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author | Claudio Fontana <sick_soul@users.sourceforge.net> | 2005-11-01 09:18:33 +0000 |
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committer | Claudio Fontana <sick_soul@users.sourceforge.net> | 2005-11-01 09:18:33 +0000 |
commit | 0ed9e9bda21cf18774e2864d7312b76b94284578 (patch) | |
tree | f23a19cc7a3cdc2fcf75a3513cc14fe23a57638d /lib/strstr.c | |
parent | 1844565490b35f025e47445596a4577cc5afe13f (diff) | |
download | idutils-0ed9e9bda21cf18774e2864d7312b76b94284578.tar.gz idutils-0ed9e9bda21cf18774e2864d7312b76b94284578.tar.bz2 idutils-0ed9e9bda21cf18774e2864d7312b76b94284578.zip |
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Diffstat (limited to 'lib/strstr.c')
-rw-r--r-- | lib/strstr.c | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/lib/strstr.c b/lib/strstr.c deleted file mode 100644 index cdee621..0000000 --- a/lib/strstr.c +++ /dev/null @@ -1,116 +0,0 @@ -/* Copyright (C) 1994 Free Software Foundation, Inc. -This file is part of the GNU C Library. - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -This program 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 General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; 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 */ - -#include <string.h> -#include <sys/types.h> - -typedef unsigned chartype; - -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 aproach */ - - if (a == '\0') - break; - } - } -foundneedle: - return (char*) haystack; -ret0: - return 0; -} |