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mariadb/mysys/my_lib.c
Sergei Golubchik d8001106c9 MDEV-14469 build with cmake -DMYSQL_MAINTAINER_MODE=ON fails: 'readdir_r' is deprecated 
1. test readdir_r() availability under -Werror
2. don't protect readdir() with mutexes, it's not needed for the way
   we use readdir()
2018-01-15 15:57:04 +01:00

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/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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; version 2 of the License.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* TODO: check for overun of memory for names. */
#include "mysys_priv.h"
#include <m_string.h>
#include <my_dir.h> /* Structs used by my_dir,includes sys/types */
#include "mysys_err.h"
#if defined(HAVE_DIRENT_H)
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# if defined(HAVE_SYS_NDIR_H)
# include <sys/ndir.h>
# endif
# if defined(HAVE_SYS_DIR_H)
# include <sys/dir.h>
# endif
# if defined(HAVE_NDIR_H)
# include <ndir.h>
# endif
# if defined(_WIN32)
# ifdef __BORLANDC__
# include <dir.h>
# endif
# endif
#endif
#if defined(HAVE_READDIR_R)
#define READDIR(A,B,C) ((errno=readdir_r(A,B,&C)) != 0 || !C)
#else
#define READDIR(A,B,C) (!(C=readdir(A)))
#endif
/*
We are assuming that directory we are reading is either has less than
100 files and so can be read in one initial chunk or has more than 1000
files and so big increment are suitable.
*/
#define ENTRIES_START_SIZE (8192/sizeof(FILEINFO))
#define ENTRIES_INCREMENT (65536/sizeof(FILEINFO))
#define NAMES_START_SIZE 32768
static int comp_names(struct fileinfo *a,struct fileinfo *b);
/* We need this because program don't know with malloc we used */
void my_dirend(MY_DIR *buffer)
{
DBUG_ENTER("my_dirend");
if (buffer)
{
delete_dynamic((DYNAMIC_ARRAY*)((char*)buffer +
ALIGN_SIZE(sizeof(MY_DIR))));
free_root((MEM_ROOT*)((char*)buffer + ALIGN_SIZE(sizeof(MY_DIR)) +
ALIGN_SIZE(sizeof(DYNAMIC_ARRAY))), MYF(0));
my_free(buffer);
}
DBUG_VOID_RETURN;
} /* my_dirend */
/* Compare in sort of filenames */
static int comp_names(struct fileinfo *a, struct fileinfo *b)
{
return (strcmp(a->name,b->name));
} /* comp_names */
#if !defined(_WIN32)
MY_DIR *my_dir(const char *path, myf MyFlags)
{
char *buffer;
MY_DIR *result= 0;
FILEINFO finfo;
DYNAMIC_ARRAY *dir_entries_storage;
MEM_ROOT *names_storage;
DIR *dirp;
struct dirent *dp;
char tmp_path[FN_REFLEN + 2], *tmp_file;
char dirent_tmp[sizeof(struct dirent)+_POSIX_PATH_MAX+1];
DBUG_ENTER("my_dir");
DBUG_PRINT("my",("path: '%s' MyFlags: %d",path,MyFlags));
dirp = opendir(directory_file_name(tmp_path,(char *) path));
#if defined(__amiga__)
if ((dirp->dd_fd) < 0) /* Directory doesn't exists */
goto error;
#endif
if (dirp == NULL ||
! (buffer= my_malloc(ALIGN_SIZE(sizeof(MY_DIR)) +
ALIGN_SIZE(sizeof(DYNAMIC_ARRAY)) +
sizeof(MEM_ROOT), MyFlags)))
goto error;
dir_entries_storage= (DYNAMIC_ARRAY*)(buffer + ALIGN_SIZE(sizeof(MY_DIR)));
names_storage= (MEM_ROOT*)(buffer + ALIGN_SIZE(sizeof(MY_DIR)) +
ALIGN_SIZE(sizeof(DYNAMIC_ARRAY)));
if (my_init_dynamic_array(dir_entries_storage, sizeof(FILEINFO),
ENTRIES_START_SIZE, ENTRIES_INCREMENT))
{
my_free(buffer);
goto error;
}
init_alloc_root(names_storage, NAMES_START_SIZE, NAMES_START_SIZE);
/* MY_DIR structure is allocated and completly initialized at this point */
result= (MY_DIR*)buffer;
tmp_file=strend(tmp_path);
dp= (struct dirent*) dirent_tmp;
while (!(READDIR(dirp,(struct dirent*) dirent_tmp,dp)))
{
if (!(finfo.name= strdup_root(names_storage, dp->d_name)))
goto error;
if (MyFlags & MY_WANT_STAT)
{
if (!(finfo.mystat= (MY_STAT*)alloc_root(names_storage,
sizeof(MY_STAT))))
goto error;
bzero(finfo.mystat, sizeof(MY_STAT));
(void) strmov(tmp_file,dp->d_name);
(void) my_stat(tmp_path, finfo.mystat, MyFlags);
if (!(finfo.mystat->st_mode & MY_S_IREAD))
continue;
}
else
finfo.mystat= NULL;
if (push_dynamic(dir_entries_storage, (uchar*)&finfo))
goto error;
}
(void) closedir(dirp);
result->dir_entry= (FILEINFO *)dir_entries_storage->buffer;
result->number_off_files= dir_entries_storage->elements;
if (!(MyFlags & MY_DONT_SORT))
my_qsort((void *) result->dir_entry, result->number_off_files,
sizeof(FILEINFO), (qsort_cmp) comp_names);
DBUG_RETURN(result);
error:
my_errno=errno;
if (dirp)
(void) closedir(dirp);
my_dirend(result);
if (MyFlags & (MY_FAE | MY_WME))
my_error(EE_DIR,MYF(ME_BELL+ME_WAITTANG),path,my_errno);
DBUG_RETURN((MY_DIR *) NULL);
} /* my_dir */
/*
* Convert from directory name to filename.
* On UNIX, it's simple: just make sure there is a terminating /
* Returns pointer to dst;
*/
char * directory_file_name (char * dst, const char *src)
{
/* Process as Unix format: just remove test the final slash. */
char *end;
DBUG_ASSERT(strlen(src) < (FN_REFLEN + 1));
if (src[0] == 0)
src= (char*) "."; /* Use empty as current */
end= strnmov(dst, src, FN_REFLEN + 1);
if (end[-1] != FN_LIBCHAR)
{
end[0]=FN_LIBCHAR; /* Add last '/' */
end[1]='\0';
}
return dst;
}
#else
/*
*****************************************************************************
** Read long filename using windows rutines
*****************************************************************************
*/
MY_DIR *my_dir(const char *path, myf MyFlags)
{
char *buffer;
MY_DIR *result= 0;
FILEINFO finfo;
DYNAMIC_ARRAY *dir_entries_storage;
MEM_ROOT *names_storage;
#ifdef __BORLANDC__
struct ffblk find;
#else
struct _finddata_t find;
#endif
ushort mode;
char tmp_path[FN_REFLEN],*tmp_file,attrib;
#ifdef _WIN64
__int64 handle;
#else
long handle;
#endif
DBUG_ENTER("my_dir");
DBUG_PRINT("my",("path: '%s' stat: %d MyFlags: %d",path,MyFlags));
/* Put LIB-CHAR as last path-character if not there */
tmp_file=tmp_path;
if (!*path)
*tmp_file++ ='.'; /* From current dir */
tmp_file= strnmov(tmp_file, path, FN_REFLEN-5);
if (tmp_file[-1] == FN_DEVCHAR)
*tmp_file++= '.'; /* From current dev-dir */
if (tmp_file[-1] != FN_LIBCHAR)
*tmp_file++ =FN_LIBCHAR;
tmp_file[0]='*'; /* Windows needs this !??? */
tmp_file[1]='.';
tmp_file[2]='*';
tmp_file[3]='\0';
if (!(buffer= my_malloc(ALIGN_SIZE(sizeof(MY_DIR)) +
ALIGN_SIZE(sizeof(DYNAMIC_ARRAY)) +
sizeof(MEM_ROOT), MyFlags)))
goto error;
dir_entries_storage= (DYNAMIC_ARRAY*)(buffer + ALIGN_SIZE(sizeof(MY_DIR)));
names_storage= (MEM_ROOT*)(buffer + ALIGN_SIZE(sizeof(MY_DIR)) +
ALIGN_SIZE(sizeof(DYNAMIC_ARRAY)));
if (my_init_dynamic_array(dir_entries_storage, sizeof(FILEINFO),
ENTRIES_START_SIZE, ENTRIES_INCREMENT))
{
my_free(buffer);
goto error;
}
init_alloc_root(names_storage, NAMES_START_SIZE, NAMES_START_SIZE);
/* MY_DIR structure is allocated and completly initialized at this point */
result= (MY_DIR*)buffer;
#ifdef __BORLANDC__
if ((handle= findfirst(tmp_path,&find,0)) == -1L)
#else
if ((handle=_findfirst(tmp_path,&find)) == -1L)
#endif
{
DBUG_PRINT("info", ("findfirst returned error, errno: %d", errno));
if (errno != EINVAL)
goto error;
/*
Could not read the directory, no read access.
Probably because by "chmod -r".
continue and return zero files in dir
*/
}
else
{
do
{
#ifdef __BORLANDC__
attrib= find.ff_attrib;
#else
attrib= find.attrib;
/*
Do not show hidden and system files which Windows sometimes create.
Note. Because Borland's findfirst() is called with the third
argument = 0 hidden/system files are excluded from the search.
*/
if (attrib & (_A_HIDDEN | _A_SYSTEM))
continue;
#endif
#ifdef __BORLANDC__
if (!(finfo.name= strdup_root(names_storage, find.ff_name)))
goto error;
#else
if (!(finfo.name= strdup_root(names_storage, find.name)))
goto error;
#endif
if (MyFlags & MY_WANT_STAT)
{
if (!(finfo.mystat= (MY_STAT*)alloc_root(names_storage,
sizeof(MY_STAT))))
goto error;
bzero(finfo.mystat, sizeof(MY_STAT));
#ifdef __BORLANDC__
finfo.mystat->st_size=find.ff_fsize;
#else
finfo.mystat->st_size=find.size;
#endif
mode= MY_S_IREAD;
if (!(attrib & _A_RDONLY))
mode|= MY_S_IWRITE;
if (attrib & _A_SUBDIR)
mode|= MY_S_IFDIR;
finfo.mystat->st_mode= mode;
#ifdef __BORLANDC__
finfo.mystat->st_mtime= ((uint32) find.ff_ftime);
#else
finfo.mystat->st_mtime= ((uint32) find.time_write);
#endif
}
else
finfo.mystat= NULL;
if (push_dynamic(dir_entries_storage, (uchar*)&finfo))
goto error;
}
#ifdef __BORLANDC__
while (findnext(&find) == 0);
#else
while (_findnext(handle,&find) == 0);
_findclose(handle);
#endif
}
result->dir_entry= (FILEINFO *)dir_entries_storage->buffer;
result->number_off_files= dir_entries_storage->elements;
if (!(MyFlags & MY_DONT_SORT))
my_qsort((void *) result->dir_entry, result->number_off_files,
sizeof(FILEINFO), (qsort_cmp) comp_names);
DBUG_PRINT("exit", ("found %d files", result->number_off_files));
DBUG_RETURN(result);
error:
my_errno=errno;
#ifndef __BORLANDC__
if (handle != -1)
_findclose(handle);
#endif
my_dirend(result);
if (MyFlags & MY_FAE+MY_WME)
my_error(EE_DIR,MYF(ME_BELL+ME_WAITTANG),path,errno);
DBUG_RETURN((MY_DIR *) NULL);
} /* my_dir */
#endif /* _WIN32 */
/****************************************************************************
** File status
** Note that MY_STAT is assumed to be same as struct stat
****************************************************************************/
int my_fstat(File Filedes, MY_STAT *stat_area,
myf MyFlags __attribute__((unused)))
{
DBUG_ENTER("my_fstat");
DBUG_PRINT("my",("fd: %d MyFlags: %d", Filedes, MyFlags));
#ifdef _WIN32
DBUG_RETURN(my_win_fstat(Filedes, stat_area));
#else
DBUG_RETURN(fstat(Filedes, (struct stat *) stat_area));
#endif
}
MY_STAT *my_stat(const char *path, MY_STAT *stat_area, myf my_flags)
{
int m_used;
DBUG_ENTER("my_stat");
DBUG_PRINT("my", ("path: '%s' stat_area: 0x%lx MyFlags: %d", path,
(long) stat_area, my_flags));
if ((m_used= (stat_area == NULL)))
if (!(stat_area= (MY_STAT *) my_malloc(sizeof(MY_STAT), my_flags)))
goto error;
#ifndef _WIN32
if (! stat((char *) path, (struct stat *) stat_area) )
DBUG_RETURN(stat_area);
#else
if (! my_win_stat(path, stat_area) )
DBUG_RETURN(stat_area);
#endif
DBUG_PRINT("error",("Got errno: %d from stat", errno));
my_errno= errno;
if (m_used) /* Free if new area */
my_free(stat_area);
error:
if (my_flags & (MY_FAE+MY_WME))
{
my_error(EE_STAT, MYF(ME_BELL+ME_WAITTANG),path,my_errno);
DBUG_RETURN((MY_STAT *) NULL);
}
DBUG_RETURN((MY_STAT *) NULL);
} /* my_stat */
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