edit.c

   1 /*
   2  * S-nail - a mail user agent derived from Berkeley Mail.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 Steffen "Daode" Nurpmeso.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 #include "rcv.h"
  41 #include "extern.h"
  42 #include <sys/stat.h>
  43 #include <unistd.h>
  44
  45 /*
  46  * Mail -- a mail program
  47  *
  48  * Perform message editing functions.
  49  */
  50
  51 static int edit1(int *msgvec, int type);
  52
  53 /*
  54  * Edit a message list.
  55  */
  56 int
  57 editor(void *v)
  58 {
  59         int *msgvec = v;
  60
  61         return edit1(msgvec, 'e');
  62 }
  63
  64 /*
  65  * Invoke the visual editor on a message list.
  66  */
  67 int
  68 visual(void *v)
  69 {
  70         int *msgvec = v;
  71
  72         return edit1(msgvec, 'v');
  73 }
  74
  75 /*
  76  * Edit a message by writing the message into a funnily-named file
  77  * (which should not exist) and forking an editor on it.
  78  * We get the editor from the stuff above.
  79  */
  80 static int
  81 edit1(int *msgvec, int type)
  82 {
  83         int c, i, wb, lastnl;
  84         FILE *fp = NULL;
  85         struct message *mp;
  86         off_t size;
  87         char *line = NULL;
  88         size_t linesize;
  89
  90         /*
  91          * Deal with each message to be edited . . .
  92          */
  93         wb = value("writebackedited") != NULL;
  94         for (i = 0; msgvec[i] && i < msgCount; i++) {
  95                 sighandler_type sigint;
  96
  97                 if (i > 0) {
  98                         char *p;
  99
 100                         printf(tr(72, "Edit message %d [ynq]? "), msgvec[i]);
 101                         fflush(stdout);
 102                         if (readline(stdin, &line, &linesize) < 0)
 103                                 break;
 104                         for (p = line; blankchar(*p & 0377); p++);
 105                         if (*p == 'q')
 106                                 break;
 107                         if (*p == 'n')
 108                                 continue;
 109                 }
 110                 setdot(mp = &message[msgvec[i] - 1]);
 111                 did_print_dot = 1;
 112                 touch(mp);
 113                 sigint = safe_signal(SIGINT, SIG_IGN);
 114                 --mp->m_size; /* XXX[edithack] strip final NL */
 115                 fp = run_editor(fp, -1/*mp->m_size*/, type,
 116                                 (mb.mb_perm & MB_EDIT) == 0 || !wb,
 117                                 NULL, mp, wb ? SEND_MBOX : SEND_TODISP_ALL,
 118                                 sigint);
 119                 ++mp->m_size; /* XXX[edithack] */
 120                 if (fp != NULL) {
 121                         fseek(mb.mb_otf, 0L, SEEK_END);
 122                         size = ftell(mb.mb_otf);
 123                         mp->m_block = mailx_blockof(size);
 124                         mp->m_offset = mailx_offsetof(size);
 125                         mp->m_lines = 0;
 126                         mp->m_flag |= MODIFY;
 127                         rewind(fp);
 128                         lastnl = 0;
 129                         size = 0;
 130                         while ((c = getc(fp)) != EOF) {
 131                                 if ((lastnl = c == '\n'))
 132                                         mp->m_lines++;
 133                                 if (putc(c, mb.mb_otf) == EOF)
 134                                         break;
 135                                 ++size;
 136                         }
 137                         /* MBOX finalize XXX[edithack] is this always MBOX? */
 138                         if (! lastnl && putc('\n', mb.mb_otf) != EOF)
 139                                 ++size;
 140                         if (putc('\n', mb.mb_otf) != EOF)
 141                                 ++size;
 142                         mp->m_size = (size_t)size;/*XXX[edithack] inc.MBOX?!? */
 143                         if (ferror(mb.mb_otf))
 144                                 perror("/tmp");
 145                         Fclose(fp);
 146                 }
 147                 safe_signal(SIGINT, sigint);
 148         }
 149         if (line)
 150                 free(line);
 151         return 0;
 152 }
 153
 154 /*
 155  * Run an editor on the file at "fpp" of "size" bytes,
 156  * and return a new file pointer.
 157  * Signals must be handled by the caller.
 158  * "Type" is 'e' for ed, 'v' for vi.
 159  */
 160 FILE *
 161 run_editor(FILE *fp, off_t size, int type, int readonly,
 162                 struct header *hp, struct message *mp, enum sendaction action,
 163                 sighandler_type oldint)
 164 {
 165         FILE *nf = NULL;
 166         int t;
 167         time_t modtime;
 168         char *edit;
 169         struct stat statb;
 170         char *tempEdit;
 171         sigset_t        set;
 172
 173         if ((nf = Ftemp(&tempEdit, "Re", "w", readonly ? 0400 : 0600, 1))
 174                         == NULL) {
 175                 perror(catgets(catd, CATSET, 73, "temporary mail edit file"));
 176                 goto out;
 177         }
 178         if (hp) {
 179                 t = GTO|GSUBJECT|GCC|GBCC|GNL|GCOMMA;
 180                 if (hp->h_from || hp->h_replyto || hp->h_sender ||
 181                                 hp->h_organization)
 182                         t |= GIDENT;
 183                 puthead(hp, nf, t, SEND_TODISP, CONV_NONE, NULL, NULL);
 184         }
 185         if (mp) {
 186                 send(mp, nf, 0, NULL, action, NULL);
 187         } else {
 188                 if (size >= 0)
 189                         while (--size >= 0 && (t = getc(fp)) != EOF)
 190                                 putc(t, nf);
 191                 else
 192                         while ((t = getc(fp)) != EOF)
 193                                 putc(t, nf);
 194         }
 195         fflush(nf);
 196         if (fstat(fileno(nf), &statb) < 0)
 197                 modtime = 0;
 198         else
 199                 modtime = statb.st_mtime;
 200         if (ferror(nf)) {
 201                 Fclose(nf);
 202                 perror(tempEdit);
 203                 unlink(tempEdit);
 204                 Ftfree(&tempEdit);
 205                 nf = NULL;
 206                 goto out;
 207         }
 208         if (Fclose(nf) < 0) {
 209                 perror(tempEdit);
 210                 unlink(tempEdit);
 211                 Ftfree(&tempEdit);
 212                 nf = NULL;
 213                 goto out;
 214         }
 215         nf = NULL;
 216         if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
 217                 edit = type == 'e' ? "ed" : "vi";
 218         sigemptyset(&set);
 219         if (run_command(edit, oldint != SIG_IGN ? &set : NULL, -1, -1,
 220                                 tempEdit, NULL, NULL) < 0) {
 221                 unlink(tempEdit);
 222                 Ftfree(&tempEdit);
 223                 goto out;
 224         }
 225         /*
 226          * If in read only mode or file unchanged, just remove the editor
 227          * temporary and return.
 228          */
 229         if (readonly) {
 230                 unlink(tempEdit);
 231                 Ftfree(&tempEdit);
 232                 goto out;
 233         }
 234         if (stat(tempEdit, &statb) < 0) {
 235                 perror(tempEdit);
 236                 Ftfree(&tempEdit);
 237                 goto out;
 238         }
 239         if (modtime == statb.st_mtime) {
 240                 unlink(tempEdit);
 241                 Ftfree(&tempEdit);
 242                 goto out;
 243         }
 244         /*
 245          * Now switch to new file.
 246          */
 247         if ((nf = Fopen(tempEdit, "a+")) == NULL)
 248                 perror(tempEdit);
 249 out:
 250         if (tempEdit) {
 251                 unlink(tempEdit);
 252                 Ftfree(&tempEdit);
 253         }
 254         return nf;
 255 }