1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)strdup.3 8.1 (Berkeley) 6/9/93 33.\" $FreeBSD: src/lib/libc/string/strdup.3,v 1.7.2.2 2001/12/14 18:33:59 ru Exp $ 34.\" $DragonFly: src/lib/libc/string/strdup.3,v 1.5 2004/12/26 12:37:08 swildner Exp $ 35.\" 36.Dd June 9, 1993 37.Dt STRDUP 3 38.Os 39.Sh NAME 40.Nm strdup 41.Nd save a copy of a string 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In string.h 46.Ft char * 47.Fn strdup "const char *str" 48.Sh DESCRIPTION 49The 50.Fn strdup 51function 52allocates sufficient memory for a copy 53of the string 54.Fa str , 55does the copy, and returns a pointer to it. 56The pointer may subsequently be used as an 57argument to the function 58.Xr free 3 . 59.Pp 60If insufficient memory is available, NULL is returned. 61.Sh ERRORS 62The 63.Nm 64function may fail if: 65.Bl -tag -width Er 66.It Bq Er ENOMEM 67No memory could be allocated for the copy of the string. 68.El 69.Sh SEE ALSO 70.Xr free 3 , 71.Xr malloc 3 72.Sh STANDARDS 73The 74.Nm 75function conforms to 76.St -p1003.1-2004 . 77.Sh HISTORY 78The 79.Fn strdup 80function first appeared in 81.Bx 4.4 . 82