stage 4 (incomplete).front

1 files changed, 46 insertions, 0 deletions

diff --git a/s4/builtin.c b/s4/builtin.c
new file mode 100644
index 0000000..e9208cf
--- /dev/null
+++ b/s4/builtin.c
@@ -0,0 +1,46 @@
+#include <u.h>
+#include <libc.h>
+#include "dat.h"
+#include "fns.h"
+#include "y.tab.h"
+
+static Const consts[] = {
+	"π",	3.14159265358979323846,
+	"e",	2.71828182845904523536,
+	"γ",	0.57721566490153286060,
+	"DEG",	57.29577951308232087680,
+	"Φ",	1.61803398874989484820,
+};
+
+static Builtin builtins[] = {
+	"sin",		sin,
+	"cos",		cos,
+	"atan",		atan,
+	"atan2",	atan2,
+	"log",		log,
+	"log10",	log10,
+	"exp",		exp,
+	"sqrt",		sqrt,
+	"int",		round,
+	"abs",		fabs,
+};
+
+double
+round(double n)
+{
+	return floor(n + 0.5);
+}
+
+void
+init(void)
+{
+	Symbol *s;
+	int i;
+
+	for(i = 0; i < nelem(consts); i++)
+		install(consts[i].name, CONST, consts[i].val);
+	for(i = 0; i < nelem(builtins); i++){
+		s = install(builtins[i].name, BLTIN, 0);
+		s->u.fn = builtins[i].fn;
+	}
+}