1 files changed, 27 insertions, 0 deletions
diff --git a/awklib/eg/prog/testbits.awk b/awklib/eg/prog/testbits.awk
new file mode 100644
index 00000000..143cd916
--- /dev/null
+++ b/awklib/eg/prog/testbits.awk
@@ -0,0 +1,27 @@
+# bits2str --- turn a byte into readable 1's and 0's
+
+function bits2str(bits,        data, mask)
+{
+    if (bits == 0)
+        return "0"
+
+    mask = 1
+    for (; bits != 0; bits = rshift(bits, 1))
+        data = (and(bits, mask) ? "1" : "0") data
+
+    while ((length(data) % 8) != 0)
+        data = "0" data
+
+    return data
+}
+BEGIN {
+    printf "123 = %s\n", bits2str(123)
+    printf "0123 = %s\n", bits2str(0123)
+    printf "0x99 = %s\n", bits2str(0x99)
+    comp = compl(0x99)
+    printf "compl(0x99) = %#x = %s\n", comp, bits2str(comp)
+    shift = lshift(0x99, 2)
+    printf "lshift(0x99, 2) = %#x = %s\n", shift, bits2str(shift)
+    shift = rshift(0x99, 2)
+    printf "rshift(0x99, 2) = %#x = %s\n", shift, bits2str(shift)
+}