1 files changed, 21 insertions, 0 deletions
diff --git a/src/lib9/readn.c b/src/lib9/readn.c
new file mode 100644
index 00000000..e7b9d138
--- /dev/null
+++ b/src/lib9/readn.c
@@ -0,0 +1,21 @@
+#include <lib9.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;
+}