From ab2a4f1318814843a7a59779468eb677cf31b344 Mon Sep 17 00:00:00 2001
From: Dale Weiler <killfieldengine@gmail.com>
Date: Sat, 23 Nov 2013 10:31:51 -0500
Subject: [PATCH] Some math constants

---
 ftepp.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/ftepp.c b/ftepp.c
index a34b58c..943411e 100644
--- a/ftepp.c
+++ b/ftepp.c
@@ -1811,11 +1811,29 @@ void ftepp_add_macro(ftepp_t *ftepp, const char *name, const char *value) {
     vec_free  (create);
 }
 
+static const char *ftepp_math_constants[][2] = {
+    { "M_E",        "2.7182818284590452354"  }, /* e          */
+    { "M_LOG2E",    "1.4426950408889634074"  }, /* log_2 e    */
+    { "M_LOG10E",   "0.43429448190325182765" }, /* log_10 e   */
+    { "M_LN2",      "0.69314718055994530942" }, /* log_e 2    */
+    { "M_LN10",     "2.30258509299404568402" }, /* log_e 10   */
+    { "M_PI",       "3.14159265358979323846" }, /* pi         */
+    { "M_PI_2",     "1.57079632679489661923" }, /* pi/2       */
+    { "M_PI_4",     "0.78539816339744830962" }, /* pi/4       */
+    { "M_1_PI",     "0.31830988618379067154" }, /* 1/pi       */
+    { "M_2_PI",     "0.63661977236758134308" }, /* 2/pi       */
+    { "M_2_SQRTPI", "1.12837916709551257390" }, /* 2/sqrt(pi) */
+    { "M_SQRT2",    "1.41421356237309504880" }, /* sqrt(2)    */
+    { "M_SQRT1_2",  "0.70710678118654752440" }, /* 1/sqrt(2)  */
+    { "M_TAU",      "6.28318530717958647692" }  /* pi*2       */
+};
+
 ftepp_t *ftepp_create()
 {
     ftepp_t *ftepp;
     char minor[32];
     char major[32];
+    size_t i;
 
     ftepp = ftepp_new();
     if (!ftepp)
@@ -1865,6 +1883,10 @@ ftepp_t *ftepp_create()
      */
     ftepp_add_macro(ftepp, "__NULL__", "nil");
 
+    /* add all the math constants */
+    for (i = 0; i < GMQCC_ARRAY_COUNT(ftepp_math_constants); i++)
+        ftepp_add_macro(ftepp, ftepp_math_constants[i][0], ftepp_math_constants[i][1]);
+
     return ftepp;
 }
 
-- 
2.39.2