my_access.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* 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 */
- #include "mysys_priv.h"
- #include <m_string.h>
- #ifdef __WIN__
- /*
- Check a file or path for accessability.
-
- SYNOPSIS
- file_access()
- path Path to file
- amode Access method
-
- DESCRIPTION
- This function wraps the normal access method because the access
- available in MSVCRT> +reports that filenames such as LPT1 and
- COM1 are valid (they are but should not be so for us).
-
- RETURN VALUES
- 0 ok
- -1 error (We use -1 as my_access is mapped to access on other platforms)
- */
- int my_access(const char *path, int amode)
- {
- WIN32_FILE_ATTRIBUTE_DATA fileinfo;
- BOOL result;
-
- result= GetFileAttributesEx(path, GetFileExInfoStandard, &fileinfo);
- if (! result ||
- (fileinfo.dwFileAttributes & FILE_ATTRIBUTE_READONLY) && (amode & F_OK))
- {
- my_errno= errno= EACCES;
- return -1;
- }
- return 0;
- }
- #endif /* __WIN__ */
- #if defined(MSDOS) || defined(__WIN__) || defined(__EMX__)
- /*
- List of file names that causes problem on windows
- NOTE that one can also not have file names of type CON.TXT
- */
- static const char *reserved_names[]=
- {
- "CON", "PRN", "AUX", "NUL", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6",
- "COM7", "COM8", "COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6",
- "LPT7", "LPT8", "LPT9", "CLOCK$",
- NullS
- };
- #define MAX_RESERVED_NAME_LENGTH 6
- /*
- Check if a path will access a reserverd file name that may cause problems
-
- SYNOPSIS
- check_if_legal_filename
- path Path to file
- RETURN
- 0 ok
- 1 reserved file name
- */
- int check_if_legal_filename(const char *path)
- {
- const char *end;
- const char **reserved_name;
- DBUG_ENTER("check_if_legal_filename");
- path+= dirname_length(path); /* To start of filename */
- if (!(end= strchr(path, FN_EXTCHAR)))
- end= strend(path);
- if (path == end || (uint) (end - path) > MAX_RESERVED_NAME_LENGTH)
- DBUG_RETURN(0); /* Simplify inner loop */
- for (reserved_name= reserved_names; *reserved_name; reserved_name++)
- {
- const char *reserved= *reserved_name; /* never empty */
- const char *name= path;
-
- do
- {
- if (*reserved != my_toupper(&my_charset_latin1, *name))
- break;
- if (++name == end && !reserved[1])
- DBUG_RETURN(1); /* Found wrong path */
- } while (*++reserved);
- }
- DBUG_RETURN(0);
- }
- #endif
- #ifdef OS2
- int check_if_legal_filename(const char *path)
- {
- return 0;
- }
- #endif /* OS2 */