strlen - calculate the length of a string

NAME  LIBRARY  SYNOPSIS  DESCRIPTION  RETURN VALUE  ATTRIBUTES  STANDARDS  HISTORY  NOTES  SEE ALSO 

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NAME

strlen − calculate the length of a string

LIBRARY

Standard C library (libc, −lc)

SYNOPSIS

#include <string.h>

size_t strlen(const char *s);

DESCRIPTION

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

RETURN VALUE

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

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

STANDARDS

C11, POSIX.1-2008.

HISTORY

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

NOTES

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

SEE ALSO

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

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