reading from long string

[yezi]

Hi, ALL:

My question is I need read from a long string step by step, say first
read length 10 byes of string, process them, then read next 10 bytes of
that string.

Like the file operation fread. there is a pointer forwarding whenever I
read chunk from the file. Is any string read function provide such
kind of mechanism to record current pointer position of string?

Thanks for any comments .

bin YE

[winnie]

Re: reading from long string


yezi wrote:[color=blue]
> Hi, ALL:
>
> My question is I need read from a long string step by step, say first
> read length 10 byes of string, process them, then read next 10 bytes of
> that string.
>
> Like the file operation fread. there is a pointer forwarding whenever I
> read chunk from the file. Is any string read function provide such
> kind of mechanism to record current pointer position of string?
>
> Thanks for any comments .
>
> bin YE[/color]

Why not operate the pointer by yourself?e.g. doing p+=10 every step
will record the current position in p,i think.

[Keith Thompson]

Re: reading from long string

"yezi" <ye_line@hotmai l.com> writes:[color=blue]
> My question is I need read from a long string step by step, say first
> read length 10 byes of string, process them, then read next 10 bytes of
> that string.
>
> Like the file operation fread. there is a pointer forwarding whenever I
> read chunk from the file. Is any string read function provide such
> kind of mechanism to record current pointer position of string?[/color]

No, there's no standard function to do this -- but you don't need one.
All you need to do is keep track of where you are in the string,
either with an integer index or with a pointer.

For example, given:

const char *s = "hello, world";

s is a pointer to a string whose value is "hello, world", and s+7 is a
pointer to a string whose value is "world".

--
Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.