Path: utzoo!attcan!uunet!wuarchive!usc!isi.edu!gremlin!wind!kkenny
From: kkenny@wind.nrtc.northrop.com (Kevin B. Kenny KE9TV)
Newsgroups: comp.lang.c
Subject: Re: Converting ascii hex values to hex bytes
Summary: Use the system library when it's available...
Keywords: inet, inet
Message-ID: <11563@gremlin.nrtc.northrop.com>
Date: 24 Oct 90 16:52:52 GMT
References: <298@cti1.UUCP> <1990Oct23.220754.15958@uunet!unhd>
Sender: news@gremlin.nrtc.northrop.com
Reply-To: ke9tv@nrtc.northrop.com
Followup-To: comp.lang.c
Distribution: comp
Organization: Northrop Research & Technology Center, Palos Verdes, CA
Lines: 28

In article <298@cti1.UUCP> mpledger@cti1.UUCP (Mark Pledger) writes:
>What I want to do is to be able to convert 122.10.10.44 into a
>character string of 4 bytes that equals "\x7a\x0a\x0a\x2c".  How can
>I convert the ascii representation into hex?  I tried using itoa(),
>but the result is in ascii character format

If you're on a 4.x BSD machine, or another one that has the `inet'
library, the accepted way to parse Internet addresses is:

----------------------------------------
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

...

	char * address_in_dotted_form;
	unsigned long parsed_address;

...

	parsed_address = inet_addr (address_in_dotted_form);
----------------------------------------

The manual page for this is inet(3n).

Kevin, KE9TV