Originální popis anglicky:
strlen - calculate the length of a string
Návod, kniha: Linux Programmer's Manual
#include <string.h>
size_t strlen(const char *s);
The
strlen() function calculates the length of the string
s, not
including the terminating `\0' character.
The
strlen() function returns the number of characters in
s.
SVID 3, POSIX, BSD 4.3, ISO 9899
string(3)