strlen (3)

#include <string.h>

size_t strlen(const char *s);

The strlen() function calculates the length of the string s, excluding the terminating null byte ('\0').

The strlen() function returns the number of bytes in the string s.

Multithreading (see pthreads(7))

The strlen() function is thread-safe.

SVr4, 4.3BSD, C89, C99.

string(3), strnlen(3), wcslen(3), wcsnlen(3)

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