Mini-XML API Reference
Author: Michael R Sweet

# Appendix B - Library Reference

## Contents

- Functions
  - mxmlAdd
  - mxmlDelete
  - mxmlElementDeleteAttr
  - mxmlElementGetAttr
  - mxmlElementGetAttrByIndex
  - mxmlElementGetAttrCount
  - 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
  - mxmlNewOpaquef
  - mxmlNewReal
  - mxmlNewText
  - mxmlNewTextf
  - mxmlNewXML
  - mxmlRelease
  - mxmlRemove
  - mxmlRetain
  - mxmlSAXLoadFd
  - mxmlSAXLoadFile
  - mxmlSAXLoadString
  - mxmlSaveAllocString
  - mxmlSaveFd
  - mxmlSaveFile
  - mxmlSaveString
  - mxmlSetCDATA
  - mxmlSetCustom
  - mxmlSetCustomHandlers
  - mxmlSetElement
  - mxmlSetErrorCallback
  - mxmlSetInteger
  - mxmlSetOpaque
  - mxmlSetOpaquef
  - 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
- Enumerations
  - 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.

### Mini-XML 2.11 mxmlElementGetAttrByIndex

Get an element attribute by index.

const char *mxmlElementGetAttrByIndex(mxml_node_t *node, int idx, const char **name);

#### Parameters

node | Node
idx | Attribute index, starting at 0
name | Attribute name

#### Return Value

Attribute value

#### Discussion

The index ("idx") is 0-based. `NULL` is returned if the specified index is out of range.

### Mini-XML 2.11 mxmlElementGetAttrCount

Get the number of element attributes.

int mxmlElementGetAttrCount(mxml_node_t *node);

#### Parameters

node | Node

#### Return Value

Number of attributes

### 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 *element, const char *attr, const char *value, int descend);

#### Parameters

node | Current node
top | Top node
element | 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

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`.
Note: Text nodes consist of whitespace-delimited words. You will only get single words of text when reading an XML file with `MXML_TEXT` nodes. If you want the entire string between elements in the XML file, you MUST read the XML file with `MXML_OPAQUE` nodes and get the resulting strings using the `mxmlGetOpaque` function instead.

### 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

You should call `mxmlIndexReset` prior to using this function to get the first node in the index. 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 constant

#### 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. The constants `MXML_INTEGER_CALLBACK`, `MXML_OPAQUE_CALLBACK`, `MXML_REAL_CALLBACK`, and `MXML_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).

### 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 constant

#### 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. The constants `MXML_INTEGER_CALLBACK`, `MXML_OPAQUE_CALLBACK`, `MXML_REAL_CALLBACK`, and `MXML_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).

### 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 constant

#### 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. The constants `MXML_INTEGER_CALLBACK`, `MXML_OPAQUE_CALLBACK`, `MXML_REAL_CALLBACK`, and `MXML_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).

### 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 currently 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 string 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 string node has no parent. The opaque string must be nul- terminated and is copied into the new node.

### mxmlNewOpaquef

Create a new formatted opaque string node.

mxml_node_t *mxmlNewOpaquef(mxml_node_t *parent, const char *format, ...);

#### Parameters

parent | Parent node or `MXML_NO_PARENT`
format | Printf-style format string
... | Additional args as needed

#### Return Value

New node

#### Discussion

The new opaque string 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 string node has no parent. The format string must be nul-terminated and is formatted 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 format 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

This function 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 constant
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. 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 constant
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. 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 constant
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. 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.

### Mini-XML 2.11 mxmlSetOpaquef

Set the value of an opaque string node to a formatted string.

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

#### Parameters

node | Node to set
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 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