Path: utzoo!mnetor!uunet!mcvax!ukc!stc!datlog!slxsys!jpp
From: jpp@slxsys.specialix.co.uk (John Pettitt)
Newsgroups: comp.unix.xenix
Subject: Re: memory allocation i.e. malloc
Message-ID: <118@slxsys.specialix.co.uk>
Date: 18 Dec 87 20:17:31 GMT
References: <2866@sdsu.UUCP>
Reply-To: jpp@slxsys.UUCP (John Pettitt)
Organization: Specialix International, London, UK.
Lines: 40
Keywords: malloc memory allocation core dump segment violation

In article <2866@sdsu.UUCP> gold@sdsu.UUCP (Dan Gold) writes:
>I having a problem allocating memory with malloc.  
>the problem is malloc returns negative when the address is > 32K.
>I tried the following code:
>#include<stdio.h>
>struct message { char foo[260]; } *msgs[900];
>main()
>{
>	int i;
>	for (i=0;i < 900;i++) 
>	{
>		msg[i]=(struct message *)malloc(sizeof(struct message));
>		printf("i= %d, msg[i] = %ld\n",i,msg[i]);
>	}
>}

malloc returns a pointer - you are asking printf to print a long int
and  a signed one at that !   Pointers don't have a sign, there is
no problem with malloc - just the printf doing what you told it to do.

P.S. pointers are 16 bit unless you use the -M flag to say otherwise
and they are ALWAYS unsigned

I
A
M
A
L
O
N
G
M
S
G

-- 
John Pettitt			UUCP   :{backbone}!mcvax!ukc!pyrltd!slxsys!jpp	
Specialix Systems		Domain :jpp%slxsys@pyra.co.uk
London, UK.  (Where else ? :-)  Voice  : +44 1 398 9422 (GMT)
rn: core dumped