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e42c980967
The table opening process now works the following way: - Create common TABLE_SHARE object - Read the .frm file and unpack it into the TABLE_SHARE object - Create a TABLE object based on the information in the TABLE_SHARE object and open a handler to the table object Other noteworthy changes: - In TABLE_SHARE the most common strings are now LEX_STRING's - Better error message when table is not found - Variable table_cache is now renamed 'table_open_cache' - New variable 'table_definition_cache' that is the number of table defintions that will be cached - strxnmov() calls are now fixed to avoid overflows - strxnmov() will now always add one end \0 to result - engine objects are now created with a TABLE_SHARE object instead of a TABLE object. - After creating a field object one must call field->init(table) before using it - For a busy system this change will give you: - Less memory usage for table object - Faster opening of tables (if it's has been in use or is in table definition cache) - Allow you to cache many table definitions objects - Faster drop of table
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* Copyright (C) 2002 MySQL AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA */
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/* File : strxnmov.c
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Author : Richard A. O'Keefe.
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Updated: 2 June 1984
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Defines: strxnmov()
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strxnmov(dst, len, src1, ..., srcn, NullS)
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moves the first len characters of the concatenation of src1,...,srcn
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to dst and add a closing NUL character.
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It is just like strnmov except that it concatenates multiple sources.
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Beware: the last argument should be the null character pointer.
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Take VERY great care not to omit it! Also be careful to use NullS
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and NOT to use 0, as on some machines 0 is not the same size as a
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character pointer, or not the same bit pattern as NullS.
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NOTE
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strxnmov is like strnmov in that it moves up to len
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characters; dst will be padded on the right with one '\0' character.
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if total-string-length >= length then dst[length] will be set to \0
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*/
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#include <my_global.h>
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#include "m_string.h"
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#include <stdarg.h>
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char *strxnmov(char *dst,uint len, const char *src, ...)
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{
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va_list pvar;
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char *end_of_dst=dst+len;
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va_start(pvar,src);
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while (src != NullS)
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{
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do
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{
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if (dst == end_of_dst)
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goto end;
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}
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while ((*dst++ = *src++));
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dst--;
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src = va_arg(pvar, char *);
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}
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end:
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*dst=0;
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va_end(pvar);
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return dst;
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}
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