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/* 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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "mysys/mysys_priv.h"
#include "my_static.h"
#include "mysys/mysys_err.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
static void make_ftype(char * to,int flag);
/*
Open a file as stream
SYNOPSIS
my_fopen()
FileName Path-name of file
Flags Read | write | append | trunc (like for open())
MyFlags Flags for handling errors
RETURN
0 Error
# File handler
*/
FILE *my_fopen(const char *filename, int flags, myf MyFlags)
{
FILE *fd;
char type[5];
/*
if we are not creating, then we need to use my_access to make sure
the file exists since Windows doesn't handle files like "com1.sym"
very well
*/
{
make_ftype(type,flags);
fd = fopen(filename, type);
}
if (fd != 0)
{
/*
The test works if MY_NFILE < 128. The problem is that fileno() is char
on some OS (SUNOS). Actually the filename save isn't that important
so we can ignore if this doesn't work.
*/
if ((uint32_t) fileno(fd) >= my_file_limit)
{
thread_safe_increment(my_stream_opened,&THR_LOCK_open);
return(fd); /* safeguard */
}
pthread_mutex_lock(&THR_LOCK_open);
if ((my_file_info[fileno(fd)].name = (char*)
strdup(filename)))
{
my_stream_opened++;
my_file_total_opened++;
my_file_info[fileno(fd)].type = STREAM_BY_FOPEN;
pthread_mutex_unlock(&THR_LOCK_open);
return(fd);
}
pthread_mutex_unlock(&THR_LOCK_open);
(void) my_fclose(fd,MyFlags);
my_errno=ENOMEM;
}
else
my_errno=errno;
if (MyFlags & (MY_FFNF | MY_FAE | MY_WME))
my_error((flags & O_RDONLY) || (flags == O_RDONLY ) ? EE_FILENOTFOUND :
EE_CANTCREATEFILE,
MYF(ME_BELL+ME_WAITTANG), filename, my_errno);
return((FILE*) 0);
} /* my_fopen */
/* Close a stream */
int my_fclose(FILE *fd, myf MyFlags)
{
int err,file;
pthread_mutex_lock(&THR_LOCK_open);
file=fileno(fd);
if ((err = fclose(fd)) < 0)
{
my_errno=errno;
if (MyFlags & (MY_FAE | MY_WME))
my_error(EE_BADCLOSE, MYF(ME_BELL+ME_WAITTANG),
my_filename(file),errno);
}
else
my_stream_opened--;
if ((uint32_t) file < my_file_limit && my_file_info[file].type != UNOPEN)
{
my_file_info[file].type = UNOPEN;
free(my_file_info[file].name);
}
pthread_mutex_unlock(&THR_LOCK_open);
return(err);
} /* my_fclose */
/*
Make a fopen() typestring from a open() type bitmap
SYNOPSIS
make_ftype()
to String for fopen() is stored here
flag Flag used by open()
IMPLEMENTATION
This routine attempts to find the best possible match
between a numeric option and a string option that could be
fed to fopen. There is not a 1 to 1 mapping between the two.
NOTE
On Unix, O_RDONLY is usually 0
MAPPING
r == O_RDONLY
w == O_WRONLY|O_TRUNC|O_CREAT
a == O_WRONLY|O_APPEND|O_CREAT
r+ == O_RDWR
w+ == O_RDWR|O_TRUNC|O_CREAT
a+ == O_RDWR|O_APPEND|O_CREAT
*/
static void make_ftype(register char * to, register int flag)
{
/* check some possible invalid combinations */
assert((flag & (O_TRUNC | O_APPEND)) != (O_TRUNC | O_APPEND));
assert((flag & (O_WRONLY | O_RDWR)) != (O_WRONLY | O_RDWR));
if ((flag & (O_RDONLY|O_WRONLY)) == O_WRONLY)
*to++= (flag & O_APPEND) ? 'a' : 'w';
else if (flag & O_RDWR)
{
/* Add '+' after theese */
if (flag & (O_TRUNC | O_CREAT))
*to++= 'w';
else if (flag & O_APPEND)
*to++= 'a';
else
*to++= 'r';
*to++= '+';
}
else
*to++= 'r';
*to='\0';
} /* make_ftype */
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