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dn_expand(3)
NAME
  dn_expand - Expands a compressed domain name

LIBRARY
  Standard C Library (libc.a)

SYNOPSIS

  #include <sys/types.h>

  #include <netinet/in.h>

  #include <arpa/nameser.h>

  #include <resolv.h>

  int dn_expand (
      u_char *message_ptr,
      u_char *end_of_message,
      u_char *compressed_name,
      u_char *expanded_name,
      int length );

PARAMETERS
  message_ptr
	    Specifies a pointer to the beginning of a message.

  end_of_message
	    Points to the end of the original message that contains the
	    compressed domain name.

  compressed_name
	    Specifies a pointer to a compressed domain name.

  expanded_name
	    Specifies a pointer to a buffer that holds the resulting expanded
	    domain name.

  length    Specifies the size of the buffer pointed to by the expanded_name
	    parameter.

DESCRIPTION
  The dn_expand() function expands a compressed domain name to a full domain
  name, converting the expanded names to uppercase.

  The dn_expand() function is one of a set of subroutines that form the
  resolver, a set of functions that resolves domain names.  Global
  information that is used by the resolver functions is kept in the _res data
  structure.  The  /include/resolv.h file contains the _res structure
  definition.

RETURN VALUES
  Upon successful completion, the dn_expand() function returns the size of
  the expanded domain name.  Otherwise, a value of -1 is returned.

FILES
  /etc/resolv.conf
	    Defines name server and domain name constants, structures, and
	    values.

RELATED INFORMATION
  Functions: res_init(3), res_mkquery(3), res_send(3), dn_comp(3),
  dn_find(3), _getshort(3), _getlong(3), putshort(3), putlong(3),
  dn_skipname(3)