Initial revision

modules/src/object/byte_order.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+
+char	bytes_reversed = 0;
+char	words_reversed = 0;
+char	char_unsigned = 0;
+
+/*
+ * Determine the byte/word order in shorts/longs, assuming the size of a short
+ * is 2 chars, and the size of a long is 4 chars. Not all theoretical
+ * possibilities are tested; only bytes reversed and/or words reversed.
+ */
+determine_ordering()
+{
+	short	s;
+	long	l;
+	register char	*cp;
+	register short	*sp;
+
+	cp = (char *)&s;
+	cp[0] = 0x01; cp[1] = 0x02;
+	if (s != 0x01 + (0x02 << 8))
+		bytes_reversed = 1;
+	sp = (short *)&l;
+	sp[0] = 0x0001; sp[1] = 0x0002;
+	if (l != 0x0001 + (0x0002L << 16))
+		words_reversed = 1;
+}
+
+/*
+ * determine whether characters are unsigned or signed
+ */
+
+uns_char()
+{
+	char c = 0200;
+	int i = c;
+
+	if (i > 0) char_unsigned = 1;
+}
+
+main()
+{
+	determine_ordering();
+	uns_char();
+	printf("#define BYTES_REVERSED %d\n", bytes_reversed);
+	printf("#define WORDS_REVERSED %d\n", words_reversed);
+	printf("#define CHAR_UNSIGNED %d\n", char_unsigned);
+	return 0;
+}