From 883574d2d4f590eb212cf1321c9982e5ba2ce7c8 Mon Sep 17 00:00:00 2001
From: oliskoli <oliskoli@f51c46e8-681c-474f-0cfe-069cfd0219fb>
Date: Mon, 23 Jun 2008 18:58:11 +0000
Subject: [PATCH] util: Add bit manipulation functions getbit and setbit.

---
 gpsbabel/defs.h |  5 +++++
 gpsbabel/util.c | 22 ++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/gpsbabel/defs.h b/gpsbabel/defs.h
index 40b487eef..701259239 100644
--- a/gpsbabel/defs.h
+++ b/gpsbabel/defs.h
@@ -930,6 +930,11 @@ typedef enum {
 #define DATUM_OSGB36	86
 #define DATUM_WGS84	118
 
+/* bit manipulation functions (util.c) */
+
+char getbit(const void *buf, const gbuint32 nr);
+void setbit(void *buf, const gbuint32 nr);
+
 /*
  *  From parse.c
  */
diff --git a/gpsbabel/util.c b/gpsbabel/util.c
index 41286af81..58600aff2 100644
--- a/gpsbabel/util.c
+++ b/gpsbabel/util.c
@@ -1736,3 +1736,25 @@ char *get_filename(const char *fname)
 	
 	return (res == NULL) ? (char *) fname : ++res;
 }
+
+/* bit manipulation functions */
+
+/*
+ * setbit: Set bit number [nr] of buffer [buf]
+ */
+void setbit(void *buf, const gbuint32 nr)
+{
+	unsigned char *bytes = buf;
+	bytes[nr / 8] |= (1 << (nr % 8));
+}
+
+/*
+ * setbit: Get state of bit number [nr] of buffer [buf]
+ */
+char getbit(const void *buf, const gbuint32 nr)
+{
+	const unsigned char *bytes = buf;
+	return (bytes[nr / 8] & (1 << (nr % 8)));
+	
+}
+
-- 
2.30.2