Documentation

# Library Reference

## Contents

- Functions
  - mxmlAdd
  - mxmlDelete
  - mxmlElementDeleteAttr
  - mxmlElementGetAttr
  - mxmlElementSetAttr
  - mxmlElementSetAttrf
  - mxmlEntityAddCallback
  - mxmlEntityGetName
  - mxmlEntityGetValue
  - mxmlEntityRemoveCallback
  - mxmlFindElement
  - mxmlFindPath
  - mxmlGetCDATA
  - mxmlGetCustom
  - mxmlGetElement
  - mxmlGetFirstChild
  - mxmlGetInteger
  - mxmlGetLastChild
  - mxmlGetNextSibling
  - mxmlGetOpaque
  - mxmlGetParent
  - mxmlGetPrevSibling
  - mxmlGetReal
  - mxmlGetRefCount
  - mxmlGetText
  - mxmlGetType
  - mxmlGetUserData
  - mxmlIndexDelete
  - mxmlIndexEnum
  - mxmlIndexFind
  - mxmlIndexGetCount
  - mxmlIndexNew
  - mxmlIndexReset
  - mxmlLoadFd
  - mxmlLoadFile
  - mxmlLoadString
  - mxmlNewCDATA
  - mxmlNewCustom
  - mxmlNewElement
  - mxmlNewInteger
  - mxmlNewOpaque
  - mxmlNewReal
  - mxmlNewText
  - mxmlNewTextf
  - mxmlNewXML
  - mxmlRelease
  - mxmlRemove
  - mxmlRetain
  - mxmlSAXLoadFd
  - mxmlSAXLoadFile
  - mxmlSAXLoadString
  - mxmlSaveAllocString
  - mxmlSaveFd
  - mxmlSaveFile
  - mxmlSaveString
  - mxmlSetCDATA
  - mxmlSetCustom
  - mxmlSetCustomHandlers
  - mxmlSetElement
  - mxmlSetErrorCallback
  - mxmlSetInteger
  - mxmlSetOpaque
  - mxmlSetReal
  - mxmlSetText
  - mxmlSetTextf
  - mxmlSetUserData
  - mxmlSetWrapMargin
  - mxmlWalkNext
  - mxmlWalkPrev
- Data Types
  - mxml_custom_destroy_cb_t
  - mxml_custom_load_cb_t
  - mxml_custom_save_cb_t
  - mxml_entity_cb_t
  - mxml_error_cb_t
  - mxml_index_t
  - mxml_load_cb_t
  - mxml_node_t
  - mxml_save_cb_t
  - mxml_sax_cb_t
  - mxml_sax_event_t
  - mxml_type_t
- Constants
  - mxml_sax_event_e
  - mxml_type_e

## Functions

### mxmlAdd

Add a node to a tree.

void mxmlAdd (
mxml_node_t *parent,
int where,
mxml_node_t *child,
mxml_node_t *node
);

#### Parameters

parent
  Parent node
where
  Where to add, MXML_ADD_BEFORE or MXML_ADD_AFTER
child
  Child node for where or MXML_ADD_TO_PARENT
node
  Node to add

#### Discussion

Adds the specified node to the parent. If the child argument is not NULL, puts the new node before or after the specified child depending on the value of the where argument. If the child argument is NULL, puts the new node at the beginning of the child list (MXML_ADD_BEFORE) or at the end of the child list (MXML_ADD_AFTER). The constant MXML_ADD_TO_PARENT can be used to specify a NULL child pointer.

### mxmlDelete

Delete a node and all of its children.

void mxmlDelete (
mxml_node_t *node
);

#### Parameters

node
  Node to delete

#### Discussion

If the specified node has a parent, this function first removes the node from its parent using the mxmlRemove() function.

### Mini-XML 2.4 mxmlElementDeleteAttr

Delete an attribute.

void mxmlElementDeleteAttr (
mxml_node_t *node,
const char *name
);

#### Parameters

node
  Element
name
  Attribute name

### mxmlElementGetAttr

Get an attribute.

const char *mxmlElementGetAttr (
mxml_node_t *node,
const char *name
);

#### Parameters

node
  Element node
name
  Name of attribute

#### Return Value

Attribute value or NULL

#### Discussion

This function returns NULL if the node is not an element or the named attribute does not exist.

### mxmlElementSetAttr

Set an attribute.

void mxmlElementSetAttr (
mxml_node_t *node,
const char *name,
const char *value
);

#### Parameters

node
  Element node
name
  Name of attribute
value
  Attribute value

#### Discussion

If the named attribute already exists, the value of the attribute is replaced by the new string value. The string value is copied into the element node. This function does nothing if the node is not an element.

### Mini-XML 2.3 mxmlElementSetAttrf

Set an attribute with a formatted value.

void mxmlElementSetAttrf (
mxml_node_t *node,
const char *name,
const char *format,
...
);

#### Parameters

node
  Element node
name
  Name of attribute
format
  Printf-style attribute value
...
  Additional arguments as needed

#### Discussion

If the named attribute already exists, the value of the attribute is replaced by the new formatted string. The formatted string value is copied into the element node. This function does nothing if the node is not an element.

### mxmlEntityAddCallback

Add a callback to convert entities to Unicode.

int mxmlEntityAddCallback (
mxml_entity_cb_t cb
);

#### Parameters

cb
  Callback function to add

#### Return Value

0 on success, -1 on failure

### mxmlEntityGetName

Get the name that corresponds to the character value.

const char *mxmlEntityGetName (
int val
);

#### Parameters

val
  Character value

#### Return Value

Entity name or NULL

#### Discussion

If val does not need to be represented by a named entity, NULL is returned.

### mxmlEntityGetValue

Get the character corresponding to a named entity.

int mxmlEntityGetValue (
const char *name
);

#### Parameters

name
  Entity name

#### Return Value

Character value or -1 on error

#### Discussion

The entity name can also be a numeric constant. -1 is returned if the name is not known.

### mxmlEntityRemoveCallback

Remove a callback.

void mxmlEntityRemoveCallback (
mxml_entity_cb_t cb
);

#### Parameters

cb
  Callback function to remove

### mxmlFindElement

Find the named element.

mxml_node_t *mxmlFindElement (
mxml_node_t *node,
mxml_node_t *top,
const char *name,
const char *attr,
const char *value,
int descend
);

#### Parameters

node
  Current node
top
  Top node
name
  Element name or NULL for any
attr
  Attribute name, or NULL for none
value
  Attribute value, or NULL for any
descend
  Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST

#### Return Value

Element node or NULL

#### Discussion

The search is constrained by the name, attribute name, and value; any NULL names or values are treated as wildcards, so different kinds of searches can be implemented by looking for all elements of a given name or all elements with a specific attribute. The descend argument determines whether the search descends into child nodes; normally you will use MXML_DESCEND_FIRST for the initial search and MXML_NO_DESCEND to find additional direct descendents of the node. The top node argument constrains the search to a particular node's children.

### Mini-XML 2.7 mxmlFindPath

Find a node with the given path.

mxml_node_t *mxmlFindPath (
mxml_node_t *top,
const char *path
);

#### Parameters

top
  Top node
path
  Path to element

#### Return Value

Found node or NULL

#### Discussion

The "path" is a slash-separated list of element names. The name "*" is considered a wildcard for one or more levels of elements. For example, "foo/one/two", "bar/two/one", "*/one", and so forth.
The first child node of the found node is returned if the given node has children and the first child is a value node.

### Mini-XML 2.7 mxmlGetCDATA

Get the value for a CDATA node.

const char *mxmlGetCDATA (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

CDATA value or NULL

#### Discussion

`NULL` is returned if the node is not a CDATA element.

### Mini-XML 2.7 mxmlGetCustom

Get the value for a custom node.

const void *mxmlGetCustom (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Custom value or NULL

#### Discussion

`NULL` is returned if the node (or its first child) is not a custom value node.

### Mini-XML 2.7 mxmlGetElement

Get the name for an element node.

const char *mxmlGetElement (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Element name or NULL

#### Discussion

`NULL` is returned if the node is not an element node.

### Mini-XML 2.7 mxmlGetFirstChild

Get the first child of an element node.

mxml_node_t *mxmlGetFirstChild (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

First child or NULL

#### Discussion

`NULL` is returned if the node is not an element node or if the node has no children.

### Mini-XML 2.7 mxmlGetInteger

Get the integer value from the specified node or its first child.

int mxmlGetInteger (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Integer value or 0

#### Discussion

0 is returned if the node (or its first child) is not an integer value node.

### Mini-XML 2.7 mxmlGetLastChild

Get the last child of an element node.

mxml_node_t *mxmlGetLastChild (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Last child or NULL

#### Discussion

`NULL` is returned if the node is not an element node or if the node has no children.

### mxmlGetNextSibling

Return the node type...

mxml_node_t *mxmlGetNextSibling (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Get the next node for the current parent.

`NULL` is returned if this is the last child for the current parent.

### Mini-XML 2.7 mxmlGetOpaque

Get an opaque string value for a node or its first child.

const char *mxmlGetOpaque (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Opaque string or NULL

#### Discussion

`NULL` is returned if the node (or its first child) is not an opaque value node.

### Mini-XML 2.7 mxmlGetParent

Get the parent node.

mxml_node_t *mxmlGetParent (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Parent node or NULL

#### Discussion

`NULL` is returned for a root node.

### Mini-XML 2.7 mxmlGetPrevSibling

Get the previous node for the current parent.

mxml_node_t *mxmlGetPrevSibling (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Previous node or NULL

#### Discussion

`NULL` is returned if this is the first child for the current parent.

### Mini-XML 2.7 mxmlGetReal

Get the real value for a node or its first child.

double mxmlGetReal (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Real value or 0.0

#### Discussion

0.0 is returned if the node (or its first child) is not a real value node.

### Mini-XML 2.7 mxmlGetRefCount

Get the current reference (use) count for a node.

int mxmlGetRefCount (
mxml_node_t *node
);

#### Parameters

node
  Node

#### Return Value

Reference count

#### Discussion

The initial reference count of new nodes is 1. Use the `mxmlRetain` and `mxmlRelease` functions to increment and decrement a node's reference count. .

### Mini-XML 2.7 mxmlGetText

Get the text value for a node or its first child.

const char *mxmlGetText (
mxml_node_t *node,
int *whitespace
);

#### Parameters

node
  Node to get
whitespace
  1 if string is preceded by whitespace, 0 otherwise

#### Return Value

Text string or NULL

#### Discussion

`NULL` is returned if the node (or its first child) is not a text node. The "whitespace" argument can be NULL.

### Mini-XML 2.7 mxmlGetType

Get the node type.

mxml_type_t mxmlGetType (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

Type of node

#### Discussion

`MXML_IGNORE` is returned if "node" is `NULL`.

### Mini-XML 2.7 mxmlGetUserData

Get the user data pointer for a node.

void *mxmlGetUserData (
mxml_node_t *node
);

#### Parameters

node
  Node to get

#### Return Value

User data pointer

### mxmlIndexDelete

Delete an index.

void mxmlIndexDelete (
mxml_index_t *ind
);

#### Parameters

ind
  Index to delete

### mxmlIndexEnum

Return the next node in the index.

mxml_node_t *mxmlIndexEnum (
mxml_index_t *ind
);

#### Parameters

ind
  Index to enumerate

#### Return Value

Next node or NULL if there is none

#### Discussion

Nodes are returned in the sorted order of the index.

### mxmlIndexFind

Find the next matching node.

mxml_node_t *mxmlIndexFind (
mxml_index_t *ind,
const char *element,
const char *value
);

#### Parameters

ind
  Index to search
element
  Element name to find, if any
value
  Attribute value, if any

#### Return Value

Node or NULL if none found

#### Discussion

You should call mxmlIndexReset() prior to using this function for the first time with a particular set of "element" and "value" strings. Passing NULL for both "element" and "value" is equivalent to calling mxmlIndexEnum().

### Mini-XML 2.7 mxmlIndexGetCount

Get the number of nodes in an index.

int mxmlIndexGetCount (
mxml_index_t *ind
);

#### Parameters

ind
  Index of nodes

#### Return Value

Number of nodes in index

### mxmlIndexNew

Create a new index.

mxml_index_t *mxmlIndexNew (
mxml_node_t *node,
const char *element,
const char *attr
);

#### Parameters

node
  XML node tree
element
  Element to index or NULL for all
attr
  Attribute to index or NULL for none

#### Return Value

New index

#### Discussion

The index will contain all nodes that contain the named element and/or attribute. If both "element" and "attr" are NULL, then the index will contain a sorted list of the elements in the node tree. Nodes are sorted by element name and optionally by attribute value if the "attr" argument is not NULL.

### mxmlIndexReset

Reset the enumeration/find pointer in the index and return the first node in the index.

mxml_node_t *mxmlIndexReset (
mxml_index_t *ind
);

#### Parameters

ind
  Index to reset

#### Return Value

First node or NULL if there is none

#### Discussion

This function should be called prior to using mxmlIndexEnum() or mxmlIndexFind() for the first time.

### mxmlLoadFd

Load a file descriptor into an XML node tree.

mxml_node_t *mxmlLoadFd (
mxml_node_t *top,
int fd,
mxml_load_cb_t cb
);

#### Parameters

top
  Top node
fd
  File descriptor to read from
cb
  Callback function or MXML_NO_CALLBACK

#### Return Value

First node or NULL if the file could not be read.

#### Discussion

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. If MXML_NO_CALLBACK is specified then all child nodes will be either MXML_ELEMENT or MXML_TEXT nodes.
The constants MXML_INTEGER_CALLBACK, MXML_OPAQUE_CALLBACK, MXML_REAL_CALLBACK, and MXML_TEXT_CALLBACK are defined for loading child nodes of the specified type.

### mxmlLoadFile

Load a file into an XML node tree.

mxml_node_t *mxmlLoadFile (
mxml_node_t *top,
FILE *fp,
mxml_load_cb_t cb
);

#### Parameters

top
  Top node
fp
  File to read from
cb
  Callback function or MXML_NO_CALLBACK

#### Return Value

First node or NULL if the file could not be read.

#### Discussion

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. If MXML_NO_CALLBACK is specified then all child nodes will be either MXML_ELEMENT or MXML_TEXT nodes.
The constants MXML_INTEGER_CALLBACK, MXML_OPAQUE_CALLBACK, MXML_REAL_CALLBACK, and MXML_TEXT_CALLBACK are defined for loading child nodes of the specified type.

### mxmlLoadString

Load a string into an XML node tree.

mxml_node_t *mxmlLoadString (
mxml_node_t *top,
const char *s,
mxml_load_cb_t cb
);

#### Parameters

top
  Top node
s
  String to load
cb
  Callback function or MXML_NO_CALLBACK

#### Return Value

First node or NULL if the string has errors.

#### Discussion

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. If MXML_NO_CALLBACK is specified then all child nodes will be either MXML_ELEMENT or MXML_TEXT nodes.
The constants MXML_INTEGER_CALLBACK, MXML_OPAQUE_CALLBACK, MXML_REAL_CALLBACK, and MXML_TEXT_CALLBACK are defined for loading child nodes of the specified type.

### Mini-XML 2.3 mxmlNewCDATA

Create a new CDATA node.

mxml_node_t *mxmlNewCDATA (
mxml_node_t *parent,
const char *data
);

#### Parameters

parent
  Parent node or MXML_NO_PARENT
data
  Data string

#### Return Value

New node

#### Discussion

The new CDATA node is added to the end of the specified parent's child list. The constant MXML_NO_PARENT can be used to specify that the new CDATA node has no parent. The data string must be nul-terminated and is copied into the new node. CDATA nodes use the MXML_ELEMENT type.

### Mini-XML 2.1 mxmlNewCustom

Create a new custom data node.

mxml_node_t *mxmlNewCustom (
mxml_node_t *parent,
void *data,
mxml_custom_destroy_cb_t destroy
);

#### Parameters

parent
  Parent node or MXML_NO_PARENT
data
  Pointer to data
destroy
  Function to destroy data

#### Return Value

New node

#### Discussion

The new custom node is added to the end of the specified parent's child list. The constant MXML_NO_PARENT can be used to specify that the new element node has no parent. NULL can be passed when the data in the node is not dynamically allocated or is separately managed.

### mxmlNewElement

Create a new element node.

mxml_node_t *mxmlNewElement (
mxml_node_t *parent,
const char *name
);

#### Parameters

parent
  Parent node or MXML_NO_PARENT
name
  Name of element

#### Return Value

New node

#### Discussion

The new element node is added to the end of the specified parent's child list. The constant MXML_NO_PARENT can be used to specify that the new element node has no parent.

### mxmlNewInteger

Create a new integer node.

mxml_node_t *mxmlNewInteger (
mxml_node_t *parent,
int integer
);

#### Parameters

parent
  Parent node or MXML_NO_PARENT
integer
  Integer value

#### Return Value

New node

#### Discussion

The new integer node is added to the end of the specified parent's child list. The constant MXML_NO_PARENT can be used to specify that the new integer node has no parent.

### mxmlNewOpaque

Create a new opaque string.

mxml_node_t *mxmlNewOpaque (
mxml_node_t *parent,
const char *opaque
);

#### Parameters

parent
  Parent node or MXML_NO_PARENT
opaque
  Opaque string

#### Return Value

New node

#### Discussion

The new opaque node is added to the end of the specified parent's child list. The constant MXML_NO_PARENT can be used to specify that the new opaque node has no parent. The opaque string must be nul-terminated and is copied into the new node.

### mxmlNewReal

Create a new real number node.

mxml_node_t *mxmlNewReal (
mxml_node_t *parent,
double real
);

#### Parameters

parent
  Parent node or MXML_NO_PARENT
real
  Real number value

#### Return Value

New node

#### Discussion

The new real number node is added to the end of the specified parent's child list. The constant MXML_NO_PARENT can be used to specify that the new real number node has no parent.

### mxmlNewText

Create a new text fragment node.

mxml_node_t *mxmlNewText (
mxml_node_t *parent,
int whitespace,
const char *string
);

#### Parameters

parent
  Parent node or MXML_NO_PARENT
whitespace
  1 = leading whitespace, 0 = no whitespace
string
  String

#### Return Value

New node

#### Discussion

The new text node is added to the end of the specified parent's child list. The constant MXML_NO_PARENT can be used to specify that the new text node has no parent. The whitespace parameter is used to specify whether leading whitespace is present before the node. The text string must be nul-terminated and is copied into the new node.

### mxmlNewTextf

Create a new formatted text fragment node.

mxml_node_t *mxmlNewTextf (
mxml_node_t *parent,
int whitespace,
const char *format,
...
);

#### Parameters

parent
  Parent node or MXML_NO_PARENT
whitespace
  1 = leading whitespace, 0 = no whitespace
format
  Printf-style frmat string
...
  Additional args as needed

#### Return Value

New node

#### Discussion

The new text node is added to the end of the specified parent's child list. The constant MXML_NO_PARENT can be used to specify that the new text node has no parent. The whitespace parameter is used to specify whether leading whitespace is present before the node. The format string must be nul-terminated and is formatted into the new node.

### Mini-XML 2.3 mxmlNewXML

Create a new XML document tree.

mxml_node_t *mxmlNewXML (
const char *version
);

#### Parameters

version
  Version number to use

#### Return Value

New ?xml node

#### Discussion

The "version" argument specifies the version number to put in the ?xml element node. If NULL, version 1.0 is assumed.

### Mini-XML 2.3 mxmlRelease

Release a node.

int mxmlRelease (
mxml_node_t *node
);

#### Parameters

node
  Node

#### Return Value

New reference count

#### Discussion

When the reference count reaches zero, the node (and any children) is deleted via mxmlDelete().

### mxmlRemove

Remove a node from its parent.

void mxmlRemove (
mxml_node_t *node
);

#### Parameters

node
  Node to remove

#### Discussion

Does not free memory used by the node - use mxmlDelete() for that. This function does nothing if the node has no parent.

### Mini-XML 2.3 mxmlRetain

Retain a node.

int mxmlRetain (
mxml_node_t *node
);

#### Parameters

node
  Node

#### Return Value

New reference count

### Mini-XML 2.3 mxmlSAXLoadFd

Load a file descriptor into an XML node tree using a SAX callback.

mxml_node_t *mxmlSAXLoadFd (
mxml_node_t *top,
int fd,
mxml_load_cb_t cb,
mxml_sax_cb_t sax_cb,
void *sax_data
);

#### Parameters

top
  Top node
fd
  File descriptor to read from
cb
  Callback function or MXML_NO_CALLBACK
sax_cb
  SAX callback or MXML_NO_CALLBACK
sax_data
  SAX user data

#### Return Value

First node or NULL if the file could not be read.

#### Discussion

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. If MXML_NO_CALLBACK is specified then all child nodes will be either MXML_ELEMENT or MXML_TEXT nodes.
The constants MXML_INTEGER_CALLBACK, MXML_OPAQUE_CALLBACK, MXML_REAL_CALLBACK, and MXML_TEXT_CALLBACK are defined for loading child nodes of the specified type.
The SAX callback must call 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.

### Mini-XML 2.3 mxmlSAXLoadFile

Load a file into an XML node tree using a SAX callback.

mxml_node_t *mxmlSAXLoadFile (
mxml_node_t *top,
FILE *fp,
mxml_load_cb_t cb,
mxml_sax_cb_t sax_cb,
void *sax_data
);

#### Parameters

top
  Top node
fp
  File to read from
cb
  Callback function or MXML_NO_CALLBACK
sax_cb
  SAX callback or MXML_NO_CALLBACK
sax_data
  SAX user data

#### Return Value

First node or NULL if the file could not be read.

#### Discussion

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. If MXML_NO_CALLBACK is specified then all child nodes will be either MXML_ELEMENT or MXML_TEXT nodes.
The constants MXML_INTEGER_CALLBACK, MXML_OPAQUE_CALLBACK, MXML_REAL_CALLBACK, and MXML_TEXT_CALLBACK are defined for loading child nodes of the specified type.
The SAX callback must call 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.

### Mini-XML 2.3 mxmlSAXLoadString

Load a string into an XML node tree using a SAX callback.

mxml_node_t *mxmlSAXLoadString (
mxml_node_t *top,
const char *s,
mxml_load_cb_t cb,
mxml_sax_cb_t sax_cb,
void *sax_data
);

#### Parameters

top
  Top node
s
  String to load
cb
  Callback function or MXML_NO_CALLBACK
sax_cb
  SAX callback or MXML_NO_CALLBACK
sax_data
  SAX user data

#### Return Value

First node or NULL if the string has errors.

#### Discussion

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. If MXML_NO_CALLBACK is specified then all child nodes will be either MXML_ELEMENT or MXML_TEXT nodes.
The constants MXML_INTEGER_CALLBACK, MXML_OPAQUE_CALLBACK, MXML_REAL_CALLBACK, and MXML_TEXT_CALLBACK are defined for loading child nodes of the specified type.
The SAX callback must call 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.

### mxmlSaveAllocString

Save an XML tree to an allocated string.

char *mxmlSaveAllocString (
mxml_node_t *node,
mxml_save_cb_t cb
);

#### Parameters

node
  Node to write
cb
  Whitespace callback or MXML_NO_CALLBACK

#### Return Value

Allocated string or NULL

#### Discussion

This function returns a pointer to a string containing the textual representation of the XML node tree. The string should be freed using the free() function 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_TEXT nodes with leading whitespace and before attribute names inside opening element tags.

### mxmlSaveFd

Save an XML tree to a file descriptor.

int mxmlSaveFd (
mxml_node_t *node,
int fd,
mxml_save_cb_t cb
);

#### Parameters

node
  Node to write
fd
  File descriptor to write to
cb
  Whitespace callback or MXML_NO_CALLBACK

#### Return Value

0 on success, -1 on error.

#### Discussion

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_TEXT nodes with leading whitespace and before attribute names inside opening element tags.

### mxmlSaveFile

Save an XML tree to a file.

int mxmlSaveFile (
mxml_node_t *node,
FILE *fp,
mxml_save_cb_t cb
);

#### Parameters

node
  Node to write
fp
  File to write to
cb
  Whitespace callback or MXML_NO_CALLBACK

#### Return Value

0 on success, -1 on error.

#### Discussion

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_TEXT nodes with leading whitespace and before attribute names inside opening element tags.

### mxmlSaveString

Save an XML node tree to a string.

int mxmlSaveString (
mxml_node_t *node,
char *buffer,
int bufsize,
mxml_save_cb_t cb
);

#### Parameters

node
  Node to write
buffer
  String buffer
bufsize
  Size of string buffer
cb
  Whitespace callback or MXML_NO_CALLBACK

#### Return Value

Size of string

#### Discussion

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_TEXT nodes with leading whitespace and before attribute names inside opening element tags.

### Mini-XML 2.3 mxmlSetCDATA

Set the element name of a CDATA node.

int mxmlSetCDATA (
mxml_node_t *node,
const char *data
);

#### Parameters

node
  Node to set
data
  New data string

#### Return Value

0 on success, -1 on failure

#### Discussion

The node is not changed if it (or its first child) is not a CDATA element node.

### Mini-XML 2.1 mxmlSetCustom

Set the data and destructor of a custom data node.

int mxmlSetCustom (
mxml_node_t *node,
void *data,
mxml_custom_destroy_cb_t destroy
);

#### Parameters

node
  Node to set
data
  New data pointer
destroy
  New destructor function

#### Return Value

0 on success, -1 on failure

#### Discussion

The node is not changed if it (or its first child) is not a custom node.

### mxmlSetCustomHandlers

Set the handling functions for custom data.

void mxmlSetCustomHandlers (
mxml_custom_load_cb_t load,
mxml_custom_save_cb_t save
);

#### Parameters

load
  Load function
save
  Save function

#### Discussion

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.

### mxmlSetElement

Set the name of an element node.

int mxmlSetElement (
mxml_node_t *node,
const char *name
);

#### Parameters

node
  Node to set
name
  New name string

#### Return Value

0 on success, -1 on failure

#### Discussion

The node is not changed if it is not an element node.

### mxmlSetErrorCallback

Set the error message callback.

void mxmlSetErrorCallback (
mxml_error_cb_t cb
);

#### Parameters

cb
  Error callback function

### mxmlSetInteger

Set the value of an integer node.

int mxmlSetInteger (
mxml_node_t *node,
int integer
);

#### Parameters

node
  Node to set
integer
  Integer value

#### Return Value

0 on success, -1 on failure

#### Discussion

The node is not changed if it (or its first child) is not an integer node.

### mxmlSetOpaque

Set the value of an opaque node.

int mxmlSetOpaque (
mxml_node_t *node,
const char *opaque
);

#### Parameters

node
  Node to set
opaque
  Opaque string

#### Return Value

0 on success, -1 on failure

#### Discussion

The node is not changed if it (or its first child) is not an opaque node.

### mxmlSetReal

Set the value of a real number node.

int mxmlSetReal (
mxml_node_t *node,
double real
);

#### Parameters

node
  Node to set
real
  Real number value

#### Return Value

0 on success, -1 on failure

#### Discussion

The node is not changed if it (or its first child) is not a real number node.

### mxmlSetText

Set the value of a text node.

int mxmlSetText (
mxml_node_t *node,
int whitespace,
const char *string
);

#### Parameters

node
  Node to set
whitespace
  1 = leading whitespace, 0 = no whitespace
string
  String

#### Return Value

0 on success, -1 on failure

#### Discussion

The node is not changed if it (or its first child) is not a text node.

### mxmlSetTextf

Set the value of a text node to a formatted string.

int mxmlSetTextf (
mxml_node_t *node,
int whitespace,
const char *format,
...
);

#### Parameters

node
  Node to set
whitespace
  1 = leading whitespace, 0 = no whitespace
format
  Printf-style format string
...
  Additional arguments as needed

#### Return Value

0 on success, -1 on failure

#### Discussion

The node is not changed if it (or its first child) is not a text node.

### Mini-XML 2.7 mxmlSetUserData

Set the user data pointer for a node.

int mxmlSetUserData (
mxml_node_t *node,
void *data
);

#### Parameters

node
  Node to set
data
  User data pointer

#### Return Value

0 on success, -1 on failure

### Mini-XML 2.3 mxmlSetWrapMargin

Set the wrap margin when saving XML data.

void mxmlSetWrapMargin (
int column
);

#### Parameters

column
  Column for wrapping, 0 to disable wrapping

#### Discussion

Wrapping is disabled when "column" is 0.

### mxmlWalkNext

Walk to the next logical node in the tree.

mxml_node_t *mxmlWalkNext (
mxml_node_t *node,
mxml_node_t *top,
int descend
);

#### Parameters

node
  Current node
top
  Top node
descend
  Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST

#### Return Value

Next node or NULL

#### Discussion

The descend argument controls whether the first child is considered to be the next node. The top node argument constrains the walk to the node's children.

### mxmlWalkPrev

Walk to the previous logical node in the tree.

mxml_node_t *mxmlWalkPrev (
mxml_node_t *node,
mxml_node_t *top,
int descend
);

#### Parameters

node
  Current node
top
  Top node
descend
  Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST

#### Return Value

Previous node or NULL

#### Discussion

The descend argument controls whether the previous node's last child is considered to be the previous node. The top node argument constrains the walk to the node's children.

## Data Types

### mxml_custom_destroy_cb_t

Custom data destructor

typedef void (*mxml_custom_destroy_cb_t)(void *);

### mxml_custom_load_cb_t

Custom data load callback function

typedef int (*mxml_custom_load_cb_t)(mxml_node_t *, const char *);

### mxml_custom_save_cb_t

Custom data save callback function

typedef char *(*mxml_custom_save_cb_t)(mxml_node_t *);

### mxml_entity_cb_t

Entity callback function

typedef int (*mxml_entity_cb_t)(const char *);

### mxml_error_cb_t

Error callback function

typedef void (*mxml_error_cb_t)(const char *);

### mxml_index_t

An XML node index.

typedef struct mxml_index_s mxml_index_t;

### mxml_load_cb_t

Load callback function

typedef mxml_type_t (*mxml_load_cb_t)(mxml_node_t *);

### mxml_node_t

An XML node.

typedef struct mxml_node_s mxml_node_t;

### mxml_save_cb_t

Save callback function

typedef const char *(*mxml_save_cb_t)(mxml_node_t *, int);

### mxml_sax_cb_t

SAX callback function

typedef void (*mxml_sax_cb_t)(mxml_node_t *, mxml_sax_event_t, void *);

### mxml_sax_event_t

SAX event type.

typedef enum mxml_sax_event_e mxml_sax_event_t;

### mxml_type_t

The XML node type.

typedef enum mxml_type_e mxml_type_t;

## Constants

### mxml_sax_event_e

SAX event type.

#### Constants

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

### mxml_type_e

The XML node type.

#### Constants

MXML_CUSTOM Mini-XML 2.1
  Custom data
MXML_ELEMENT
  XML element with attributes
MXML_IGNORE Mini-XML 2.3
  Ignore/throw away node
MXML_INTEGER
  Integer value
MXML_OPAQUE
  Opaque string
MXML_REAL
  Real value
MXML_TEXT
  Text fragment