1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
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#if defined(__STDPP__directive) && defined(__STDPP__hide)
25__STDPP__directive pragma pp:hide strstr
26#else
27#define strstr		______strstr
28#endif
29
30#include <ast.h>
31
32#if defined(__STDPP__directive) && defined(__STDPP__hide)
33__STDPP__directive pragma pp:nohide strstr
34#else
35#undef	strstr
36#endif
37
38#if _lib_strstr
39
40NoN(strstr)
41
42#else
43
44#if defined(__EXPORT__)
45#define extern	__EXPORT__
46#endif
47
48extern char*
49strstr(register const char* s1, register const char* s2)
50{
51	register int		c1;
52	register int		c2;
53	register const char*	t1;
54	register const char*	t2;
55
56	if (s2)
57	{
58		if (!*s2)
59			return (char*)s1;
60		c2 = *s2++;
61		while (c1 = *s1++)
62			if (c1 == c2)
63			{
64				t1 = s1;
65				t2 = s2;
66				do
67				{
68					if (!*t2)
69						return (char*)s1 - 1;
70				} while (*t1++ == *t2++);
71			}
72	}
73	return 0;
74}
75
76#endif
77