Thread: question about fseek

Hey,
Im trying to use fseek with a value input from stdin.

int fseek( FILE *fp, long offset, int origin)

Code:

long start;
.
.
.
fseek(finp, start, SEEK_SET);
while(c != '0') {
        c = fgetc(finp);
        printf("%d ", c);
}

So if start is say, 35, i want the printing of the file to start at position 35 from the beginning of the file. But istead it just starts from the beginning.
I replace variable start with values such as "5L , 7L , etc" to check fseek's validity and it works fine. I just dont know how to pass it start so it works.

So are you sure start is 35?

Originally Posted by tabstop

So are you sure start is 35?

Hey, I am using

Code:

int main(int argc, char *argv[])

so I had to convert the needed string to a long with function atol. duh..
Thanks for the help ;0

gp

What if I type in a negative number into your command line?

Originally Posted by master5001

What if I type in a negative number into your command line?

I have some error handling before the values are processed

Code:

if((start < 0 || end < 0 || start > counter || end > counter || start > end)) {
	fprintf(stderr, "Invalid range specified.\n");
	exit(1);
}

Good man