Re: [Dev-C++] Casting of int to string

[Jan M. <jan...@vo...>]

Thank you, it came to my mind what about the NULL character at the end of
the string.

Maybe one more thing. I am not sure if my code is ok because of the similar
reasons about some illegal memory usage.
So I have something like

struct bet_list
{
  int id;
char *name;
  struct bet_list *next;
};
...
struct bet_list *member, *temp;

member = malloc(sizeof(struct bet_list));

member->id = 1;
strcpy(member->name,  "some string here");
member->next = NULL;

...

I am not sure if malloc allocates enough space if it dont know how long is a
string I would like to put in.

Thanks again

Jan Mura

---- Original Message ----- 
From: "Per Westermark" <pw...@ia...>
To: "Philip Bennefall" <phi...@pb...>
Cc: "Jonathan Winterflood" <jon...@gm...>; "Jan Mura"
<jan...@vo...>; <dev...@li...>
Sent: Monday, May 07, 2007 10:21 AM
Subject: Re: [Dev-C++] Casting of int to string


> Better C libraries have the snprintf() function, that takes the size of
> the buffer as an input parameter.
>
> /pwm
>
> On Mon, 7 May 2007, Philip Bennefall wrote:
>
> > Sorry, I should've phrased it differently. Yup, allocating too little
memory is a bad idea in any situation because the function has no way of
knowing when it is supposed to stop writing. I just put 32 in there because
it ensures (100 %) that the entire value will be stored including the Null
terminator.
> >
> >   Regards
> >   Philip Bennefall
> >   ----- Original Message -----
> >   From: Jonathan Winterflood
> >   To: Jan Mura
> >   Cc: dev...@li...
> >   Sent: Monday, May 07, 2007 9:08 AM
> >   Subject: Re: [Dev-C++] Casting of int to string
> >
> >
> >   Just a note:
> >   """ It basically prints your integer into the character array, as long
as there is enough space to hold it """
> >   Actually it will print the integer whether there is enough space or
not.. It is entirely Your job to make sure there is enough space, or else
sprintf will just keep on printing in memory after the end of the array.
Obviously this is a very bad idea, since there is other data there.
> >   In this case, determining the necessary space is as easy as 'what's
the maximum digit count in an integer'... but in other cases, you can get
wierd crashes, wrong data for no apparent reason, or even create an exploit
in your program.
> >
> >   Thought you might want to know that (and if you did, no offense
intended :)
> >   Jonathan
> >
> >
> >   On 5/7/07, Philip Bennefall < phi...@pb...> wrote:
> >     This will do the job.
> >     char outputstring[32];
> >     sprintf(outputstring, "%d", integer);
> >
> >     It basically prints your integer into the character array, as long
as there
> >     is enough space to hold it. This method works both in C and C++.
There are
> >     other methods such as stringstream, but they only work in C++. If
you're
> >     compiling a C program, for this function to work you need to include
stdio.h
> >     and for C++ it is cstdio.
> >
> >     Regards
> >     Philip Bennefall
> >     ----- Original Message -----
> >     From: "Jan Mura" <jan...@vo...>
> >     To: <dev...@li... >
> >     Sent: Monday, May 07, 2007 8:26 AM
> >     Subject: [Dev-C++] Casting of int to string
> >
> >
> >     > Hello,
> >     >
> >     > I would like to compare an integer with a string using strcmp().
So I need
> >     > to cast the int type to string (*char). Is there some commone way
how to
> >     > do
> >     > it. Should I use & operator and adress of  int in teh function? Or
> >     > something
> >     > else?
> >     >
> >     > Thank you very much
> >     >
> >     > Jan Mura
> >     >
> >     >
> >



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