5.36 strnlen—character string length

Synopsis

#include <string.h>
size_t strnlen(const char *str, size_t n);

Description
The strnlen function works out the length of the string starting at *str by counting chararacters until it reaches a NUL character or the maximum: n number of characters have been inspected.

Returns
strnlen returns the character count or n.

Portability
strnlen is a GNU extension.

strnlen requires no supporting OS subroutines.