Not able to locate LINE_MAX in limits.h

parag_paul

hi all,
I am using a limits.h with the follwing header
/*
* ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types
<limits.h>
*/
But I am not able to locate LINE_MAX ( number of characters maximum
allowable in a line ) .
is this limit.h deprecated .

Oct 4 '08 #1

Subscribe Reply

8709

Martin Ambuhl

pa********@hotm ail.com wrote:

But I am not able to locate LINE_MAX ( number of characters maximum
allowable in a line ) .
is this limit.h deprecated .

There is no such thing as LINE_MAX in C. LINE_MAX is a POSIX macro and
is specifically about the maximum line limits that POSIX utilities
support. Questions about POSIX belong elsewhere. Note that many several
implementations which otherwise try to be POSIX, for example GNU C, pay
no attention to that family of macros and that even though defined have
no useful information. And, again, it has no meaning at in C itself,
and has never been part of C, and is, obviously, 'deprecated'. That
which never was is not deprecated.

Oct 4 '08 #2

Eric Sosman

pa********@hotm ail.com wrote:

hi all,
I am using a limits.h with the follwing header
/*
* ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types
<limits.h>
*/
But I am not able to locate LINE_MAX ( number of characters maximum
allowable in a line ) .

There's no such symbol (and if there were, <stdio.h>
would be a more plausible home for it). As far as I know
there is no programmatic way to discover the maximum length
of an output line, nor even whether there is a maximum.
Lines with up to 254 characters (253 plus '\n') are valid
on all hosted implementations of C.

is this limit.h deprecated .

Not by me. Maybe somebody else dislikes it, though.

--
Eric Sosman
es*****@ieee-dot-org.invalid

Oct 4 '08 #3

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