From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 2 Nov 2017 23:11:29 +0300
Subject: Add implementation

---
 mysql/mysys/mf_wcomp.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 mysql/mysys/mf_wcomp.c

(limited to 'mysql/mysys/mf_wcomp.c')

diff --git a/mysql/mysys/mf_wcomp.c b/mysql/mysys/mf_wcomp.c
new file mode 100644
index 0000000..3d2510b
--- /dev/null
+++ b/mysql/mysys/mf_wcomp.c
@@ -0,0 +1,89 @@
+/* Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
+
+   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; version 2 of the License.
+
+   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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
+
+/* Funktions for comparing with wild-cards */
+
+#include "mysys_priv.h"
+
+	/* Test if a string is "comparable" to a wild-card string */
+	/* returns 0 if the strings are "comparable" */
+
+char wild_many='*';
+char wild_one='?';
+char wild_prefix=0; /* QQ this can potentially cause a SIGSEGV */
+
+int wild_compare(const char *str, const char *wildstr,
+                 pbool str_is_pattern)
+{
+  char cmp;
+  DBUG_ENTER("wild_compare");
+
+  while (*wildstr)
+  {
+    while (*wildstr && *wildstr != wild_many && *wildstr != wild_one)
+    {
+      if (*wildstr == wild_prefix && wildstr[1])
+      {
+	wildstr++;
+        if (str_is_pattern && *str++ != wild_prefix)
+          DBUG_RETURN(1);
+      }
+      if (*wildstr++ != *str++)
+        DBUG_RETURN(1);
+    }
+    if (! *wildstr )
+      DBUG_RETURN(*str != 0);
+    if (*wildstr++ == wild_one)
+    {
+      if (! *str || (str_is_pattern && *str == wild_many))
+        DBUG_RETURN(1);                     /* One char; skip */
+      if (*str++ == wild_prefix && str_is_pattern && *str)
+        str++;
+    }
+    else
+    {						/* Found '*' */
+      while (str_is_pattern && *str == wild_many)
+        str++;
+      for (; *wildstr ==  wild_many || *wildstr == wild_one; wildstr++)
+        if (*wildstr == wild_many)
+        {
+          while (str_is_pattern && *str == wild_many)
+            str++;
+        }
+        else
+        {
+          if (str_is_pattern && *str == wild_prefix && str[1])
+            str+=2;
+          else if (! *str++)
+            DBUG_RETURN (1);
+        }
+      if (!*wildstr)
+        DBUG_RETURN(0);		/* '*' as last char: OK */
+      if ((cmp= *wildstr) == wild_prefix && wildstr[1] && !str_is_pattern)
+        cmp=wildstr[1];
+      for (;;str++)
+      {
+        while (*str && *str != cmp)
+          str++;
+        if (!*str)
+          DBUG_RETURN (1);
+	if (wild_compare(str,wildstr,str_is_pattern) == 0)
+          DBUG_RETURN (0);
+      }
+      /* We will never come here */
+    }
+  }
+  DBUG_RETURN (*str != 0);
+} /* wild_compare */
-- 
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