DOKK / manpages / debian 10 / libowfat-dev / str_len.3.en
str_len(3) Library Functions Manual str_len(3)

str_len - find length of ASCIIZ string

#include <str.h>

size_t str_len(const char* string);

str_len returns the index of the first occurrance of \0 in string.

strlen(3)