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

   1
   2 /*
   3  * m_backup.c -- construct a backup file
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11
  12
  13 char *
  14 m_backup (char *file)
  15 {
  16     char *cp;
  17     static char buffer[BUFSIZ];
  18
  19     if ((cp = r1bindex(file, '/')) == file)
  20         snprintf(buffer, sizeof(buffer), "%s%s",
  21                 BACKUP_PREFIX, cp);
  22     else
  23         snprintf(buffer, sizeof(buffer), "%.*s%s%s", (int)(cp - file), file,
  24                 BACKUP_PREFIX, cp);
  25
  26     (void) m_unlink(buffer);
  27     return buffer;
  28 }