1 files changed, 40 insertions, 0 deletions
diff --git a/strtod.c b/strtod.c
new file mode 100644
index 0000000..ef931d4
--- /dev/null
+++ b/strtod.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <math.h>
+
+/* r = place to store result
+ * f = function call to test (or any expression)
+ * x = expected result
+ * m = message to print on failure (with formats for r & x)
+**/
+
+#define TEST(r, f, x, m) ( \
+msg = #f, ((r) = (f)) == (x) || \
+(printf(__FILE__ ":%d: %s failed (" m ")\n", __LINE__, #f, r, x, r-x), err++, 0) )
+
+#define TEST2(r, f, x, m) ( \
+((r) = (f)) == (x) || \
+(printf(__FILE__ ":%d: %s failed (" m ")\n", __LINE__, msg, r, x), err++, 0) )
+
+int test_strtod(void)
+{
+	int i;
+	double d, d2;
+	char buf[1000];
+	char *msg="";
+	int err=0;
+	char *s, *c;
+
+	for (i=0; i<100; i++) {
+		d = sin(i);
+		snprintf(buf, sizeof buf, "%.300f", d);
+		TEST(d2, strtod(buf, 0), d, "round trip fail %a != %a (%a)");
+	}
+
+	TEST(d, strtod("0x1p4", 0), 16.0, "hex float %a != %a");
+	TEST(d, strtod("0x1.1p4", 0), 17.0, "hex float %a != %a");
+
+	return err;
+}