include: Add sysfs_helpers.h

include/linux/sysfs_helpers.h

@@ -0,0 +1,53 @@
+/*  Sysfs helper functions
+ *
+ *  Author: Andrei F. <luxneb@gmail.com>
+ *  Derived from function implementation from Gokhan Moral
+ *
+ *  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, or (at your option)
+ *  any later version.
+ */
+
+static inline int read_into(int *container, int size, const char *buf, size_t count)
+{
+	int i, j, t, n;
+	i=0; j=0; t=0; n=0;
+
+	for(j = 0; j < size; j++)
+		*(container + j) = 0;
+
+	for(j = 0; i < count; i++) {
+		char c = buf[i];
+		if(c >= '0' && c <= '9') {
+			if(t < (j + 1))
+				t = j + 1;
+			if(t > size)
+				return -EINVAL;
+			*(container + j) *= 10;
+			*(container + j) += (c - '0');
+		} else if(c == ' ' || c == '\t' || c == '\n' ) {
+			if(*(container + j) != 0) {
+				if(n) {
+					*(container + j) *= -1;
+					n = 0;
+				}
+				j++;
+			}
+		} else if(c == '-') {
+			n = 1;
+		} else
+			break;
+	}
+
+	if(n)
+		*(container + j) *= -1;
+
+	return t;
+}
+
+#define sanitize_min_max(val, min, max)		\
+	if(val < min)				\
+		val = min;			\
+	if(val > max)				\
+		val = max;