NAME
strict_strtol - convert a string to a long strictly
SYNOPSIS
int strict_strtol(const char * cp, unsigned int base, long * res);
ARGUMENTS
cp
The string to be converted
base
The number base to use
res
The converted result value
DESCRIPTION
strict_strtol is similiar to strict_strtoul, but it allows the first character of a string is '-'.
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.