IABSD.fr/xenocara/lib/libXfont/src/fontfile/bufio.c

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• Author : matthieu
  Date : 2007-09-08 16:13:41
  Hash : 82525649
  Message : import libXfont 1.3.0

• lib/libXfont/src/fontfile/bufio.c

• /* $Xorg: bufio.c,v 1.4 2001/02/09 02:04:03 xorgcvs Exp $ */
  
  /*
  
  Copyright 1991, 1998  The Open Group
  
  Permission to use, copy, modify, distribute, and sell this software and its
  documentation for any purpose is hereby granted without fee, provided that
  the above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation.
  
  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  OTHER DEALINGS IN THE SOFTWARE.
  
  Except as contained in this notice, the name of The Open Group shall
  not be used in advertising or otherwise to promote the sale, use or
  other dealings in this Software without prior written authorization
  from The Open Group.
  
  */
  /* $XFree86: xc/lib/font/fontfile/bufio.c,v 3.9 2001/12/14 19:56:50 dawes Exp $ */
  
  /*
   * Author:  Keith Packard, MIT X Consortium
   */
  
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include <X11/Xos.h>
  #include <X11/fonts/fontmisc.h>
  #include <X11/fonts/bufio.h>
  #include <errno.h>
  
  BufFilePtr
  BufFileCreate (char *private,
  	       int (*input)(BufFilePtr),
  	       int (*output)(int, BufFilePtr),
  	       int (*skip)(BufFilePtr, int),
  	       int (*close)(BufFilePtr, int))
  {
      BufFilePtr	f;
  
      f = (BufFilePtr) xalloc (sizeof *f);
      if (!f)
  	return 0;
      f->private = private;
      f->bufp = f->buffer;
      f->left = 0;
      f->input = input;
      f->output = output;
      f->skip = skip;
      f->eof  = 0;
      f->close = close;
      return f;
  }
  
  #define FileDes(f)  ((int)(long) (f)->private)
  
  static int
  BufFileRawFill (BufFilePtr f)
  {
      int	left;
  
      left = read (FileDes(f), (char *)f->buffer, BUFFILESIZE);
      if (left <= 0) {
  	f->left = 0;
  	return BUFFILEEOF;
      }
      f->left = left - 1;
      f->bufp = f->buffer + 1;
      return f->buffer[0];
  }
  
  static int
  BufFileRawSkip (BufFilePtr f, int count)
  {
      int	    curoff;
      int	    fileoff;
      int	    todo;
  
      curoff = f->bufp - f->buffer;
      fileoff = curoff + f->left;
      if (curoff + count <= fileoff) {
  	f->bufp += count;
  	f->left -= count;
      } else {
  	todo = count - (fileoff - curoff);
  	if (lseek (FileDes(f), todo, 1) == -1) {
  	    if (errno != ESPIPE)
  		return BUFFILEEOF;
  	    while (todo) {
  		curoff = BUFFILESIZE;
  		if (curoff > todo)
  		    curoff = todo;
  		fileoff = read (FileDes(f), (char *)f->buffer, curoff);
  		if (fileoff <= 0)
  		    return BUFFILEEOF;
  		todo -= fileoff;
  	    }
  	}
  	f->left = 0;
      }
      return count;
  }
  
  static int
  BufFileRawClose (BufFilePtr f, int doClose)
  {
      if (doClose)
  	close (FileDes (f));
      return 1;
  }
  
  BufFilePtr
  BufFileOpenRead (int fd)
  {
  #if defined(__UNIXOS2__) || defined (WIN32)
      /* hv: I'd bet WIN32 has the same effect here */
      setmode(fd,O_BINARY);
  #endif
      return BufFileCreate ((char *)(long) fd, BufFileRawFill, 0, BufFileRawSkip, BufFileRawClose);
  }
  
  static int
  BufFileRawFlush (int c, BufFilePtr f)
  {
      int	cnt;
  
      if (c != BUFFILEEOF)
  	*f->bufp++ = c;
      cnt = f->bufp - f->buffer;
      f->bufp = f->buffer;
      f->left = BUFFILESIZE;
      if (write (FileDes(f), (char *)f->buffer, cnt) != cnt)
  	return BUFFILEEOF;
      return c;
  }
  
  static int
  BufFileFlush (BufFilePtr f, int doClose)
  {
      if (f->bufp != f->buffer)
  	return (*f->output) (BUFFILEEOF, f);
      return 0;
  }
  
  BufFilePtr
  BufFileOpenWrite (int fd)
  {
      BufFilePtr	f;
  
  #if defined(__UNIXOS2__) || defined(WIN32)
      /* hv: I'd bet WIN32 has the same effect here */
      setmode(fd,O_BINARY);
  #endif
      f = BufFileCreate ((char *)(long) fd, 0, BufFileRawFlush, 0, BufFileFlush);
      f->bufp = f->buffer;
      f->left = BUFFILESIZE;
      return f;
  }
  
  int
  BufFileRead (BufFilePtr f, char *b, int n)
  {
      int	    c, cnt;
      cnt = n;
      while (cnt--) {
  	c = BufFileGet (f);
  	if (c == BUFFILEEOF)
  	    break;
  	*b++ = c;
      }
      return n - cnt - 1;
  }
  
  int
  BufFileWrite (BufFilePtr f, char *b, int n)
  {
      int	    cnt;
      cnt = n;
      while (cnt--) {
  	if (BufFilePut (*b++, f) == BUFFILEEOF)
  	    return BUFFILEEOF;
      }
      return n;
  }
  
  int
  BufFileClose (BufFilePtr f, int doClose)
  {
      int ret;
      ret = (*f->close) (f, doClose);
      xfree (f);
      return ret;
  }