1 .\" Copyright (c) 1990, 1991, 1993
2 .\" The Regents of the University of California. All rights reserved.
4 .\" This code is derived from software contributed to Berkeley by
5 .\" Chris Torek and the American National Standards Committee X3,
6 .\" on Information Processing Systems.
8 .\" Redistribution and use in source and binary forms, with or without
9 .\" modification, are permitted provided that the following conditions
11 .\" 1. Redistributions of source code must retain the above copyright
12 .\" notice, this list of conditions and the following disclaimer.
13 .\" 2. Redistributions in binary form must reproduce the above copyright
14 .\" notice, this list of conditions and the following disclaimer in the
15 .\" documentation and/or other materials provided with the distribution.
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.
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
32 .\" @(#)strcpy.3 8.1 (Berkeley) 6/4/93
46 .Fn stpcpy "char *dst" "const char *src"
48 .Fn strcpy "char * restrict dst" "const char * restrict src"
50 .Fn strncpy "char * restrict dst" "const char * restrict src" "size_t len"
61 (including the terminating
67 function copies at most
98 function returns a pointer to the terminating
106 .Dq Li abc\e0\e0\e0 :
107 .Bd -literal -offset indent
110 (void)strncpy(chararray, "abc", sizeof(chararray));
117 .Bd -literal -offset indent
120 (void)strncpy(chararray, "abcdefgh", sizeof(chararray));
128 because the length of the source string is greater than or equal
129 to the length argument.
131 The following copies as many characters from
137 terminates the result.
144 terminate the string itself, this must be done explicitly.
145 .Bd -literal -offset indent
148 (void)strncpy(buf, input, sizeof(buf) - 1);
149 buf[sizeof(buf) - 1] = '\e0';
152 This could be better achieved using
154 as shown in the following example:
156 .Dl "(void)strlcpy(buf, input, sizeof(buf));"
160 is not defined in any standards, it should
161 only be used when portability is not a concern.
162 .Sh SECURITY CONSIDERATIONS
165 function is easily misused in a manner which enables malicious users
166 to arbitrarily change a running program's functionality through a
167 buffer overflow attack.
188 function is an MS-DOS and GNUism.
192 conforms to no standard.
196 function first appeared in
198 coming from 1998-vintage Linux.