comp.lang.c Google Group

كارثه امطار جده بالصور

mmu...@gmail.com (املي) — Fri, 11 Nov 2009 19:21:28 UT

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Re: K&R hash table question.

r124c4u...@comcast.net (osmium) — Fri, 11 Nov 2009 17:50:17 UT

How about page 144? Note the modulo operator in the returned value. That
reduces the value to the range of the array.
Segmentation faults result from running code, post the code.

Re: K&R hash table question.

giacomo.degliespo...@gmail.com (Giacomo Degli Esposti) — Fri, 11 Nov 2009 17:24:25 UT

[...]
Hello.
I haven't a copy of the book to check at the moment, but this seems
quite unlikely that k&r contains such an error.
I see two possibilities: maybe the hash function returns a value that
is
always in the interval 0..N-1 where N is the numebr of elements of
the array.
The other possibility is that a mod N is applied so that the

Re: Improving efficiency of a bytecode interpreter

ks...@mib.org (Keith Thompson) — Fri, 11 Nov 2009 16:37:39 UT

But you can't cast (or otherwise convert) function types. You can
cast pointer-to-function types.

K&R hash table question.

da.mi.spi...@gmail.com (b4283) — Fri, 11 Nov 2009 16:29:32 UT

Hi,
I've encountered some confusing questions while reading k&r ed2.
Around page 128, in the book, has introduced an "hash-search
algorithm", while they uses hash(s) which is the hashed number of an
string, as the array index, this had raised my question: doesn't array
indexes have to start from 0 to (i-1), but random assigning index is

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Re: cascading stdarg calls

kees.van.der.b...@gmail.com (cornelis van der bent) — Fri, 11 Nov 2009 15:16:51 UT

Thanks for pointing this out. Apologies! I did search google for a
short period but without succes, but had forgotten to look in the good
old C-FAQ.
Cornelis

Re: Endianness macros

sp4mtr4p.boudew...@indes.com (Boudewijn Dijkstra) — Fri, 11 Nov 2009 15:09:34 UT

Op Fri, 27 Nov 2009 13:18:02 +0100 schreef Noob <r...@127.0.0.1>:
Totally irrelevant.
I assume that the target address is external to the MCU.
It depends. If the data bus you're talking to is 8 bits, then it might
matter, depending on whether your MCU has an appropriately configured
external bus controller peripheral. If the data bus is 32 bits, then you

Re: cascading stdarg calls

kees.van.der.b...@gmail.com (cornelis van der bent) — Fri, 11 Nov 2009 15:13:49 UT

On 27 nov, 15:55, Giacomo Degli Esposti
Thanks for the quick answer! It's already in my code now and of
course works.
Cornelis

Re: cascading stdarg calls

ben.use...@bsb.me.uk (Ben Bacarisse) — Fri, 11 Nov 2009 14:59:46 UT

This is a FAQ: [link]
You have to read the linked FAQs first.
<snip>

Re: cascading stdarg calls

giacomo.degliespo...@gmail.com (Giacomo Degli Esposti) — Fri, 11 Nov 2009 14:55:55 UT

On 27 Nov, 15:34, cornelis van der bent <kees.van.der.b...@gmail.com>
wrote:
hello.
The problem is that you cannot call a function with "..." passing
it a va_list. You have to create a function accepting a va_list
as argument.
In your code, you are not calling sprintf, but vsprintf. This is
for the same reason: you cannot call sprintf and pass it a va_list.

Re: cascading stdarg calls

mohangupt...@gmail.com (mohangupta13) — Fri, 11 Nov 2009 14:43:56 UT

On Nov 27, 7:34 pm, cornelis van der bent
where is protocolText defined?

Re: Improving efficiency of a bytecode interpreter

ben.use...@bsb.me.uk (Ben Bacarisse) — Fri, 11 Nov 2009 14:43:23 UT

It is much more common to typedef function pointer types rather than
the function types themselves, but there are some advantages to the
latter. For example, it lets you declare a bunch of similar functions
very compactly:
typedef void binary_op(struct state *, struct value, struct value);
extern binary_op op_add, op_sub, op_mul, op_div /*...*/;

Re: Endianness macros

mwil...@the-wire.com (Mel) — Fri, 11 Nov 2009 14:39:38 UT

Also very common when you've got a buffer full of binary stuff read in from
some other medium -- file, Internet packet, EEPROM, etc. -- which was
created with a different convention from yours.
Mel.

cascading stdarg calls

kees.van.der.b...@gmail.com (cornelis van der bent) — Fri, 11 Nov 2009 14:34:16 UT

Hi, the code below prints a garbage "world" value to <messages>;
"Hello " is fine. What can be the problem?
static char messages[LARGE_ENOUGH];
int writeText(char* text, char* format, ...)
{
va_list argumentList;
va_start(argumentList, format);
vsprintf(text, format, argumentList);
va_end(argumentList);