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/*
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
#include "sql_alloc.h"
#include "mysqld.h"
typedef struct st_mysql_const_lex_string LEX_CSTRING;
class Lex_cstring : public LEX_CSTRING, public Sql_alloc
{
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 *_str)
{
str= _str;
length= strlen(str);
}
Lex_cstring(const char *start, const char *end)
{
DBUG_ASSERT(start <= end);
str= start;
length= end - start;
}
bool strdup(MEM_ROOT *mem_root, const char *_str, size_t _len)
{
if (!_str)
{
str= NULL;
length= 0;
return false;
}
length= _len;
str= strmake_root(mem_root, _str, length);
return !str;
}
bool strdup(MEM_ROOT *mem_root, const char *_str)
{
if (!_str)
{
str= NULL;
length= 0;
return false;
}
return strdup(mem_root, _str, strlen(_str));
}
bool strdup(MEM_ROOT *mem_root, const Lex_cstring _str)
{
if (!_str.str)
{
str= NULL;
length= 0;
return false;
}
return strdup(mem_root, _str.str, _str.length);;
}
void set(const char *_str, size_t _len)
{
str= _str;
length= _len;
}
Lex_cstring print() const
{
return str ? *this : "(NULL)";
}
int cmp(const Lex_cstring& rhs) const
{
if (length < rhs.length)
return -1;
if (length > rhs.length)
return 1;
return memcmp(str, rhs.str, length);
}
int cmp(const char* rhs) const
{
if (!str)
return -1;
if (!rhs)
return 1;
return strcmp(str, rhs);
}
};
class Lex_cstring_strlen: public Lex_cstring
{
public:
Lex_cstring_strlen(const char *from)
:Lex_cstring(from, from ? strlen(from) : 0)
{ }
};
class Scope_malloc
{
void * addr;
public:
template <class PTR>
Scope_malloc(PTR alloced) : addr((void *)alloced)
{
DBUG_ASSERT(addr);
}
template <class PTR>
Scope_malloc(PTR &assign, size_t Size, myf MyFlags= 0)
{
addr= my_malloc(PSI_NOT_INSTRUMENTED, Size, MyFlags);
assign= (PTR) addr;
}
~Scope_malloc()
{
my_free(addr);
}
};
/* 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));
}
static inline int cmp_ident(const LEX_CSTRING a, const LEX_CSTRING b)
{
return my_strcasecmp(system_charset_info, a.str, b.str);
}
static inline int cmp_table(const LEX_CSTRING a, const LEX_CSTRING b)
{
return my_strcasecmp(table_alias_charset, a.str, b.str);
}
struct Lex_ident_lt
{
bool operator() (const Lex_cstring &lhs, const Lex_cstring &rhs) const
{
return cmp_ident(lhs, rhs) < 0;
}
};
/*
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;
}
inline
LEX_CSTRING *make_clex_string(MEM_ROOT *mem_root, const char* str, size_t length)
{
LEX_CSTRING *lex_str;
char *tmp;
if (unlikely(!(lex_str= (LEX_CSTRING *)alloc_root(mem_root,
sizeof(LEX_CSTRING) +
(str ? (length + 1) : 0)))))
return 0;
if (str)
{
tmp= (char*) (lex_str+1);
lex_str->str= tmp;
memcpy(tmp, str, length);
tmp[length]= 0;
lex_str->length= length;
}
else
{
DBUG_ASSERT(!length);
lex_str->str= NULL;
lex_str->length= 0;
}
return lex_str;
}
inline
LEX_CSTRING *make_clex_string(MEM_ROOT *mem_root, const LEX_CSTRING from)
{
return make_clex_string(mem_root, from.str, from.length);
}
#endif /* LEX_STRING_INCLUDED */
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