Add a function to test indianness of the platform

src/littlebigman.c

@@ -0,0 +1,20 @@
+/*
+ * littlebigman.c
+ *
+ *  Created on: 23 mai 2015
+ *      Author: coissac
+ */
+
+#include <littlebigman.h>
+
+bool islittlend()
+{
+    union { int entier;
+            char caractere[4] ;
+    } test;
+
+    test.entier=0x01020304;
+
+    return (test.caractere[3] == 1);
+}
+

src/littlebigman.h

@@ -0,0 +1,54 @@
+/*
+ * littlebigman.h
+ *
+ *  Created on: 23 mai 2015
+ *      Author: coissac
+ */
+
+#ifndef LITTLEBIGMAN_H_
+#define LITTLEBIGMAN_H_
+
+#include <stdbool.h>
+
+/**
+ * Test is the architecture of the processor is little endian.
+ *
+ * ##Two classes of CPU architecture can be define:
+ * 		- little endian
+ * 		- big endian
+ *
+ * 	They describe the way the processor store multi-byte values
+ * 	in memory. Considering an 32 bits integer value encoded in
+ * 	hexadecimal `0x11223344`. This value needs four bytes to be
+ * 	stored. These for bytes will have consecutive addresses in memory.
+ * 	Let says that these addresses will be : 01, 02, 03, and 04
+ *
+ * 	###A big endian architecture will store our integer with the following schema:
+ *
+ *	     Address |   01 |   02 |   03 |   04
+ *	    ---------|------|------|------|------
+ *       value   | Ox11 | Ox22 | 0x33 | 0x44
+ *
+ *  In this architecture the last address (the end of the representation) is
+ *  used to store the byte of higher weight (BIG ENDian)
+ *
+ * 	###A little endian architecture will store our integer with the following schema:
+ *
+ *	     Address |   01 |   02 |   03 |   04
+ *	    ---------|------|------|------|------
+ *       value   | Ox44 | Ox33 | 0x22 | 0x11
+ *
+ *  In this architecture the last address is
+ *  used to store the byte of lighter weight (LITTLE ENDian)
+ *
+ * @return a `bool` value:
+ * 		- `true`  if the architecture is little endian
+ * 		- `false` if the architecture is big endian
+ *
+ * 	@author Eric Coissac (coissac)
+ * 	@created on 23/05/2015
+ */
+bool islittlend();
+
+
+#endif /* LITTLEBIGMAN_H_ */