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From: chris@mimsy.umd.edu (Chris Torek)
Newsgroups: comp.lang.c
Subject: Re: Strtol and strtoul...
Message-ID: <21305@mimsy.umd.edu>
Date: 15 Dec 89 23:44:52 GMT
References: <3233@com50.C2S.MN.ORG>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 21

In article <3233@com50.C2S.MN.ORG> markc@com2serv.c2s.mn.org
(Mark H. Colburn) writes:
>	unsigned long	foo;
>	char           *ptr;
>
>	foo = strtoul("-12345", &ptr, 0);

>... where would ptr point to?  The call should return ULONG_MAX with errno
>set to ERANGE, but does *ptr = '-' or '\0' (end of string) or is it
>indeterminate?  It looks as if it should point to '\0', but... 

It should return (unsigned long)-12345, which is typically either
53191 or 4294954951, and leave *ptr=='\0'.  For

	foo = strtoul("340282366920938463463374607431768211456", &ptr, 0);

which *is* too big (unless you have 128 bit `long's), it should
return ULONG_MAX, errno==ERANGE, and *ptr=='\0'.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@cs.umd.edu	Path:	uunet!mimsy!chris