'\" t
.\" Copyright 1993, David Metcalfe <david@prism.demon.co.uk>
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH strndupa 3 2026-08-17 "Linux man-pages 6.19"
.SH NAME
strndupa \- nonstring duplicate-into-string using-alloca
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#define _GNU_SOURCE" "  /* See feature_test_macros(7) */"
.BR #include\~<string.h> "  // see memory.h(3head)"
.P
.BR "char *strndupa(" "size_t n;"
.BI "              const char " strn [ n "], size_t " n );
.fi
.SH DESCRIPTION
.BR strndupa ()
is similar to
.BR strndup (3),
but uses
.BR alloca (3)
to allocate the buffer.
.P
It is equivalent to
.P
.in +4n
.EX
strncat(strcpy(alloca(n + 1), ""), strn, n)
.EE
.in
.SH RETURN VALUE
On success,
this macro returns
a pointer to the duplicated string.
.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 strndupa ()
T}	Thread safety	MT-Safe
.TE
.SH STANDARDS
GNU.
.SH HISTORY
GNU.
.SH SEE ALSO
.BR memory.h (3head),
.BR alloca (3),
.BR strndup (3)