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	readn.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	readn.c (219B)
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	1 #include <lib9.h>
	2
	3 long
	4 readn(int f, void *av, long n)
	5 {
	6 char *a;
	7 long m, t;
	8
	9 a = av;
	10 t = 0;
	11 while(t < n){
	12 m = read(f, a+t, n-t);
	13 if(m <= 0){
	14 if(t == 0)
	15 return m;
	16 break;
	17 }
	18 t += m;
	19 }
	20 return t;
	21 }