strlen - calculate the length of a string
size_t strlen(const char *s);
The strlen() function calculates the length of the string pointed to by s, excluding the terminating null byte ('\0').
The strlen() function returns the number of bytes in the string pointed to by s.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C89, C99, C11, SVr4, 4.3BSD.
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