1 files changed, 2 insertions, 0 deletions
diff --git a/nasmlib.h b/nasmlib.h
index 2c335e1..e571159 100644
--- a/nasmlib.h
+++ b/nasmlib.h
@@ -205,6 +205,8 @@ int nasm_memicmp(const char *, const char *, size_t);
 char *nasm_strsep(char **stringp, const char *delim);
 #endif
 
+/* This returns the numeric value of a given 'digit'. */
+#define numvalue(c)         ((c) >= 'a' ? (c) - 'a' + 10 : (c) >= 'A' ? (c) - 'A' + 10 : (c) - '0')
 
 /*
  * Convert a string into a number, using NASM number rules. Sets