vsprintf: add ustrtoll function

Add 'ustrtoull' function to convert size from string (ex: 1GiB)
to unsigned long long type

Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

include/exports.h

@@ -24,6 +24,7 @@ int setenv (const char *varname, const char *varvalue);
 long simple_strtol(const char *cp,char **endp,unsigned int base);
 int strcmp(const char * cs,const char * ct);
 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base);
+unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base);
 #if defined(CONFIG_CMD_I2C)
 int i2c_write (uchar, uint, int , uchar* , int);
 int i2c_read (uchar, uint, int , uchar* , int);

lib/vsprintf.c

@@ -126,6 +126,29 @@ unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
 	return result;
 }
 
+unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base)
+{
+	unsigned long long result = simple_strtoull(cp, endp, base);
+	switch (**endp) {
+	case 'G':
+		result *= 1024;
+		/* fall through */
+	case 'M':
+		result *= 1024;
+		/* fall through */
+	case 'K':
+	case 'k':
+		result *= 1024;
+		if ((*endp)[1] == 'i') {
+			if ((*endp)[2] == 'B')
+				(*endp) += 3;
+			else
+				(*endp) += 2;
+		}
+	}
+	return result;
+}
+
 unsigned long long simple_strtoull(const char *cp, char **endp,
 					unsigned int base)
 {