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some optimization in append_identifier (sql/sql_show.cc)

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sql/sql_show.cc:
  some optimization in append_identifier
This commit is contained in:
unknown 2004-02-13 00:28:00 +04:00
parent dfbaa16160
commit b3bf99ed42
1 changed files with 14 additions and 11 deletions
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25
sql/sql_show.cc
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@ -1086,7 +1086,7 @@ mysqld_dump_create_info(THD *thd, TABLE *table, int fd)
DBUG_RETURN(0);
}
static bool require_quotes(const char *name, uint length)
static inline const char *require_quotes(const char *name, uint length)
{
uint i, d, c;
for (i=0; i<length; i+=d)
@ -1094,7 +1094,7 @@ static bool require_quotes(const char *name, uint length)
c=((uchar *)name)[i];
d=my_mbcharlen(system_charset_info, c);
if (d==1 && !system_charset_info->ident_map[c])
return 1;
return name+i;
}
return 0;
}
@ -1113,7 +1113,8 @@ static bool require_quotes(const char *name, uint length)
0 string doesn't contain required char
*/
static const char *look_for_char(const char *name, uint length, char q)
static inline const char *look_for_char(const char *name,
uint length, char q)
{
const char *cur= name;
const char *end= cur+length;
@ -1141,27 +1142,29 @@ append_identifier(THD *thd, String *packet, const char *name, uint length)
if (is_keyword(name,length))
{
packet->append(&qtype, 1);
packet->append(&qtype, 1, system_charset_info);
packet->append(name, length, system_charset_info);
packet->append(&qtype, 1);
packet->append(&qtype, 1, system_charset_info);
}
else
{
if (!require_quotes(name, length))
if (!(qplace= require_quotes(name, length)))
{
if (!(thd->options & OPTION_QUOTE_SHOW_CREATE))
packet->append(name, length, system_charset_info);
else
{
packet->append(&qtype, 1);
packet->append(&qtype, 1, system_charset_info);
packet->append(name, length, system_charset_info);
packet->append(&qtype, 1);
packet->append(&qtype, 1, system_charset_info);
}
}
else
{
packet->append(&qtype, 1);
qplace= look_for_char(name,length,qtype);
packet->shrink(packet->length()+length+2);
packet->append(&qtype, 1, system_charset_info);
if (*qplace != qtype)
qplace= look_for_char(qplace+1,length-(qplace-name)-1,qtype);
while (qplace)
{
if ((part_len= qplace-name))
@ -1174,7 +1177,7 @@ append_identifier(THD *thd, String *packet, const char *name, uint length)
qplace= look_for_char(name+1,length-1,qtype);
}
packet->append(name, length, system_charset_info);
packet->append(&qtype, 1);
packet->append(&qtype, 1, system_charset_info);
}
}
}