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   tmpnam
   Usage
   #include <stdio.h>
   char *tmpnam(char *s);

   Description
   The  tmpnam  function generates a unique temporary file name  that  is
   both valid, and not the same as, the name of any existing file.

   The  tmpnam  function  generates a different string each  time  it  is
   called, up a to a maximum which is defined by the macro TMP_MAX, found
   in stdio.h. If tmpnam is called more than TMP_MAX times the  generated
   names cannot be guaranteed to be unique. The argument passed to tmpnam
   can  be either a pointer to a buffer, which should be large enough  to
   hold the file name, or a NULL pointer.

   Example
   #include <stdio.h>

   main()
   {
   char *name;

        if((name = tmpnam(NULL)) != NULL)
             printf("Temporary file %s created",name);
        else
             printf("Unable to create temporary file");
   }

   Return Value
   If  the  argument  passed  to tmpnam is a pointer  to  a  buffer,  the
   temporary file name is placed in this buffer, and the return value  is
   a pointer to this buffer. If the argument to tmpnam is a NULL pointer,
   the  file  name is placed in a static data area, overwritten  at  each
   call to tmpnam, and a pointer to this static data buffer is returned.