Ubuntu manuals

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NAME

       strnlen_user - Get the size of a string in user space.

SYNOPSIS

       long strnlen_user  (const char __user * s, long n);

ARGUMENTS

       s      The string to measure.

       n      The maximum valid length

DESCRIPTION

       Get the size of a NUL-terminated string in user space.

       Returns  the  size  of  the  string  INCLUDING  the terminating NUL. On
       exception, returns 0. If the  string  is  too  long,  returns  a  value
       greater than n.