++;
 127                                 if (putc(c, otf) == EOF)
 128                                         break;
 129                         }
 130                         if (ferror(otf))
 131                                 warnx("/tmp");
 132                         (void)Fclose(fp);
 133                 }
 134                 (void)signal(SIGINT, sigint);
 135         }
 136         return (0);
 137 }
 138
 139 /*
 140  * Run an editor on the file at "fpp" of "size" bytes,
 141  * and return a new file pointer.
 142  * Signals must be handled by the caller.
 143  * "Type" is 'e' for _PATH_EX, 'v' for _PATH_VI.
 144  */
 145 FILE *
 146 run_editor(fp, size, type, readonly)
 147         FILE *fp;
 148         off_t size;
 149         int type, readonly;
 150 {
 151         FILE *nf = NULL;
 152         int t;
 153         time_t modtime;
 154         char *edit, tempname[PATHSIZE];
 155         struct stat statb;
 156
 157         (void)snprintf(tempname, sizeof(tempname),
 158             "%s/mail.ReXXXXXXXXXX", tmpdir);
 159         if ((t = mkstemp(tempname)) == -1 ||
 160             (nf = Fdopen(t, "w")) == NULL) {
 161                 warn("%s", tempname);
 162                 goto out;
 163         }
 164         if (readonly && fchmod(t, 0400) == -1) {
 165                 warn("%s", tempname);
 166                 (void)rm(tempname);
 167                 goto out;
 168         }
 169         if (size >= 0)
 170                 while (--size >= 0 && (t = getc(fp)) != EOF)
 171                         (void)putc(t, nf);
 172         else
 173                 while ((t = getc(fp)) != EOF)
 174                         (void)putc(t, nf);
 175         (void)fflush(nf);
 176         if (fstat(fileno(nf), &statb) < 0)
 177                 modtime = 0;
 178         else
 179                 modtime = statb.st_mtime;
 180         if (ferror(nf)) {
 181                 (void)Fclose(nf);
 182                 warnx("%s", tempname);
 183                 (void)rm(tempname);
 184                 nf = NULL;
 185                 goto out;
 186         }
 187         if (Fclose(nf) < 0) {
 188                 warn("%s", tempname);
 189                 (void)rm(tempname);
 190                 nf = NULL;
 191                 goto out;
 192         }
 193         nf = NULL;
 194         if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
 195                 edit = type == 'e' ? _PATH_EX : _PATH_VI;
 196         else {
 197                 if (*edit=='\0')
 198                         edit = type == 'e' ? _PATH_EX : _PATH_VI;
 199         }
 200         if (run_command(edit, 0, -1, -1, tempname, NULL, NULL) < 0) {
 201                 (void)rm(tempname);
 202                 goto out;
 203         }
 204         /*
 205          * If in read only mode or file unchanged, just remove the editor
 206          * temporary and return.
 207          */
 208         if (readonly) {
 209                 (void)rm(tempname);
 210                 goto out;
 211         }
 212         if (stat(tempname, &statb) < 0) {
 213                 warn("%s", tempname);
 214                 goto out;
 215         }
 216         if (modtime == statb.st_mtime) {
 217                 (void)rm(tempname);
 218                 goto out;
 219         }
 220         /*
 221          * Now switch to new file.
 222          */
 223         if ((nf = Fopen(tempname, "a+")) == NULL) {
 224                 warn("%s", tempname);
 225                 (void)rm(tempname);
 226                 goto out;
 227         }
 228         (void)rm(tempname);
 229 out:
 230         return (nf);
 231 }