commiting examples

Examples/NeoPixel Example/utility.c

@@ -0,0 +1,68 @@
+#include <ctype.h>
+#include "string_func.h"
+#include "utility.h"
+
+int atoint(const char *a)
+{
+	while (isspace(*a))
+		a++;
+	int sign = 1;
+	if (*a == '-')
+		sign = -1;
+	if (*a == '+' || *a == '-')
+		a++;
+	int i = 0;
+	while (isdigit(*a))
+		i = *a++ - '0' + i*10;
+	return sign*i;
+}
+
+char *inttoa(int i,char *a)
+{
+	char *p = a;
+	do 
+	{
+		*a++ = i % 10 + '0';
+	} while ((i /= 10) > 0);
+	*a = '\0';
+	return reverse(p);
+}
+
+double atofloat(const char *a)
+{
+	while (isspace(*a))
+		a++;
+	int sign = *a == '-' ? -1 : 1;
+	if (*a == '+' || *a == '-')
+		a++;
+	double val = 0.0;
+	while (isdigit(*a))
+		val = *a++ - '0' + val * 10.0;
+	if (*a == '.')
+		a++;
+	double power = 1.0;
+	while (isdigit(*a))
+	{
+		val = *a++ - '0' + val * 10.0;
+		power *= 10.0;
+	}
+	val = sign*val/power;
+	if (*a == 'e' || *a == 'E')
+		a++;
+	sign = *a == '-' ? -1 : 1;
+	if (*a == '+' || *a == '-')
+		a++;
+	int n = 0;
+	while (isdigit(*a))
+		n = *a++ - '0' + n * 10;
+	if (sign == 1)
+		while (n-- > 0)
+			val *= 10.0;
+	else
+		while (n-- > 0)
+			val /= 10.0;
+	return val;
+}
+
+
+