Man page - strlen(3)

Packages contains this manual

Package: manpages-dev
apt-get install manpages-dev

Manuals in package:

en fr pt_BR es pl ko ja ru ro de

strlen - calculate the length of a string

Standard C library ( libc , -lc )

#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).

Image grohtml-145803-1.png

C11, POSIX.1-2008.

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

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