2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
220 lines
4.9 KiB
Groff
220 lines
4.9 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Chris Torek and the American National Standards Committee X3,
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.\" on Information Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)strcpy.3 8.1 (Berkeley) 6/4/93
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.\" $NetBSD: strcpy.3,v 1.20 2009/05/02 09:37:32 wiz Exp $
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.\"
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.Dd May 1, 2009
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.Dt STRCPY 3
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.Os
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.Sh NAME
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.Nm stpcpy ,
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.Nm stpncpy ,
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.Nm strcpy ,
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.Nm strncpy
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.Nd copy strings
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In string.h
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.Ft char *
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.Fn stpcpy "char * restrict dst" "const char * restrict src"
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.Ft char *
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.Fn stpncpy "char * restrict dst" "const char * restrict src" "size_t len"
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.Ft char *
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.Fn strcpy "char * restrict dst" "const char * restrict src"
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.Ft char *
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.Fn strncpy "char * restrict dst" "const char * restrict src" "size_t len"
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.Sh DESCRIPTION
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The
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.Fn stpcpy
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and
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.Fn strcpy
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functions
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copy the string
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.Fa src
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to
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.Fa dst
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(including the terminating
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.Ql \e0
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character).
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.Pp
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The
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.Fn stpncpy
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and
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.Fn strncpy
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functions copy at most
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.Fa len
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characters from
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.Fa src
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into
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.Fa dst .
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If
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.Fa src
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is less than
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.Fa len
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characters long,
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the remainder of
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.Fa dst
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is filled with
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.Ql \e0
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characters.
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Otherwise,
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.Fa dst
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is
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.Em not
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terminated.
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.Sh RETURN VALUES
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The
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.Fn strcpy
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and
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.Fn strncpy
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functions
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return
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.Fa dst .
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The
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.Fn stpcpy
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and
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.Fn stpncpy
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functions return a pointer to the terminating
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.Ql \e0
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character of
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.Fa dst .
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If
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.Fn stpncpy
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does not terminate
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.Fa dst
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with a
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.Dv NUL
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character, it instead returns a pointer to
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.Li dst[len]
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(which does not necessarily refer to a valid memory location.)
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.Sh EXAMPLES
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The following sets
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.Va chararray
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to
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.Dq Li abc\e0\e0\e0 :
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.Bd -literal -offset indent
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char chararray[6];
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(void)strncpy(chararray, "abc", sizeof(chararray));
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.Ed
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.Pp
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The following sets
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.Va chararray
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to
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.Dq Li abcdef :
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.Bd -literal -offset indent
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char chararray[6];
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(void)strncpy(chararray, "abcdefgh", sizeof(chararray));
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.Ed
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.Pp
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Note that it does
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.Em not
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.Dv NUL Ns No -terminate
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.Va chararray
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because the length of the source string is greater than or equal
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to the length parameter.
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.Fn strncpy
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.Em only
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.Dv NUL Ns No -terminates
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the destination string when the length of the source
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string is less than the length parameter.
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.Pp
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The following copies as many characters from
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.Va input
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to
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.Va buf
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as will fit and
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.Dv NUL Ns No -terminates
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the result.
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Because
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.Fn strncpy
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does
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.Em not
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guarantee to
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.Dv NUL Ns No -terminate
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the string itself, this must be done explicitly.
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.Bd -literal -offset indent
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char buf[1024];
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(void)strncpy(buf, input, sizeof(buf) - 1);
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buf[sizeof(buf) - 1] = '\e0';
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.Ed
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.Pp
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This could be better and more simply achieved using
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.Xr strlcpy 3 ,
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as shown in the following example:
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.Bd -literal -offset indent
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(void)strlcpy(buf, input, sizeof(buf));
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.Ed
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.Pp
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Note that because
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.Xr strlcpy 3
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is not defined in any standards, it should
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only be used when portability is not a concern.
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.Sh SEE ALSO
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.Xr bcopy 3 ,
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.Xr memccpy 3 ,
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.Xr memcpy 3 ,
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.Xr memmove 3 ,
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.Xr strlcpy 3 ,
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.Xr wcscpy 3
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.Sh STANDARDS
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The
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.Fn strcpy
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and
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.Fn strncpy
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functions
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conform to
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.St -isoC-99 .
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The
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.Fn stpcpy
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and
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.Fn stpncpy
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functions conform to
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.St -p1003.1-2008 .
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.Sh HISTORY
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The
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.Fn stpcpy
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and
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.Fn stpncpy
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functions first appeared in
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.Nx 6.0 .
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.Sh SECURITY CONSIDERATIONS
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The
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.Fn strcpy
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and
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.Fn stpcpy
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functions are easily misused in a manner which enables malicious users
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to arbitrarily change a running program's functionality through a
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buffer overflow attack.
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