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From: meissner@cygnus.com (Michael Meissner)
Newsgroups: comp.unix.solaris,comp.unix.bsd.misc,comp.unix.internals
Subject: Re: Solaris 2.6
Date: 11 Dec 1996 13:39:31 -0500
Organization: Cygnus Support
Lines: 22
Distribution: inet
Message-ID: <sylob50vto.fsf@tiktok.cygnus.com>
References: <32986299.AC7@mail.esrin.esa.it> <casper.329d5a07@mail.fwi.uva.nl>
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<587mc1$1dc@cucumber.demon.co.uk> <589rd5$i2l@agate.berkeley.edu>
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In-reply-to: alanc@godzilla.eecs.berkeley.edu's message of 6 Dec 1996 19:15:49
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In article <589rd5$i2l@agate.berkeley.edu> alanc@godzilla.eecs.berkeley.edu
(Alan Coopersmith) writes:
| andrew@cucumber.demon.co.uk (Andrew Gabriel) writes in comp.unix.solaris:
| |Out of curiosity, how would you print a pointer (for debugging say)?
| |printf("pointer = 0x%lx", (long) ptr);
| |How should it be done portably?
|
| According to my copy of the ANSI C standard, "%p" is the format
| specifier for printing pointers (the exact output format is
| implementation defined though so you're not guaranteed hex or decimal).
Not quite. %p is for printing void * pointers. It is only guaranteed that
void * pointers use the same size and format as char * pointers. All other
pointers do not have to be the same size and/or format (and since I'm the one
that wrote the %p proposal in the first place, and at the time I was supporting
a C compiler that had different pointer formats, it was intentional that it be
only void * pointers).
--
Michael Meissner, Cygnus Support (East Coast)
4th floor, 955 Massachusetts Avenue, Cambridge, MA 02139, USA
meissner@cygnus.com, 617-354-5416 (office), 617-354-7161 (fax)