diff options
Diffstat (limited to 'string/strstr.c')
-rw-r--r-- | string/strstr.c | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/string/strstr.c b/string/strstr.c deleted file mode 100644 index fce1f2a756..0000000000 --- a/string/strstr.c +++ /dev/null @@ -1,123 +0,0 @@ -/* Return the offset of one string within another. - Copyright (C) 1994,1996,1997,2000,2001,2003 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; -} -libc_hidden_builtin_def (strstr) |