FILE open question

[mrkan]

I am calling c program like this:

myprog < text.txt

How do I handle content of text.txt in my c program?
I could use gets but I need to use FILE pointer:

FILE *fp

and somehow to make this fp to point to text.txt

Is this possible?

Thanks

 

[Salem]

When you run the program like that, then the contents of the file appear on stdin

So

char buff[BUFSIZ];
while ( fgets( buff, sizeof buff, stdin ) != NULL ) {
}

will process the whole file.


--
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.

 

[xwb]

stdin is a FILE*

scanf(fmt, yyy);

is the same as

fscanf (stdin, fmt, yyy);

If you need to use fp, assign stdin to it

fp = stdin;

 

[SamBones]

And [tt]stdin[/tt], [tt]stdout[/tt], and [tt]stderr[/tt] are all already open by default when the process starts. You don't need to open them.

 

[mrkan]

thanks a lot