\" Copyright (c) 1990, 1991, 1993
\"      The Regents of the University of California.  All rights reserved.
\"
\" This code is derived from software contributed to Berkeley by
\" Chris Torek and the American National Standards Committee X3,
\" on Information Processing Systems.
\"
\" Redistribution and use in source and binary forms, with or without
\" modification, are permitted provided that the following conditions
\" are met:
\" 1. Redistributions of source code must retain the above copyright
\"    notice, this list of conditions and the following disclaimer.
\" 2. Redistributions in binary form must reproduce the above copyright
\"    notice, this list of conditions and the following disclaimer in the
\"    documentation and/or other materials provided with the distribution.
\" 3. Neither the name of the University nor the names of its contributors
\"    may be used to endorse or promote products derived from this software
\"    without specific prior written permission.
\"
\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
\" SUCH DAMAGE.
\"
\"     from: @(#)strcpy.3       8.1 (Berkeley) 6/4/93
\"      $NetBSD: strcpy.3,v 1.27 2023/08/11 21:17:16 riastradh Exp $
\"
Dd August 11, 2023
Dt STRCPY 3
Os
Sh NAME
Nm stpcpy ,
Nm strcpy
Nd copy strings
Sh LIBRARY
Lb libc
Sh SYNOPSIS
In string.h
Ft char *
Fn stpcpy "char * restrict dst" "const char * restrict src"
Ft char *
Fn strcpy "char * restrict dst" "const char * restrict src"
Sh DESCRIPTION
The
Fn stpcpy
and
Fn strcpy
functions
copy the string
Fa src
to
Fa dst ,
including the terminating
Tn NUL
byte.
Pp
The strings
Fa src
and
Fa dst
may not overlap.
The string
Fa src
must be terminated by a
Tn NUL
byte.
The memory for
Fa dst
must have space for
Fn strlen src Li "+ 1"
bytes.
Sh RETURN VALUES
The
Fn strcpy
function returns
Fa dst .
Pp
The
Fn stpcpy
function returns a pointer to the terminating
Tn NUL
byte of
Fa dst .
Sh SEE ALSO
Xr bcopy 3 ,
Xr memccpy 3 ,
Xr memcpy 3 ,
Xr memmove 3 ,
Xr strlcpy 3 ,
Xr strncpy 3 ,
Xr wcscpy 3
Sh STANDARDS
The
Fn strcpy
function conforms to
St -isoC-99 .
Pp
The
Fn stpcpy
function conforms to
St -p1003.1-2008 .
Sh HISTORY
The
Fn stpcpy
function first appeared in
Nx 6.0 .
Sh SECURITY CONSIDERATIONS
The
Fn strcpy
and
Fn stpcpy
functions copy until a
Tn NUL
terminator without any bounds checks on the size of the input or output
buffers.
If the input buffer is missing a
Tn NUL
terminator, or the input string is longer than the output buffer, this
can lead to crashes or security vulnerabilities from buffer overruns,
including disclosure of secrets in memory and arbitrary code
execution.
Pp
The
Xr strlcpy 3
function is a safer replacement for
Fn strcpy
which allows the caller to specify the space allocated for
Fa dst .
Xr strlcpy 3 ,
or
Xr snprintf 3
with a format string of
Li \*q%s\*q ,
should be used instead of
Fn strcpy
and
Fn stpcpy
wherever possible to avoid buffer overruns in
Fa dst .
Po
However, they still require
Fa src
to be
Tn NUL Ns -terminated .
Pc

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.