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.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH strnul 3 2026-02-25 "Linux man-pages 6.18"
.SH NAME
strnul \- string search NUL
.SH LIBRARY
gnulib \- The GNU Portability Library
.SH SYNOPSIS
.nf
.B #include <string.h>
.P
.BI char\~*strnul(char\~* s );
.BI const\~char\~*strnul(const\~char\~* s );
.fi
.SH DESCRIPTION
.BR strnul ()
calculates the position of the terminating null byte (\[aq]\[rs]0\[aq])
in the string pointed to by
.IR s .
.P
It is equivalent to both of the following expressions:
.P
.in +4n
.EX
s + strlen(s)
strchr(s, \[aq]\[rs]0\[aq])
.EE
.in
.SH RETURN VALUE
.BR strnul ()
returns a pointer to the terminating null byte
in the string pointed to by
.IR s .
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.na
.nh
.BR strnul ()
T}	Thread safety	MT-Safe
.TE
.SH STANDARDS
GNU.
.SH HISTORY
gnulib 202607.
.SH SEE ALSO
.BR strlen (3),
.BR strchr (3),
.BR string (3)