Fix Windows compile errors.

mxml-attr.c

@@ -115,11 +115,11 @@ mxmlElementGetAttr(mxml_node_t *node,	// I - Element node
 
 const char *                            // O - Attribute value
 mxmlElementGetAttrByIndex(
-    mxml_node_t *node,                  // I - Node
+    mxml_node_t *node,			// I - Node
-    int         idx,                    // I - Attribute index, starting at `0`
+    size_t      idx,			// I - Attribute index, starting at `0`
-    const char  **name)                 // O - Attribute name or `NULL` to not return it
+    const char  **name)			// O - Attribute name or `NULL` to not return it
 {
-  if (!node || node->type != MXML_TYPE_ELEMENT || idx < 0 || idx >= node->value.element.num_attrs)
+  if (!node || node->type != MXML_TYPE_ELEMENT || idx >= node->value.element.num_attrs)
     return (NULL);
 
   if (name)

mxml-file.c

@@ -211,10 +211,10 @@ mxmlLoadFilename(
 // for example:
 //
 // ```c
-// ssize_t my_io_cb(void *cbdata, void *buffer, size_t bytes)
+// size_t my_io_cb(void *cbdata, void *buffer, size_t bytes)
 // {
 //   ... copy up to "bytes" bytes into buffer ...
-//   ... return the number of bytes "read" or -1 on error ...
+//   ... return the number of bytes "read" or 0 on error ...
 // }
 // ```
 //
@@ -511,10 +511,10 @@ mxmlSaveFilename(
 // example:
 //
 // ```c
-// ssize_t my_io_cb(void *cbdata, const void *buffer, size_t bytes)
+// size_t my_io_cb(void *cbdata, const void *buffer, size_t bytes)
 // {
 //   ... write/copy bytes from buffer to the output ...
-//   ... return the number of bytes written/copied or -1 on error ...
+//   ... return the number of bytes written/copied or 0 on error ...
 // }
 // ```
 //
@@ -1858,12 +1858,16 @@ mxml_read_cb_fd(int    *fd,		// I - File descriptor
                 void   *buffer,		// I - Buffer
                 size_t bytes)		// I - Bytes to read
 {
-  ssize_t	rbytes;			// Bytes read
+#if _WIN32
+  int		rbytes;			// Bytes read
 
 
-#if _WIN32
+  rbytes = read(*fd, buffer, bytes);
-  rbytes = read(*fd, buffer, buffer);
+
 #else
+  ssize_t	rbytes;			// Bytes read
+
+
   while ((rbytes = read(*fd, buffer, bytes)) < 0)
   {
     if (errno != EINTR && errno != EAGAIN)
@@ -1917,7 +1921,7 @@ mxml_read_cb_string(
     sb->bufptr += bytes;
   }
 
-  return ((ssize_t)bytes);
+  return (bytes);
 }
 
 
@@ -2009,12 +2013,16 @@ mxml_io_cb_fd(int    *fd,		// I - File descriptor
                  void   *buffer,	// I - Buffer
                  size_t bytes)		// I - Bytes to write
 {
-  ssize_t	wbytes;			// Bytes written
+#if _WIN32
+  int		wbytes;			// Bytes written
 
 
-#if _WIN32
   wbytes = write(*fd, buffer, bytes);
+
 #else
+  ssize_t	wbytes;			// Bytes written
+
+
   while ((wbytes = write(*fd, buffer, bytes)) < 0)
   {
     if (errno != EINTR && errno != EAGAIN)
@@ -2159,7 +2167,7 @@ mxml_write_node(
 	    if (attr->value)
 	      width += strlen(attr->value) + 3;
 
-	    if (options && options->wrap > 0 && (col + width) > options->wrap)
+	    if (options && options->wrap > 0 && (col + (int)width) > options->wrap)
 	      col = mxml_write_string("\n", io_cb, io_cbdata, /*use_entities*/false, col);
 	    else
 	      col = mxml_write_string(" ", io_cb, io_cbdata, /*use_entities*/false, col);

mxml-node.c

@@ -846,7 +846,7 @@ mxmlRetain(mxml_node_t *node)		// I - Node
 static void
 mxml_free(mxml_node_t *node)		// I - Node
 {
-  int	i;				// Looping var
+  size_t	i;			// Looping var
 
 
   switch (node->type)

mxml.h

@@ -141,7 +141,7 @@ extern void		mxmlDelete(mxml_node_t *node);
 
 extern void		mxmlElementClearAttr(mxml_node_t *node, const char *name);
 extern const char	*mxmlElementGetAttr(mxml_node_t *node, const char *name);
-extern const char       *mxmlElementGetAttrByIndex(mxml_node_t *node, int idx, const char **name);
+extern const char       *mxmlElementGetAttrByIndex(mxml_node_t *node, size_t idx, const char **name);
 extern size_t		mxmlElementGetAttrCount(mxml_node_t *node);
 extern void		mxmlElementSetAttr(mxml_node_t *node, const char *name, const char *value);
 extern void		mxmlElementSetAttrf(mxml_node_t *node, const char *name, const char *format, ...) MXML_FORMAT(3,4);