mirror of https://github.com/mkerrisk/man-pages
79 lines
2.3 KiB
Groff
79 lines
2.3 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 18:02:26 1993 by Rik Faith (faith@cs.unc.edu)
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.TH STRLEN 3 2021-08-27 "GNU" "Linux Programmer's Manual"
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.SH NAME
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strlen \- calculate the length of a string
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.SH SYNOPSIS
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.nf
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.B #include <string.h>
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.PP
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.BI "size_t strlen(const char *" s );
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.fi
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.SH DESCRIPTION
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The
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.BR strlen ()
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function calculates the length of the string pointed to by
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.IR s ,
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excluding the terminating null byte (\(aq\e0\(aq).
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.SH RETURN VALUE
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The
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.BR strlen ()
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function returns the number of bytes in the string pointed to by
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.IR s .
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.nh
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.TS
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allbox;
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lbx lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR strlen ()
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T} Thread safety MT-Safe
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.TE
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.hy
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.ad
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.sp 1
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.SH CONFORMING TO
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POSIX.1-2001, POSIX.1-2008, C89, C99, C11, SVr4, 4.3BSD.
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.SH NOTES
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In cases where the input buffer may not contain
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a terminating null byte,
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.BR strnlen (3)
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should be used instead.
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.SH SEE ALSO
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.BR string (3),
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.BR strnlen (3),
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.BR wcslen (3),
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.BR wcsnlen (3)
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