shared.c

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#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include "mutt/lib.h"
#include "core/lib.h"
#include "shared.h"
#include "globals.h"
#include "mdata.h"
 
mode_t mh_umask(struct Mailbox *m)
{
  struct MhMboxData *mhata = mh_mdata_get(m);
  if (mhata && mhata->umask)
    return mhata->umask;
 
  struct stat st = { 0 };
  if (stat(mailbox_path(m), &st) != 0)
  {
    mutt_debug(LL_DEBUG1, "stat failed on %s\n", mailbox_path(m));
    return 077;
  }
 
  return 0777 & ~st.st_mode;
}
 
bool mh_mkstemp(struct Mailbox *m, FILE **fp, char **tgt)
{
  int fd;
  char path[PATH_MAX] = { 0 };
 
  mode_t new_umask = mh_umask(m);
  mode_t old_umask = umask(new_umask);
  mutt_debug(LL_DEBUG3, "umask set to %03o\n", new_umask);
 
  while (true)
  {
    snprintf(path, sizeof(path), "%s/.neomutt-%s-%d-%" PRIu64, mailbox_path(m),
             NONULL(ShortHostname), (int) getpid(), mutt_rand64());
    fd = open(path, O_WRONLY | O_EXCL | O_CREAT, 0666);
    if (fd == -1)
    {
      if (errno != EEXIST)
      {
        mutt_perror("%s", path);
        umask(old_umask);
        mutt_debug(LL_DEBUG3, "umask set to %03o\n", old_umask);
        return false;
      }
    }
    else
    {
      *tgt = mutt_str_dup(path);
      break;
    }
  }
  umask(old_umask);
  mutt_debug(LL_DEBUG3, "umask set to %03o\n", old_umask);
 
  *fp = fdopen(fd, "w");
  if (!*fp)
  {
    FREE(tgt);
    close(fd);
    unlink(path);
    return false;
  }
 
  return true;
}