1 files changed, 165 insertions, 0 deletions
diff --git a/sql/lex_string.h b/sql/lex_string.h
new file mode 100644
index 00000000..56f37706
--- /dev/null
+++ b/sql/lex_string.h
@@ -0,0 +1,165 @@
+/*
+   Copyright (c) 2018, MariaDB Corporation.
+
+   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 St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+
+#ifndef LEX_STRING_INCLUDED
+#define LEX_STRING_INCLUDED
+
+
+typedef struct st_mysql_const_lex_string LEX_CSTRING;
+
+
+class Lex_cstring : public LEX_CSTRING
+{
+  public:
+  Lex_cstring()
+  {
+    str= NULL;
+    length= 0;
+  }
+  Lex_cstring(const LEX_CSTRING &str)
+  {
+    LEX_CSTRING::operator=(str);
+  }
+  Lex_cstring(const char *_str, size_t _len)
+  {
+    str= _str;
+    length= _len;
+  }
+  Lex_cstring(const char *start, const char *end)
+  {
+    DBUG_ASSERT(start <= end);
+    str= start;
+    length= end - start;
+  }
+  void set(const char *_str, size_t _len)
+  {
+    str= _str;
+    length= _len;
+  }
+
+  /*
+    Trim left white spaces.
+    Assumes that there are no multi-bytes characters
+    that can be considered white-space.
+  */
+  Lex_cstring ltrim_whitespace(CHARSET_INFO *cs) const
+  {
+    DBUG_ASSERT(cs->mbminlen == 1);
+    Lex_cstring str= *this;
+    while (str.length > 0 && my_isspace(cs, str.str[0]))
+    {
+      str.length--;
+      str.str++;
+    }
+    return str;
+  }
+
+  /*
+    Trim right white spaces.
+    Assumes that there are no multi-bytes characters
+    that can be considered white-space.
+    Also, assumes that the character set supports backward space parsing.
+  */
+  Lex_cstring rtrim_whitespace(CHARSET_INFO *cs) const
+  {
+    DBUG_ASSERT(cs->mbminlen == 1);
+    Lex_cstring str= *this;
+    while (str.length > 0 && my_isspace(cs, str.str[str.length - 1]))
+    {
+      str.length --;
+    }
+    return str;
+  }
+
+  /*
+    Trim all spaces.
+  */
+  Lex_cstring trim_whitespace(CHARSET_INFO *cs) const
+  {
+    return ltrim_whitespace(cs).rtrim_whitespace(cs);
+  }
+
+  /*
+    Trim all spaces and return the length of the leading space sequence.
+  */
+  Lex_cstring trim_whitespace(CHARSET_INFO *cs, size_t *prefix_length) const
+  {
+    Lex_cstring tmp= Lex_cstring(*this).ltrim_whitespace(cs);
+    if (prefix_length)
+      *prefix_length= tmp.str - str;
+    return tmp.rtrim_whitespace(cs);
+  }
+
+};
+
+
+class Lex_cstring_strlen: public Lex_cstring
+{
+public:
+  Lex_cstring_strlen(const char *from)
+   :Lex_cstring(from, from ? strlen(from) : 0)
+  { }
+};
+
+
+/* Functions to compare if two lex strings are equal */
+
+static inline bool lex_string_cmp(CHARSET_INFO *charset, const LEX_CSTRING *a,
+                                  const LEX_CSTRING *b)
+{
+  return my_strcasecmp(charset, a->str, b->str);
+}
+
+/*
+  Compare to LEX_CSTRING's and return 0 if equal
+*/
+
+static inline bool cmp(const LEX_CSTRING *a, const LEX_CSTRING *b)
+{
+  return a->length != b->length ||
+    (a->length && memcmp(a->str, b->str, a->length));
+}
+static inline bool cmp(const LEX_CSTRING a, const LEX_CSTRING b)
+{
+  return a.length != b.length || (a.length && memcmp(a.str, b.str, a.length));
+}
+
+/*
+  Compare if two LEX_CSTRING are equal. Assumption is that
+  character set is ASCII (like for plugin names)
+*/
+
+static inline bool lex_string_eq(const LEX_CSTRING *a, const LEX_CSTRING *b)
+{
+  if (a->length != b->length)
+    return 0;                                   /* Different */
+  return strcasecmp(a->str, b->str) == 0;
+}
+
+/*
+  To be used when calling lex_string_eq with STRING_WITH_LEN() as second
+  argument
+*/
+
+static inline bool lex_string_eq(const LEX_CSTRING *a, const char *b, size_t b_length)
+{
+  if (a->length != b_length)
+    return 0;                                   /* Different */
+  return strcasecmp(a->str, b) == 0;
+}
+
+#endif /* LEX_STRING_INCLUDED */