~drizzle-trunk/drizzle/development

/* 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_priv.h"

#include "my_static.h"

#include <errno.h>

#include "mysys_err.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 ((uint) 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*)

	 my_strdup(filename,MyFlags)))

    {

      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 ((uint) file < my_file_limit && my_file_info[file].type != UNOPEN)

  {

    my_file_info[file].type = UNOPEN;

    my_free(my_file_info[file].name, MYF(MY_ALLOW_ZERO_PTR));

  }

  pthread_mutex_unlock(&THR_LOCK_open);

  return(err);

} /* my_fclose */

	/* Make a stream out of a file handle */

	/* Name may be 0 */

FILE *my_fdopen(File Filedes, const char *name, int Flags, myf MyFlags)

{

  FILE *fd;

  char type[5];

  make_ftype(type,Flags);

  if ((fd = fdopen(Filedes, type)) == 0)

  {

    my_errno=errno;

    if (MyFlags & (MY_FAE | MY_WME))

      my_error(EE_CANT_OPEN_STREAM, MYF(ME_BELL+ME_WAITTANG),errno);

  }

  else

  {

    pthread_mutex_lock(&THR_LOCK_open);

    my_stream_opened++;

    if ((uint) Filedes < (uint) my_file_limit)

    {

      if (my_file_info[Filedes].type != UNOPEN)

      {

        my_file_opened--;		/* File is opened with my_open ! */

      }

      else

      {

        my_file_info[Filedes].name=  my_strdup(name,MyFlags);

      }

      my_file_info[Filedes].type = STREAM_BY_FDOPEN;

    }

    pthread_mutex_unlock(&THR_LOCK_open);

  }

  return(fd);

} /* my_fdopen */

/*   

  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';

#if FILE_BINARY            /* If we have binary-files */  

  if (flag & FILE_BINARY)    

    *to++='b';

#endif  

  *to='\0';

} /* make_ftype */