glibc/sysdeps/generic/strstr.c
Ulrich Drepper c3301189bd Update.
2000-11-26  Ulrich Drepper  <drepper@redhat.com>

	* inet/getnameinfo.c: Adjust casts to avoid warnings.
	* inet/rcmd.c: Likewise.
	* inet/ruserpass.c: Likewise.
	* inet/netinet/in.h (IN6_IS_ADDR_UNSPECIFIED, IN6_IS_ADDR_LOOPBACK,
	IN6_IS_ADDR_MULTICAST, IN6_IS_ADDR_LINKLOCAL, IN6_IS_ADDR_SITELOCAL,
	IN6_IS_ADDR_V4MAPPED, IN6_IS_ADDR_V4COMPAT, IN6_ARE_ADDR_EQUAL,
	IN6_IS_ADDR_MC_NODELOCAL, IN6_IS_ADDR_MC_LINKLOCAL,
	IN6_IS_ADDR_MC_SITELOCAL, IN6_IS_ADDR_MC_ORGLOCAL,
	IN6_IS_ADDR_MC_GLOBAL): Preserve const in cast.
	* include/aliases.h: Add prototypes for internal __getalias* functions.
	* include/netdb.h: Add prototypes for __old_gethostent_r,
	__old_gethostbyaddr_r, __old_gethostbyname_r, __old_gethostbyname2_r,
	__old_getnetent_r, __old_getnetbyaddr_r, __old_getnetbyname_r,
	__old_getservent_r, __old_getservbyname_r, __old_getservbyport_r,
	__old_getprotoent_r, __old_getprotobyname_r, __old_getprotobynumber_r.
	* include/rpc/netdb.h: Add prototypes for __old_getrpcbyname_r,
	__old_getrpcbynumber_r, __old_getrpcent_r.

	* include/rpc/netdb.h: Add __getrpcbyname_r, __getrpcbynumber_r,
	__getrpcent_r prototypes.
2000-11-26 09:44:30 +00:00

128 lines
2.9 KiB
C

/* Return the offset of one string within another.
Copyright (C) 1994, 1996, 1997, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/*
* My personal strstr() implementation that beats most other algorithms.
* Until someone tells me otherwise, I assume that this is the
* fastest implementation of strstr() in C.
* I deliberately chose not to comment it. You should have at least
* as much fun trying to understand it, as I had to write it :-).
*
* Stephen R. van den Berg, berg@pool.informatik.rwth-aachen.de */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if defined _LIBC || defined HAVE_STRING_H
# include <string.h>
#endif
typedef unsigned chartype;
#undef strstr
char *
strstr (phaystack, pneedle)
const char *phaystack;
const char *pneedle;
{
register const unsigned char *haystack, *needle;
register chartype b, c;
haystack = (const unsigned char *) phaystack;
needle = (const unsigned char *) pneedle;
b = *needle;
if (b != '\0')
{
haystack--; /* possible ANSI violation */
do
{
c = *++haystack;
if (c == '\0')
goto ret0;
}
while (c != b);
c = *++needle;
if (c == '\0')
goto foundneedle;
++needle;
goto jin;
for (;;)
{
register chartype a;
register const unsigned char *rhaystack, *rneedle;
do
{
a = *++haystack;
if (a == '\0')
goto ret0;
if (a == b)
break;
a = *++haystack;
if (a == '\0')
goto ret0;
shloop:
;
}
while (a != b);
jin: a = *++haystack;
if (a == '\0')
goto ret0;
if (a != c)
goto shloop;
rhaystack = haystack-- + 1;
rneedle = needle;
a = *rneedle;
if (*rhaystack == a)
do
{
if (a == '\0')
goto foundneedle;
++rhaystack;
a = *++needle;
if (*rhaystack != a)
break;
if (a == '\0')
goto foundneedle;
++rhaystack;
a = *++needle;
}
while (*rhaystack == a);
needle = rneedle; /* took the register-poor approach */
if (a == '\0')
break;
}
}
foundneedle:
return (char*) haystack;
ret0:
return 0;
}