my_malloc.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /* Copyright (C) 2000 MySQL AB
- 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; either version 2 of the License, or
- (at your option) any later version.
- 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- #ifdef SAFEMALLOC /* We don't need SAFEMALLOC here */
- #undef SAFEMALLOC
- #endif
- #include "mysys_priv.h"
- #include "mysys_err.h"
- #include <m_string.h>
- /* My memory allocator */
- gptr my_malloc(unsigned int size, myf my_flags)
- {
- gptr point;
- DBUG_ENTER("my_malloc");
- DBUG_PRINT("my",("size: %u my_flags: %d",size, my_flags));
- if (!size)
- size=1; /* Safety */
- if ((point = (char*)malloc(size)) == NULL)
- {
- my_errno=errno;
- if (my_flags & MY_FAE)
- error_handler_hook=fatal_error_handler_hook;
- if (my_flags & (MY_FAE+MY_WME))
- my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_WAITTANG),size);
- if (my_flags & MY_FAE)
- exit(1);
- }
- else if (my_flags & MY_ZEROFILL)
- bzero(point,size);
- DBUG_PRINT("exit",("ptr: 0x%lx",point));
- DBUG_RETURN(point);
- } /* my_malloc */
- /* Free memory allocated with my_malloc */
- /*ARGSUSED*/
- void my_no_flags_free(gptr ptr)
- {
- DBUG_ENTER("my_free");
- DBUG_PRINT("my",("ptr: 0x%lx",ptr));
- if (ptr)
- free(ptr);
- DBUG_VOID_RETURN;
- } /* my_free */
- /* malloc and copy */
- gptr my_memdup(const byte *from, uint length, myf my_flags)
- {
- gptr ptr;
- if ((ptr=my_malloc(length,my_flags)) != 0)
- memcpy((byte*) ptr, (byte*) from,(size_t) length);
- return(ptr);
- }
- char *my_strdup(const char *from, myf my_flags)
- {
- gptr ptr;
- uint length=(uint) strlen(from)+1;
- if ((ptr=my_malloc(length,my_flags)) != 0)
- memcpy((byte*) ptr, (byte*) from,(size_t) length);
- return((my_string) ptr);
- }
- char *my_strdup_with_length(const byte *from, uint length, myf my_flags)
- {
- gptr ptr;
- if ((ptr=my_malloc(length+1,my_flags)) != 0)
- {
- memcpy((byte*) ptr, (byte*) from,(size_t) length);
- ((char*) ptr)[length]=0;
- }
- return((char*) ptr);
- }