1 files changed, 104 insertions, 0 deletions
diff --git a/REORG.TODO/string/strcasestr.c b/REORG.TODO/string/strcasestr.c
new file mode 100644
index 0000000000..2acf003155
--- /dev/null
+++ b/REORG.TODO/string/strcasestr.c
@@ -0,0 +1,104 @@
+/* Return the offset of one string within another.
+   Copyright (C) 1994-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ * 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	*/
+
+/* Specification.  */
+#include <string.h>
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <strings.h>
+
+#define TOLOWER(Ch) tolower (Ch)
+
+/* Two-Way algorithm.  */
+#define RETURN_TYPE char *
+#define AVAILABLE(h, h_l, j, n_l)			\
+  (!memchr ((h) + (h_l), '\0', (j) + (n_l) - (h_l))	\
+   && ((h_l) = (j) + (n_l)))
+#define CHECK_EOL (1)
+#define RET0_IF_0(a) if (!a) goto ret0
+#define CANON_ELEMENT(c) TOLOWER (c)
+#define CMP_FUNC(p1, p2, l)				\
+  __strncasecmp ((const char *) (p1), (const char *) (p2), l)
+#include "str-two-way.h"
+
+#undef strcasestr
+#undef __strcasestr
+
+#ifndef STRCASESTR
+#define STRCASESTR __strcasestr
+#endif
+
+
+/* Find the first occurrence of NEEDLE in HAYSTACK, using
+   case-insensitive comparison.  This function gives unspecified
+   results in multibyte locales.  */
+char *
+STRCASESTR (const char *haystack_start, const char *needle_start)
+{
+  const char *haystack = haystack_start;
+  const char *needle = needle_start;
+  size_t needle_len; /* Length of NEEDLE.  */
+  size_t haystack_len; /* Known minimum length of HAYSTACK.  */
+  bool ok = true; /* True if NEEDLE is prefix of HAYSTACK.  */
+
+  /* Determine length of NEEDLE, and in the process, make sure
+     HAYSTACK is at least as long (no point processing all of a long
+     NEEDLE if HAYSTACK is too short).  */
+  while (*haystack && *needle)
+    {
+      ok &= (TOLOWER ((unsigned char) *haystack)
+	     == TOLOWER ((unsigned char) *needle));
+      haystack++;
+      needle++;
+    }
+  if (*needle)
+    return NULL;
+  if (ok)
+    return (char *) haystack_start;
+  needle_len = needle - needle_start;
+  haystack = haystack_start + 1;
+  haystack_len = needle_len - 1;
+
+  /* Perform the search.  Abstract memory is considered to be an array
+     of 'unsigned char' values, not an array of 'char' values.  See
+     ISO C 99 section 6.2.6.1.  */
+  if (needle_len < LONG_NEEDLE_THRESHOLD)
+    return two_way_short_needle ((const unsigned char *) haystack,
+				 haystack_len,
+				 (const unsigned char *) needle_start,
+				 needle_len);
+  return two_way_long_needle ((const unsigned char *) haystack, haystack_len,
+			      (const unsigned char *) needle_start,
+			      needle_len);
+}
+
+#undef LONG_NEEDLE_THRESHOLD
+
+#ifndef NO_ALIAS
+weak_alias (__strcasestr, strcasestr)
+#endif