commit 3ad94d6072555955a796c8c72a526c4fdff86711
author Dave Hylands <dhylands@gmail.com> Mon May 18 14:41:25 2015 -0700
committer Damien George <damien.p.george@gmail.com> Wed May 20 09:29:22 2015 +0100
tree c845f32926a12105b6929b422c3b66c55f098481
parent 97ce883217c646a2d2bc9bf6bfce6e2eaa731dae

extmod: Add ubinascii.unhexlify

This also pulls out hex_digit from py/lexer.c and makes unichar_hex_digit

py/unicode.c

diff --git a/py/unicode.c b/py/unicode.c
index db4aa43..63e9601 100644
--- a/py/unicode.c
+++ b/py/unicode.c
@@ -169,3 +169,13 @@
     }
     return c;
 }
+
+mp_uint_t unichar_xdigit_value(unichar c) {
+    // c is assumed to be hex digit
+    mp_uint_t n = c - '0';
+    if (n > 9) {
+        n &= ~('a' - 'A');
+        n -= ('A' - ('9' + 1));
+    }
+    return n;
+}