mxml/mxml-file.c

//
// File loading code for Mini-XML, a small XML file parsing library.
//
// https://www.msweet.org/mxml
//
// Copyright © 2003-2024 by Michael R Sweet.
//
// Licensed under Apache License v2.0.  See the file "LICENSE" for more
// information.
//

#ifndef _WIN32
#  include <unistd.h>
#endif // !_WIN32
#include "mxml-private.h"


//
// Character encoding...
//

#define ENCODE_UTF8	0		// UTF-8
#define ENCODE_UTF16BE	1		// UTF-16 Big-Endian
#define ENCODE_UTF16LE	2		// UTF-16 Little-Endian


//
// Macro to test for a bad XML character...
//

#define mxml_bad_char(ch) ((ch) < ' ' && (ch) != '\n' && (ch) != '\r' && (ch) != '\t')


//
// Types and structures...
//

typedef int (*_mxml_getc_cb_t)(void *, int *);
typedef int (*_mxml_putc_cb_t)(int, void *);

typedef struct _mxml_fdbuf_s		// File descriptor buffer
{
  int		fd;			// File descriptor
  unsigned char	*current,		// Current position in buffer
		*end,			// End of buffer
		buffer[8192];		// Character buffer
} _mxml_fdbuf_t;


//
// Local functions...
//

static int		mxml_add_char(int ch, char **ptr, char **buffer, int *bufsize);
static int		mxml_fd_getc(void *p, int *encoding);
static int		mxml_fd_putc(int ch, void *p);
static int		mxml_fd_read(_mxml_fdbuf_t *buf);
static int		mxml_fd_write(_mxml_fdbuf_t *buf);
static int		mxml_file_getc(void *p, int *encoding);
static int		mxml_file_putc(int ch, void *p);
static int		mxml_get_entity(mxml_node_t *parent, void *p, int *encoding, _mxml_getc_cb_t getc_cb, int *line);
static inline int	mxml_isspace(int ch)
			{
			  return (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n');
			}
static mxml_node_t	*mxml_load_data(mxml_node_t *top, void *p, mxml_load_cb_t cb, _mxml_getc_cb_t getc_cb, mxml_sax_cb_t sax_cb, void *sax_data);
static int		mxml_parse_element(mxml_node_t *node, void *p, int *encoding, _mxml_getc_cb_t getc_cb, int *line);
static int		mxml_string_getc(void *p, int *encoding);
static int		mxml_string_putc(int ch, void *p);
static int		mxml_write_name(const char *s, void *p, _mxml_putc_cb_t putc_cb);
static int		mxml_write_node(mxml_node_t *node, void *p, mxml_save_cb_t cb, int col, _mxml_putc_cb_t putc_cb, _mxml_global_t *global);
static int		mxml_write_string(const char *s, void *p, _mxml_putc_cb_t putc_cb);
static int		mxml_write_ws(mxml_node_t *node, void *p, mxml_save_cb_t cb, int ws, int col, _mxml_putc_cb_t putc_cb);


//
// 'mxmlLoadFd()' - Load a file descriptor into an XML node tree.
//
// The nodes in the specified file are added to the specified top node.
// If no top node is provided, the XML file MUST be well-formed with a
// single parent node like <?xml> for the entire file. The callback
// function returns the value type that should be used for child nodes.
// The constants `MXML_INTEGER_CALLBACK`, `MXML_TYPE_OPAQUE_CALLBACK`,
// `MXML_REAL_CALLBACK`, and `MXML_TYPE_TEXT_CALLBACK` are defined for
// loading child (data) nodes of the specified type.
//
// Note: The most common programming error when using the Mini-XML library is
// to load an XML file using the `MXML_TEXT_CALLBACK`, which returns inline
// text as a series of whitespace-delimited words, instead of using the
// `MXML_OPAQUE_CALLBACK` which returns the inline text as a single string
// (including whitespace).
//

mxml_node_t *				// O - First node or `NULL` if the file could not be read.
mxmlLoadFd(mxml_node_t    *top,		// I - Top node
           int            fd,		// I - File descriptor to read from
           mxml_load_cb_t cb)		// I - Callback function or constant
{
  _mxml_fdbuf_t	buf;			// File descriptor buffer


  // Initialize the file descriptor buffer...
  buf.fd      = fd;
  buf.current = buf.buffer;
  buf.end     = buf.buffer;

  // Read the XML data...
  return (mxml_load_data(top, &buf, cb, mxml_fd_getc, MXML_NO_CALLBACK, NULL));
}


//
// 'mxmlLoadFile()' - Load a file into an XML node tree.
//
// The nodes in the specified file are added to the specified top node.
// If no top node is provided, the XML file MUST be well-formed with a
// single parent node like <?xml> for the entire file. The callback
// function returns the value type that should be used for child nodes.
// The constants `MXML_INTEGER_CALLBACK`, `MXML_TYPE_OPAQUE_CALLBACK`,
// `MXML_REAL_CALLBACK`, and `MXML_TYPE_TEXT_CALLBACK` are defined for
// loading child (data) nodes of the specified type.
//
// Note: The most common programming error when using the Mini-XML library is
// to load an XML file using the `MXML_TEXT_CALLBACK`, which returns inline
// text as a series of whitespace-delimited words, instead of using the
// `MXML_OPAQUE_CALLBACK` which returns the inline text as a single string
// (including whitespace).
//

mxml_node_t *				// O - First node or `NULL` if the file could not be read.
mxmlLoadFile(mxml_node_t    *top,	// I - Top node
             FILE           *fp,	// I - File to read from
             mxml_load_cb_t cb)		// I - Callback function or constant
{
  // Read the XML data...
  return (mxml_load_data(top, fp, cb, mxml_file_getc, MXML_NO_CALLBACK, NULL));
}


//
// 'mxmlLoadString()' - Load a string into an XML node tree.
//
// The nodes in the specified string are added to the specified top node.
// If no top node is provided, the XML string MUST be well-formed with a
// single parent node like <?xml> for the entire string. The callback
// function returns the value type that should be used for child nodes.
// The constants `MXML_INTEGER_CALLBACK`, `MXML_TYPE_OPAQUE_CALLBACK`,
// `MXML_REAL_CALLBACK`, and `MXML_TYPE_TEXT_CALLBACK` are defined for
// loading child (data) nodes of the specified type.
//
// Note: The most common programming error when using the Mini-XML library is
// to load an XML file using the `MXML_TEXT_CALLBACK`, which returns inline
// text as a series of whitespace-delimited words, instead of using the
// `MXML_OPAQUE_CALLBACK` which returns the inline text as a single string
// (including whitespace).
//

mxml_node_t *				// O - First node or `NULL` if the string has errors.
mxmlLoadString(mxml_node_t    *top,	// I - Top node
               const char     *s,	// I - String to load
               mxml_load_cb_t cb)	// I - Callback function or constant
{
  // Read the XML data...
  return (mxml_load_data(top, (void *)&s, cb, mxml_string_getc, MXML_NO_CALLBACK, NULL));
}


//
// 'mxmlSaveAllocString()' - Save an XML tree to an allocated string.
//
// This function returns a pointer to a string containing the textual
// representation of the XML node tree.  The string should be freed
// using `free()` when you are done with it.  `NULL` is returned if the node
// would produce an empty string or if the string cannot be allocated.
//
// The callback argument specifies a function that returns a whitespace
// string or `NULL` before and after each element.  If `MXML_NO_CALLBACK`
// is specified, whitespace will only be added before `MXML_TYPE_TEXT` nodes
// with leading whitespace and before attribute names inside opening
// element tags.
//

char *					// O - Allocated string or `NULL`
mxmlSaveAllocString(
    mxml_node_t    *node,		// I - Node to write
    mxml_save_cb_t cb)			// I - Whitespace callback or `MXML_NO_CALLBACK`
{
  int	bytes;				// Required bytes
  char	buffer[8192];			// Temporary buffer
  char	*s;				// Allocated string


  // Write the node to the temporary buffer...
  bytes = mxmlSaveString(node, buffer, sizeof(buffer), cb);

  if (bytes <= 0)
    return (NULL);

  if (bytes < (int)(sizeof(buffer) - 1))
  {
    // Node fit inside the buffer, so just duplicate that string and return...
    return (strdup(buffer));
  }

  // Allocate a buffer of the required size and save the node to the new buffer...
  if ((s = malloc(bytes + 1)) == NULL)
    return (NULL);

  mxmlSaveString(node, s, bytes + 1, cb);

  // Return the allocated string...
  return (s);
}


//
// 'mxmlSaveFd()' - Save an XML tree to a file descriptor.
//
// The callback argument specifies a function that returns a whitespace
// string or NULL before and after each element. If `MXML_NO_CALLBACK`
// is specified, whitespace will only be added before `MXML_TYPE_TEXT` nodes
// with leading whitespace and before attribute names inside opening
// element tags.
//

bool					// O - `true` on success, `false` on error.
mxmlSaveFd(mxml_node_t    *node,	// I - Node to write
           int            fd,		// I - File descriptor to write to
	   mxml_save_cb_t cb)		// I - Whitespace callback or `MXML_NO_CALLBACK`
{
  int		col;			// Final column
  _mxml_fdbuf_t	buf;			// File descriptor buffer
  _mxml_global_t *global = _mxml_global();
					// Global data


  // Initialize the file descriptor buffer...
  buf.fd      = fd;
  buf.current = buf.buffer;
  buf.end     = buf.buffer + sizeof(buf.buffer);

  // Write the node...
  if ((col = mxml_write_node(node, &buf, cb, 0, mxml_fd_putc, global)) < 0)
    return (-1);

  if (col > 0)
  {
    if (mxml_fd_putc('\n', &buf) < 0)
      return (-1);
  }

  // Flush and return...
  return (mxml_fd_write(&buf));
}


//
// 'mxmlSaveFile()' - Save an XML tree to a file.
//
// The callback argument specifies a function that returns a whitespace
// string or NULL before and after each element. If `MXML_NO_CALLBACK`
// is specified, whitespace will only be added before `MXML_TYPE_TEXT` nodes
// with leading whitespace and before attribute names inside opening
// element tags.
//

bool					// O - `true` on success, `false` on error.
mxmlSaveFile(mxml_node_t    *node,	// I - Node to write
             FILE           *fp,	// I - File to write to
	     mxml_save_cb_t cb)		// I - Whitespace callback or `MXML_NO_CALLBACK`
{
  int	col;				// Final column
  _mxml_global_t *global = _mxml_global();
					// Global data


  // Write the node...
  if ((col = mxml_write_node(node, fp, cb, 0, mxml_file_putc, global)) < 0)
    return (-1);

  if (col > 0)
  {
    if (putc('\n', fp) < 0)
      return (-1);
  }

  // Return 0 (success)...
  return (0);
}


//
// 'mxmlSaveString()' - Save an XML node tree to a string.
//
// This function returns the total number of bytes that would be
// required for the string but only copies (bufsize - 1) characters
// into the specified buffer.
//
// The callback argument specifies a function that returns a whitespace
// string or NULL before and after each element. If `MXML_NO_CALLBACK`
// is specified, whitespace will only be added before `MXML_TYPE_TEXT` nodes
// with leading whitespace and before attribute names inside opening
// element tags.
//

size_t					// O - Size of string
mxmlSaveString(mxml_node_t    *node,	// I - Node to write
               char           *buffer,	// I - String buffer
               size_t         bufsize,	// I - Size of string buffer
               mxml_save_cb_t cb)	// I - Whitespace callback or `MXML_NO_CALLBACK`
{
  int	col;				// Final column
  char	*ptr[2];			// Pointers for putc_cb
  _mxml_global_t *global = _mxml_global();
					// Global data


  // Write the node...
  ptr[0] = buffer;
  ptr[1] = buffer + bufsize;

  if ((col = mxml_write_node(node, ptr, cb, 0, mxml_string_putc, global)) < 0)
    return (-1);

  if (col > 0)
    mxml_string_putc('\n', ptr);

  // Nul-terminate the buffer...
  if (ptr[0] >= ptr[1])
  {
    if (bufsize > 0)
      buffer[bufsize - 1] = '\0';
  }
  else
  {
    ptr[0][0] = '\0';
  }

  // Return the number of characters...
  return ((size_t)(ptr[0] - buffer));
}


//
// 'mxmlSAXLoadFd()' - Load a file descriptor into an XML node tree
//                     using a SAX callback.
//
// The nodes in the specified file are added to the specified top node.
// If no top node is provided, the XML file MUST be well-formed with a
// single parent node like <?xml> for the entire file. The callback
// function returns the value type that should be used for child nodes.
// The constants `MXML_INTEGER_CALLBACK`, `MXML_TYPE_OPAQUE_CALLBACK`,
// `MXML_REAL_CALLBACK`, and `MXML_TYPE_TEXT_CALLBACK` are defined for
// loading child nodes of the specified type.
//
// The SAX callback must call @link mxmlRetain@ for any nodes that need to
// be kept for later use. Otherwise, nodes are deleted when the parent
// node is closed or after each data, comment, CDATA, or directive node.
//

mxml_node_t *				// O - First node or `NULL` if the file could not be read.
mxmlSAXLoadFd(mxml_node_t    *top,	// I - Top node
              int            fd,	// I - File descriptor to read from
              mxml_load_cb_t cb,	// I - Callback function or constant
              mxml_sax_cb_t  sax_cb,	// I - SAX callback or `MXML_NO_CALLBACK`
              void           *sax_data)	// I - SAX user data
{
  _mxml_fdbuf_t	buf;			// File descriptor buffer


  // Initialize the file descriptor buffer...
  buf.fd      = fd;
  buf.current = buf.buffer;
  buf.end     = buf.buffer;

  // Read the XML data...
  return (mxml_load_data(top, &buf, cb, mxml_fd_getc, sax_cb, sax_data));
}


//
// 'mxmlSAXLoadFile()' - Load a file into an XML node tree
//                       using a SAX callback.
//
// The nodes in the specified file are added to the specified top node.
// If no top node is provided, the XML file MUST be well-formed with a
// single parent node like <?xml> for the entire file. The callback
// function returns the value type that should be used for child nodes.
// The constants `MXML_INTEGER_CALLBACK`, `MXML_TYPE_OPAQUE_CALLBACK`,
// `MXML_REAL_CALLBACK`, and `MXML_TYPE_TEXT_CALLBACK` are defined for
// loading child nodes of the specified type.
//
// The SAX callback must call @link mxmlRetain@ for any nodes that need to
// be kept for later use. Otherwise, nodes are deleted when the parent
// node is closed or after each data, comment, CDATA, or directive node.
//

mxml_node_t *				// O - First node or `NULL` if the file could not be read.
mxmlSAXLoadFile(
    mxml_node_t    *top,		// I - Top node
    FILE           *fp,			// I - File to read from
    mxml_load_cb_t cb,			// I - Callback function or constant
    mxml_sax_cb_t  sax_cb,		// I - SAX callback or `MXML_NO_CALLBACK`
    void           *sax_data)		// I - SAX user data
{
  // Read the XML data...
  return (mxml_load_data(top, fp, cb, mxml_file_getc, sax_cb, sax_data));
}


//
// 'mxmlSAXLoadString()' - Load a string into an XML node tree
//                         using a SAX callback.
//
// The nodes in the specified string are added to the specified top node.
// If no top node is provided, the XML string MUST be well-formed with a
// single parent node like <?xml> for the entire string. The callback
// function returns the value type that should be used for child nodes.
// The constants `MXML_INTEGER_CALLBACK`, `MXML_TYPE_OPAQUE_CALLBACK`,
// `MXML_REAL_CALLBACK`, and `MXML_TYPE_TEXT_CALLBACK` are defined for
// loading child nodes of the specified type.
//
// The SAX callback must call @link mxmlRetain@ for any nodes that need to
// be kept for later use. Otherwise, nodes are deleted when the parent
// node is closed or after each data, comment, CDATA, or directive node.
//

mxml_node_t *				// O - First node or `NULL` if the string has errors.
mxmlSAXLoadString(
    mxml_node_t    *top,		// I - Top node
    const char     *s,			// I - String to load
    mxml_load_cb_t cb,			// I - Callback function or constant
    mxml_sax_cb_t  sax_cb,		// I - SAX callback or `MXML_NO_CALLBACK`
    void           *sax_data)		// I - SAX user data
{
  // Read the XML data...
  return (mxml_load_data(top, (void *)&s, cb, mxml_string_getc, sax_cb, sax_data));
}


//
// 'mxmlSetCustomHandlers()' - Set the handling functions for custom data.
//
// The load function accepts a node pointer and a data string and must
// return 0 on success and non-zero on error.
//
// The save function accepts a node pointer and must return a malloc'd
// string on success and `NULL` on error.
//
//

void
mxmlSetCustomHandlers(
    mxml_custom_load_cb_t load,		// I - Load function
    mxml_custom_save_cb_t save)		// I - Save function
{
  _mxml_global_t *global = _mxml_global();
					// Global data


  global->custom_load_cb = load;
  global->custom_save_cb = save;
}


//
// 'mxmlSetErrorCallback()' - Set the error message callback.
//

void
mxmlSetErrorCallback(mxml_error_cb_t cb)// I - Error callback function
{
  _mxml_global_t *global = _mxml_global();
					// Global data


  global->error_cb = cb;
}


//
// 'mxmlSetWrapMargin()' - Set the wrap margin when saving XML data.
//
// Wrapping is disabled when "column" is 0.
//

void
mxmlSetWrapMargin(int column)		// I - Column for wrapping, 0 to disable wrapping
{
  _mxml_global_t *global = _mxml_global();
					// Global data


  global->wrap = column;
}


//
// 'mxml_add_char()' - Add a character to a buffer, expanding as needed.
//

static int				// O  - 0 on success, -1 on error
mxml_add_char(int  ch,			// I  - Character to add
              char **bufptr,		// IO - Current position in buffer
	      char **buffer,		// IO - Current buffer
	      int  *bufsize)		// IO - Current buffer size
{
  char	*newbuffer;			// New buffer value


  if (*bufptr >= (*buffer + *bufsize - 4))
  {
    // Increase the size of the buffer...
    if (*bufsize < 1024)
      (*bufsize) *= 2;
    else
      (*bufsize) += 1024;

    if ((newbuffer = realloc(*buffer, *bufsize)) == NULL)
    {
      mxml_error("Unable to expand string buffer to %d bytes.", *bufsize);

      return (-1);
    }

    *bufptr = newbuffer + (*bufptr - *buffer);
    *buffer = newbuffer;
  }

  if (ch < 0x80)
  {
    // Single byte ASCII...
    *(*bufptr)++ = ch;
  }
  else if (ch < 0x800)
  {
    // Two-byte UTF-8...
    *(*bufptr)++ = 0xc0 | (ch >> 6);
    *(*bufptr)++ = 0x80 | (ch & 0x3f);
  }
  else if (ch < 0x10000)
  {
    // Three-byte UTF-8...
    *(*bufptr)++ = 0xe0 | (ch >> 12);
    *(*bufptr)++ = 0x80 | ((ch >> 6) & 0x3f);
    *(*bufptr)++ = 0x80 | (ch & 0x3f);
  }
  else
  {
    // Four-byte UTF-8...
    *(*bufptr)++ = 0xf0 | (ch >> 18);
    *(*bufptr)++ = 0x80 | ((ch >> 12) & 0x3f);
    *(*bufptr)++ = 0x80 | ((ch >> 6) & 0x3f);
    *(*bufptr)++ = 0x80 | (ch & 0x3f);
  }

  return (0);
}


//
// 'mxml_fd_getc()' - Read a character from a file descriptor.
//

static int				// O  - Character or EOF
mxml_fd_getc(void *p,			// I  - File descriptor buffer
             int  *encoding)		// IO - Encoding
{
  _mxml_fdbuf_t	*buf;			// File descriptor buffer
  int		ch,			// Current character
		temp;			// Temporary character


  // Grab the next character in the buffer...
  buf = (_mxml_fdbuf_t *)p;

  if (buf->current >= buf->end)
  {
    if (mxml_fd_read(buf) < 0)
      return (EOF);
  }

  ch = *(buf->current)++;

  switch (*encoding)
  {
    case ENCODE_UTF8 :
        // Got a UTF-8 character; convert UTF-8 to Unicode and return...
	if (!(ch & 0x80))
	{
          MXML_DEBUG("mxml_fd_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);

	  if (mxml_bad_char(ch))
	  {
	    mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	    return (EOF);
	  }

	  return (ch);
        }
	else if (ch == 0xfe)
	{
	  // UTF-16 big-endian BOM?
	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
          }

	  ch = *(buf->current)++;

	  if (ch != 0xff)
	    return (EOF);

	  *encoding = ENCODE_UTF16BE;

	  return (mxml_fd_getc(p, encoding));
	}
	else if (ch == 0xff)
	{
	  // UTF-16 little-endian BOM?
	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  ch = *(buf->current)++;

	  if (ch != 0xfe)
	    return (EOF);

	  *encoding = ENCODE_UTF16LE;

	  return (mxml_fd_getc(p, encoding));
	}
	else if ((ch & 0xe0) == 0xc0)
	{
	  // Two-byte value...
	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
          }

	  temp = *(buf->current)++;

	  if ((temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = ((ch & 0x1f) << 6) | (temp & 0x3f);

	  if (ch < 0x80)
	  {
	    mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	    return (EOF);
	  }
	}
	else if ((ch & 0xf0) == 0xe0)
	{
	  // Three-byte value...
	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
          }

	  temp = *(buf->current)++;

	  if ((temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = ((ch & 0x0f) << 6) | (temp & 0x3f);

	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  temp = *(buf->current)++;

	  if ((temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = (ch << 6) | (temp & 0x3f);

	  if (ch < 0x800)
	  {
	    mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	    return (EOF);
	  }

          // Ignore (strip) Byte Order Mark (BOM)...
	  if (ch == 0xfeff)
	    return (mxml_fd_getc(p, encoding));
	}
	else if ((ch & 0xf8) == 0xf0)
	{
	  // Four-byte value...
	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  temp = *(buf->current)++;

	  if ((temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = ((ch & 0x07) << 6) | (temp & 0x3f);

	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  temp = *(buf->current)++;

	  if ((temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = (ch << 6) | (temp & 0x3f);

	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  temp = *(buf->current)++;

	  if ((temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = (ch << 6) | (temp & 0x3f);

	  if (ch < 0x10000)
	  {
	    mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	    return (EOF);
	  }
	}
	else
	{
	  return (EOF);
	}
	break;

    case ENCODE_UTF16BE :
        // Read UTF-16 big-endian char...
	if (buf->current >= buf->end)
	{
	  if (mxml_fd_read(buf) < 0)
	    return (EOF);
	}

	temp = *(buf->current)++;

	ch = (ch << 8) | temp;

	if (mxml_bad_char(ch))
	{
	  mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	  return (EOF);
	}
        else if (ch >= 0xd800 && ch <= 0xdbff)
	{
	  // Multi-word UTF-16 char...
          int lch;

	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  lch = *(buf->current)++;

	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  temp = *(buf->current)++;

	  lch = (lch << 8) | temp;

          if (lch < 0xdc00 || lch >= 0xdfff)
	    return (EOF);

          ch = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
	}
	break;

    case ENCODE_UTF16LE :
        // Read UTF-16 little-endian char...
	if (buf->current >= buf->end)
	{
	  if (mxml_fd_read(buf) < 0)
	    return (EOF);
	}

	temp = *(buf->current)++;

	ch |= (temp << 8);

        if (mxml_bad_char(ch))
	{
	  mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	  return (EOF);
	}
        else if (ch >= 0xd800 && ch <= 0xdbff)
	{
	  // Multi-word UTF-16 char...
          int lch;

	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  lch = *(buf->current)++;

	  if (buf->current >= buf->end)
	  {
	    if (mxml_fd_read(buf) < 0)
	      return (EOF);
	  }

	  temp = *(buf->current)++;

	  lch |= (temp << 8);

          if (lch < 0xdc00 || lch >= 0xdfff)
	    return (EOF);

          ch = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
	}
	break;
  }

  MXML_DEBUG("mxml_fd_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);

  return (ch);
}


//
// 'mxml_fd_putc()' - Write a character to a file descriptor.
//

static int				// O - 0 on success, -1 on error
mxml_fd_putc(int  ch,			// I - Character
             void *p)			// I - File descriptor buffer
{
  _mxml_fdbuf_t	*buf;			// File descriptor buffer


  // Flush the write buffer as needed...
  buf = (_mxml_fdbuf_t *)p;

  if (buf->current >= buf->end)
  {
    if (mxml_fd_write(buf) < 0)
      return (-1);
  }

  *(buf->current)++ = ch;

  // Return successfully...
  return (0);
}


//
// 'mxml_fd_read()' - Read a buffer of data from a file descriptor.
//

static int				// O - 0 on success, -1 on error
mxml_fd_read(_mxml_fdbuf_t *buf)	// I - File descriptor buffer
{
  int	bytes;				// Bytes read...


  // Range check input...
  if (!buf)
    return (-1);

  // Read from the file descriptor...
  while ((bytes = (int)read(buf->fd, buf->buffer, sizeof(buf->buffer))) < 0)
  {
#ifdef EINTR
    if (errno != EAGAIN && errno != EINTR)
#else
    if (errno != EAGAIN)
#endif // EINTR
      return (-1);
  }

  if (bytes == 0)
    return (-1);

  // Update the pointers and return success...
  buf->current = buf->buffer;
  buf->end     = buf->buffer + bytes;

  return (0);
}


//
// 'mxml_fd_write()' - Write a buffer of data to a file descriptor.
//

static int				// O - 0 on success, -1 on error
mxml_fd_write(_mxml_fdbuf_t *buf)	// I - File descriptor buffer
{
  int		bytes;			// Bytes written
  unsigned char	*ptr;			// Pointer into buffer


  // Range check...
  if (!buf)
    return (-1);

  // Return 0 if there is nothing to write...
  if (buf->current == buf->buffer)
    return (0);

  // Loop until we have written everything...
  for (ptr = buf->buffer; ptr < buf->current; ptr += bytes)
  {
    if ((bytes = (int)write(buf->fd, ptr, buf->current - ptr)) < 0)
      return (-1);
  }

  // All done, reset pointers and return success...
  buf->current = buf->buffer;

  return (0);
}


//
// 'mxml_file_getc()' - Get a character from a file.
//

static int				// O  - Character or EOF
mxml_file_getc(void *p,			// I  - Pointer to file
               int  *encoding)		// IO - Encoding
{
  int	ch,				// Character from file
	temp;				// Temporary character
  FILE	*fp;				// Pointer to file


  // Read a character from the file and see if it is EOF or ASCII...
  fp = (FILE *)p;
  ch = getc(fp);

  if (ch == EOF)
    return (EOF);

  switch (*encoding)
  {
    case ENCODE_UTF8 :
        // Got a UTF-8 character; convert UTF-8 to Unicode and return...
	if (!(ch & 0x80))
	{
	  if (mxml_bad_char(ch))
	  {
	    mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	    return (EOF);
	  }

          MXML_DEBUG("mxml_file_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);
	  return (ch);
        }
	else if (ch == 0xfe)
	{
	  // UTF-16 big-endian BOM?
          ch = getc(fp);
	  if (ch != 0xff)
	    return (EOF);

	  *encoding = ENCODE_UTF16BE;

	  return (mxml_file_getc(p, encoding));
	}
	else if (ch == 0xff)
	{
	  // UTF-16 little-endian BOM?
          ch = getc(fp);
	  if (ch != 0xfe)
	    return (EOF);

	  *encoding = ENCODE_UTF16LE;

	  return (mxml_file_getc(p, encoding));
	}
	else if ((ch & 0xe0) == 0xc0)
	{
	  // Two-byte value...
	  if ((temp = getc(fp)) == EOF || (temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = ((ch & 0x1f) << 6) | (temp & 0x3f);

	  if (ch < 0x80)
	  {
	    mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	    return (EOF);
	  }
	}
	else if ((ch & 0xf0) == 0xe0)
	{
	  // Three-byte value...
	  if ((temp = getc(fp)) == EOF || (temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = ((ch & 0x0f) << 6) | (temp & 0x3f);

	  if ((temp = getc(fp)) == EOF || (temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = (ch << 6) | (temp & 0x3f);

	  if (ch < 0x800)
	  {
	    mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	    return (EOF);
	  }

          // Ignore (strip) Byte Order Mark (BOM)...
	  if (ch == 0xfeff)
	    return (mxml_file_getc(p, encoding));
	}
	else if ((ch & 0xf8) == 0xf0)
	{
	  // Four-byte value...
	  if ((temp = getc(fp)) == EOF || (temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = ((ch & 0x07) << 6) | (temp & 0x3f);

	  if ((temp = getc(fp)) == EOF || (temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = (ch << 6) | (temp & 0x3f);

	  if ((temp = getc(fp)) == EOF || (temp & 0xc0) != 0x80)
	    return (EOF);

	  ch = (ch << 6) | (temp & 0x3f);

	  if (ch < 0x10000)
	  {
	    mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	    return (EOF);
	  }
	}
	else
	{
	  return (EOF);
	}
	break;

    case ENCODE_UTF16BE :
        // Read UTF-16 big-endian char...
	ch = (ch << 8) | getc(fp);

	if (mxml_bad_char(ch))
	{
	  mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	  return (EOF);
	}
        else if (ch >= 0xd800 && ch <= 0xdbff)
	{
	  // Multi-word UTF-16 char...
          int lch = getc(fp);
          lch = (lch << 8) | getc(fp);

          if (lch < 0xdc00 || lch >= 0xdfff)
	    return (EOF);

          ch = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
	}
	break;

    case ENCODE_UTF16LE :
        // Read UTF-16 little-endian char...
	ch |= (getc(fp) << 8);

        if (mxml_bad_char(ch))
	{
	  mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	  return (EOF);
	}
        else if (ch >= 0xd800 && ch <= 0xdbff)
	{
	  // Multi-word UTF-16 char...
          int lch = getc(fp);
          lch |= (getc(fp) << 8);

          if (lch < 0xdc00 || lch >= 0xdfff)
	    return (EOF);

          ch = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
	}
	break;
  }

  MXML_DEBUG("mxml_file_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);

  return (ch);
}


//
// 'mxml_file_putc()' - Write a character to a file.
//

static int				// O - 0 on success, -1 on failure
mxml_file_putc(int  ch,			// I - Character to write
               void *p)			// I - Pointer to file
{
  return (putc(ch, (FILE *)p) == EOF ? -1 : 0);
}


//
// 'mxml_get_entity()' - Get the character corresponding to an entity...
//

static int				// O  - Character value or EOF on error
mxml_get_entity(mxml_node_t *parent,	// I  - Parent node
		void        *p,		// I  - Pointer to source
		int         *encoding,	// IO - Character encoding
                int         (*getc_cb)(void *, int *),
					// I  - Get character function
                int         *line)	// IO - Current line number
{
  int	ch;				// Current character
  char	entity[64],			// Entity string
	*entptr;			// Pointer into entity


  entptr = entity;

  while ((ch = (*getc_cb)(p, encoding)) != EOF)
  {
    if (ch > 126 || (!isalnum(ch) && ch != '#'))
    {
      break;
    }
    else if (entptr < (entity + sizeof(entity) - 1))
    {
      *entptr++ = ch;
    }
    else
    {
      mxml_error("Entity name too long under parent <%s> on line %d.", parent ? parent->value.element.name : "null", *line);
      break;
    }
  }

  *entptr = '\0';

  if (ch != ';')
  {
    mxml_error("Character entity '%s' not terminated under parent <%s> on line %d.", entity, parent ? parent->value.element.name : "null", *line);

    if (ch == '\n')
      (*line)++;

    return (EOF);
  }

  if (entity[0] == '#')
  {
    if (entity[1] == 'x')
      ch = (int)strtol(entity + 2, NULL, 16);
    else
      ch = (int)strtol(entity + 1, NULL, 10);
  }
  else if ((ch = mxmlEntityGetValue(entity)) < 0)
  {
    mxml_error("Entity name '%s;' not supported under parent <%s> on line %d.", entity, parent ? parent->value.element.name : "null", *line);
  }

  if (mxml_bad_char(ch))
  {
    mxml_error("Bad control character 0x%02x under parent <%s> on line %d not allowed by XML standard.", ch, parent ? parent->value.element.name : "null", *line);
    return (EOF);
  }

  return (ch);
}


//
// 'mxml_load_data()' - Load data into an XML node tree.
//

static mxml_node_t *			// O - First node or NULL if the file could not be read.
mxml_load_data(
    mxml_node_t     *top,		// I - Top node
    void            *p,			// I - Pointer to data
    mxml_load_cb_t  cb,			// I - Callback function or MXML_NO_CALLBACK
    _mxml_getc_cb_t getc_cb,		// I - Read function
    mxml_sax_cb_t   sax_cb,		// I - SAX callback or MXML_NO_CALLBACK
    void            *sax_data)		// I - SAX user data
{
  mxml_node_t	*node = NULL,		// Current node
		*first = NULL,		// First node added
		*parent = NULL;		// Current parent node
  int		line = 1,		// Current line number
		ch;			// Character from file
  bool		whitespace;		// Whitespace seen?
  char		*buffer,		// String buffer
		*bufptr;		// Pointer into buffer
  int		bufsize;		// Size of buffer
  mxml_type_t	type;			// Current node type
  int		encoding;		// Character encoding
  _mxml_global_t *global = _mxml_global();
					// Global data
  static const char * const types[] =	// Type strings...
		{
		  "MXML_TYPE_CDATA",	// CDATA
		  "MXML_TYPE_COMMENT",	// Comment
		  "MXML_TYPE_DECLARATION",// Declaration
		  "MXML_TYPE_DIRECTIVE",// Processing instruction/directive
		  "MXML_TYPE_ELEMENT",	// XML element with attributes
		  "MXML_TYPE_INTEGER",	// Integer value
		  "MXML_TYPE_OPAQUE",	// Opaque string
		  "MXML_TYPE_REAL",	// Real value
		  "MXML_TYPE_TEXT",	// Text fragment
		  "MXML_TYPE_CUSTOM"	// Custom data
		};


  // Read elements and other nodes from the file...
  if ((buffer = malloc(64)) == NULL)
  {
    mxml_error("Unable to allocate string buffer.");
    return (NULL);
  }

  bufsize    = 64;
  bufptr     = buffer;
  parent     = top;
  first      = NULL;
  whitespace = false;
  encoding   = ENCODE_UTF8;

  if (cb && parent)
    type = (*cb)(parent);
  else if (parent)
    type = MXML_TYPE_TEXT;
  else
    type = MXML_TYPE_IGNORE;

  if ((ch = (*getc_cb)(p, &encoding)) == EOF)
  {
    free(buffer);
    return (NULL);
  }
  else if (ch != '<' && !top)
  {
    free(buffer);
    mxml_error("XML does not start with '<' (saw '%c').", ch);
    return (NULL);
  }

  do
  {
    if ((ch == '<' || (mxml_isspace(ch) && type != MXML_TYPE_OPAQUE && type != MXML_TYPE_CUSTOM)) && bufptr > buffer)
    {
      // Add a new value node...
      *bufptr = '\0';

      switch (type)
      {
	case MXML_TYPE_INTEGER :
            node = mxmlNewInteger(parent, strtol(buffer, &bufptr, 0));
	    break;

	case MXML_TYPE_OPAQUE :
            node = mxmlNewOpaque(parent, buffer);
	    break;

	case MXML_TYPE_REAL :
            node = mxmlNewReal(parent, strtod(buffer, &bufptr));
	    break;

	case MXML_TYPE_TEXT :
            node = mxmlNewText(parent, whitespace, buffer);
	    break;

	case MXML_TYPE_CUSTOM :
	    if (global->custom_load_cb)
	    {
	      // Use the callback to fill in the custom data...
              node = mxmlNewCustom(parent, NULL, NULL);

	      if (!(*global->custom_load_cb)(node, buffer))
	      {
	        mxml_error("Bad custom value '%s' in parent <%s> on line %d.", buffer, parent ? parent->value.element.name : "null", line);
		mxmlDelete(node);
		node = NULL;
	      }
	      break;
	    }

        default : // Ignore...
	    node = NULL;
	    break;
      }

      if (*bufptr)
      {
        // Bad integer/real number value...
        mxml_error("Bad %s value '%s' in parent <%s> on line %d.", type == MXML_TYPE_INTEGER ? "integer" : "real", buffer, parent ? parent->value.element.name : "null", line);
	break;
      }

      bufptr     = buffer;
      whitespace = mxml_isspace(ch) && type == MXML_TYPE_TEXT;

      if (!node && type != MXML_TYPE_IGNORE)
      {
        // Print error and return...
	mxml_error("Unable to add value node of type %s to parent <%s> on line %d.", types[type], parent ? parent->value.element.name : "null", line);
	goto error;
      }

      if (sax_cb)
      {
        (*sax_cb)(node, MXML_SAX_EVENT_DATA, sax_data);

        if (!mxmlRelease(node))
          node = NULL;
      }

      if (!first && node)
        first = node;
    }
    else if (mxml_isspace(ch) && type == MXML_TYPE_TEXT)
    {
      whitespace = true;
    }

    if (ch == '\n')
      line ++;

    // Add lone whitespace node if we have an element and existing whitespace...
    if (ch == '<' && whitespace && type == MXML_TYPE_TEXT)
    {
      if (parent)
      {
	node = mxmlNewText(parent, whitespace, "");

	if (sax_cb)
	{
	  (*sax_cb)(node, MXML_SAX_EVENT_DATA, sax_data);

	  if (!mxmlRelease(node))
	    node = NULL;
	}

	if (!first && node)
	  first = node;
      }

      whitespace = false;
    }

    if (ch == '<')
    {
      // Start of open/close tag...
      bufptr = buffer;

      while ((ch = (*getc_cb)(p, &encoding)) != EOF)
      {
        if (mxml_isspace(ch) || ch == '>' || (ch == '/' && bufptr > buffer))
        {
	  break;
	}
	else if (ch == '<')
	{
	  mxml_error("Bare < in element.");
	  goto error;
	}
	else if (ch == '&')
	{
	  if ((ch = mxml_get_entity(parent, p, &encoding, getc_cb, &line)) == EOF)
	    goto error;

	  if (mxml_add_char(ch, &bufptr, &buffer, &bufsize))
	    goto error;
	}
	else if (ch < '0' && ch != '!' && ch != '-' && ch != '.' && ch != '/')
	{
	  goto error;
	}
	else if (mxml_add_char(ch, &bufptr, &buffer, &bufsize))
	{
	  goto error;
	}
	else if (((bufptr - buffer) == 1 && buffer[0] == '?') || ((bufptr - buffer) == 3 && !strncmp(buffer, "!--", 3)) || ((bufptr - buffer) == 8 && !strncmp(buffer, "![CDATA[", 8)))
	{
	  break;
	}

	if (ch == '\n')
	  line ++;
      }

      *bufptr = '\0';

      if (!strcmp(buffer, "!--"))
      {
        // Gather rest of comment...
	while ((ch = (*getc_cb)(p, &encoding)) != EOF)
	{
	  if (ch == '>' && bufptr > (buffer + 4) && bufptr[-3] != '-' && bufptr[-2] == '-' && bufptr[-1] == '-')
	    break;
	  else if (mxml_add_char(ch, &bufptr, &buffer, &bufsize))
	    goto error;

	  if (ch == '\n')
	    line ++;
	}

        // Error out if we didn't get the whole comment...
        if (ch != '>')
	{
	  // Print error and return...
	  mxml_error("Early EOF in comment node on line %d.", line);
	  goto error;
	}

        // Otherwise add this as an element under the current parent...
	bufptr[-2] = '\0';

        if (!parent && first)
	{
	  // There can only be one root element!
	  mxml_error("<%s--> cannot be a second root node after <%s> on line %d.", buffer, first->value.element.name, line);
          goto error;
	}

	if ((node = mxmlNewComment(parent, buffer + 3)) == NULL)
	{
	  // Just print error for now...
	  mxml_error("Unable to add comment node to parent <%s> on line %d.", parent ? parent->value.element.name : "null", line);
	  break;
	}

        if (sax_cb)
        {
          (*sax_cb)(node, MXML_SAX_EVENT_COMMENT, sax_data);

          if (!mxmlRelease(node))
            node = NULL;
        }

	if (node && !first)
	  first = node;
      }
      else if (!strcmp(buffer, "![CDATA["))
      {
        // Gather CDATA section...
	while ((ch = (*getc_cb)(p, &encoding)) != EOF)
	{
	  if (ch == '>' && !strncmp(bufptr - 2, "]]", 2))
	  {
	    // Drop terminator from CDATA string...
	    bufptr[-2] = '\0';
	    break;
	  }
	  else if (mxml_add_char(ch, &bufptr, &buffer, &bufsize))
	  {
	    goto error;
	  }

	  if (ch == '\n')
	    line ++;
	}

        // Error out if we didn't get the whole comment...
        if (ch != '>')
	{
	  // Print error and return...
	  mxml_error("Early EOF in CDATA node on line %d.", line);
	  goto error;
	}

        // Otherwise add this as an element under the current parent...
	bufptr[-2] = '\0';

        if (!parent && first)
	{
	  // There can only be one root element!
	  mxml_error("<%s]]> cannot be a second root node after <%s> on line %d.", buffer, first->value.element.name, line);
          goto error;
	}

	if ((node = mxmlNewCDATA(parent, buffer + 8)) == NULL)
	{
	  // Print error and return...
	  mxml_error("Unable to add CDATA node to parent <%s> on line %d.", parent ? parent->value.element.name : "null", line);
	  goto error;
	}

        if (sax_cb)
        {
          (*sax_cb)(node, MXML_SAX_EVENT_CDATA, sax_data);

          if (!mxmlRelease(node))
            node = NULL;
        }

	if (node && !first)
	  first = node;
      }
      else if (buffer[0] == '?')
      {
        // Gather rest of processing instruction...
	while ((ch = (*getc_cb)(p, &encoding)) != EOF)
	{
	  if (ch == '>' && bufptr > buffer && bufptr[-1] == '?')
	    break;
	  else if (mxml_add_char(ch, &bufptr, &buffer, &bufsize))
	    goto error;

	  if (ch == '\n')
	    line ++;
	}

        // Error out if we didn't get the whole processing instruction...
        if (ch != '>')
	{
	  // Print error and return...
	  mxml_error("Early EOF in processing instruction node on line %d.", line);
	  goto error;
	}

        // Otherwise add this as an element under the current parent...
	bufptr[-1] = '\0';

        if (!parent && first)
	{
	  // There can only be one root element!
	  mxml_error("<%s?> cannot be a second root node after <%s> on line %d.", buffer, first->value.element.name, line);
          goto error;
	}

	if ((node = mxmlNewDirective(parent, buffer + 1)) == NULL)
	{
	  // Print error and return...
	  mxml_error("Unable to add processing instruction node to parent <%s> on line %d.", parent ? parent->value.element.name : "null", line);
	  goto error;
	}

        if (sax_cb)
        {
          (*sax_cb)(node, MXML_SAX_EVENT_DIRECTIVE, sax_data);

          if (strncmp(node->value.directive, "xml ", 4) && !mxmlRelease(node))
            node = NULL;
        }

        if (node)
	{
	  if (!first)
            first = node;

	  if (!parent)
	  {
	    parent = node;

	    if (cb)
	      type = (*cb)(parent);
	    else
	      type = MXML_TYPE_TEXT;
	  }
	}
      }
      else if (buffer[0] == '!')
      {
        // Gather rest of declaration...
	do
	{
	  if (ch == '>')
	  {
	    break;
	  }
	  else
	  {
            if (ch == '&')
            {
	      if ((ch = mxml_get_entity(parent, p, &encoding, getc_cb, &line)) == EOF)
		goto error;
            }

	    if (mxml_add_char(ch, &bufptr, &buffer, &bufsize))
	      goto error;
	  }

	  if (ch == '\n')
	    line ++;
	}
        while ((ch = (*getc_cb)(p, &encoding)) != EOF);

        // Error out if we didn't get the whole declaration...
        if (ch != '>')
	{
	  // Print error and return...
	  mxml_error("Early EOF in declaration node on line %d.", line);
	  goto error;
	}

        // Otherwise add this as an element under the current parent...
	*bufptr = '\0';

        if (!parent && first)
	{
	  // There can only be one root element!
	  mxml_error("<%s> cannot be a second root node after <%s> on line %d.", buffer, first->value.element.name, line);
          goto error;
	}

	if ((node = mxmlNewDeclaration(parent, buffer + 1)) == NULL)
	{
	  // Print error and return...
	  mxml_error("Unable to add declaration node to parent <%s> on line %d.", parent ? parent->value.element.name : "null", line);
	  goto error;
	}

        if (sax_cb)
        {
          (*sax_cb)(node, MXML_SAX_EVENT_DECLARATION, sax_data);

          if (!mxmlRelease(node))
            node = NULL;
        }

        if (node)
	{
	  if (!first)
            first = node;

	  if (!parent)
	  {
	    parent = node;

	    if (cb)
	      type = (*cb)(parent);
	    else
	      type = MXML_TYPE_TEXT;
	  }
	}
      }
      else if (buffer[0] == '/')
      {
        // Handle close tag...
        if (!parent || strcmp(buffer + 1, parent->value.element.name))
	{
	  // Close tag doesn't match tree; print an error for now...
	  mxml_error("Mismatched close tag <%s> under parent <%s> on line %d.", buffer, parent ? parent->value.element.name : "(null)", line);
          goto error;
	}

        // Keep reading until we see >...
        while (ch != '>' && ch != EOF)
	  ch = (*getc_cb)(p, &encoding);

        node   = parent;
        parent = parent->parent;

        if (sax_cb)
        {
          (*sax_cb)(node, MXML_SAX_EVENT_ELEMENT_CLOSE, sax_data);

          if (!mxmlRelease(node))
          {
            if (first == node)
	      first = NULL;

	    node = NULL;
	  }
        }

        // Ascend into the parent and set the value type as needed...
	if (cb && parent)
	  type = (*cb)(parent);
      }
      else
      {
        // Handle open tag...
        if (!parent && first)
	{
	  // There can only be one root element!
	  mxml_error("<%s> cannot be a second root node after <%s> on line %d.", buffer, first->value.element.name, line);
          goto error;
	}

        if ((node = mxmlNewElement(parent, buffer)) == NULL)
	{
	  // Just print error for now...
	  mxml_error("Unable to add element node to parent <%s> on line %d.", parent ? parent->value.element.name : "null", line);
	  goto error;
	}

        if (mxml_isspace(ch))
        {
	  if ((ch = mxml_parse_element(node, p, &encoding, getc_cb, &line)) == EOF)
	    goto error;
        }
        else if (ch == '/')
	{
	  if ((ch = (*getc_cb)(p, &encoding)) != '>')
	  {
	    mxml_error("Expected > but got '%c' instead for element <%s/> on line %d.", ch, buffer, line);
            mxmlDelete(node);
            node = NULL;
            goto error;
	  }

	  ch = '/';
	}

        if (sax_cb)
          (*sax_cb)(node, MXML_SAX_EVENT_ELEMENT_OPEN, sax_data);

        if (!first)
	  first = node;

	if (ch == EOF)
	  break;

        if (ch != '/')
	{
	  // Descend into this node, setting the value type as needed...
	  parent = node;

	  if (cb && parent)
	    type = (*cb)(parent);
	  else
	    type = MXML_TYPE_TEXT;
	}
        else if (sax_cb)
        {
          (*sax_cb)(node, MXML_SAX_EVENT_ELEMENT_CLOSE, sax_data);

          if (!mxmlRelease(node))
          {
            if (first == node)
	      first = NULL;

	    node = NULL;
	  }
        }
      }

      bufptr  = buffer;
    }
    else if (ch == '&')
    {
      // Add character entity to current buffer...
      if ((ch = mxml_get_entity(parent, p, &encoding, getc_cb, &line)) == EOF)
	goto error;

      if (mxml_add_char(ch, &bufptr, &buffer, &bufsize))
	goto error;
    }
    else if (type == MXML_TYPE_OPAQUE || type == MXML_TYPE_CUSTOM || !mxml_isspace(ch))
    {
      // Add character to current buffer...
      if (mxml_add_char(ch, &bufptr, &buffer, &bufsize))
	goto error;
    }
  }
  while ((ch = (*getc_cb)(p, &encoding)) != EOF);

  // Free the string buffer - we don't need it anymore...
  free(buffer);

  // Find the top element and return it...
  if (parent)
  {
    node = parent;

    while (parent != top && parent->parent)
      parent = parent->parent;

    if (node != parent)
    {
      mxml_error("Missing close tag </%s> under parent <%s> on line %d.", node->value.element.name, node->parent ? node->parent->value.element.name : "(null)", line);

      mxmlDelete(first);

      return (NULL);
    }
  }

  if (parent)
    return (parent);
  else
    return (first);

  // Common error return...
  error:

  mxmlDelete(first);

  free(buffer);

  return (NULL);
}


//
// 'mxml_parse_element()' - Parse an element for any attributes...
//

static int				// O  - Terminating character
mxml_parse_element(
    mxml_node_t     *node,		// I  - Element node
    void            *p,			// I  - Data to read from
    int             *encoding,		// IO - Encoding
    _mxml_getc_cb_t getc_cb,		// I  - Data callback
    int             *line)		// IO - Current line number
{
  int	ch,				// Current character in file
	quote;				// Quoting character
  char	*name,				// Attribute name
	*value,				// Attribute value
	*ptr;				// Pointer into name/value
  int	namesize,			// Size of name string
	valsize;			// Size of value string


  // Initialize the name and value buffers...
  if ((name = malloc(64)) == NULL)
  {
    mxml_error("Unable to allocate memory for name.");
    return (EOF);
  }

  namesize = 64;

  if ((value = malloc(64)) == NULL)
  {
    free(name);
    mxml_error("Unable to allocate memory for value.");
    return (EOF);
  }

  valsize = 64;

  // Loop until we hit a >, /, ?, or EOF...
  while ((ch = (*getc_cb)(p, encoding)) != EOF)
  {
    MXML_DEBUG("parse_element: ch='%c'\n", ch);

    // Skip leading whitespace...
    if (mxml_isspace(ch))
    {
      if (ch == '\n')
        (*line)++;

      continue;
    }

    // Stop at /, ?, or >...
    if (ch == '/' || ch == '?')
    {
      // Grab the > character and print an error if it isn't there...
      quote = (*getc_cb)(p, encoding);

      if (quote != '>')
      {
        mxml_error("Expected '>' after '%c' for element %s, but got '%c' on line %d.", ch, node->value.element.name, quote, *line);
        goto error;
      }

      break;
    }
    else if (ch == '<')
    {
      mxml_error("Bare < in element %s on line %d.", node->value.element.name, *line);
      goto error;
    }
    else if (ch == '>')
    {
      break;
    }

    // Read the attribute name...
    ptr = name;
    if (mxml_add_char(ch, &ptr, &name, &namesize))
      goto error;

    if (ch == '\"' || ch == '\'')
    {
      // Name is in quotes, so get a quoted string...
      quote = ch;

      while ((ch = (*getc_cb)(p, encoding)) != EOF)
      {
        if (ch == '&')
        {
	  if ((ch = mxml_get_entity(node, p, encoding, getc_cb, line)) == EOF)
	    goto error;
	}
	else if (ch == '\n')
	{
	  (*line)++;
	}

	if (mxml_add_char(ch, &ptr, &name, &namesize))
	  goto error;

	if (ch == quote)
          break;
      }
    }
    else
    {
      // Grab an normal, non-quoted name...
      while ((ch = (*getc_cb)(p, encoding)) != EOF)
      {
	if (mxml_isspace(ch) || ch == '=' || ch == '/' || ch == '>' || ch == '?')
	{
	  if (ch == '\n')
	    (*line)++;
          break;
        }
	else
	{
          if (ch == '&')
          {
	    if ((ch = mxml_get_entity(node, p, encoding, getc_cb, line)) == EOF)
	      goto error;
          }

	  if (mxml_add_char(ch, &ptr, &name, &namesize))
	    goto error;
	}
      }
    }

    *ptr = '\0';

    if (mxmlElementGetAttr(node, name))
    {
      mxml_error("Duplicate attribute '%s' in element %s on line %d.", name, node->value.element.name, *line);
      goto error;
    }

    while (ch != EOF && mxml_isspace(ch))
    {
      ch = (*getc_cb)(p, encoding);

      if (ch == '\n')
        (*line)++;
    }

    if (ch == '=')
    {
      // Read the attribute value...
      while ((ch = (*getc_cb)(p, encoding)) != EOF && mxml_isspace(ch))
      {
        if (ch == '\n')
          (*line)++;
      }

      if (ch == EOF)
      {
        mxml_error("Missing value for attribute '%s' in element %s on line %d.", name, node->value.element.name, *line);
        goto error;
      }

      if (ch == '\'' || ch == '\"')
      {
        // Read quoted value...
        quote = ch;
	ptr   = value;

        while ((ch = (*getc_cb)(p, encoding)) != EOF)
        {
	  if (ch == quote)
	  {
	    break;
	  }
	  else
	  {
	    if (ch == '&')
	    {
	      if ((ch = mxml_get_entity(node, p, encoding, getc_cb, line)) == EOF)
	        goto error;
	    }
	    else if (ch == '\n')
	    {
	      (*line)++;
	    }

	    if (mxml_add_char(ch, &ptr, &value, &valsize))
	      goto error;
	  }
	}

        *ptr = '\0';
      }
      else
      {
        // Read unquoted value...
	ptr      = value;
	if (mxml_add_char(ch, &ptr, &value, &valsize))
	  goto error;

	while ((ch = (*getc_cb)(p, encoding)) != EOF)
	{
	  if (mxml_isspace(ch) || ch == '=' || ch == '/' || ch == '>')
	  {
	    if (ch == '\n')
	      (*line)++;

            break;
          }
	  else
	  {
	    if (ch == '&')
	    {
	      if ((ch = mxml_get_entity(node, p, encoding, getc_cb, line)) == EOF)
	        goto error;
	    }

	    if (mxml_add_char(ch, &ptr, &value, &valsize))
	      goto error;
	  }
	}

        *ptr = '\0';
      }

      // Set the attribute with the given string value...
      mxmlElementSetAttr(node, name, value);
    }
    else
    {
      mxml_error("Missing value for attribute '%s' in element %s on line %d.", name, node->value.element.name, *line);
      goto error;
    }

    // Check the end character...
    if (ch == '/' || ch == '?')
    {
      // Grab the > character and print an error if it isn't there...
      quote = (*getc_cb)(p, encoding);

      if (quote != '>')
      {
        mxml_error("Expected '>' after '%c' for element %s, but got '%c' on line %d.", ch, node->value.element.name, quote, *line);
        ch = EOF;
      }

      break;
    }
    else if (ch == '>')
      break;
  }

  // Free the name and value buffers and return...
  free(name);
  free(value);

  return (ch);

  // Common error return point...
  error:

  free(name);
  free(value);

  return (EOF);
}


//
// 'mxml_string_getc()' - Get a character from a string.
//

static int				// O  - Character or EOF
mxml_string_getc(void *p,		// I  - Pointer to file
                 int  *encoding)	// IO - Encoding
{
  int		ch;			// Character
  const char	**s;			// Pointer to string pointer


  s = (const char **)p;

  if ((ch = (*s)[0] & 255) != 0 || *encoding == ENCODE_UTF16LE)
  {
    // Got character; convert UTF-8 to integer and return...
    (*s)++;

    switch (*encoding)
    {
      case ENCODE_UTF8 :
	  if (!(ch & 0x80))
	  {
            MXML_DEBUG("mxml_string_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);

	    if (mxml_bad_char(ch))
	    {
	      mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	      return (EOF);
	    }

	    return (ch);
          }
	  else if (ch == 0xfe)
	  {
	    // UTF-16 big-endian BOM?
            if (((*s)[0] & 255) != 0xff)
	      return (EOF);

	    *encoding = ENCODE_UTF16BE;
	    (*s)++;

	    return (mxml_string_getc(p, encoding));
	  }
	  else if (ch == 0xff)
	  {
	    // UTF-16 little-endian BOM?
            if (((*s)[0] & 255) != 0xfe)
	      return (EOF);

	    *encoding = ENCODE_UTF16LE;
	    (*s)++;

	    return (mxml_string_getc(p, encoding));
	  }
	  else if ((ch & 0xe0) == 0xc0)
	  {
	    // Two-byte value...
	    if (((*s)[0] & 0xc0) != 0x80)
              return (EOF);

	    ch = ((ch & 0x1f) << 6) | ((*s)[0] & 0x3f);

	    (*s)++;

	    if (ch < 0x80)
	    {
	      mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	      return (EOF);
	    }

            MXML_DEBUG("mxml_string_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);
	    return (ch);
	  }
	  else if ((ch & 0xf0) == 0xe0)
	  {
	    // Three-byte value...
	    if (((*s)[0] & 0xc0) != 0x80 || ((*s)[1] & 0xc0) != 0x80)
              return (EOF);

	    ch = ((((ch & 0x0f) << 6) | ((*s)[0] & 0x3f)) << 6) | ((*s)[1] & 0x3f);

	    (*s) += 2;

	    if (ch < 0x800)
	    {
	      mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	      return (EOF);
	    }

	    // Ignore (strip) Byte Order Mark (BOM)...
	    if (ch == 0xfeff)
	      return (mxml_string_getc(p, encoding));

            MXML_DEBUG("mxml_string_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);
	    return (ch);
	  }
	  else if ((ch & 0xf8) == 0xf0)
	  {
	    // Four-byte value...
	    if (((*s)[0] & 0xc0) != 0x80 || ((*s)[1] & 0xc0) != 0x80 || ((*s)[2] & 0xc0) != 0x80)
              return (EOF);

	    ch = ((((((ch & 0x07) << 6) | ((*s)[0] & 0x3f)) << 6) | ((*s)[1] & 0x3f)) << 6) | ((*s)[2] & 0x3f);
	    (*s) += 3;

	    if (ch < 0x10000)
	    {
	      mxml_error("Invalid UTF-8 sequence for character 0x%04x.", ch);
	      return (EOF);
	    }

            MXML_DEBUG("mxml_string_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);
	    return (ch);
	  }
	  else
	  {
	    return (EOF);
	  }

      case ENCODE_UTF16BE :
	  // Read UTF-16 big-endian char...
	  ch = (ch << 8) | ((*s)[0] & 255);
	  (*s) ++;

          if (mxml_bad_char(ch))
	  {
	    mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	    return (EOF);
	  }
          else if (ch >= 0xd800 && ch <= 0xdbff)
	  {
	    // Multi-word UTF-16 char...
            int lch;			// Lower word

            if (!(*s)[0])
	      return (EOF);

            lch = (((*s)[0] & 255) << 8) | ((*s)[1] & 255);
	    (*s) += 2;

            if (lch < 0xdc00 || lch >= 0xdfff)
	      return (EOF);

            ch = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
	  }

          MXML_DEBUG("mxml_string_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);
	  return (ch);

      case ENCODE_UTF16LE :
	  // Read UTF-16 little-endian char...
	  ch = ch | (((*s)[0] & 255) << 8);

	  if (!ch)
	  {
	    (*s) --;
	    return (EOF);
	  }

	  (*s) ++;

          if (mxml_bad_char(ch))
	  {
	    mxml_error("Bad control character 0x%02x not allowed by XML standard.", ch);
	    return (EOF);
	  }
          else if (ch >= 0xd800 && ch <= 0xdbff)
	  {
	    // Multi-word UTF-16 char...
            int lch;			// Lower word

            if (!(*s)[1])
	      return (EOF);

            lch = (((*s)[1] & 255) << 8) | ((*s)[0] & 255);
	    (*s) += 2;

            if (lch < 0xdc00 || lch >= 0xdfff)
	      return (EOF);

            ch = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
	  }

          MXML_DEBUG("mxml_string_getc: %c (0x%04x)\n", ch < ' ' ? '.' : ch, ch);
	  return (ch);
    }
  }

  return (EOF);
}


//
// 'mxml_string_putc()' - Write a character to a string.
//

static int				// O - 0 on success, -1 on failure
mxml_string_putc(int  ch,		// I - Character to write
                 void *p)		// I - Pointer to string pointers
{
  char	**pp;				// Pointer to string pointers


  pp = (char **)p;

  if (pp[0] < pp[1])
    pp[0][0] = ch;

  pp[0] ++;

  return (0);
}


//
// 'mxml_write_name()' - Write a name string.
//

static int				// O - 0 on success, -1 on failure
mxml_write_name(const char *s,		// I - Name to write
                void       *p,		// I - Write pointer
		int        (*putc_cb)(int, void *))
					// I - Write callback
{
  char		quote;			// Quote character
  const char	*name;			// Entity name


  if (*s == '\"' || *s == '\'')
  {
    // Write a quoted name string...
    if ((*putc_cb)(*s, p) < 0)
      return (-1);

    quote = *s++;

    while (*s && *s != quote)
    {
      if ((name = mxmlEntityGetName(*s)) != NULL)
      {
	if ((*putc_cb)('&', p) < 0)
          return (-1);

        while (*name)
	{
	  if ((*putc_cb)(*name, p) < 0)
            return (-1);

          name ++;
	}

	if ((*putc_cb)(';', p) < 0)
          return (-1);
      }
      else if ((*putc_cb)(*s, p) < 0)
      {
	return (-1);
      }

      s ++;
    }

    // Write the end quote...
    if ((*putc_cb)(quote, p) < 0)
      return (-1);
  }
  else
  {
    // Write a non-quoted name string...
    while (*s)
    {
      if ((*putc_cb)(*s, p) < 0)
	return (-1);

      s ++;
    }
  }

  return (0);
}


//
// 'mxml_write_node()' - Save an XML node to a file.
//

static int				// O - Column or -1 on error
mxml_write_node(mxml_node_t     *node,	// I - Node to write
                void            *p,	// I - File to write to
	        mxml_save_cb_t  cb,	// I - Whitespace callback
		int             col,	// I - Current column
		_mxml_putc_cb_t putc_cb,// I - Output callback
		_mxml_global_t  *global)// I - Global data
{
  mxml_node_t	*current,		// Current node
		*next;			// Next node
  int		i,			// Looping var
		width;			// Width of attr + value
  _mxml_attr_t	*attr;			// Current attribute
  char		s[255];			// Temporary string
  const char	*ptr;			// Pointer into string


  // Loop through this node and all of its children...
  for (current = node; current; current = next)
  {
    // Print the node value...
    switch (current->type)
    {
      case MXML_TYPE_CDATA :
	  col = mxml_write_ws(current, p, cb, MXML_WS_BEFORE_OPEN, col, putc_cb);

	  if ((*putc_cb)('<', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('!', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('[', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('C', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('D', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('A', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('T', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('A', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('[', p) < 0)
	    return (-1);
	  else
	    col ++;
	  for (ptr = current->value.cdata; *ptr; ptr ++)
	  {
	    if ((*putc_cb)(*ptr, p) < 0)
	      return (-1);
	    else if (*ptr == '\n')
	      col = 0;
	    else
	      col ++;
	  }
	  if ((*putc_cb)(']', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)(']', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('>', p) < 0)
	    return (-1);
	  else
	    col ++;

	  col = mxml_write_ws(current, p, cb, MXML_WS_AFTER_OPEN, col, putc_cb);
          break;

      case MXML_TYPE_COMMENT :
	  col = mxml_write_ws(current, p, cb, MXML_WS_BEFORE_OPEN, col, putc_cb);

	  if ((*putc_cb)('<', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('!', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('-', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('-', p) < 0)
	    return (-1);
	  else
	    col ++;
	  for (ptr = current->value.comment; *ptr; ptr ++)
	  {
	    if ((*putc_cb)(*ptr, p) < 0)
	      return (-1);
	    else if (*ptr == '\n')
	      col = 0;
	    else
	      col ++;
	  }
	  if ((*putc_cb)('-', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('-', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('>', p) < 0)
	    return (-1);
	  else
	    col ++;

	  col = mxml_write_ws(current, p, cb, MXML_WS_AFTER_OPEN, col, putc_cb);
          break;

      case MXML_TYPE_DECLARATION :
	  col = mxml_write_ws(current, p, cb, MXML_WS_BEFORE_OPEN, col, putc_cb);

	  if ((*putc_cb)('<', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('!', p) < 0)
	    return (-1);
	  else
	    col ++;
	  for (ptr = current->value.declaration; *ptr; ptr ++)
	  {
	    if ((*putc_cb)(*ptr, p) < 0)
	      return (-1);
	    else if (*ptr == '\n')
	      col = 0;
	    else
	      col ++;
	  }
	  if ((*putc_cb)('>', p) < 0)
	    return (-1);
	  else
	    col ++;

	  col = mxml_write_ws(current, p, cb, MXML_WS_AFTER_OPEN, col, putc_cb);
          break;

      case MXML_TYPE_DIRECTIVE :
	  col = mxml_write_ws(current, p, cb, MXML_WS_BEFORE_OPEN, col, putc_cb);

	  if ((*putc_cb)('<', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('?', p) < 0)
	    return (-1);
	  else
	    col ++;
	  for (ptr = current->value.directive; *ptr; ptr ++)
	  {
	    if ((*putc_cb)(*ptr, p) < 0)
	      return (-1);
	    else if (*ptr == '\n')
	      col = 0;
	    else
	      col ++;
	  }
	  if ((*putc_cb)('?', p) < 0)
	    return (-1);
	  else
	    col ++;
	  if ((*putc_cb)('>', p) < 0)
	    return (-1);
	  else
	    col ++;

	  col = mxml_write_ws(current, p, cb, MXML_WS_AFTER_OPEN, col, putc_cb);
          break;

      case MXML_TYPE_ELEMENT :
	  col = mxml_write_ws(current, p, cb, MXML_WS_BEFORE_OPEN, col, putc_cb);

	  if ((*putc_cb)('<', p) < 0)
	    return (-1);
	  else if (mxml_write_name(current->value.element.name, p, putc_cb) < 0)
	    return (-1);

	  col += strlen(current->value.element.name) + 1;

	  for (i = current->value.element.num_attrs, attr = current->value.element.attrs; i > 0; i --, attr ++)
	  {
	    width = (int)strlen(attr->name);

	    if (attr->value)
	      width += strlen(attr->value) + 3;

	    if (global->wrap > 0 && (col + width) > global->wrap)
	    {
	      if ((*putc_cb)('\n', p) < 0)
		return (-1);

	      col = 0;
	    }
	    else
	    {
	      if ((*putc_cb)(' ', p) < 0)
		return (-1);

	      col ++;
	    }

	    if (mxml_write_name(attr->name, p, putc_cb) < 0)
	      return (-1);

	    if (attr->value)
	    {
	      if ((*putc_cb)('=', p) < 0)
		return (-1);
	      if ((*putc_cb)('\"', p) < 0)
		return (-1);
	      if (mxml_write_string(attr->value, p, putc_cb) < 0)
		return (-1);
	      if ((*putc_cb)('\"', p) < 0)
		return (-1);
	    }

	    col += width;
	  }

	  if (current->child)
	  {
	    // Write children...
	    if ((*putc_cb)('>', p) < 0)
	      return (-1);
	    else
	      col ++;

	    col = mxml_write_ws(current, p, cb, MXML_WS_AFTER_OPEN, col, putc_cb);
	  }
	  else
	  {
	    if ((*putc_cb)('/', p) < 0)
	      return (-1);
	    if ((*putc_cb)('>', p) < 0)
	      return (-1);

	    col += 2;
	    col = mxml_write_ws(current, p, cb, MXML_WS_AFTER_OPEN, col, putc_cb);
	  }
	  break;

      case MXML_TYPE_INTEGER :
	  if (current->prev)
	  {
	    if (global->wrap > 0 && col > global->wrap)
	    {
	      if ((*putc_cb)('\n', p) < 0)
		return (-1);

	      col = 0;
	    }
	    else if ((*putc_cb)(' ', p) < 0)
	    {
	      return (-1);
	    }
	    else
	    {
	      col ++;
	    }
	  }

	  snprintf(s, sizeof(s), "%ld", current->value.integer);
	  if (mxml_write_string(s, p, putc_cb) < 0)
	    return (-1);

	  col += strlen(s);
	  break;

      case MXML_TYPE_OPAQUE :
	  if (mxml_write_string(current->value.opaque, p, putc_cb) < 0)
	    return (-1);

	  col += strlen(current->value.opaque);
	  break;

      case MXML_TYPE_REAL :
	  if (current->prev)
	  {
	    if (global->wrap > 0 && col > global->wrap)
	    {
	      if ((*putc_cb)('\n', p) < 0)
		return (-1);

	      col = 0;
	    }
	    else if ((*putc_cb)(' ', p) < 0)
	    {
	      return (-1);
	    }
	    else
	    {
	      col ++;
	    }
	  }

          // TODO: Provide locale-neutral formatting/scanning code for REAL
	  snprintf(s, sizeof(s), "%f", current->value.real);
	  if (mxml_write_string(s, p, putc_cb) < 0)
	    return (-1);

	  col += strlen(s);
	  break;

      case MXML_TYPE_TEXT :
	  if (current->value.text.whitespace && col > 0)
	  {
	    if (global->wrap > 0 && col > global->wrap)
	    {
	      if ((*putc_cb)('\n', p) < 0)
		return (-1);

	      col = 0;
	    }
	    else if ((*putc_cb)(' ', p) < 0)
	    {
	      return (-1);
	    }
	    else
	    {
	      col ++;
	    }
	  }

	  if (mxml_write_string(current->value.text.string, p, putc_cb) < 0)
	    return (-1);

	  col += strlen(current->value.text.string);
	  break;

      case MXML_TYPE_CUSTOM :
	  if (global->custom_save_cb)
	  {
	    char	*data;		// Custom data string
	    const char	*newline;	// Last newline in string


	    if ((data = (*global->custom_save_cb)(current)) == NULL)
	      return (-1);

	    if (mxml_write_string(data, p, putc_cb) < 0)
	      return (-1);

	    if ((newline = strrchr(data, '\n')) == NULL)
	      col += strlen(data);
	    else
	      col = (int)strlen(newline);

	    free(data);
	    break;
	  }

      default : // Should never happen
	  return (-1);
    }

    // Figure out the next node...
    if ((next = current->child) == NULL)
    {
      if (current == node)
      {
        // Don't traverse to sibling node if we are at the "root" node...
        next = NULL;
      }
      else
      {
        // Try the next sibling, and continue traversing upwards as needed...
	while ((next = current->next) == NULL)
	{
	  if (current == node || !current->parent)
	    break;

	  // Declarations and directives have no end tags...
	  current = current->parent;

	  if (current->type == MXML_TYPE_ELEMENT)
	  {
	    col = mxml_write_ws(current, p, cb, MXML_WS_BEFORE_CLOSE, col, putc_cb);

	    if ((*putc_cb)('<', p) < 0)
	      return (-1);
	    if ((*putc_cb)('/', p) < 0)
	      return (-1);
	    if (mxml_write_string(current->value.element.name, p, putc_cb) < 0)
	      return (-1);
	    if ((*putc_cb)('>', p) < 0)
	      return (-1);

	    col += strlen(current->value.element.name) + 3;

	    col = mxml_write_ws(current, p, cb, MXML_WS_AFTER_CLOSE, col, putc_cb);
	  }

	  if (current == node)
	    break;
	}
      }
    }
  }

  return (col);
}


//
// 'mxml_write_string()' - Write a string, escaping & and < as needed.
//

static int				// O - 0 on success, -1 on failure
mxml_write_string(
    const char      *s,			// I - String to write
    void            *p,			// I - Write pointer
    _mxml_putc_cb_t putc_cb)		// I - Write callback
{
  const char	*name;			// Entity name, if any


  while (*s)
  {
    if ((name = mxmlEntityGetName(*s)) != NULL)
    {
      if ((*putc_cb)('&', p) < 0)
        return (-1);

      while (*name)
      {
	if ((*putc_cb)(*name, p) < 0)
          return (-1);
        name ++;
      }

      if ((*putc_cb)(';', p) < 0)
        return (-1);
    }
    else if ((*putc_cb)(*s, p) < 0)
    {
      return (-1);
    }

    s ++;
  }

  return (0);
}


//
// 'mxml_write_ws()' - Do whitespace callback...
//

static int				// O - New column
mxml_write_ws(mxml_node_t     *node,	// I - Current node
              void            *p,	// I - Write pointer
              mxml_save_cb_t  cb,	// I - Callback function
	      int             ws,	// I - Where value
	      int             col,	// I - Current column
              _mxml_putc_cb_t putc_cb)	// I - Write callback
{
  const char	*s;			// Whitespace string


  if (cb && (s = (*cb)(node, ws)) != NULL)
  {
    while (*s)
    {
      if ((*putc_cb)(*s, p) < 0)
      {
	return (-1);
      }
      else if (*s == '\n')
      {
	col = 0;
      }
      else if (*s == '\t')
      {
	col += MXML_TAB;
	col = col - (col % MXML_TAB);
      }
      else
      {
	col ++;
      }

      s ++;
    }
  }

  return (col);
}