diplodocus.org Git - nmh/blob - sbr/folder_addmsg.c

   1 /* folder_addmsg.c -- Link message into folder
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include "h/mh.h"
   9 #include "ext_hook.h"
  10 #include "folder_realloc.h"
  11 #include "folder_addmsg.h"
  12 #include "error.h"
  13 #include <fcntl.h>
  14
  15 /*
  16  * Link message into a folder.  Return the new number
  17  * of the message.  If an error occurs, return -1.
  18  */
  19
  20 int
  21 folder_addmsg (struct msgs **mpp, char *msgfile, int selected,
  22                int unseen, int preserve, int deleting, char *from_dir)
  23 {
  24     int infd, outfd, linkerr, msgnum;
  25     char *nmsg, newmsg[BUFSIZ];
  26     char oldmsg[BUFSIZ];
  27     struct msgs *mp;
  28     struct stat st1, st2;
  29
  30     mp = *mpp;
  31
  32     /* should we preserve the numbering of the message? */
  33     if (preserve && (msgnum = m_atoi (msgfile)) > 0) {
  34         ;
  35     } else if (mp->nummsg == 0) {
  36         /* check if we are adding to empty folder */
  37         msgnum = 1;
  38     } else {
  39         /* else use highest message number + 1 */
  40         msgnum = mp->hghmsg + 1;
  41     }
  42
  43     /*
  44      * We might need to make several attempts
  45      * in order to add the message to the folder.
  46      */
  47     for (;; msgnum++) {
  48
  49         /*
  50          * See if we need more space.  If we need space at the
  51          * end, then we allocate space for an addition 100 messages.
  52          * If we need space at the beginning of the range, then just
  53          * extend message status range to cover this message number.
  54          */
  55         if (msgnum > mp->hghoff) {
  56             if (!(mp = folder_realloc (mp, mp->lowoff, msgnum + 100))) {
  57                 inform("unable to allocate folder storage");
  58                 return -1;
  59             }
  60             *mpp = mp;
  61         } else if (msgnum < mp->lowoff) {
  62             if (!(mp = folder_realloc (mp, msgnum, mp->hghoff))) {
  63                 inform("unable to allocate folder storage");
  64                 return -1;
  65             }
  66             *mpp = mp;
  67         }
  68
  69         /*
  70          * If a message is already in that slot,
  71          * then loop to next available slot.
  72          */
  73         if (does_exist (mp, msgnum))
  74             continue;
  75
  76         /* setup the bit flags for this message */
  77         clear_msg_flags (mp, msgnum);
  78         set_exists (mp, msgnum);
  79
  80         /* should we set the SELECT_UNSEEN bit? */
  81         if (unseen) {
  82             set_unseen (mp, msgnum);
  83         }
  84
  85         /* should we set the SELECTED bit? */
  86         if (selected) {
  87             set_selected (mp, msgnum);
  88
  89             /* check if highest or lowest selected */
  90             if (mp->numsel == 0) {
  91                 mp->lowsel = msgnum;
  92                 mp->hghsel = msgnum;
  93             } else {
  94                 if (msgnum < mp->lowsel)
  95                     mp->lowsel = msgnum;
  96                 if (msgnum > mp->hghsel)
  97                     mp->hghsel = msgnum;
  98             }
  99
 100             /* increment number selected */
 101             mp->numsel++;
 102         }
 103
 104         /*
 105          * check if this is highest or lowest message
 106          */
 107         if (mp->nummsg == 0) {
 108             mp->lowmsg = msgnum;
 109             mp->hghmsg = msgnum;
 110         } else {
 111             if (msgnum < mp->lowmsg)
 112                 mp->lowmsg = msgnum;
 113             if (msgnum > mp->hghmsg)
 114                 mp->hghmsg = msgnum;
 115         }
 116
 117         /* increment message count */
 118         mp->nummsg++;
 119
 120         nmsg = m_name (msgnum);
 121         snprintf (newmsg, sizeof(newmsg), "%s/%s", mp->foldpath, nmsg);
 122
 123         /*
 124          * Now try to link message into folder.
 125          * Then run the external hook on the message if one was specified in the context.
 126          * Run the refile hook if we're moving the message from one place to another.
 127          * We have to construct the from path name for this because it's not there.
 128          * Run the add hook if the message is getting copied or linked somewhere else.
 129          */
 130         if (link (msgfile, newmsg) != -1) {
 131             if (deleting) {
 132                 (void)snprintf(oldmsg, sizeof (oldmsg), "%s/%s", from_dir, msgfile);
 133                 (void)ext_hook("ref-hook", oldmsg, newmsg);
 134             }
 135             else
 136                 (void)ext_hook("add-hook", newmsg, NULL);
 137
 138             return msgnum;
 139         }
 140         linkerr = errno;
 141
 142 #ifdef EISREMOTE
 143         if (linkerr == EISREMOTE)
 144             linkerr = EXDEV;
 145 #endif /* EISREMOTE */
 146
 147         /*
 148          * Check if the file in our desired location is the same
 149          * as the source file.  If so, then just leave it alone
 150          * and return.  Otherwise, we will continue the main loop
 151          * and try again at another slot (hghmsg+1).
 152          */
 153         if (linkerr == EEXIST) {
 154             if (stat (msgfile, &st2) == 0 && stat (newmsg, &st1) == 0
 155                 && st2.st_ino == st1.st_ino) {
 156                 return msgnum;
 157             }
 158             continue;
 159         }
 160
 161         /*
 162          * If link failed because we are trying to link
 163          * across devices, then check if there is a message
 164          * already in the desired location.  If so, then return
 165          * error, else just copy the message.
 166          * Cygwin with FAT32 filesystem produces EPERM.
 167          */
 168         if (linkerr == EXDEV  ||  linkerr == EPERM) {
 169             if (stat (newmsg, &st1) == 0) {
 170                 inform("message %s:%s already exists", mp->foldpath, newmsg);
 171                 return -1;
 172             }
 173
 174             if ((infd = open (msgfile, O_RDONLY)) == -1) {
 175                 advise (msgfile, "unable to open message %s", msgfile);
 176                 return -1;
 177             }
 178             fstat (infd, &st1);
 179             if ((outfd = creat (newmsg, (int) st1.st_mode & 0777)) == -1) {
 180                 advise (newmsg, "unable to create");
 181                 close (infd);
 182                 return -1;
 183             }
 184             cpydata (infd, outfd, msgfile, newmsg);
 185             close (infd);
 186             close (outfd);
 187
 188             if (deleting) {
 189                 (void)snprintf(oldmsg, sizeof (oldmsg), "%s/%s", from_dir, msgfile);
 190                 (void)ext_hook("ref-hook", oldmsg, newmsg);
 191             }
 192             else
 193                 (void)ext_hook("add-hook", newmsg, NULL);
 194
 195             return msgnum;
 196         }
 197
 198         /*
 199          * Else, some other type of link error,
 200          * so just return error.
 201          */
 202         advise (newmsg, "error linking %s to", msgfile);
 203         return -1;
 204     }
 205 }