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;
  84         int i;
  85         FILE *fp = NULL;
  86         struct message *mp;
  87         off_t size;
  88         char *line = NULL;
  89         size_t linesize;
  90         int     wb;
  91
  92         /*
  93          * Deal with each message to be edited . . .
  94          */
  95         wb = value("writebackedited") != NULL;
  96         for (i = 0; msgvec[i] && i < msgCount; i++) {
  97                 sighandler_type sigint;
  98
  99                 if (i > 0) {
 100                         char *p;
 101
 102                         printf(catgets(catd, CATSET, 72,
 103                                         "Edit message %d [ynq]? "), msgvec[i]);
 104                         fflush(stdout);
 105                         if (readline(stdin, &line, &linesize) < 0)
 106                                 break;
 107                         for (p = line; blankchar(*p & 0377); p++);
 108                         if (*p == 'q')
 109                                 break;
 110                         if (*p == 'n')
 111                                 continue;
 112                 }
 113                 setdot(mp = &message[msgvec[i] - 1]);
 114                 did_print_dot = 1;
 115                 touch(mp);
 116                 sigint = safe_signal(SIGINT, SIG_IGN);
 117                 fp = run_editor(fp, mp->m_size, type,
 118                                 (mb.mb_perm & MB_EDIT) == 0 || !wb,
 119                                 NULL, mp, wb ? SEND_MBOX : SEND_TODISP_ALL,
 120                                 sigint);
 121                 if (fp != NULL) {
 122                         fseek(mb.mb_otf, 0L, SEEK_END);
 123                         size = ftell(mb.mb_otf);
 124                         mp->m_block = mailx_blockof(size);
 125                         mp->m_offset = mailx_offsetof(size);
 126                         mp->m_size = fsize(fp);
 127                         mp->m_lines = 0;
 128                         mp->m_flag |= MODIFY;
 129                         rewind(fp);
 130                         while ((c = getc(fp)) != EOF) {
 131                                 if (c == '\n')
 132                                         mp->m_lines++;
 133                                 if (putc(c, mb.mb_otf) == EOF)
 134                                         break;
 135                         }
 136                         if (ferror(mb.mb_otf))
 137                                 perror("/tmp");
 138                         Fclose(fp);
 139                 }
 140                 safe_signal(SIGINT, sigint);
 141         }
 142         if (line)
 143                 free(line);
 144         return 0;
 145 }
 146
 147 /*
 148  * Run an editor on the file at "fpp" of "size" bytes,
 149  * and return a new file pointer.
 150  * Signals must be handled by the caller.
 151  * "Type" is 'e' for ed, 'v' for vi.
 152  */
 153 FILE *
 154 run_editor(FILE *fp, off_t size, int type, int readonly,
 155                 struct header *hp, struct message *mp, enum sendaction action,
 156                 sighandler_type oldint)
 157 {
 158         FILE *nf = NULL;
 159         int t;
 160         time_t modtime;
 161         char *edit;
 162         struct stat statb;
 163         char *tempEdit;
 164         sigset_t        set;
 165
 166         if ((nf = Ftemp(&tempEdit, "Re", "w", readonly ? 0400 : 0600, 1))
 167                         == NULL) {
 168                 perror(catgets(catd, CATSET, 73, "temporary mail edit file"));
 169                 goto out;
 170         }
 171         if (hp) {
 172                 t = GTO|GSUBJECT|GCC|GBCC|GNL|GCOMMA;
 173                 if (hp->h_from || hp->h_replyto || hp->h_sender ||
 174                                 hp->h_organization)
 175                         t |= GIDENT;
 176                 puthead(hp, nf, t, SEND_TODISP, CONV_NONE, NULL, NULL);
 177         }
 178         if (mp) {
 179                 send(mp, nf, 0, NULL, action, NULL);
 180         } else {
 181                 if (size >= 0)
 182                         while (--size >= 0 && (t = getc(fp)) != EOF)
 183                                 putc(t, nf);
 184                 else
 185                         while ((t = getc(fp)) != EOF)
 186                                 putc(t, nf);
 187         }
 188         fflush(nf);
 189         if (fstat(fileno(nf), &statb) < 0)
 190                 modtime = 0;
 191         else
 192                 modtime = statb.st_mtime;
 193         if (ferror(nf)) {
 194                 Fclose(nf);
 195                 perror(tempEdit);
 196                 unlink(tempEdit);
 197                 Ftfree(&tempEdit);
 198                 nf = NULL;
 199                 goto out;
 200         }
 201         if (Fclose(nf) < 0) {
 202                 perror(tempEdit);
 203                 unlink(tempEdit);
 204                 Ftfree(&tempEdit);
 205                 nf = NULL;
 206                 goto out;
 207         }
 208         nf = NULL;
 209         if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
 210                 edit = type == 'e' ? "ed" : "vi";
 211         sigemptyset(&set);
 212         if (run_command(edit, oldint != SIG_IGN ? &set : NULL, -1, -1,
 213                                 tempEdit, NULL, NULL) < 0) {
 214                 unlink(tempEdit);
 215                 Ftfree(&tempEdit);
 216                 goto out;
 217         }
 218         /*
 219          * If in read only mode or file unchanged, just remove the editor
 220          * temporary and return.
 221          */
 222         if (readonly) {
 223                 unlink(tempEdit);
 224                 Ftfree(&tempEdit);
 225                 goto out;
 226         }
 227         if (stat(tempEdit, &statb) < 0) {
 228                 perror(tempEdit);
 229                 Ftfree(&tempEdit);
 230                 goto out;
 231         }
 232         if (modtime == statb.st_mtime) {
 233                 unlink(tempEdit);
 234                 Ftfree(&tempEdit);
 235                 goto out;
 236         }
 237         /*
 238          * Now switch to new file.
 239          */
 240         if ((nf = Fopen(tempEdit, "a+")) == NULL)
 241                 perror(tempEdit);
 242 out:
 243         if (tempEdit) {
 244                 unlink(tempEdit);
 245                 Ftfree(&tempEdit);
 246         }
 247         return nf;
 248 }