Fix port alphabet

1 files changed, 6 insertions, 3 deletions

diff --git a/asm.c b/asm.c
index e42da16..4ecca1d 100644
--- a/asm.c
+++ b/asm.c
@@ -11,6 +11,7 @@
 
 #define TEXTALPH "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_"
 #define NUMALPH "0123456789"
+#define PORTALPH "abcdefghijklmnopqrstuvwxyz0123456789"
 #define NAMEALPH TEXTALPH NUMALPH
 #define WHITESPACE " \t\v\r\n,"
 
@@ -87,9 +88,11 @@ is_int(const char *str)
 static int
 asm_port_char_to_index(char c)
 {
-	if (!isalpha(c))
-		die("invalid io port char '%c'", c);
-	return tolower(c) - 'a';
+	char *p;
+
+	p = strchr(PORTALPH, tolower(c));
+	if (!p) die("invalid io port char '%c'", c);
+	return (int) (p - PORTALPH);
 }
 
 static bool