strstr.c revision 3e14f97f673e8a630f076077de35afdd43dc1587
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:hide strstr
#else
#define strstr ______strstr
#endif
#include <ast.h>
#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:nohide strstr
#else
#undef strstr
#endif
#if _lib_strstr
NoN(strstr)
#else
#if defined(__EXPORT__)
#define extern __EXPORT__
#endif
extern char*
strstr(register const char* s1, register const char* s2)
{
register int c1;
register int c2;
register const char* t1;
register const char* t2;
if (s2)
{
if (!*s2)
return (char*)s1;
c2 = *s2++;
while (c1 = *s1++)
if (c1 == c2)
{
t1 = s1;
t2 = s2;
do
{
if (!*t2)
return (char*)s1 - 1;
} while (*t1++ == *t2++);
}
}
return 0;
}
#endif