mxml/testmxml.c

/*
 * Test program for Mini-XML, a small XML file parsing library.
 *
 * Usage:
 *
 *   ./testmxml input.xml [string-output.xml] >stdio-output.xml
 *   ./testmxml "<?xml ..." [string-output.xml] >stdio-output.xml
 *
 * https://www.msweet.org/mxml
 *
 * Copyright © 2003-2019 by Michael R Sweet.
 *
 * Licensed under Apache License v2.0.  See the file "LICENSE" for more
 * information.
 */

/*
 * Include necessary headers...
 */

#include "config.h"
#include "mxml-private.h"
#ifndef _WIN32
#  include <unistd.h>
#endif /* !_WIN32 */
#include <fcntl.h>
#ifndef O_BINARY
#  define O_BINARY 0
#endif /* !O_BINARY */


/*
 * Globals...
 */

int		event_counts[6];


/*
 * Local functions...
 */

void		sax_cb(mxml_node_t *node, mxml_sax_event_t event, void *data);
mxml_type_t	type_cb(mxml_node_t *node);
const char	*whitespace_cb(mxml_node_t *node, int where);


/*
 * 'main()' - Main entry for test program.
 */

int					/* O - Exit status */
main(int  argc,				/* I - Number of command-line args */
     char *argv[])			/* I - Command-line args */
{
  int			i;		/* Looping var */
  FILE			*fp;		/* File to read */
  int			fd;		/* File descriptor */
  mxml_node_t		*xml,		/* <?xml ...?> node */
			*tree,		/* Element tree */
			*node;		/* Node which should be in test.xml */
  mxml_index_t		*ind;		/* XML index */
  char			buffer[16384];	/* Save string */
  static const char	*types[] =	/* Strings for node types */
			{
			  "MXML_ELEMENT",
			  "MXML_INTEGER",
			  "MXML_OPAQUE",
			  "MXML_REAL",
			  "MXML_TEXT"
			};


 /*
  * Check arguments...
  */

  if (argc != 2 && argc != 3)
  {
    fputs("Usage: testmxml filename.xml [string-output.xml]\n", stderr);
    return (1);
  }

 /*
  * Test the basic functionality...
  */

  xml  = mxmlNewXML("1.0");
  tree = mxmlNewElement(xml, "element");

  if (!tree)
  {
    fputs("ERROR: No parent node in basic test.\n", stderr);
    return (1);
  }

  if (tree->type != MXML_ELEMENT)
  {
    fprintf(stderr, "ERROR: Parent has type %s (%d), expected MXML_ELEMENT.\n",
            tree->type < MXML_ELEMENT || tree->type > MXML_TEXT ?
	        "UNKNOWN" : types[tree->type], tree->type);
    mxmlDelete(tree);
    return (1);
  }

  if (strcmp(tree->value.element.name, "element"))
  {
    fprintf(stderr, "ERROR: Parent value is \"%s\", expected \"element\".\n",
            tree->value.element.name);
    mxmlDelete(tree);
    return (1);
  }

  mxmlNewInteger(tree, 123);
  mxmlNewOpaque(tree, "opaque");
  mxmlNewReal(tree, 123.4f);
  mxmlNewText(tree, 1, "text");

  mxmlLoadString(tree, "<group type='string'>string string string</group>",
                 MXML_NO_CALLBACK);
  mxmlLoadString(tree, "<group type='integer'>1 2 3</group>",
                 MXML_INTEGER_CALLBACK);
  mxmlLoadString(tree, "<group type='real'>1.0 2.0 3.0</group>",
                 MXML_REAL_CALLBACK);
  mxmlLoadString(tree, "<group>opaque opaque opaque</group>",
                 MXML_OPAQUE_CALLBACK);
  mxmlLoadString(tree, "<foo><bar><one><two>value<two>value2</two></two></one>"
                       "</bar></foo>", MXML_OPAQUE_CALLBACK);
  mxmlNewCDATA(tree,
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n");
  mxmlNewCDATA(tree,
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n");
  mxmlNewCDATA(tree,
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n"
               "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\n");

  node = tree->child;

  if (!node)
  {
    fputs("ERROR: No first child node in basic test.\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  if (node->type != MXML_INTEGER)
  {
    fprintf(stderr, "ERROR: First child has type %s (%d), expected MXML_INTEGER.\n",
            node->type < MXML_ELEMENT || node->type > MXML_TEXT ?
	        "UNKNOWN" : types[node->type], node->type);
    mxmlDelete(tree);
    return (1);
  }

  if (node->value.integer != 123)
  {
    fprintf(stderr, "ERROR: First child value is %d, expected 123.\n",
            node->value.integer);
    mxmlDelete(tree);
    return (1);
  }

  node = node->next;

  if (!node)
  {
    fputs("ERROR: No second child node in basic test.\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  if (node->type != MXML_OPAQUE)
  {
    fprintf(stderr, "ERROR: Second child has type %s (%d), expected MXML_OPAQUE.\n",
            node->type < MXML_ELEMENT || node->type > MXML_TEXT ?
	        "UNKNOWN" : types[node->type], node->type);
    mxmlDelete(tree);
    return (1);
  }

  if (!node->value.opaque || strcmp(node->value.opaque, "opaque"))
  {
    fprintf(stderr, "ERROR: Second child value is \"%s\", expected \"opaque\".\n",
            node->value.opaque ? node->value.opaque : "(null)");
    mxmlDelete(tree);
    return (1);
  }

  node = node->next;

  if (!node)
  {
    fputs("ERROR: No third child node in basic test.\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  if (node->type != MXML_REAL)
  {
    fprintf(stderr, "ERROR: Third child has type %s (%d), expected MXML_REAL.\n",
            node->type < MXML_ELEMENT || node->type > MXML_TEXT ?
	        "UNKNOWN" : types[node->type], node->type);
    mxmlDelete(tree);
    return (1);
  }

  if (node->value.real != 123.4f)
  {
    fprintf(stderr, "ERROR: Third child value is %f, expected 123.4.\n",
            node->value.real);
    mxmlDelete(tree);
    return (1);
  }

  node = node->next;

  if (!node)
  {
    fputs("ERROR: No fourth child node in basic test.\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  if (node->type != MXML_TEXT)
  {
    fprintf(stderr, "ERROR: Fourth child has type %s (%d), expected MXML_TEXT.\n",
            node->type < MXML_ELEMENT || node->type > MXML_TEXT ?
	        "UNKNOWN" : types[node->type], node->type);
    mxmlDelete(tree);
    return (1);
  }

  if (!node->value.text.whitespace ||
      !node->value.text.string || strcmp(node->value.text.string, "text"))
  {
    fprintf(stderr, "ERROR: Fourth child value is %d,\"%s\", expected 1,\"text\".\n",
            node->value.text.whitespace,
	    node->value.text.string ? node->value.text.string : "(null)");
    mxmlDelete(tree);
    return (1);
  }

  for (i = 0; i < 4; i ++)
  {
    node = node->next;

    if (!node)
    {
      fprintf(stderr, "ERROR: No group #%d child node in basic test.\n", i + 1);
      mxmlDelete(tree);
      return (1);
    }

    if (node->type != MXML_ELEMENT)
    {
      fprintf(stderr, "ERROR: Group child #%d has type %s (%d), expected MXML_ELEMENT.\n",
              i + 1, node->type < MXML_ELEMENT || node->type > MXML_TEXT ?
	                 "UNKNOWN" : types[node->type], node->type);
      mxmlDelete(tree);
      return (1);
    }
  }

 /*
  * Test mxmlFindPath...
  */

  node = mxmlFindPath(tree, "*/two");
  if (!node)
  {
    fputs("ERROR: Unable to find value for \"*/two\".\n", stderr);
    mxmlDelete(tree);
    return (1);
  }
  else if (node->type != MXML_OPAQUE || strcmp(node->value.opaque, "value"))
  {
    fputs("ERROR: Bad value for \"*/two\".\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  node = mxmlFindPath(tree, "foo/*/two");
  if (!node)
  {
    fputs("ERROR: Unable to find value for \"foo/*/two\".\n", stderr);
    mxmlDelete(tree);
    return (1);
  }
  else if (node->type != MXML_OPAQUE || strcmp(node->value.opaque, "value"))
  {
    fputs("ERROR: Bad value for \"foo/*/two\".\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  node = mxmlFindPath(tree, "foo/bar/one/two");
  if (!node)
  {
    fputs("ERROR: Unable to find value for \"foo/bar/one/two\".\n", stderr);
    mxmlDelete(tree);
    return (1);
  }
  else if (node->type != MXML_OPAQUE || strcmp(node->value.opaque, "value"))
  {
    fputs("ERROR: Bad value for \"foo/bar/one/two\".\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

 /*
  * Test indices...
  */

  ind = mxmlIndexNew(tree, NULL, NULL);
  if (!ind)
  {
    fputs("ERROR: Unable to create index of all nodes.\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  if (ind->num_nodes != 13)
  {
    fprintf(stderr, "ERROR: Index of all nodes contains %d "
                    "nodes; expected 13.\n", ind->num_nodes);
    mxmlIndexDelete(ind);
    mxmlDelete(tree);
    return (1);
  }

  mxmlIndexReset(ind);
  if (!mxmlIndexFind(ind, "group", NULL))
  {
    fputs("ERROR: mxmlIndexFind for \"group\" failed.\n", stderr);
    mxmlIndexDelete(ind);
    mxmlDelete(tree);
    return (1);
  }

  mxmlIndexDelete(ind);

  ind = mxmlIndexNew(tree, "group", NULL);
  if (!ind)
  {
    fputs("ERROR: Unable to create index of groups.\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  if (ind->num_nodes != 4)
  {
    fprintf(stderr, "ERROR: Index of groups contains %d "
                    "nodes; expected 4.\n", ind->num_nodes);
    mxmlIndexDelete(ind);
    mxmlDelete(tree);
    return (1);
  }

  mxmlIndexReset(ind);
  if (!mxmlIndexEnum(ind))
  {
    fputs("ERROR: mxmlIndexEnum failed.\n", stderr);
    mxmlIndexDelete(ind);
    mxmlDelete(tree);
    return (1);
  }

  mxmlIndexDelete(ind);

  ind = mxmlIndexNew(tree, NULL, "type");
  if (!ind)
  {
    fputs("ERROR: Unable to create index of type attributes.\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  if (ind->num_nodes != 3)
  {
    fprintf(stderr, "ERROR: Index of type attributes contains %d "
                    "nodes; expected 3.\n", ind->num_nodes);
    mxmlIndexDelete(ind);
    mxmlDelete(tree);
    return (1);
  }

  mxmlIndexReset(ind);
  if (!mxmlIndexFind(ind, NULL, "string"))
  {
    fputs("ERROR: mxmlIndexFind for \"string\" failed.\n", stderr);
    mxmlIndexDelete(ind);
    mxmlDelete(tree);
    return (1);
  }

  mxmlIndexDelete(ind);

  ind = mxmlIndexNew(tree, "group", "type");
  if (!ind)
  {
    fputs("ERROR: Unable to create index of elements and attributes.\n", stderr);
    mxmlDelete(tree);
    return (1);
  }

  if (ind->num_nodes != 3)
  {
    fprintf(stderr, "ERROR: Index of elements and attributes contains %d "
                    "nodes; expected 3.\n", ind->num_nodes);
    mxmlIndexDelete(ind);
    mxmlDelete(tree);
    return (1);
  }

  mxmlIndexReset(ind);
  if (!mxmlIndexFind(ind, "group", "string"))
  {
    fputs("ERROR: mxmlIndexFind for \"string\" failed.\n", stderr);
    mxmlIndexDelete(ind);
    mxmlDelete(tree);
    return (1);
  }

  mxmlIndexDelete(ind);

 /*
  * Check the mxmlDelete() works properly...
  */

  for (i = 0; i < 12; i ++)
  {
    if (tree->child)
      mxmlDelete(tree->child);
    else
    {
      fprintf(stderr, "ERROR: Child pointer prematurely NULL on child #%d\n",
              i + 1);
      mxmlDelete(tree);
      return (1);
    }
  }

  if (tree->child)
  {
    fputs("ERROR: Child pointer not NULL after deleting all children.\n", stderr);
    return (1);
  }

  if (tree->last_child)
  {
    fputs("ERROR: Last child pointer not NULL after deleting all children.\n", stderr);
    return (1);
  }

  mxmlDelete(xml);

 /*
  * Open the file/string using the default (MXML_NO_CALLBACK) callback...
  */

  if (argv[1][0] == '<')
    xml = mxmlLoadString(NULL, argv[1], MXML_NO_CALLBACK);
  else if ((fp = fopen(argv[1], "rb")) == NULL)
  {
    perror(argv[1]);
    return (1);
  }
  else
  {
   /*
    * Read the file...
    */

    xml = mxmlLoadFile(NULL, fp, MXML_NO_CALLBACK);

    fclose(fp);
  }

  if (!xml)
  {
    fputs("Unable to read XML file with default callback.\n", stderr);
    return (1);
  }

  if (!strcmp(argv[1], "test.xml"))
  {
    const char	*text;			/* Text value */

   /*
    * Verify that mxmlFindElement() and indirectly mxmlWalkNext() work
    * properly...
    */

    if ((node = mxmlFindPath(xml, "group/option/keyword")) == NULL)
    {
      fputs("Unable to find group/option/keyword element in XML tree.\n", stderr);
      mxmlDelete(tree);
      return (1);
    }

    if (node->type != MXML_TEXT)
    {
      fputs("No child node of group/option/keyword.\n", stderr);
      mxmlSaveFile(xml, stderr, MXML_NO_CALLBACK);
      mxmlDelete(xml);
      return (1);
    }

    if ((text = mxmlGetText(node, NULL)) == NULL || strcmp(text, "InputSlot"))
    {
      fprintf(stderr, "Child node of group/option/value has value \"%s\" instead of \"InputSlot\".\n", text ? text : "(null)");
      mxmlDelete(xml);
      return (1);
    }
  }

  mxmlDelete(xml);

 /*
  * Open the file...
  */

  if (argv[1][0] == '<')
    xml = mxmlLoadString(NULL, argv[1], type_cb);
  else if ((fp = fopen(argv[1], "rb")) == NULL)
  {
    perror(argv[1]);
    return (1);
  }
  else
  {
   /*
    * Read the file...
    */

    xml = mxmlLoadFile(NULL, fp, type_cb);

    fclose(fp);
  }

  if (!xml)
  {
    fputs("Unable to read XML file.\n", stderr);
    return (1);
  }

  if (!strcmp(argv[1], "test.xml"))
  {
   /*
    * Verify that mxmlFindElement() and indirectly mxmlWalkNext() work
    * properly...
    */

    if ((node = mxmlFindElement(xml, xml, "choice", NULL, NULL,
                                MXML_DESCEND)) == NULL)
    {
      fputs("Unable to find first <choice> element in XML tree.\n", stderr);
      mxmlDelete(tree);
      return (1);
    }

    if (!mxmlFindElement(node, xml, "choice", NULL, NULL, MXML_NO_DESCEND))
    {
      fputs("Unable to find second <choice> element in XML tree.\n", stderr);
      mxmlDelete(tree);
      return (1);
    }
  }

 /*
  * Print the XML tree...
  */

  mxmlSaveFile(xml, stdout, whitespace_cb);

 /*
  * Save the XML tree to a string and print it...
  */

  if (mxmlSaveString(xml, buffer, sizeof(buffer), whitespace_cb) > 0)
  {
    if (argc == 3)
    {
      fp = fopen(argv[2], "w");
      fputs(buffer, fp);
      fclose(fp);
    }
  }

 /*
  * Delete the tree...
  */

  mxmlDelete(xml);

 /*
  * Read from/write to file descriptors...
  */

  if (argv[1][0] != '<')
  {
   /*
    * Open the file again...
    */

    if ((fd = open(argv[1], O_RDONLY | O_BINARY)) < 0)
    {
      perror(argv[1]);
      return (1);
    }

   /*
    * Read the file...
    */

    xml = mxmlLoadFd(NULL, fd, type_cb);

    close(fd);

   /*
    * Create filename.xmlfd...
    */

    snprintf(buffer, sizeof(buffer), "%sfd", argv[1]);

    if ((fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666)) < 0)
    {
      perror(buffer);
      mxmlDelete(tree);
      return (1);
    }

   /*
    * Write the file...
    */

    mxmlSaveFd(xml, fd, whitespace_cb);

    close(fd);

   /*
    * Delete the tree...
    */

    mxmlDelete(xml);
  }

 /*
  * Test SAX methods...
  */

  memset(event_counts, 0, sizeof(event_counts));

  if (argv[1][0] == '<')
    mxmlSAXLoadString(NULL, argv[1], type_cb, sax_cb, NULL);
  else if ((fp = fopen(argv[1], "rb")) == NULL)
  {
    perror(argv[1]);
    return (1);
  }
  else
  {
   /*
    * Read the file...
    */

    mxmlSAXLoadFile(NULL, fp, type_cb, sax_cb, NULL);

    fclose(fp);
  }

  if (!strcmp(argv[1], "test.xml"))
  {
    if (event_counts[MXML_SAX_CDATA] != 1)
    {
      fprintf(stderr, "MXML_SAX_CDATA seen %d times, expected 1 times.\n",
              event_counts[MXML_SAX_CDATA]);
      return (1);
    }

    if (event_counts[MXML_SAX_COMMENT] != 1)
    {
      fprintf(stderr, "MXML_SAX_COMMENT seen %d times, expected 1 times.\n",
              event_counts[MXML_SAX_COMMENT]);
      return (1);
    }

    if (event_counts[MXML_SAX_DATA] != 61)
    {
      fprintf(stderr, "MXML_SAX_DATA seen %d times, expected 61 times.\n",
              event_counts[MXML_SAX_DATA]);
      return (1);
    }

    if (event_counts[MXML_SAX_DIRECTIVE] != 1)
    {
      fprintf(stderr, "MXML_SAX_DIRECTIVE seen %d times, expected 1 times.\n",
              event_counts[MXML_SAX_DIRECTIVE]);
      return (1);
    }

    if (event_counts[MXML_SAX_ELEMENT_CLOSE] != 20)
    {
      fprintf(stderr, "MXML_SAX_ELEMENT_CLOSE seen %d times, expected 20 times.\n",
              event_counts[MXML_SAX_ELEMENT_CLOSE]);
      return (1);
    }

    if (event_counts[MXML_SAX_ELEMENT_OPEN] != 20)
    {
      fprintf(stderr, "MXML_SAX_ELEMENT_OPEN seen %d times, expected 20 times.\n",
              event_counts[MXML_SAX_ELEMENT_OPEN]);
      return (1);
    }
  }

#ifndef _WIN32
 /*
  * Debug hooks...
  */

  if (getenv("TEST_DELAY") != NULL)
    sleep(atoi(getenv("TEST_DELAY")));
#  ifdef __APPLE__
  if (getenv("TEST_LEAKS") != NULL)
  {
    char command[1024];

    snprintf(command, sizeof(command), "leaks %d", (int)getpid());
    if (system(command))
      puts("Unable to check for leaks.");
  }
#  endif /* __APPLE__ */
#endif /* !_WIN32 */

 /*
  * Return...
  */

  return (0);
}


/*
 * 'sax_cb()' - Process nodes via SAX.
 */

void
sax_cb(mxml_node_t      *node,		/* I - Current node */
       mxml_sax_event_t event,		/* I - SAX event */
       void             *data)		/* I - SAX user data */
{
  static const char * const events[] =	/* Events */
  {
    "MXML_SAX_CDATA",			/* CDATA node */
    "MXML_SAX_COMMENT",			/* Comment node */
    "MXML_SAX_DATA",			/* Data node */
    "MXML_SAX_DIRECTIVE",		/* Processing directive node */
    "MXML_SAX_ELEMENT_CLOSE",		/* Element closed */
    "MXML_SAX_ELEMENT_OPEN"		/* Element opened */
  };


  (void)data;

 /*
  * This SAX callback just counts the different events.
  */

  if (!node)
    fprintf(stderr, "ERROR: SAX callback for event %s has NULL node.\n", events[event]);

  event_counts[event] ++;
}


/*
 * 'type_cb()' - XML data type callback for mxmlLoadFile()...
 */

mxml_type_t				/* O - Data type */
type_cb(mxml_node_t *node)		/* I - Element node */
{
  const char	*type;			/* Type string */


 /*
  * You can lookup attributes and/or use the element name, hierarchy, etc...
  */

  if ((type = mxmlElementGetAttr(node, "type")) == NULL)
    type = node->value.element.name;

  if (!strcmp(type, "integer"))
    return (MXML_INTEGER);
  else if (!strcmp(type, "opaque") || !strcmp(type, "pre"))
    return (MXML_OPAQUE);
  else if (!strcmp(type, "real"))
    return (MXML_REAL);
  else
    return (MXML_TEXT);
}


/*
 * 'whitespace_cb()' - Let the mxmlSaveFile() function know when to insert
 *                     newlines and tabs...
 */

const char *				/* O - Whitespace string or NULL */
whitespace_cb(mxml_node_t *node,	/* I - Element node */
              int         where)	/* I - Open or close tag? */
{
  mxml_node_t	*parent;		/* Parent node */
  int		level;			/* Indentation level */
  const char	*name;			/* Name of element */
  static const char *tabs = "\t\t\t\t\t\t\t\t";
					/* Tabs for indentation */


 /*
  * We can conditionally break to a new line before or after any element.
  * These are just common HTML elements...
  */

  name = node->value.element.name;

  if (!strcmp(name, "html") || !strcmp(name, "head") || !strcmp(name, "body") ||
      !strcmp(name, "pre") || !strcmp(name, "p") ||
      !strcmp(name, "h1") || !strcmp(name, "h2") || !strcmp(name, "h3") ||
      !strcmp(name, "h4") || !strcmp(name, "h5") || !strcmp(name, "h6"))
  {
   /*
    * Newlines before open and after close...
    */

    if (where == MXML_WS_BEFORE_OPEN || where == MXML_WS_AFTER_CLOSE)
      return ("\n");
  }
  else if (!strcmp(name, "dl") || !strcmp(name, "ol") || !strcmp(name, "ul"))
  {
   /*
    * Put a newline before and after list elements...
    */

    return ("\n");
  }
  else if (!strcmp(name, "dd") || !strcmp(name, "dt") || !strcmp(name, "li"))
  {
   /*
    * Put a tab before <li>'s, <dd>'s, and <dt>'s, and a newline after them...
    */

    if (where == MXML_WS_BEFORE_OPEN)
      return ("\t");
    else if (where == MXML_WS_AFTER_CLOSE)
      return ("\n");
  }
  else if (!strncmp(name, "?xml", 4))
  {
    if (where == MXML_WS_AFTER_OPEN)
      return ("\n");
    else
      return (NULL);
  }
  else if (where == MXML_WS_BEFORE_OPEN ||
           ((!strcmp(name, "choice") || !strcmp(name, "option")) &&
	    where == MXML_WS_BEFORE_CLOSE))
  {
    for (level = -1, parent = node->parent;
         parent;
	 level ++, parent = parent->parent);

    if (level > 8)
      level = 8;
    else if (level < 0)
      level = 0;

    return (tabs + 8 - level);
  }
  else if (where == MXML_WS_AFTER_CLOSE ||
           ((!strcmp(name, "group") || !strcmp(name, "option") ||
	     !strcmp(name, "choice")) &&
            where == MXML_WS_AFTER_OPEN))
    return ("\n");
  else if (where == MXML_WS_AFTER_OPEN && !node->child)
    return ("\n");

 /*
  * Return NULL for no added whitespace...
  */

  return (NULL);
}