strlen - calculate the length of a string

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ strlen()                                                                    │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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

       POSIX.1-2001, C89, SVr4, 4.3BSD.

       Standard C library (libc, -lc)

       strlen - calculate the length of a string

       In  cases  where  the  input  buffer  may  not contain a terminating null byte, strnlen(3) should be used
       instead.

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

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

Linux man-pages 6.9.1                              2024-06-15                                          strlen(3)

       C11, POSIX.1-2008.

#include<string.h>size_tstrlen(constchar*s);