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by brian
clean slate |
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/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Not MT-SAFE */
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#include "mysys_priv.h" |
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#include "my_static.h" |
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#include "mysys_err.h" |
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#include <m_string.h> |
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/*
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Alloc for things we don't nead to free
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SYNOPSIS
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my_once_alloc()
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Size
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MyFlags
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NOTES
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No DBUG_ENTER... here to get smaller dbug-startup
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*/
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void* my_once_alloc(size_t Size, myf MyFlags) |
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{
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size_t get_size, max_left; |
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uchar* point; |
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register USED_MEM *next; |
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register USED_MEM **prev; |
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Size= ALIGN_SIZE(Size); |
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prev= &my_once_root_block; |
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max_left=0; |
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for (next=my_once_root_block ; next && next->left < Size ; next= next->next) |
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{
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if (next->left > max_left) |
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max_left=next->left; |
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prev= &next->next; |
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}
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if (! next) |
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{ /* Time to alloc new block */ |
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get_size= Size+ALIGN_SIZE(sizeof(USED_MEM)); |
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if (max_left*4 < my_once_extra && get_size < my_once_extra) |
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get_size=my_once_extra; /* Normal alloc */ |
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if ((next = (USED_MEM*) malloc(get_size)) == 0) |
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{
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my_errno=errno; |
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if (MyFlags & (MY_FAE+MY_WME)) |
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my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_WAITTANG),get_size); |
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return((uchar*) 0); |
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}
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DBUG_PRINT("test",("my_once_malloc %lu byte malloced", (ulong) get_size)); |
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next->next= 0; |
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next->size= get_size; |
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next->left= get_size-ALIGN_SIZE(sizeof(USED_MEM)); |
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*prev=next; |
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}
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point= (uchar*) ((char*) next+ (next->size-next->left)); |
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next->left-= Size; |
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if (MyFlags & MY_ZEROFILL) |
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bzero(point, Size); |
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return((void*) point); |
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} /* my_once_alloc */ |
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char *my_once_strdup(const char *src,myf myflags) |
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{
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size_t len= strlen(src)+1; |
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uchar *dst= my_once_alloc(len, myflags); |
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if (dst) |
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memcpy(dst, src, len); |
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return (char*) dst; |
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}
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void *my_once_memdup(const void *src, size_t len, myf myflags) |
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{
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uchar *dst= my_once_alloc(len, myflags); |
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if (dst) |
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memcpy(dst, src, len); |
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return dst; |
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}
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/*
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Deallocate everything used by my_once_alloc
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SYNOPSIS
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my_once_free()
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*/
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void my_once_free(void) |
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{
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register USED_MEM *next,*old; |
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DBUG_ENTER("my_once_free"); |
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for (next=my_once_root_block ; next ; ) |
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{
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old=next; next= next->next ; |
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free((uchar*) old); |
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}
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my_once_root_block=0; |
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DBUG_VOID_RETURN; |
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} /* my_once_free */ |