After completing a good book on C (KNK's 2nd edition), I dusted off an oldie
for a good laugh or two. It's Traister's ``Mastering C Pointers'' and I am
aware of just how bad this book it. See my posting from 10 years ago here
in c.l.c.
Knowing the dubious quality of the book, what he writes on page 78 may be
fiction (but there's a chance it may have been true):
``The original C programming language contained a peek() function [...]''
Is there any basis in fact for this questionable statement? dmr? bwk?
14  5259 
"Bob Nelson" <bn*****@nelson be.comwrote in message
news:g2******** **@renpen.nelso nbe.com...
After completing a good book on C (KNK's 2nd edition), I dusted off an
oldie
for a good laugh or two. It's Traister's ``Mastering C Pointers'' and I am
aware of just how bad this book it. See my posting from 10 years ago here
in c.l.c.
Knowing the dubious quality of the book, what he writes on page 78 may be
fiction (but there's a chance it may have been true):
``The original C programming language contained a peek() function [...]''
Is there any basis in fact for this questionable statement? dmr? bwk?
No.
The 1976 C reference manual: http://www.fh-jena.de/~kleine/histor...enceManual.pdf
The 1967 BCPL reference manual: http://cm.bell-labs.com/cm/cs/who/dmr/bcpl.pdf
No peek() whatsoever.
** Posted from http://www.teranews.com **
Bob Nelson wrote:
After completing a good book on C (KNK's 2nd edition), I dusted off an oldie
for a good laugh or two. It's Traister's ``Mastering C Pointers'' and I am
aware of just how bad this book it. See my posting from 10 years ago here
in c.l.c.
Knowing the dubious quality of the book, what he writes on page 78 may be
fiction (but there's a chance it may have been true):
``The original C programming language contained a peek() function [...]''
Is there any basis in fact for this questionable statement? dmr? bwk?
PEEK and POKE was a basic thing. There were a few old C compilers
that added PEEK and POKE intrinsics as extensions. cc65 has peek
and poke macro's in one of the header files and I believe that one of the
C compilers for Radio Shack color computer had PEEK and POKE
intrinsics
AFAIK none of the early main stream compilers supported PEEK and
POKE. I just checked The Small C Handbook by Hendrix and it
doesn't document a PEEK and POKE.
w..
Walter Banks wrote:
PEEK and POKE was a basic thing. There were a few old C compilers
that added PEEK and POKE intrinsics as extensions. cc65 has peek
and poke macro's in one of the header files and I believe that one of
the C compilers for Radio Shack color computer had PEEK and POKE
intrinsics
AFAIK none of the early main stream compilers supported PEEK and
POKE. I just checked The Small C Handbook by Hendrix and it
doesn't document a PEEK and POKE.
Depends on what you mean by early mainstream. Turbo C had them,
including peekb() and pokeb() for byte access.
Brian
In article <48************ ***@bytecraft.c om>,
Walter Banks <wa****@bytecra ft.comwrote:
>PEEK and POKE was a basic thing. There were a few old C compilers
that added PEEK and POKE intrinsics as extensions.
This must be some strange 8086 stuff. On sensible architectures (or
even good implementations on odd ones) you just use *(type *)address.
-- Richard
--
In the selection of the two characters immediately succeeding the numeral 9,
consideration shall be given to their replacement by the graphics 10 and 11 to
facilitate the adoption of the code in the sterling monetary area. (X3.4-1963)
Richard Tobin wrote:
Walter Banks <wa****@bytecra ft.comwrote:
>PEEK and POKE was a basic thing. There were a few old C compilers
that added PEEK and POKE intrinsics as extensions.
This must be some strange 8086 stuff. On sensible architectures (or
even good implementations on odd ones) you just use *(type *)address.
However most languages do not bandy about the process of creating
pointers or dereferencable addresses. Hiding this extension
operation in procedures/functions allows the implementor to control
the action.
--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.
** Posted from http://www.teranews.com **
Richard Tobin wrote:
In article <48************ ***@bytecraft.c om>,
Walter Banks <wa****@bytecra ft.comwrote:
PEEK and POKE was a basic thing. There were a few old C compilers
that added PEEK and POKE intrinsics as extensions.
This must be some strange 8086 stuff. On sensible architectures (or
even good implementations on odd ones) you just use *(type *)address.
I think the only purpose was for customers that were
translating basic programs who had little familiarity
with C. The cc65 definitions were as you suggested
#define POKE(addr,val) (*(unsigned char*) (addr) = (val))
#define PEEK(addr) (*(unsigned char*) (addr))
they also had PEEK and POKEW for ints.
w..
"Dann Corbit" <dc*****@connx. comwrote in message
news:db******** *********@news. teranews.com...
"Bob Nelson" <bn*****@nelson be.comwrote in message
news:g2******** **@renpen.nelso nbe.com...
After completing a good book on C (KNK's 2nd edition), I dusted off an
oldie
for a good laugh or two. It's Traister's ``Mastering C Pointers'' and I
am
aware of just how bad this book it. See my posting from 10 years ago
here
in c.l.c.
Knowing the dubious quality of the book, what he writes on page 78 may
be
fiction (but there's a chance it may have been true):
``The original C programming language contained a peek() function
[...]''
Is there any basis in fact for this questionable statement? dmr? bwk?
No.
The 1976 C reference manual:
http://www.fh-jena.de/~kleine/histor...enceManual.pdf
>
The 1967 BCPL reference manual:
http://cm.bell-labs.com/cm/cs/who/dmr/bcpl.pdf
No peek() whatsoever.
** Posted from http://www.teranews.com **
But peek() does exist in the "B" language, which is often regarded
as a pre-cursor to "C". http://www.thinkage.ca/english/gcos/...lib/0peek.html
"Dann Corbit" <dc*****@connx. comwrites:
"Bob Nelson" <bn*****@nelson be.comwrote in message
news:g2******** **@renpen.nelso nbe.com...
>After completing a good book on C (KNK's 2nd edition), I dusted off an
oldie
for a good laugh or two. It's Traister's ``Mastering C Pointers'' and I am
aware of just how bad this book it. See my posting from 10 years ago here
in c.l.c.
Knowing the dubious quality of the book, what he writes on page 78 may be
fiction (but there's a chance it may have been true):
``The original C programming language contained a peek() function [...]''
Is there any basis in fact for this questionable statement? dmr? bwk?
No.
The 1976 C reference manual:
http://www.fh-jena.de/~kleine/histor...enceManual.pdf
Both the question and this part of your answer miss an important
point. In those early days, there was no "standard" C library. As a
systems programming language, it seemed natural that every system
would provide a library that interfaced to whatever was "there".
There was a GCOS C library, an IBM 370 C library, a Unix C library...
For this reason, the document you cite does not list the library
functions. It talks about some of them, but it does not claim to list
those that should be available on all (or even most) C
implementations . It states: "The UNIX Programmer s Manual [4]
describes the library routines available to C programs under UNIX..".
--
Ben.
On Jun 6, 5:25*am, "Mike Smith" <mikesmit...@no .spam.btconnect .com>
wrote:
"Dann Corbit" <dcor...@connx. comwrote in message
news:db******** *********@news. teranews.com...
"Bob Nelson" <bnel...@nelson be.comwrote in message
news:g2******** **@renpen.nelso nbe.com...
After completing a good book on C (KNK's 2nd edition), I dusted off an
oldie
for a good laugh or two. It's Traister's ``Mastering C Pointers'' and I
am
aware of just how bad this book it. See my posting from 10 years ago
here
in c.l.c.
Knowing the dubious quality of the book, what he writes on page 78 may
be
fiction (but there's a chance it may have been true):
``The original C programming language contained a peek() function
[...]''
Is there any basis in fact for this questionable statement? dmr? bwk?
No.
The 1976 C reference manual:
http://www.fh-jena.de/~kleine/histor...-CReferenceMan...
The 1967 BCPL reference manual:
http://cm.bell-labs.com/cm/cs/who/dmr/bcpl.pdf
No peek() whatsoever.
** Posted fromhttp://www.teranews.co m**
But peek() does exist in the "B" language, which is often regarded
as a pre-cursor to "C".
http://www.thinkage.ca/english/gcos/...ib/0peek.html- Hide quoted text -
C was not derived from B. C was derived from BCPL: http://cm.bell-labs.com/who/dmr/chist.html This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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