[PATCH 04/11] include support for a simple pseudo number generator

[Sascha Hauer <s.hauer@pengutronix.de>]

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 include/random.h |    7 +++++++
 lib/Makefile     |    1 +
 lib/random.c     |   22 ++++++++++++++++++++++
 3 files changed, 30 insertions(+), 0 deletions(-)
 create mode 100644 include/random.h
 create mode 100644 lib/random.c

diff --git a/include/random.h b/include/random.h
new file mode 100644
index 0000000..29911d8
--- /dev/null
+++ b/include/random.h
@@ -0,0 +1,7 @@
+#ifndef __RANDOM_H
+#define __RANDOM_H
+
+void get_random_bytes(char *buf, int len);
+void srand(unsigned int);
+
+#endif /* __RANDOM_H */
diff --git a/lib/Makefile b/lib/Makefile
index b072fb6..4a33aaa 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o
 obj-y			+= glob.o
 obj-y			+= notifier.o
 obj-y			+= copy_file.o
+obj-y			+= random.o
 obj-y			+= lzo/
 obj-$(CONFIG_LZO_DECOMPRESS)		+= decompress_unlzo.o
 obj-$(CONFIG_PROCESS_ESCAPE_SEQUENCE)	+= process_escape_sequence.o
diff --git a/lib/random.c b/lib/random.c
new file mode 100644
index 0000000..25315e7
--- /dev/null
+++ b/lib/random.c
@@ -0,0 +1,22 @@
+#include <common.h>
+#include <random.h>
+
+static int random_seed;
+
+static unsigned char rand(void)
+{
+	random_seed = random_seed * 1103515245 + 12345;
+	return (unsigned char)(random_seed / 65536) % 256;
+}
+
+void srand(unsigned int seed)
+{
+	random_seed = seed;
+}
+
+void get_random_bytes(char *buf, int len)
+{
+	while (len--)
+		*buf++ = rand();
+}
+
-- 
1.7.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox