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

   1 /* m_backup.c -- construct a backup file
   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
  10
  11 char *
  12 m_backup (const char *file)
  13 {
  14     const char *cp;
  15     static char buffer[BUFSIZ];
  16
  17     if ((cp = r1bindex((char *) file, '/')) == file)
  18         snprintf(buffer, sizeof(buffer), "%s%s",
  19                 BACKUP_PREFIX, cp);
  20     else
  21         snprintf(buffer, sizeof(buffer), "%.*s%s%s", (int)(cp - file), file,
  22                 BACKUP_PREFIX, cp);
  23
  24     (void) m_unlink(buffer);
  25     return buffer;
  26 }