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Command: dn_expand | Section: 3 | Source: Digital UNIX | File: dn_expand.3.gz
dn_expand(3) Library Functions Manual 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
Specifies a pointer to the beginning of a message. Points to the end
of the original message that contains the compressed domain name.
Specifies a pointer to a compressed domain name. Specifies a pointer
to a buffer that holds the resulting expanded domain name. 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 do-
main 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 infor-
mation that is used by the resolver functions is kept in the _res data
structure. The /include/resolv.h file contains the _res structure de-
finition.
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
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) delim off
dn_expand(3)