read multiple lines from user input in c

[arch07]

hi all
can anyone tell me
in c how to read multiple lines from user input

using scanf it is not possible and using gets we can able to read one line at a time
hoe to read multiple lines at a time from user input....

[guus.leeuw.jr]

Arch,

I/O is buffered by default. So you have to switch it to unbuffered I/O, and then using getc, you can get any key (that generates a character) when the user presses it.

Have a look at the GNU readline package, it does all sorts of nifty stuff with User I/O.

Regards,
Guus

[elija]

Is there a reason you can't use a loop?

[leclay]

bytes_read = getline (&buffer, &no_bytes, stdin);

When there is a stream error getline() returns a -1;

See The C Programming Language, second edition, by Brian Kernighan and Dennis Ritchie, the C bible by the creators of the language. It's also one of the most readable programming manual yet written. It's only 272 pages, compare that to most C++ books.

[guus.leeuw.jr]

Please note that getline is pure GNU extension. You will not find it in anything written by K&R.

[karthi_27]

We can also achieve it by our own way like the following,

#include <stdio.h>
#include<malloc.h>
main(){
        int c;
        char *line;
        char *ptr;
        line=(char *)malloc(1);
        ptr=line;
        for (;( *line=c = getchar())!= EOF ;line++);
        *line='\0';
        printf("%s",ptr);
}

Thanks

[drl]

Hi.

The K & R ( The C programming Language ) does mention function getline in two instances, pages 26 and 67 ff. They are showing how to design such a function. My K & R is from 1978.

The c function that is supplied on GNU/Linux systems is not quite the same as the one in K & R, and is a GNU extension, see man getline for details ... cheers, drl

[arch07]

hi all,
thanks for suggestion...
its realy helpful

[guus.leeuw.jr]

drl
Sure they thought of it, but it is no part of *C*

[leclay]

My apologies for the confusion. It is included in the IEEE's
The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008
Copyright © 2001-2008 The IEEE and The Open Group
This is ANSI standard lib. for C & C++, find it in all ANSI standard stdio.h