edit.c

   1 /*
   2  * Heirloom mailx - a mail user agent derived from Berkeley Mail.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  */
   6 /*
   7  * Copyright (c) 1980, 1993
   8  *      The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #ifndef lint
  40 #ifdef  DOSCCS
  41 static char sccsid[] = "@(#)edit.c      2.24 (gritter) 3/4/06";
  42 #endif
  43 #endif /* not lint */
  44
  45 #include "rcv.h"
  46 #include "extern.h"
  47 #include <sys/stat.h>
  48 #include <unistd.h>
  49
  50 /*
  51  * Mail -- a mail program
  52  *
  53  * Perform message editing functions.
  54  */
  55
  56 static int edit1(int *msgvec, int type);
  57
  58 /*
  59  * Edit a message list.
  60  */
  61 int
  62 editor(void *v)
  63 {
  64         int *msgvec = v;
  65
  66         return edit1(msgvec, 'e');
  67 }
  68
  69 /*
  70  * Invoke the visual editor on a message list.
  71  */
  72 int
  73 visual(void *v)
  74 {
  75         int *msgvec = v;
  76
  77         return edit1(msgvec, 'v');
  78 }
  79
  80 /*
  81  * Edit a message by writing the message into a funnily-named file
  82  * (which should not exist) and forking an editor on it.
  83  * We get the editor from the stuff above.
  84  */
  85 static int
  86 edit1(int *msgvec, int type)
  87 {
  88         int c;
  89         int i;
  90         FILE *fp = NULL;
  91         struct message *mp;
  92         off_t size;
  93         char *line = NULL;
  94         size_t linesize;
  95         int     wb;
  96
  97         /*
  98          * Deal with each message to be edited . . .
  99          */
 100         wb = value("writebackedited") != NULL;
 101         for (i = 0; msgvec[i] && i < msgCount; i++) {
 102                 sighandler_type sigint;
 103
 104                 if (i > 0) {
 105                         char *p;
 106
 107                         printf(catgets(catd, CATSET, 72,
 108                                         "Edit message %d [ynq]? "), msgvec[i]);
 109                         fflush(stdout);
 110                         if (readline(stdin, &line, &linesize) < 0)
 111                                 break;
 112                         for (p = line; blankchar(*p & 0377); p++);
 113                         if (*p == 'q')
 114                                 break;
 115                         if (*p == 'n')
 116                                 continue;
 117                 }
 118                 setdot(mp = &message[msgvec[i] - 1]);
 119                 did_print_dot = 1;
 120                 touch(mp);
 121                 sigint = safe_signal(SIGINT, SIG_IGN);
 122                 fp = run_editor(fp, mp->m_size, type,
 123                                 (mb.mb_perm & MB_EDIT) == 0 || !wb,
 124                                 NULL, mp, wb ? SEND_MBOX : SEND_TODISP_ALL,
 125                                 sigint);
 126                 if (fp != NULL) {
 127                         fseek(mb.mb_otf, 0L, SEEK_END);
 128                         size = ftell(mb.mb_otf);
 129                         mp->m_block = mailx_blockof(size);
 130                         mp->m_offset = mailx_offsetof(size);
 131                         mp->m_size = fsize(fp);
 132                         mp->m_lines = 0;
 133                         mp->m_flag |= MODIFY;
 134                         rewind(fp);
 135                         while ((c = getc(fp)) != EOF) {
 136                                 if (c == '\n')
 137                                         mp->m_lines++;
 138                                 if (putc(c, mb.mb_otf) == EOF)
 139                                         break;
 140                         }
 141                         if (ferror(mb.mb_otf))
 142                                 perror("/tmp");
 143                         Fclose(fp);
 144                 }
 145                 safe_signal(SIGINT, sigint);
 146         }
 147         if (line)
 148                 free(line);
 149         return 0;
 150 }
 151
 152 /*
 153  * Run an editor on the file at "fpp" of "size" bytes,
 154  * and return a new file pointer.
 155  * Signals must be handled by the caller.
 156  * "Type" is 'e' for ed, 'v' for vi.
 157  */
 158 FILE *
 159 run_editor(FILE *fp, off_t size, int type, int readonly,
 160                 struct header *hp, struct message *mp, enum sendaction action,
 161                 sighandler_type oldint)
 162 {
 163         FILE *nf = NULL;
 164         int t;
 165         time_t modtime;
 166         char *edit;
 167         struct stat statb;
 168         char *tempEdit;
 169         sigset_t        set;
 170
 171         if ((nf = Ftemp(&tempEdit, "Re", "w", readonly ? 0400 : 0600, 1))
 172                         == NULL) {
 173                 perror(catgets(catd, CATSET, 73, "temporary mail edit file"));
 174                 goto out;
 175         }
 176         if (hp) {
 177                 t = GTO|GSUBJECT|GCC|GBCC|GNL|GCOMMA;
 178                 if (hp->h_from || hp->h_replyto || hp->h_sender ||
 179                                 hp->h_organization)
 180                         t |= GIDENT;
 181                 puthead(hp, nf, t, SEND_TODISP, CONV_NONE, NULL, NULL);
 182         }
 183         if (mp) {
 184                 send(mp, nf, 0, NULL, action, NULL);
 185         } else {
 186                 if (size >= 0)
 187                         while (--size >= 0 && (t = getc(fp)) != EOF)
 188                                 putc(t, nf);
 189                 else
 190                         while ((t = getc(fp)) != EOF)
 191                                 putc(t, nf);
 192         }
 193         fflush(nf);
 194         if (fstat(fileno(nf), &statb) < 0)
 195                 modtime = 0;
 196         else
 197                 modtime = statb.st_mtime;
 198         if (ferror(nf)) {
 199                 Fclose(nf);
 200                 perror(tempEdit);
 201                 unlink(tempEdit);
 202                 Ftfree(&tempEdit);
 203                 nf = NULL;
 204                 goto out;
 205         }
 206         if (Fclose(nf) < 0) {
 207                 perror(tempEdit);
 208                 unlink(tempEdit);
 209                 Ftfree(&tempEdit);
 210                 nf = NULL;
 211                 goto out;
 212         }
 213         nf = NULL;
 214         if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
 215                 edit = type == 'e' ? "ed" : "vi";
 216         sigemptyset(&set);
 217         if (run_command(edit, oldint != SIG_IGN ? &set : NULL, -1, -1,
 218                                 tempEdit, NULL, NULL) < 0) {
 219                 unlink(tempEdit);
 220                 Ftfree(&tempEdit);
 221                 goto out;
 222         }
 223         /*
 224          * If in read only mode or file unchanged, just remove the editor
 225          * temporary and return.
 226          */
 227         if (readonly) {
 228                 unlink(tempEdit);
 229                 Ftfree(&tempEdit);
 230                 goto out;
 231         }
 232         if (stat(tempEdit, &statb) < 0) {
 233                 perror(tempEdit);
 234                 Ftfree(&tempEdit);
 235                 goto out;
 236         }
 237         if (modtime == statb.st_mtime) {
 238                 unlink(tempEdit);
 239                 Ftfree(&tempEdit);
 240                 goto out;
 241         }
 242         /*
 243          * Now switch to new file.
 244          */
 245         if ((nf = Fopen(tempEdit, "a+")) == NULL)
 246                 perror(tempEdit);
 247 out:
 248         if (tempEdit) {
 249                 unlink(tempEdit);
 250                 Ftfree(&tempEdit);
 251         }
 252         return nf;
 253 }