22 lines
220 B
C
22 lines
220 B
C
#include <plan9.h>
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long
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readn(int f, void *av, long n)
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{
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char *a;
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long m, t;
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a = av;
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t = 0;
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while(t < n){
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m = read(f, a+t, n-t);
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if(m <= 0){
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if(t == 0)
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return m;
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break;
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}
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t += m;
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}
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return t;
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}
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