ezxml.c

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    for(e = s + len; s != e; s++)
	{
	    while(*dlen + 10 > *max)
		*dst = realloc(*dst, *max += EZXML_BUFSIZE);

	    switch (*s)
		{
		case '\0':
		    return *dst;
		case '&':
		    *dlen += sprintf(*dst + *dlen, "&");
		    break;
		case '<':
		    *dlen += sprintf(*dst + *dlen, "&lt;");
		    break;
		case '>':
		    *dlen += sprintf(*dst + *dlen, "&gt;");
		    break;
		case '"':
		    *dlen += sprintf(*dst + *dlen, (a) ? "&quot;" : "\"");
		    break;
		case '\n':
		    *dlen += sprintf(*dst + *dlen, (a) ? "&#xA;" : "\n");
		    break;
		case '\t':
		    *dlen += sprintf(*dst + *dlen, (a) ? "&#x9;" : "\t");
		    break;
		case '\r':
		    *dlen += sprintf(*dst + *dlen, "&#xD;");
		    break;
		default:
		    (*dst)[(*dlen)++] = *s;
		}
	}
    return *dst;
}

/* Recursively converts each tag to xml appending it to *s. Reallocates *s if */
/* its length excedes max. start is the location of the previous tag in the */
/* parent tag's character content. Returns *s. */
char *
ezxml_toxml_r(ezxml_t xml,
	      char **s,
	      size_t * len,
	      size_t * max,
	      size_t start,
	      char ***attr)
{
    int i, j;
    char *txt = (xml->parent) ? xml->parent->txt : "";
    size_t off = 0;

    /* parent character content up to this tag */
    *s = ezxml_ampencode(txt + start, xml->off - start, s, len, max, 0);

    while(*len + strlen(xml->name) + 4 > *max)	/* reallocate s */
	*s = realloc(*s, *max += EZXML_BUFSIZE);

    *len += sprintf(*s + *len, "<%s", xml->name);	/* open tag */
    for(i = 0; xml->attr[i]; i += 2)
	{			/* tag attributes */
	    if(ezxml_attr(xml, xml->attr[i]) != xml->attr[i + 1])
		continue;
	    while(*len + strlen(xml->attr[i]) + 7 > *max)	/* reallocate s */
		*s = realloc(*s, *max += EZXML_BUFSIZE);

	    *len += sprintf(*s + *len, " %s=\"", xml->attr[i]);
	    /* Ted Campbell, Aug 14, 2007. Added explicit cast to size_t. */
	    ezxml_ampencode(xml->attr[i + 1], (size_t) (-1), s, len, max, 1);
	    *len += sprintf(*s + *len, "\"");
	}

    for(i = 0; attr[i] && strcmp(attr[i][0], xml->name); i++);
    for(j = 1; attr[i] && attr[i][j]; j += 3)
	{			/* default attributes */
	    if(!attr[i][j + 1]
	       || ezxml_attr(xml, attr[i][j]) != attr[i][j + 1])
		continue;	/* skip duplicates and non-values */
	    while(*len + strlen(attr[i][j]) + 7 > *max)	/* reallocate s */
		*s = realloc(*s, *max += EZXML_BUFSIZE);

	    *len += sprintf(*s + *len, " %s=\"", attr[i][j]);
	    /* Ted Campbell, Aug 14, 2007. Added explicit cast to size_t. */
	    ezxml_ampencode(attr[i][j + 1], (size_t) (-1), s, len, max, 1);
	    *len += sprintf(*s + *len, "\"");
	}
    *len += sprintf(*s + *len, ">");

    /* Ted Campbell, Aug 14, 2007. Added explicit cast to size_t. */
    *s = (xml->child) ? ezxml_toxml_r(xml->child, s, len, max, 0, attr)	/*child */
	: ezxml_ampencode(xml->txt, (size_t) (-1), s, len, max, 0);	/*data */

    while(*len + strlen(xml->name) + 4 > *max)	/* reallocate s */
	*s = realloc(*s, *max += EZXML_BUFSIZE);

    *len += sprintf(*s + *len, "</%s>", xml->name);	/* close tag */

    while(txt[off] && off < xml->off)
	off++;			/* make sure off is within bounds */
    /* Ted Campbell, Aug 14, 2007. Added explicit cast to size_t. */
    return (xml->ordered) ? ezxml_toxml_r(xml->ordered, s, len, max, off,
					  attr) : ezxml_ampencode(txt +
								  off,
								  (size_t)
								  (-1), s,
								  len, max,
								  0);
}

/* Converts an ezxml structure back to xml. Returns a string of xml data that */
/* must be freed. */
char *
ezxml_toxml(ezxml_t xml)
{
    ezxml_t p = (xml) ? xml->parent : NULL,
      o = (xml) ? xml->ordered : NULL;
    ezxml_root_t root = (ezxml_root_t) xml;
    size_t len = 0, max = EZXML_BUFSIZE;
    char *s = strcpy(malloc(max), ""),
     *t,
     *n;
    int i, j, k;

    if(!xml || !xml->name)
	return realloc(s, len + 1);
    while(root->xml.parent)
	root = (ezxml_root_t) root->xml.parent;	/* root tag */

    for(i = 0; !p && root->pi[i]; i++)
	{			/* pre-root processing instructions */
	    for(k = 2; root->pi[i][k - 1]; k++);
	    for(j = 1; root->pi[i][j]; j++)
		{
		    /* Jason Luu, Aug 29, 2007. Removed assignment in conditional statement */
		    n = root->pi[i][j];
		    if(root->pi[i][k][j - 1] == '>')
			continue;	/* not pre-root */
		    while(len + strlen(t = root->pi[i][0]) + strlen(n) + 7 >
			  max)
			s = realloc(s, max += EZXML_BUFSIZE);
		    len +=
			sprintf(s + len, "<?%s%s%s?>\n", t, *n ? " " : "", n);
		}
	}

    xml->parent = xml->ordered = NULL;
    s = ezxml_toxml_r(xml, &s, &len, &max, 0, root->attr);
    xml->parent = p;
    xml->ordered = o;

    for(i = 0; !p && root->pi[i]; i++)
	{			/* post-root processing instructions */
	    for(k = 2; root->pi[i][k - 1]; k++);
	    for(j = 1; root->pi[i][j]; j++)
		{
		    /* Jason Luu, Aug 29, 2007. Removed assignment in conditional statement */
		    n = root->pi[i][j];
		    if(root->pi[i][k][j - 1] == '<')
			continue;	/* not post-root */
		    while(len + strlen(t = root->pi[i][0]) + strlen(n) + 7 >
			  max)
			s = realloc(s, max += EZXML_BUFSIZE);
		    len +=
			sprintf(s + len, "\n<?%s%s%s?>", t, *n ? " " : "", n);
		}
	}
    return realloc(s, len + 1);
}

/* free the memory allocated for the ezxml structure */
void
ezxml_free(ezxml_t xml)
{
    ezxml_root_t root = (ezxml_root_t) xml;
    int i, j;
    char **a, *s;

    if(!xml)
	return;
    ezxml_free(xml->child);
    ezxml_free(xml->ordered);

    if(!xml->parent)
	{			/* free root tag allocations */
	    for(i = 10; root->ent[i]; i += 2)	/* 0 - 9 are default entites (<>&"') */
		if((s = root->ent[i + 1]) < root->s || s > root->e)
		    free(s);
	    free(root->ent);	/* free list of general entities */

	    for(i = 0; root->attr[i]; i++)
		{
		    /* Jason Luu, Aug 29, 2007. Removed assignment in conditional statement */
		    a = root->attr[i];
		    for(j = 1; a[j++]; j += 2)	/* free malloced attribute values */
			if(a[j] && (a[j] < root->s || a[j] > root->e))
			    free(a[j]);
		    free(a);
		}
	    if(root->attr[0])
		free(root->attr);	/* free default attribute list */

	    for(i = 0; root->pi[i]; i++)
		{
		    for(j = 1; root->pi[i][j]; j++);
		    free(root->pi[i][j + 1]);
		    free(root->pi[i]);
		}
	    if(root->pi[0])
		free(root->pi);	/* free processing instructions */

	    if(root->len == -1)
		free(root->m);	/* malloced xml data */
#ifndef EZXML_NOMMAP
	    else if(root->len)
		munmap(root->m, root->len);	/* mem mapped xml data */
#endif /* EZXML_NOMMAP */
	    if(root->u)
		free(root->u);	/* utf8 conversion */
	}

    ezxml_free_attr(xml->attr);	/* tag attributes */
    if((xml->flags & EZXML_TXTM))
	free(xml->txt);		/* character content */
    if((xml->flags & EZXML_NAMEM))
	free(xml->name);	/* tag name */
    free(xml);
}

/* return parser error message or empty string if none */
const char *
ezxml_error(ezxml_t xml)
{
    while(xml && xml->parent)
	xml = xml->parent;	/* find root tag */
    return (xml) ? ((ezxml_root_t) xml)->err : "";
}

/* returns a new empty ezxml structure with the given root tag name */
ezxml_t
ezxml_new(const char *name)
{
    static char *ent[] = { "lt;", "&#60;", "gt;", "&#62;", "quot;", "&#34;",
	"apos;", "&#39;", "amp;", "&#38;", NULL
    };
    ezxml_root_t root =
	(ezxml_root_t) memset(malloc(sizeof(struct ezxml_root)),
			      '\0', sizeof(struct ezxml_root));

    root->xml.name = (char *)name;
    root->cur = &root->xml;
    strcpy(root->err, root->xml.txt = "");
    root->ent = memcpy(malloc(sizeof(ent)), ent, sizeof(ent));
    root->attr = root->pi = (char ***)(root->xml.attr = EZXML_NIL);
    return &root->xml;
}

/* inserts an existing tag into an ezxml structure */
ezxml_t
ezxml_insert(ezxml_t xml,
	     ezxml_t dest,
	     size_t off)
{
    ezxml_t cur, prev, head;

    xml->next = xml->sibling = xml->ordered = NULL;
    xml->off = off;
    xml->parent = dest;

    /* Jason Luu, Aug 29, 2007. Removed assignment in conditional statement */
    head = dest->child;
    if(head)
	{			/* already have sub tags */
	    if(head->off <= off)
		{		/* not first subtag */
		    for(cur = head; cur->ordered && cur->ordered->off <= off;
			cur = cur->ordered);
		    xml->ordered = cur->ordered;
		    cur->ordered = xml;
		}
	    else
		{		/* first subtag */
		    xml->ordered = head;
		    dest->child = xml;
		}

	    for(cur = head, prev = NULL; cur && strcmp(cur->name, xml->name); prev = cur, cur = cur->sibling);	/* find tag type */
	    if(cur && cur->off <= off)
		{		/* not first of type */
		    while(cur->next && cur->next->off <= off)
			cur = cur->next;
		    xml->next = cur->next;
		    cur->next = xml;
		}
	    else
		{		/* first tag of this type */
		    if(prev && cur)
			prev->sibling = cur->sibling;	/* remove old first */
		    xml->next = cur;	/* old first tag is now next */
		    for(cur = head, prev = NULL; cur && cur->off <= off; prev = cur, cur = cur->sibling);	/* new sibling insert point */
		    xml->sibling = cur;
		    if(prev)
			prev->sibling = xml;
		}
	}
    else
	dest->child = xml;	/* only sub tag */

    return xml;
}

/* Adds a child tag. off is the offset of the child tag relative to the start */
/* of the parent tag's character content. Returns the child tag. */
ezxml_t
ezxml_add_child(ezxml_t xml,
		const char *name,
		size_t off)
{
    ezxml_t child;

    if(!xml)
	return NULL;
    child = (ezxml_t) memset(malloc(sizeof(struct ezxml)), '\0',
			     sizeof(struct ezxml));
    child->name = (char *)name;
    child->attr = EZXML_NIL;
    child->txt = "";

    return ezxml_insert(child, xml, off);
}

/* sets the character content for the given tag and returns the tag */
ezxml_t
ezxml_set_txt(ezxml_t xml,
	      const char *txt)
{
    if(!xml)
	return NULL;
    if(xml->flags & EZXML_TXTM)
	free(xml->txt);		/* existing txt was malloced */
    xml->flags &= ~EZXML_TXTM;
    xml->txt = (char *)txt;
    return xml;
}

/* Sets the given tag attribute or adds a new attribute if not found. A value */
/* of NULL will remove the specified attribute. Returns the tag given. */
ezxml_t
ezxml_set_attr(ezxml_t xml,
	       const char *name,
	       const char *value)
{
    int l = 0, c;

    if(!xml)
	return NULL;
    while(xml->attr[l] && strcmp(xml->attr[l], name))
	l += 2;
    if(!xml->attr[l])
	{			/* not found, add as new attribute */
	    if(!value)
		return xml;	/* nothing to do */
	    if(xml->attr == EZXML_NIL)
		{		/* first attribute */
		    xml->attr = malloc(4 * sizeof(char *));
		    /* Ted Campbell, Aug 14, 2007. Changed to use 'my_strdup' */
		    xml->attr[1] = my_strdup("");	/* empty list of malloced names/vals */
		}
	    else
		xml->attr = realloc(xml->attr, (l + 4) * sizeof(char *));

	    xml->attr[l] = (char *)name;	/* set attribute name */
	    xml->attr[l + 2] = NULL;	/* null terminate attribute list */
	    xml->attr[l + 3] = realloc(xml->attr[l + 1],
				       (c = strlen(xml->attr[l + 1])) + 2);
	    strcpy(xml->attr[l + 3] + c, " ");	/* set name/value as not malloced */
	    if(xml->flags & EZXML_DUP)
		xml->attr[l + 3][c] = (char)(unsigned char)EZXML_NAMEM;
	}
    else if(xml->flags & EZXML_DUP)
	free((char *)name);	/* name was strduped */

    for(c = l; xml->attr[c]; c += 2);	/* find end of attribute list */
    if(xml->attr[c + 1][l / 2] & EZXML_TXTM)
	free(xml->attr[l + 1]);	/*old val */
    if(xml->flags & EZXML_DUP)
	xml->attr[c + 1][l / 2] |= EZXML_TXTM;
    else
	xml->attr[c + 1][l / 2] &= ~EZXML_TXTM;

    if(value)
	xml->attr[l + 1] = (char *)value;	/* set attribute value */
    else
	{			/* remove attribute */
	    if(xml->attr[c + 1][l / 2] & EZXML_NAMEM)
		free(xml->attr[l]);
	    /* Ted Campbell, Aug 14, 2007. It seems that the size should be 
	     * (c + 2) - (l + 2) = (c - l) */
	    memmove(xml->attr + l, xml->attr + l + 2,
		    (c - l) * sizeof(char *));
	    /* Ted Campbell, Aug 14, 2007. We need to adjust c to point to new
	     * location it was moved to since its old location is undefined */
	    c -= 2;		/* We have one less elements */
	    xml->attr = realloc(xml->attr, (c + 2) * sizeof(char *));
	    memmove(xml->attr[c + 1] + (l / 2), xml->attr[c + 1] + (l / 2) + 1, (c / 2) - (l / 2));	/* fix list of which name/vals are malloced */
	}
    xml->flags &= ~EZXML_DUP;	/* clear strdup() flag */
    return xml;
}

/* sets a flag for the given tag and returns the tag */
ezxml_t
ezxml_set_flag(ezxml_t xml,
	       short flag)
{
    if(xml)
	xml->flags |= flag;
    return xml;
}

/* removes a tag along with its subtags without freeing its memory */
ezxml_t
ezxml_cut(ezxml_t xml)
{
    ezxml_t cur;

    if(!xml)
	return NULL;		/* nothing to do */
    if(xml->next)
	xml->next->sibling = xml->sibling;	/* patch sibling list */

    if(xml->parent)
	{			/* not root tag */
	    cur = xml->parent->child;	/* find head of subtag list */
	    if(cur == xml)
		xml->parent->child = xml->ordered;	/* first subtag */
	    else
		{		/* not first subtag */
		    while(cur->ordered != xml)
			cur = cur->ordered;
		    cur->ordered = cur->ordered->ordered;	/* patch ordered list */

		    cur = xml->parent->child;	/* go back to head of subtag list */
		    if(strcmp(cur->name, xml->name))
			{	/* not in first sibling list */
			    while(strcmp(cur->sibling->name, xml->name))
				cur = cur->sibling;
			    if(cur->sibling == xml)
				{	/* first of a sibling list */
				    cur->sibling = (xml->next) ? xml->next
					: cur->sibling->sibling;
				}
			    else
				cur = cur->sibling;	/* not first of a sibling list */
			}

		    while(cur->next && cur->next != xml)
			cur = cur->next;
		    if(cur->next)
			cur->next = cur->next->next;	/* patch next list */
		}
	}
    xml->ordered = xml->sibling = xml->next = NULL;
    return xml;
}

#ifdef EZXML_TEST		/* test harness */
int
main(int argc,
     char **argv)
{
    ezxml_t xml;
    char *s;
    int i;

    if(argc != 2)
	return fprintf(stderr, "usage: %s xmlfile\n", argv[0]);

    xml = ezxml_parse_file(argv[1]);
    printf("%s\n", (s = ezxml_toxml(xml)));
    free(s);
    i = fprintf(stderr, "%s", ezxml_error(xml));
    ezxml_free(xml);
    return (i) ? 1 : 0;
}
#endif /* EZXML_TEST */