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authorJörg Frings-Fürst <debian@jff-webhosting.net>2014-10-06 14:00:40 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2014-10-06 14:00:40 +0200
commit6e9c41a892ed0e0da326e0278b3221ce3f5713b8 (patch)
tree2e301d871bbeeb44aa57ff9cc070fcf3be484487 /lib/strcasestr.c
Initial import of sane-backends version 1.0.24-1.2
Diffstat (limited to 'lib/strcasestr.c')
-rwxr-xr-xlib/strcasestr.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/lib/strcasestr.c b/lib/strcasestr.c
new file mode 100755
index 0000000..8999c50
--- /dev/null
+++ b/lib/strcasestr.c
@@ -0,0 +1,120 @@
+/* Return the offset of one string within another.
+ Copyright (C) 1994, 1996, 1997 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. 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 */
+/* added strcasestr support, davidm@lineo.com */
+
+#include "../include/sane/config.h"
+
+#ifndef HAVE_STRCASESTR
+
+#if defined HAVE_STRING_H
+# include <string.h>
+#endif
+
+typedef unsigned chartype;
+
+#include <ctype.h>
+#define VAL(x) tolower(x)
+
+char * strcasestr ( 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 (VAL(c) != VAL(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 (VAL(a) == VAL(b))
+ break;
+ a = *++haystack;
+ if (a == '\0')
+ goto ret0;
+ shloop:;}
+ while (VAL(a) != VAL(b));
+
+ jin:a = *++haystack;
+ if (a == '\0')
+ goto ret0;
+
+ if (VAL(a) != VAL(c))
+ goto shloop;
+
+ rhaystack = haystack-- + 1;
+ rneedle = needle;
+ a = *rneedle;
+
+ if (VAL(*rhaystack) == VAL(a))
+ do {
+ if (a == '\0')
+ goto foundneedle;
+ ++rhaystack;
+ a = *++needle;
+ if (VAL(*rhaystack) != VAL(a))
+ break;
+ if (a == '\0')
+ goto foundneedle;
+ ++rhaystack;
+ a = *++needle;
+ }
+ while (VAL(*rhaystack) == VAL(a));
+
+ needle = rneedle; /* took the register-poor approach */
+
+ if (a == '\0')
+ break;
+ }
+ }
+ foundneedle:
+ return (char *) haystack;
+ ret0:
+ return 0;
+}
+#endif