From 83ec8617777cfae75b9486c9d5f96b1ad1e0042c Mon Sep 17 00:00:00 2001
From: Juho Eerola <juho.eerola@tuni.fi>
Date: Mon, 26 Jul 2021 05:03:10 +0300
Subject: [PATCH 1/2] Add NAN check to ncr and fac

Now both `fac` and `ncr` will return NAN, if any argument is NAN.
---
 tinyexpr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
 mode change 100755 => 100644 tinyexpr.c

diff --git a/tinyexpr.c b/tinyexpr.c
old mode 100755
new mode 100644
index a5fc9d8..3877927
--- a/tinyexpr.c
+++ b/tinyexpr.c
@@ -122,7 +122,7 @@ void te_free(te_expr *n) {
 static double pi(void) {return 3.14159265358979323846;}
 static double e(void) {return 2.71828182845904523536;}
 static double fac(double a) {/* simplest version of fac */
-    if (a < 0.0)
+    if (a < 0.0 || isnan(a))
         return NAN;
     if (a > UINT_MAX)
         return INFINITY;
@@ -136,7 +136,7 @@ static double fac(double a) {/* simplest version of fac */
     return (double)result;
 }
 static double ncr(double n, double r) {
-    if (n < 0.0 || r < 0.0 || n < r) return NAN;
+    if (n < 0.0 || r < 0.0 || n < r || isnan(n) || isnan(r)) return NAN;
     if (n > UINT_MAX || r > UINT_MAX) return INFINITY;
     unsigned long int un = (unsigned int)(n), ur = (unsigned int)(r), i;
     unsigned long int result = 1;

From 7fe2a4e597eb9cce09d7f410a4bfc5da76efe60d Mon Sep 17 00:00:00 2001
From: Juho Eerola <juho.eerola@tuni.fi>
Date: Mon, 26 Jul 2021 05:43:08 +0300
Subject: [PATCH 2/2] Add .gitignore

Ignore object files and executables from make targets.

Also added repl-readline to make clean target.
---
 .gitignore | 13 +++++++++++++
 Makefile   |  2 +-
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..043300a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,13 @@
+# binaries from make
+bench
+example
+example2
+example3
+repl
+repl-readline
+smoke
+smoke_pr
+*.exe
+
+# object files
+*.o
diff --git a/Makefile b/Makefile
index d3db7cf..c933ecc 100644
--- a/Makefile
+++ b/Makefile
@@ -40,4 +40,4 @@ repl-readline.o: repl.c
 	$(CC) -c $(CCFLAGS) $< -o $@
 
 clean:
-	rm -f *.o *.exe example example2 example3 bench repl smoke_pr smoke
+	rm -f *.o *.exe example example2 example3 bench repl repl-readline smoke_pr smoke