strict_strtoul

Name

strict_strtoul — convert a string to an unsigned long strictly

Synopsis

int strict_strtoul (	const char *	cp,
	unsigned int	base,
	unsigned long *	res);

Arguments

cp

The string to be converted

base

The number base to use

res

The converted result value

Description

strict_strtoul converts a string to an unsigned long only if the string is really an unsigned long string, any string containing any invalid char at the tail will be rejected and -EINVAL is returned, only a newline char at the tail is acceptible because people generally

change a module parameter in the following way

echo 1024 > /sys/module/e1000/parameters/copybreak

echo will append a newline to the tail.

It returns 0 if conversion is successful and *res is set to the converted value, otherwise it returns -EINVAL and *res is set to 0.

simple_strtoul just ignores the successive invalid characters and return the converted value of prefix part of the string.