mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
a49d0179db
* elf/dblloadmod2.c: Likewise. * elf/dblloadmod3.c: Likewise. * elf/reldepmod5.c: Likewise. * elf/reldepmod6.c: Likewise. * elf/dl-conflict.c (_dl_resolve_conflicts): Add unused attribute for resolve_conflict_map since RESOLVE_CONFLICT_FIND_MAP is not used on all architectures. * sunrpc/svc_tcp.c: Add noreturn attribute for svctcp_rendezvous_abort. * sunrpc/svc_unix.c: Likewise for svcunix_rendezvous_abort. * sysdeps/generic/strstr.c (strstr): Add paranthese for assignment to avoid warning.
123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
/* Return the offset of one string within another.
|
|
Copyright (C) 1994, 1996, 1997, 2000, 2001 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; 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;
|
|
{
|
|
const unsigned char *haystack, *needle;
|
|
chartype b;
|
|
const unsigned char *rneedle;
|
|
|
|
haystack = (const unsigned char *) phaystack;
|
|
|
|
if ((b = *(needle = (const unsigned char *) pneedle)))
|
|
{
|
|
chartype c;
|
|
haystack--; /* possible ANSI violation */
|
|
|
|
{
|
|
chartype a;
|
|
do
|
|
if (!(a = *++haystack))
|
|
goto ret0;
|
|
while (a != b);
|
|
}
|
|
|
|
if (!(c = *++needle))
|
|
goto foundneedle;
|
|
++needle;
|
|
goto jin;
|
|
|
|
for (;;)
|
|
{
|
|
{
|
|
chartype a;
|
|
if (0)
|
|
jin:{
|
|
if ((a = *++haystack) == c)
|
|
goto crest;
|
|
}
|
|
else
|
|
a = *++haystack;
|
|
do
|
|
{
|
|
for (; a != b; a = *++haystack)
|
|
{
|
|
if (!a)
|
|
goto ret0;
|
|
if ((a = *++haystack) == b)
|
|
break;
|
|
if (!a)
|
|
goto ret0;
|
|
}
|
|
}
|
|
while ((a = *++haystack) != c);
|
|
}
|
|
crest:
|
|
{
|
|
chartype a;
|
|
{
|
|
const unsigned char *rhaystack;
|
|
if (*(rhaystack = haystack-- + 1) == (a = *(rneedle = needle)))
|
|
do
|
|
{
|
|
if (!a)
|
|
goto foundneedle;
|
|
if (*++rhaystack != (a = *++needle))
|
|
break;
|
|
if (!a)
|
|
goto foundneedle;
|
|
}
|
|
while (*++rhaystack == (a = *++needle));
|
|
needle = rneedle; /* took the register-poor aproach */
|
|
}
|
|
if (!a)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
foundneedle:
|
|
return (char *) haystack;
|
|
ret0:
|
|
return 0;
|
|
}
|