haxstring: Add parenthesis to macro arguments

WRITES(fd, *s) where s is a pointer to a struct string will
not compile, as the macro expands to write(fd, *s.data, *s.len),
which it expects s to be a struct string and attempts to use
s.data and s.len as pointers. This is, of course, erroneous.
The correct expansion is write(fd, (*s).data, (*s).len); while
write(fd, s->data, s->len) is desirable, it is not achievable with
a simple macro expansion. In any case, the parenthesis shall be
added.

1 files changed, 2 insertions, 2 deletions

diff --git a/haxstring.h b/haxstring.h
index 0c72ff3..f0c3947 100644
--- a/haxstring.h
+++ b/haxstring.h
@@ -40,6 +40,6 @@ struct string {
 #define STRING(x) (struct string){x, sizeof(x)-1}
 #define NULSTR(x) (struct string){x, strlen(x)}
 
-#define STRING_EQ(x, y) (x.len == y.len && memcmp(x.data, y.data, x.len) == 0)
+#define STRING_EQ(x, y) ((x).len == (y).len && memcmp((x).data, (y).data, (x).len) == 0)
 
-#define WRITES(x, y) write(x, y.data, y.len)
+#define WRITES(x, y) write((x), (y).data, (y).len)