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

   1
   2 /*
   3  * m_backup.c -- construct a backup file
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13
  14
  15 char *
  16 m_backup (char *file)
  17 {
  18     char *cp;
  19     static char buffer[BUFSIZ];
  20
  21     if ((cp = r1bindex(file, '/')) == file)
  22         snprintf(buffer, sizeof(buffer), "%s%s",
  23                 BACKUP_PREFIX, cp);
  24     else
  25         snprintf(buffer, sizeof(buffer), "%.*s%s%s", cp - file, file,
  26                 BACKUP_PREFIX, cp);
  27
  28     unlink(buffer);
  29     return buffer;
  30 }