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STRLEN(3) FreeBSD Library Functions Manual STRLEN(3)
NAME
strlen, strnlen - find length of string
LIBRARY
Standard C Library (libc, -lc)
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 attempts to compute the length of s, but never scans beyond the
first maxlen bytes of s.
RETURN VALUES
The strlen() function returns the number of characters that precede the
terminating NUL character. The strnlen() function returns either the
same result as strlen() or maxlen, whichever is smaller.
SEE ALSO
string(3), wcslen(3), wcswidth(3)
STANDARDS
The strlen() function conforms to ISO/IEC 9899:1990 ("ISO C90"). The
strnlen() function conforms to IEEE Std 1003.1-2008 ("POSIX.1").
HISTORY
The strlen() function first appeared in the Programmer's Workbench
(PWB/UNIX) and was ported to Version 7 AT&T UNIX. The strnlen()
FreeBSD 14.0-RELEASE-p6 April 3, 2022 FreeBSD 14.0-RELEASE-p6