treadn.c - plan9port - [fork] Plan 9 from user space
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       ---
       treadn.c (219B)
       ---
            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 }