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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\" Linux libc source code
-.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\" 386BSD man pages
-.\" Modified Sun Jul 25 10:41:34 1993 by Rik Faith (faith@cs.unc.edu)
-.\" Modified Wed Oct 17 01:12:26 2001 by John Levon <moz@compsoc.man.ac.uk>
-.TH strdup 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-strdup, strndup, strdupa, strndupa \- duplicate a string
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <string.h>
-.P
-.BI "char *strdup(const char *" s );
-.P
-.BI "char *strndup(const char " s [. n "], size_t " n );
-.BI "char *strdupa(const char *" s );
-.BI "char *strndupa(const char " s [. n "], size_t " n );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR strdup ():
-.nf
- _XOPEN_SOURCE >= 500
-.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
- || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
- || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.P
-.BR strndup ():
-.nf
- Since glibc 2.10:
- _POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
- _GNU_SOURCE
-.fi
-.P
-.BR strdupa (),
-.BR strndupa ():
-.nf
- _GNU_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR strdup ()
-function returns a pointer to a new string which
-is a duplicate of the string
-.IR s .
-Memory for the new string is
-obtained with
-.BR malloc (3),
-and can be freed with
-.BR free (3).
-.P
-The
-.BR strndup ()
-function is similar, but copies at most
-.I n
-bytes.
-If
-.I s
-is longer than
-.IR n ,
-only
-.I n
-bytes are copied, and a terminating null byte (\[aq]\e0\[aq]) is added.
-.P
-.BR strdupa ()
-and
-.BR strndupa ()
-are similar, but use
-.BR alloca (3)
-to allocate the buffer.
-.SH RETURN VALUE
-On success, the
-.BR strdup ()
-function returns a pointer to the duplicated
-string.
-It returns NULL if insufficient memory was available, with
-.I errno
-set to indicate the error.
-.SH ERRORS
-.TP
-.B ENOMEM
-Insufficient memory available to allocate duplicate 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 strdup (),
-.BR strndup (),
-.BR strdupa (),
-.BR strndupa ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-.TP
-.BR strdup ()
-.TQ
-.BR strndup ()
-POSIX.1-2008.
-.TP
-.BR strdupa ()
-.TQ
-.BR strndupa ()
-GNU.
-.SH HISTORY
-.TP
-.BR strdup ()
-SVr4, 4.3BSD-Reno, POSIX.1-2001.
-.TP
-.BR strndup ()
-POSIX.1-2008.
-.TP
-.BR strdupa ()
-.TQ
-.BR strndupa ()
-GNU.
-.SH SEE ALSO
-.BR alloca (3),
-.BR calloc (3),
-.BR free (3),
-.BR malloc (3),
-.BR realloc (3),
-.BR string (3),
-.BR wcsdup (3)