strlen - calculate the length of a string
#include <string.h>
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).
| Interface |
Attribute |
Value |
| strlen () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008, C89, C99, C11, SVr4, 4.3BSD.
string(3),
strnlen(3),
wcslen(3),
wcsnlen(3)