mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
68dc4dcbdd
2004-03-24 Ulrich Drepper <drepper@redhat.com> * stdio-common/vfscanf.c [!COMPILE_WSCANF] (TOLOWER): Cast first parameter to unsigned char. * sysdeps/generic/strcasestr.c [_LIBC] (TOLOWER): Likewise.
143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/* Return the offset of one string within another.
|
|
Copyright (C) 1994, 1996-2000, 2004 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
|
|
|
|
#include <ctype.h>
|
|
|
|
#if defined _LIBC || defined HAVE_STRING_H
|
|
# include <string.h>
|
|
#endif
|
|
|
|
#ifdef _LIBC
|
|
# include <locale/localeinfo.h>
|
|
# define TOLOWER(c) __tolower_l ((unsigned char) c, loc)
|
|
#else
|
|
# define TOLOWER(c) _tolower (c)
|
|
#endif
|
|
|
|
typedef unsigned chartype;
|
|
|
|
#undef strcasestr
|
|
#undef __strcasestr
|
|
|
|
char *
|
|
__strcasestr (phaystack, pneedle)
|
|
const char *phaystack;
|
|
const char *pneedle;
|
|
{
|
|
register const unsigned char *haystack, *needle;
|
|
register chartype b, c;
|
|
#ifdef _LIBC
|
|
__locale_t loc = _NL_CURRENT_LOCALE;
|
|
#endif
|
|
|
|
haystack = (const unsigned char *) phaystack;
|
|
needle = (const unsigned char *) pneedle;
|
|
|
|
b = TOLOWER (*needle);
|
|
if (b != '\0')
|
|
{
|
|
haystack--; /* possible ANSI violation */
|
|
do
|
|
{
|
|
c = *++haystack;
|
|
if (c == '\0')
|
|
goto ret0;
|
|
}
|
|
while (TOLOWER (c) != (int) b);
|
|
|
|
c = TOLOWER (*++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 (TOLOWER (a) == (int) b)
|
|
break;
|
|
a = *++haystack;
|
|
if (a == '\0')
|
|
goto ret0;
|
|
shloop:
|
|
;
|
|
}
|
|
while (TOLOWER (a) != (int) b);
|
|
|
|
jin: a = *++haystack;
|
|
if (a == '\0')
|
|
goto ret0;
|
|
|
|
if (TOLOWER (a) != (int) c)
|
|
goto shloop;
|
|
|
|
rhaystack = haystack-- + 1;
|
|
rneedle = needle;
|
|
a = TOLOWER (*rneedle);
|
|
|
|
if (TOLOWER (*rhaystack) == (int) a)
|
|
do
|
|
{
|
|
if (a == '\0')
|
|
goto foundneedle;
|
|
++rhaystack;
|
|
a = TOLOWER (*++needle);
|
|
if (TOLOWER (*rhaystack) != (int) a)
|
|
break;
|
|
if (a == '\0')
|
|
goto foundneedle;
|
|
++rhaystack;
|
|
a = TOLOWER (*++needle);
|
|
}
|
|
while (TOLOWER (*rhaystack) == (int) a);
|
|
|
|
needle = rneedle; /* took the register-poor approach */
|
|
|
|
if (a == '\0')
|
|
break;
|
|
}
|
|
}
|
|
foundneedle:
|
|
return (char*) haystack;
|
|
ret0:
|
|
return 0;
|
|
}
|
|
|
|
weak_alias (__strcasestr, strcasestr)
|