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-rw-r--r--include/arpa/inet.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/arpa/inet.h b/include/arpa/inet.h
index 34ff52c..a7bd2c1 100644
--- a/include/arpa/inet.h
+++ b/include/arpa/inet.h
@@ -157,6 +157,32 @@ uint64_t _htonll(uint64_t)
#endif
+/* TODO We "need" conversion to and from two's complement.
+ * It is important to remember than intN_t cannot be
+ * used for this functions because they require two's
+ * complement.
+ *
+ * unsigned to_twos_complement(signed v) {
+ * unsigned r;
+ * if (v >= -0)
+ * return (unsigned)v;
+ * r = (unsigned)-v;
+ * r = ~(r - 1);
+ * return r;
+ * }
+ *
+ * signed from_twos_complement(unsigned v) {
+ * signed r;
+ * if ((v >> (X_BIT - 1)) == 0)
+ * return (signed)v;
+ * r = ~r;
+ * if (r == X_MAX)
+ * return errno = ERANGE, 0;
+ * return errno = 0, r + 1;
+ * }
+ */
+
+
#endif