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 #include "m_mktemp.h"
  10
  11
  12 char *
  13 m_backup (const char *file)
  14 {
  15     const char *cp;
  16     static char buffer[BUFSIZ];
  17
  18     if ((cp = r1bindex((char *) file, '/')) == file)
  19         snprintf(buffer, sizeof(buffer), "%s%s",
  20                 BACKUP_PREFIX, cp);
  21     else
  22         snprintf(buffer, sizeof(buffer), "%.*s%s%s", (int)(cp - file), file,
  23                 BACKUP_PREFIX, cp);
  24
  25     (void) m_unlink(buffer);
  26     return buffer;
  27 }