Move magic constant test into separate function

2 files changed, 7 insertions, 1 deletions

diff --git a/wtf8.c b/wtf8.c
index fd8bc78..c80875d 100644
--- a/wtf8.c
+++ b/wtf8.c
@@ -1,5 +1,9 @@
 #include "wtf8.h"
 
+int is_utf8_cont(char c) {
+    return (c & 0xC0) == 0x80;
+}
+
 int main(int argc, char **argv) {
     char *p;
     int c;
@@ -12,7 +16,7 @@ int main(int argc, char **argv) {
     putchar('\n');
 
     for (p = argv[1]; *p; ) {
-        for (c = 1; p[c] && (p[c] & 0xC0) == 0x80; c++)
+        for (c = 1; p[c] && is_utf8_cont(p[c]); c++)
             printf("   ");
         putchar(' ');
         for (; c > 0; c--)
diff --git a/wtf8.h b/wtf8.h
index fbfff34..64ac8a1 100644
--- a/wtf8.h
+++ b/wtf8.h
@@ -1,2 +1,4 @@
 #include <stdio.h>
 #include <stdlib.h>
+
+int is_utf8_cont(char);