edit.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Perform message editing functions.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2013 Steffen "Daode" Nurpmeso <sdaoden@users.sf.net>.
   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
  42 #include <sys/stat.h>
  43 #include <unistd.h>
  44
  45 #include "extern.h"
  46
  47 static int edit1(int *msgvec, int type);
  48
  49 /*
  50  * Edit a message list.
  51  */
  52 int
  53 editor(void *v)
  54 {
  55         int *msgvec = v;
  56
  57         return edit1(msgvec, 'e');
  58 }
  59
  60 /*
  61  * Invoke the visual editor on a message list.
  62  */
  63 int
  64 visual(void *v)
  65 {
  66         int *msgvec = v;
  67
  68         return edit1(msgvec, 'v');
  69 }
  70
  71 /*
  72  * Edit a message by writing the message into a funnily-named file
  73  * (which should not exist) and forking an editor on it.
  74  * We get the editor from the stuff above.
  75  */
  76 static int
  77 edit1(int *msgvec, int type)
  78 {
  79         int c, i, wb, lastnl;
  80         FILE *fp = NULL;
  81         struct message *mp;
  82         off_t size;
  83         char *line = NULL;
  84         size_t linesize;
  85
  86         /*
  87          * Deal with each message to be edited . . .
  88          */
  89         wb = value("writebackedited") != NULL;
  90         for (i = 0; msgvec[i] && i < msgCount; i++) {
  91                 sighandler_type sigint;
  92
  93                 if (i > 0) {
  94                         char *p;
  95
  96                         printf(tr(72, "Edit message %d [ynq]? "), msgvec[i]);
  97                         fflush(stdout);
  98                         if (readline_restart(stdin, &line, &linesize, 0) < 0)
  99                                 break;
 100                         for (p = line; blankchar(*p); p++)
 101                                 ;
 102                         if (*p == 'q')
 103                                 break;
 104                         if (*p == 'n')
 105                                 continue;
 106                 }
 107                 setdot(mp = &message[msgvec[i] - 1]);
 108                 did_print_dot = TRU1;
 109                 touch(mp);
 110
 111                 sigint = safe_signal(SIGINT, SIG_IGN);
 112                 --mp->m_size; /* Strip final NL.. */
 113                 fp = run_editor(fp, -1/*mp->m_size*/, type,
 114                                 (mb.mb_perm & MB_EDIT) == 0 || ! wb,
 115                                 NULL, mp, wb ? SEND_MBOX : SEND_TODISP_ALL,
 116                                 sigint);
 117                 ++mp->m_size; /* And readd it */
 118                 if (fp != NULL) {
 119                         fseek(mb.mb_otf, 0L, SEEK_END);
 120                         size = ftell(mb.mb_otf);
 121                         mp->m_block = mailx_blockof(size);
 122                         mp->m_offset = mailx_offsetof(size);
 123                         mp->m_lines = 0;
 124                         mp->m_flag |= MODIFY;
 125                         rewind(fp);
 126                         lastnl = 0;
 127                         size = 0;
 128                         while ((c = getc(fp)) != EOF) {
 129                                 if ((lastnl = c == '\n'))
 130                                         mp->m_lines++;
 131                                 if (putc(c, mb.mb_otf) == EOF)
 132                                         break;
 133                                 ++size;
 134                         }
 135                         if (! lastnl && putc('\n', mb.mb_otf) != EOF)
 136                                 ++size;
 137                         if (putc('\n', mb.mb_otf) != EOF)
 138                                 ++size;
 139                         mp->m_size = (size_t)size;
 140                         if (ferror(mb.mb_otf))
 141                                 perror("/tmp");
 142                         Fclose(fp);
 143                 }
 144                 safe_signal(SIGINT, sigint);
 145         }
 146         if (line)
 147                 free(line);
 148         return 0;
 149 }
 150
 151 /*
 152  * Run an editor on the file at "fpp" of "size" bytes,
 153  * and return a new file pointer.
 154  * Signals must be handled by the caller.
 155  * "Type" is 'e' for ed, 'v' for vi.
 156  */
 157 FILE *
 158 run_editor(FILE *fp, off_t size, int type, int readonly,
 159                 struct header *hp, struct message *mp, enum sendaction action,
 160                 sighandler_type oldint)
 161 {
 162         FILE *nf = NULL;
 163         int t;
 164         time_t modtime;
 165         char const *editor;
 166         struct stat statb;
 167         char *tempEdit;
 168         sigset_t set;
 169
 170         if ((nf = Ftemp(&tempEdit, "Re", "w", readonly ? 0400 : 0600, 1))
 171                         == NULL) {
 172                 perror(catgets(catd, CATSET, 73, "temporary mail edit file"));
 173                 goto out;
 174         }
 175         if (hp) {
 176                 t = GTO|GSUBJECT|GCC|GBCC|GNL|GCOMMA;
 177                 if (hp->h_from || hp->h_replyto || hp->h_sender ||
 178                                 hp->h_organization)
 179                         t |= GIDENT;
 180                 puthead(hp, nf, t, SEND_TODISP, CONV_NONE, NULL, NULL);
 181         }
 182         if (mp) {
 183                 send(mp, nf, 0, NULL, action, NULL);
 184         } else {
 185                 if (size >= 0)
 186                         while (--size >= 0 && (t = getc(fp)) != EOF)
 187                                 putc(t, nf);
 188                 else
 189                         while ((t = getc(fp)) != EOF)
 190                                 putc(t, nf);
 191         }
 192         fflush(nf);
 193         if (fstat(fileno(nf), &statb) < 0)
 194                 modtime = 0;
 195         else
 196                 modtime = statb.st_mtime;
 197         if (ferror(nf)) {
 198                 Fclose(nf);
 199                 perror(tempEdit);
 200                 nf = NULL;
 201                 goto out;
 202         }
 203         if (Fclose(nf) < 0) {
 204                 perror(tempEdit);
 205                 nf = NULL;
 206                 goto out;
 207         }
 208         nf = NULL;
 209
 210         if ((editor = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
 211                 editor = (type == 'e') ? "ed" : "vi";
 212         sigemptyset(&set);
 213         if (run_command(editor, oldint != SIG_IGN ? &set : NULL, -1, -1,
 214                                 tempEdit, NULL, NULL) < 0)
 215                 goto out;
 216
 217         /*
 218          * If in read only mode or file unchanged, just remove the editor
 219          * temporary and return.  Otherwise switch to new file.
 220          */
 221         if (readonly)
 222                 goto out;
 223         if (stat(tempEdit, &statb) < 0) {
 224                 perror(tempEdit);
 225                 Ftfree(&tempEdit);
 226                 goto out;
 227         }
 228         if (modtime != statb.st_mtime && (nf = Fopen(tempEdit, "a+")) == NULL)
 229                 perror(tempEdit);
 230 out:
 231         if (tempEdit != NULL) {
 232                 unlink(tempEdit);
 233                 Ftfree(&tempEdit);
 234         }
 235         return nf;
 236 }