2 files changed, 56 insertions, 0 deletions
diff --git a/rushs/evalexpr/null_terminated_arrays/null_terminated_arrays.c b/rushs/evalexpr/null_terminated_arrays/null_terminated_arrays.c
new file mode 100644
index 0000000..32d2a17
--- /dev/null
+++ b/rushs/evalexpr/null_terminated_arrays/null_terminated_arrays.c
@@ -0,0 +1,50 @@
+#include "null_terminated_arrays.h"
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdio.h>
+
+void reverse_array(const char **arr)
+{
+    const char **p;
+    for (p = arr; *p; p++)
+    {
+        continue;
+    }
+    p--;
+
+    while (p > arr)
+    {
+        const char *tmp = *p;
+        *p = *arr;
+        *arr = tmp;
+        arr++;
+        p--;
+    }
+}
+
+void reverse_matrix(const char ***matrix)
+{
+    const char ***p;
+    for (p = matrix; *p; p++)
+    {
+        continue;
+    }
+    p--;
+
+    while (p > matrix)
+    {
+        reverse_array(*p);
+        reverse_array(*matrix);
+        const char **tmp = *p;
+        *p = *matrix;
+        *matrix = tmp;
+        matrix++;
+        p--;
+    }
+
+    if (p == matrix)
+    {
+        reverse_array(*matrix);
+    }
+}
diff --git a/rushs/evalexpr/null_terminated_arrays/null_terminated_arrays.h b/rushs/evalexpr/null_terminated_arrays/null_terminated_arrays.h
new file mode 100644
index 0000000..31fccc5
--- /dev/null
+++ b/rushs/evalexpr/null_terminated_arrays/null_terminated_arrays.h
@@ -0,0 +1,6 @@
+#ifndef NULL_TERMINATED_ARRAYS_H_
+#define NULL_TERMINATED_ARRAYS_H_
+
+void reverse_matrix(const char ***matrix);
+
+#endif /* !NULL_TERMINATED_ARRAYS_H_ */