1 files changed, 57 insertions, 0 deletions

diff --git a/firmware/libc/atoi.c b/firmware/libc/atoi.c
new file mode 100644
index 0000000000..3393839b27
--- /dev/null
+++ b/firmware/libc/atoi.c
@@ -0,0 +1,57 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Gary Czvitkovicz
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdlib.h>
+#include "ctype.h"
+
+int atoi (const char *str)
+{
+    int value = 0;
+    int sign = 1;
+    
+    while (isspace(*str))
+    {
+        str++;
+    }
+    
+    if ('-' == *str)
+    {
+        sign = -1;
+        str++;
+    }
+    else if ('+' == *str)
+    {
+        str++;
+    }
+    
+    while ('0' == *str)
+    {
+        str++;
+    }
+
+    while (isdigit(*str))
+    {
+        value = (value * 10) + (*str - '0');
+        str++;
+    }
+    
+    return value * sign;
+}