git: 9front

ref: 2b5e9756f86ce90bec3f739037a0ee192e16fafe
dir: /sys/src/libc/port/readn.c/

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#include <u.h>
#include <libc.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;
}