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Command: strlen | Section: 3 | Source: OpenBSD | File: strlen.3
STRLEN(3) FreeBSD Library Functions Manual STRLEN(3)
NAME
strlen, strnlen - find length of a string
SYNOPSIS
#include <string.h>
size_t
strlen(const char *s);
size_t
strnlen(const char *s, size_t maxlen);
DESCRIPTION
The strlen() function computes the length of the string s.
The strnlen() function computes the length of the string s, up to maxlen
characters. The strnlen() function will never attempt to address more
than maxlen characters, making it suitable for use with character arrays
that are not guaranteed to be NUL-terminated.
RETURN VALUES
The strlen() function returns the number of characters that precede the
terminating NUL character.
The strnlen() function returns the number of characters that precede the
terminating NUL or maxlen, whichever is smaller.
SEE ALSO
wcslen(3)
STANDARDS
The strlen() function conforms to ANSI X3.159-1989 ("ANSI C89").
The strlen() and strnlen() functions conform to IEEE Std 1003.1-2008
("POSIX.1").
HISTORY
The strlen() function first appeared in Version 6 AT&T UNIX. The
strnlen() function appeared in glibc 2.0 and was reimplemented for
OpenBSD 4.8.
FreeBSD 14.1-RELEASE-p8 July 31, 2022 FreeBSD 14.1-RELEASE-p8