git: 9front

ref: c81d873c3968e85c85091e17259e181836a8c260
dir: /sys/src/cmd/unix/u9fs/readn.c/

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#include <plan9.h>

long
readn(int f, void *av, long n)
{
	char *a;
	long m, t;

	a = av;
	t = 0;
	while(t < n){
		m = read(f, a+t, n-t);
		if(m <= 0){
			if(t == 0)
				return m;
			break;
		}
		t += m;
	}
	return t;
}