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 "r1bindex.h"
  10 #include "m_backup.h"
  11 #include "m_mktemp.h"
  12
  13
  14 char *
  15 m_backup (const char *file)
  16 {
  17     const char *cp;
  18     static char buffer[BUFSIZ];
  19
  20     if ((cp = r1bindex((char *) file, '/')) == file)
  21         snprintf(buffer, sizeof(buffer), "%s%s",
  22                 BACKUP_PREFIX, cp);
  23     else
  24         snprintf(buffer, sizeof(buffer), "%.*s%s%s", (int)(cp - file), file,
  25                 BACKUP_PREFIX, cp);
  26
  27     (void) m_unlink(buffer);
  28     return buffer;
  29 }