Share common macros in util.h

1 files changed, 7 insertions, 0 deletions

diff --git a/util.h b/util.h
new file mode 100644
index 0000000..2992bea
--- /dev/null
+++ b/util.h
@@ -0,0 +1,7 @@
+#define LENGTH(x)  ((int)(sizeof (x) / sizeof *(x)))
+#define MIN(a, b)  ((a) > (b) ? (b) : (a))
+#define MAX(a, b)  ((a) < (b) ? (b) : (a))
+
+/* is c the start of a utf8 sequence? */
+#define isutf8(c) (((c)&0xC0)!=0x80)
+#define ISASCII(ch)   ((unsigned char)ch < 0x80)