off topic: How to read input from keyboard by the Std. C?

[Jeff Kinz]

> On Fri, 10 Dec 2004 16:14:36 -0200, Vinicius <cviniciusm at terra.com.br> wrote:
> > Hello,
> > 
> > how to read input from keyboard (through a console) by the standard
> > language C, please? I suppose an experienced Unix/Linux programmer has
> > the answer.
> > 
On Fri, Dec 10, 2004 at 08:16:43PM +0200, Uri Kogan wrote:
> use fscanf(stdin, ...)

Easiest to use and which is still safe is fgets, example:

/*  THIS example is a working program.  You can paste it into a file and
compile it and it will work as is. */
#include <stdio.h>
main (int argc, char ** argv) {
char mystring[20000];
void * x;

        x = fgets( mystring, 20000, stdin);
        printf("Mystring was %s\n",mystring);
}
/* End of example*/


(note excessively long string buffer mystring, - This is a hangover
from the days when people routinely used "gets". "gets" allowed buffer
overruns and so people routinely allocated extremely huge string buffers
to avoid crashes from the buffer overruns.

fgets avoids the overruns because it will not read in any more than
"n" bytes, where n is the integer you pass to fgets as the second
argument.

"stdin" is a "FILE *" that is always open on standard input.  You don't
need to declare it or anything

see "man fgets"


-- 
Linux/Open Source:  Your infrastructure belongs to you, free, forever.
Idealism:  "Realism applied over a longer time period"
http://www.scaled.com/projects/tierone/
<a href=http://kinz.org>Kinz</a>
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Jeff Kinz, Emergent Research, Hudson, MA.
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