xref: /illumos-gate/usr/src/contrib/ast/src/lib/libast/string/strdup.c (revision 8226594fdd4479be135127f43632f1f995074654)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2012 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                 Eclipse Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *          http://www.eclipse.org/org/documents/epl-v10.html           *
11 *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *                 Glenn Fowler <gsf@research.att.com>                  *
18 *                  David Korn <dgk@research.att.com>                   *
19 *                   Phong Vo <kpv@research.att.com>                    *
20 *                                                                      *
21 ***********************************************************************/
22 #pragma prototyped
23 
24 #undef	VMDEBUG
25 #define	VMDEBUG		0
26 
27 #if defined(_MSVCRT_H)
28 #if defined(__STDPP__directive) && defined(__STDPP__hide)
29 __STDPP__directive pragma pp:hide strdup
30 #else
31 #define strdup		______strdup
32 #endif
33 #endif
34 
35 #include <ast.h>
36 
37 #if defined(_MSVCRT_H)
38 #if defined(__STDPP__directive) && defined(__STDPP__hide)
39 __STDPP__directive pragma pp:nohide strdup
40 #else
41 #undef	strdup
42 #endif
43 #endif
44 
45 /*
46  * return a copy of s using malloc
47  */
48 
49 #if defined(__EXPORT__)
50 #define extern	__EXPORT__
51 #endif
52 
53 extern char*
54 strdup(register const char* s)
55 {
56 	register char*	t;
57 	register int	n;
58 
59 	return (s && (t = oldof(0, char, n = strlen(s) + 1, 0))) ? (char*)memcpy(t, s, n) : (char*)0;
60 }
61