mxml/doc/mxml.3

.TH mxml 3 "Mini-XML API" "2024-03-07" "Mini-XML API"
.SH NAME
mxml \- Mini-XML API
.SH INCLUDE FILE
#include <mxml.h>
.SH LIBRARY
\-lmxml
.SH DESCRIPTION
Mini-XML is a small XML parsing library that you can use to
read XML and XML-like data files in your application without
requiring large non-standard libraries.  Mini-XML only
requires an ANSI C compatible compiler (GCC works, as do
most vendors' ANSI C compilers) and a "make" program.
.PP
Mini-XML provides the following functionality:
.IP \(bu 4
Reading of UTF-8 and UTF-16 and writing of UTF-8 encoded XML files and strings.
.IP \(bu 4
Data is stored in a linked-list tree structure,
preserving the XML data hierarchy.
.IP \(bu 4
Supports arbitrary element names, attributes, and attribute
values with no preset limits, just available memory.
.IP \(bu 4
Supports integer, real, opaque ("CDATA"), and text data types in
"leaf" nodes.
.IP \(bu 4
Functions for creating, indexing, and managing trees of data.
.IP \(bu 4
"Find" and "walk" functions for easily locating and navigating
trees of data.
.PP
Mini-XML doesn't do validation or other types of processing
on the data based upon schema files or other sources of
definition information, nor does it support character
entities other than those required by the XML
specification.
.SH USING MINI-XML
Mini-XML provides a single header file which you include:
.nf

    #include <mxml.h>
.fi
.PP
Nodes are defined by the "mxml_node_t" structure; the "type"
member defines the node type (element, integer, opaque,
real, or text) which determines which value you want to look
at in the "value" union.  New nodes can be created using the
"mxmlNewElement()", "mxmlNewInteger()", "mxmlNewOpaque()",
"mxmlNewReal()", and "mxmlNewText()" functions.  Only
elements can have child nodes, and the top node must be an
element, usually "?xml".
.PP
You load an XML file using the "mxmlLoadFile()" function:
.nf

    FILE *fp;
    mxml_node_t *tree;

    fp = fopen("filename.xml", "r");
    tree = mxmlLoadFile(NULL, fp, MXML_NO_CALLBACK);
    fclose(fp);
.fi
.PP
Similarly, you save an XML file using the "mxmlSaveFile()"
function:
.nf

    FILE *fp;
    mxml_node_t *tree;

    fp = fopen("filename.xml", "w");
    mxmlSaveFile(tree, fp, MXML_NO_CALLBACK);
    fclose(fp);
.fi
.PP
The "mxmlLoadString()", "mxmlSaveAllocString()", and
"mxmlSaveString()" functions load XML node trees from and save
XML node trees to strings:
.nf

    char buffer[8192];
    char *ptr;
    mxml_node_t *tree;

    ...
    tree = mxmlLoadString(NULL, buffer, MXML_NO_CALLBACK);

    ...
    mxmlSaveString(tree, buffer, sizeof(buffer),
                   MXML_NO_CALLBACK);

    ...
    ptr = mxmlSaveAllocString(tree, MXML_NO_CALLBACK);
.fi
.PP
You can find a named element/node using the "mxmlFindElement()"
function:
.nf

    mxml_node_t *node = mxmlFindElement(tree, tree, "name",
                                        "attr", "value",
                                        MXML_DESCEND);
.fi
.PP
The "name", "attr", and "value" arguments can be passed as
NULL to act as wildcards, e.g.:
.nf

    /* Find the first "a" element */
    node = mxmlFindElement(tree, tree, "a", NULL, NULL,
                           MXML_DESCEND);

    /* Find the first "a" element with "href" attribute */
    node = mxmlFindElement(tree, tree, "a", "href", NULL,
                           MXML_DESCEND);

    /* Find the first "a" element with "href" to a URL */
    node = mxmlFindElement(tree, tree, "a", "href",
                           "http://www.easysw.com/~mike/mxml/",
                           MXML_DESCEND);

    /* Find the first element with a "src" attribute*/
    node = mxmlFindElement(tree, tree, NULL, "src", NULL,
                           MXML_DESCEND);

    /* Find the first element with a "src" = "foo.jpg" */
    node = mxmlFindElement(tree, tree, NULL, "src",
                           "foo.jpg", MXML_DESCEND);
.fi
.PP
You can also iterate with the same function:
.nf

    mxml_node_t *node;

    for (node = mxmlFindElement(tree, tree, "name", NULL,
                                NULL, MXML_DESCEND);
         node != NULL;
         node = mxmlFindElement(node, tree, "name", NULL,
                                NULL, MXML_DESCEND))
    {
      ... do something ...
    }
.fi
.PP
To find the value of a specific node in the tree, use the "mxmlFindPath()"
function:
.nf

    mxml_node_t *value = mxmlFindPath(tree, "path/to/*/foo/bar");
.fi
.PP
The "mxmlGetInteger()", "mxmlGetOpaque()", "mxmlGetReal()", and "mxmlGetText()"
functions retrieve the value from a node:
.nf

    mxml_node_t *node;

    long intvalue = mxmlGetInteger(node);

    const char *opaquevalue = mxmlGetOpaque(node);

    double realvalue = mxmlGetReal(node);

    bool whitespacevalue;
    const char *textvalue = mxmlGetText(node, &whitespacevalue);
.fi
.PP
Finally, once you are done with the XML data, use the
"mxmlDelete()" function to recursively free the memory that
is used for a particular node or the entire tree:
.nf

    mxmlDelete(tree);
.fi
.SH ENUMERATIONS
.SS mxml_add_e
\fImxmlAdd\fR add values
.TP 5
MXML_ADD_AFTER
.br
Add node after specified node
.TP 5
MXML_ADD_BEFORE
.br
Add node before specified node
.SS mxml_descend_e
\fImxmlFindElement\fR, \fImxmlWalkNext\fR, and \fImxmlWalkPrev\fR descend values
.TP 5
MXML_DESCEND_ALL
.br
Descend when finding/walking
.TP 5
MXML_DESCEND_FIRST
.br
Descend for first find
.TP 5
MXML_DESCEND_NONE
.br
Don't descend when finding/walking
.SS mxml_sax_event_e
SAX event type.
.TP 5
MXML_SAX_EVENT_CDATA
.br
CDATA node
.TP 5
MXML_SAX_EVENT_COMMENT
.br
Comment node
.TP 5
MXML_SAX_EVENT_DATA
.br
Data node
.TP 5
MXML_SAX_EVENT_DECLARATION
.br
Declaration node
.TP 5
MXML_SAX_EVENT_DIRECTIVE
.br
Processing instruction node
.TP 5
MXML_SAX_EVENT_ELEMENT_CLOSE
.br
Element closed
.TP 5
MXML_SAX_EVENT_ELEMENT_OPEN
.br
Element opened
.SS mxml_type_e
The XML node type.
.TP 5
MXML_TYPE_CDATA
.br
CDATA value ("
.URL [CDATA[...]] [CDATA[...]]
")
.TP 5
MXML_TYPE_COMMENT
.br
Comment ("
.URL !--...-- !--...--
")
.TP 5
MXML_TYPE_CUSTOM
.br
Custom data
.TP 5
MXML_TYPE_DECLARATION
.br
Declaration ("
.URL !... !...
")
.TP 5
MXML_TYPE_DIRECTIVE
.br
Processing instruction ("
.URL ?...? ?...?
")
.TP 5
MXML_TYPE_ELEMENT
.br
XML element with attributes
.TP 5
MXML_TYPE_IGNORE
.br
Ignore/throw away node
.TP 5
MXML_TYPE_INTEGER
.br
Integer value
.TP 5
MXML_TYPE_OPAQUE
.br
Opaque string
.TP 5
MXML_TYPE_REAL
.br
Real value
.TP 5
MXML_TYPE_TEXT
.br
Text fragment
.SS mxml_ws_e
Whitespace periods
.TP 5
MXML_WS_AFTER_CLOSE
.br
Callback for after close tag
.TP 5
MXML_WS_AFTER_OPEN
.br
Callback for after open tag
.TP 5
MXML_WS_BEFORE_CLOSE
.br
Callback for before close tag
.TP 5
MXML_WS_BEFORE_OPEN
.br
Callback for before open tag
.SH FUNCTIONS
.SS mxmlAdd
Add a node to a tree.
.PP
.nf
void mxmlAdd (
    mxml_node_t *parent,
    mxml_add_t add,
    mxml_node_t *child,
    mxml_node_t *node
);
.fi
.PP
Adds the specified node to the parent.  If the child argument is not
\fBNULL\fR, puts the new node before or after the specified child depending
on the value of the \fBadd\fR argument.  If the child argument is \fBNULL\fR,
puts the new node at the beginning of the child list (\fBMXML_ADD_BEFORE\fR)
or at the end of the child list (\fBMXML_ADD_AFTER\fR).
.SS mxmlDelete
Delete a node and all of its children.
.PP
.nf
void mxmlDelete (
    mxml_node_t *node
);
.fi
.PP
If the specified node has a parent, this function first removes the
node from its parent using the \fImxmlRemove\fR function.
.SS mxmlElementDeleteAttr
Delete an attribute.
.PP
.nf
void mxmlElementDeleteAttr (
    mxml_node_t *node,
    const char *name
);
.fi
.SS mxmlElementGetAttr
Get an attribute.
.PP
.nf
const char * mxmlElementGetAttr (
    mxml_node_t *node,
    const char *name
);
.fi
.PP
This function returns \fBNULL\fR if the node is not an element or the
named attribute does not exist.
.SS mxmlElementGetAttrByIndex
Get an element attribute by index.
.PP
.nf
const char * mxmlElementGetAttrByIndex (
    mxml_node_t *node,
    int idx,
    const char **name
);
.fi
.PP
The index ("idx") is 0-based.  \fBNULL\fR is returned if the specified index
is out of range.
.SS mxmlElementGetAttrCount
Get the number of element attributes.
.PP
.nf
size_t  mxmlElementGetAttrCount (
    mxml_node_t *node
);
.fi
.SS mxmlElementSetAttr
Set an attribute.
.PP
.nf
void mxmlElementSetAttr (
    mxml_node_t *node,
    const char *name,
    const char *value
);
.fi
.PP
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.
.SS mxmlElementSetAttrf
Set an attribute with a formatted value.
.PP
.nf
void mxmlElementSetAttrf (
    mxml_node_t *node,
    const char *name,
    const char *format,
    ...
);
.fi
.PP
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.
.SS mxmlEntityAddCallback
Add a callback to convert entities to Unicode.
.PP
.nf
bool  mxmlEntityAddCallback (
    mxml_entity_cb_t cb,
    void *cbdata
);
.fi
.SS mxmlEntityGetValue
Get the character corresponding to a named entity.
.PP
.nf
int  mxmlEntityGetValue (
    const char *name
);
.fi
.PP
The entity name can also be a numeric constant. \fB-1\fR is returned if the
name is not known.
.SS mxmlEntityRemoveCallback
Remove a callback.
.PP
.nf
void mxmlEntityRemoveCallback (
    mxml_entity_cb_t cb
);
.fi
.SS mxmlFindElement
Find the named element.
.PP
.nf
mxml_node_t * mxmlFindElement (
    mxml_node_t *node,
    mxml_node_t *top,
    const char *element,
    const char *attr,
    const char *value,
    mxml_descend_t descend
);
.fi
.PP
The search is constrained by the name, attribute name, and value; any
\fBNULL\fR 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
\fBMXML_DESCEND_FIRST\fR for the initial search and \fBMXML_NO_DESCEND\fR
to find additional direct descendents of the node. The top node argument
constrains the search to a particular node's children.
.SS mxmlFindPath
Find a node with the given path.
.PP
.nf
mxml_node_t * mxmlFindPath (
    mxml_node_t *top,
    const char *path
);
.fi
.PP
The "path" is a slash-separated list of element names. The name "\fI" is
considered a wildcard for one or more levels of elements.  For example,
"foo/one/two", "bar/two/one", "\fR/one", and so forth.
.PP
The first child node of the found node is returned if the given node has
children and the first child is a value node.
.SS mxmlGetCDATA
Get the value for a CDATA node.
.PP
.nf
const char * mxmlGetCDATA (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node is not a CDATA element.
.SS mxmlGetComment
Get the value for a comment node.
.PP
.nf
const char * mxmlGetComment (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node is not a comment.
.SS mxmlGetCustom
Get the value for a custom node.
.PP
.nf
const void * mxmlGetCustom (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node (or its first child) is not a custom
value node.
.SS mxmlGetDeclaration
Get the value for a declaration node.
.PP
.nf
const char * mxmlGetDeclaration (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node is not a declaration.
.SS mxmlGetDirective
Get the value for a processing instruction node.
.PP
.nf
const char * mxmlGetDirective (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node is not a processing instruction.
.SS mxmlGetElement
Get the name for an element node.
.PP
.nf
const char * mxmlGetElement (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node is not an element node.
.SS mxmlGetFirstChild
Get the first child of an element node.
.PP
.nf
mxml_node_t * mxmlGetFirstChild (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node is not an element node or if the node
has no children.
.SS mxmlGetInteger
Get the integer value from the specified node or its
                     first child.
.PP
.nf
long  mxmlGetInteger (
    mxml_node_t *node
);
.fi
.PP
\fB0\fR is returned if the node (or its first child) is not an integer value node.
.SS mxmlGetLastChild
Get the last child of an element node.
.PP
.nf
mxml_node_t * mxmlGetLastChild (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node is not an element node or if the node
has no children.
.SS mxmlGetNextSibling

.PP
.nf
mxml_node_t * mxmlGetNextSibling (
    mxml_node_t *node
);
.fi
.SS mxmlGetOpaque
Get an opaque string value for a node or its first child.
.PP
.nf
const char * mxmlGetOpaque (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if the node (or its first child) is not an opaque
value node.
.SS mxmlGetParent
Get the parent node.
.PP
.nf
mxml_node_t * mxmlGetParent (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned for a root node.
.SS mxmlGetPrevSibling
Get the previous node for the current parent.
.PP
.nf
mxml_node_t * mxmlGetPrevSibling (
    mxml_node_t *node
);
.fi
.PP
\fBNULL\fR is returned if this is the first child for the current parent.
.SS mxmlGetReal
Get the real value for a node or its first child.
.PP
.nf
double  mxmlGetReal (
    mxml_node_t *node
);
.fi
.PP
0.0 is returned if the node (or its first child) is not a real value node.
.SS mxmlGetRefCount
Get the current reference (use) count for a node.
.PP
.nf
size_t  mxmlGetRefCount (
    mxml_node_t *node
);
.fi
.PP
The initial reference count of new nodes is 1. Use the \fImxmlRetain\fR
and \fImxmlRelease\fR functions to increment and decrement a node's
reference count.
.SS mxmlGetText
Get the text value for a node or its first child.
.PP
.nf
const char * mxmlGetText (
    mxml_node_t *node,
    bool *whitespace
);
.fi
.PP
\fBNULL\fR is returned if the node (or its first child) is not a text node.
The "whitespace" argument can be \fBNULL\fR.
.PP
Note: Text nodes consist of whitespace-delimited words. You will only get
single words of text when reading an XML file with \fBMXML_TYPE_TEXT\fR nodes.
If you want the entire string between elements in the XML file, you MUST read
the XML file with \fBMXML_TYPE_OPAQUE\fR nodes and get the resulting strings
using the \fImxmlGetOpaque\fR function instead.
.SS mxmlGetType
Get the node type.
.PP
.nf
mxml_type_t  mxmlGetType (
    mxml_node_t *node
);
.fi
.PP
\fBMXML_TYPE_IGNORE\fR is returned if "node" is \fBNULL\fR.
.SS mxmlGetUserData
Get the user data pointer for a node.
.PP
.nf
void * mxmlGetUserData (
    mxml_node_t *node
);
.fi
.SS mxmlIndexDelete
Delete an index.
.PP
.nf
void mxmlIndexDelete (
    mxml_index_t *ind
);
.fi
.SS mxmlIndexEnum
Return the next node in the index.
.PP
.nf
mxml_node_t * mxmlIndexEnum (
    mxml_index_t *ind
);
.fi
.PP
You should call \fImxmlIndexReset\fR prior to using this function to get
the first node in the index.  Nodes are returned in the sorted order of the
index.
.SS mxmlIndexFind
Find the next matching node.
.PP
.nf
mxml_node_t * mxmlIndexFind (
    mxml_index_t *ind,
    const char *element,
    const char *value
);
.fi
.PP
You should call \fImxmlIndexReset\fR prior to using this function for
the first time with a particular set of "element" and "value"
strings. Passing \fBNULL\fR for both "element" and "value" is equivalent
to calling \fImxmlIndexEnum\fR.
.SS mxmlIndexGetCount
Get the number of nodes in an index.
.PP
.nf
size_t  mxmlIndexGetCount (
    mxml_index_t *ind
);
.fi
.SS mxmlIndexNew
Create a new index.
.PP
.nf
mxml_index_t * mxmlIndexNew (
    mxml_node_t *node,
    const char *element,
    const char *attr
);
.fi
.PP
The index will contain all nodes that contain the named element and/or
attribute.  If both "element" and "attr" are \fBNULL\fR, 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.
.SS mxmlIndexReset
Reset the enumeration/find pointer in the index and
                     return the first node in the index.
.PP
.nf
mxml_node_t * mxmlIndexReset (
    mxml_index_t *ind
);
.fi
.PP
This function should be called prior to using \fImxmlIndexEnum\fR or
\fImxmlIndexFind\fR for the first time.
.SS mxmlLoadFd
Load a file descriptor into an XML node tree.
.PP
.nf
mxml_node_t * mxmlLoadFd (
    mxml_node_t *top,
    int fd,
    mxml_load_cb_t load_cb,
    void *load_cbdata,
    mxml_sax_cb_t sax_cb,
    void *sax_cbdata
);
.fi
.PP
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 
.URL ?xml ?xml
 for the entire file. The callback
function returns the value type that should be used for child nodes.
The constants \fBMXML_INTEGER_CALLBACK\fR, \fBMXML_OPAQUE_CALLBACK\fR,
\fBMXML_REAL_CALLBACK\fR, and \fBMXML_TEXT_CALLBACK\fR are defined for
loading child (data) nodes of the specified type.
.PP
Note: The most common programming error when using the Mini-XML library is
to load an XML file using the \fBMXML_TEXT_CALLBACK\fR, which returns inline
text as a series of whitespace-delimited words, instead of using the
\fBMXML_OPAQUE_CALLBACK\fR which returns the inline text as a single string
(including whitespace).
.SS mxmlLoadFile
Load a file into an XML node tree.
.PP
.nf
mxml_node_t * mxmlLoadFile (
    mxml_node_t *top,
    FILE *fp,
    mxml_load_cb_t load_cb,
    void *load_cbdata,
    mxml_sax_cb_t sax_cb,
    void *sax_cbdata
);
.fi
.PP
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 
.URL ?xml ?xml
 for the entire file. The callback
function returns the value type that should be used for child nodes.
The constants \fBMXML_INTEGER_CALLBACK\fR, \fBMXML_OPAQUE_CALLBACK\fR,
\fBMXML_REAL_CALLBACK\fR, and \fBMXML_TEXT_CALLBACK\fR are defined for
loading child (data) nodes of the specified type.
.PP
Note: The most common programming error when using the Mini-XML library is
to load an XML file using the \fBMXML_TEXT_CALLBACK\fR, which returns inline
text as a series of whitespace-delimited words, instead of using the
\fBMXML_OPAQUE_CALLBACK\fR which returns the inline text as a single string
(including whitespace).
.SS mxmlLoadFilename
Load a file into an XML node tree.
.PP
.nf
mxml_node_t * mxmlLoadFilename (
    mxml_node_t *top,
    const char *filename,
    mxml_load_cb_t load_cb,
    void *load_cbdata,
    mxml_sax_cb_t sax_cb,
    void *sax_cbdata
);
.fi
.PP
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 
.URL ?xml ?xml
 for the entire file. The callback
function returns the value type that should be used for child nodes.
The constants \fBMXML_INTEGER_CALLBACK\fR, \fBMXML_OPAQUE_CALLBACK\fR,
\fBMXML_REAL_CALLBACK\fR, and \fBMXML_TEXT_CALLBACK\fR are defined for
loading child (data) nodes of the specified type.
.PP
Note: The most common programming error when using the Mini-XML library is
to load an XML file using the \fBMXML_TEXT_CALLBACK\fR, which returns inline
text as a series of whitespace-delimited words, instead of using the
\fBMXML_OPAQUE_CALLBACK\fR which returns the inline text as a single string
(including whitespace).
.SS mxmlLoadIO
Load an XML node tree using a read callback.
.PP
.nf
mxml_node_t * mxmlLoadIO (
    mxml_node_t *top,
    mxml_read_cb_t read_cb,
    void *read_cbdata,
    mxml_load_cb_t load_cb,
    void *load_cbdata,
    mxml_sax_cb_t sax_cb,
    void *sax_cbdata
);
.fi
.PP
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 
.URL ?xml ?xml
 for the entire file. The callback
function returns the value type that should be used for child nodes.
The constants \fBMXML_INTEGER_CALLBACK\fR, \fBMXML_OPAQUE_CALLBACK\fR,
\fBMXML_REAL_CALLBACK\fR, and \fBMXML_TEXT_CALLBACK\fR are defined for
loading child (data) nodes of the specified type.
.PP
Note: The most common programming error when using the Mini-XML library is
to load an XML file using the \fBMXML_TEXT_CALLBACK\fR, which returns inline
text as a series of whitespace-delimited words, instead of using the
\fBMXML_OPAQUE_CALLBACK\fR which returns the inline text as a single string
(including whitespace).
.SS mxmlLoadString
Load a string into an XML node tree.
.PP
.nf
mxml_node_t * mxmlLoadString (
    mxml_node_t *top,
    const char *s,
    mxml_load_cb_t load_cb,
    void *load_cbdata,
    mxml_sax_cb_t sax_cb,
    void *sax_cbdata
);
.fi
.PP
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 
.URL ?xml ?xml
 for the entire string. The callback
function returns the value type that should be used for child nodes.
The constants \fBMXML_INTEGER_CALLBACK\fR, \fBMXML_OPAQUE_CALLBACK\fR,
\fBMXML_REAL_CALLBACK\fR, and \fBMXML_TEXT_CALLBACK\fR are defined for
loading child (data) nodes of the specified type.
.PP
Note: The most common programming error when using the Mini-XML library is
to load an XML file using the \fBMXML_TEXT_CALLBACK\fR, which returns inline
text as a series of whitespace-delimited words, instead of using the
\fBMXML_OPAQUE_CALLBACK\fR which returns the inline text as a single string
(including whitespace).
.SS mxmlNewCDATA
Create a new CDATA node.
.PP
.nf
mxml_node_t * mxmlNewCDATA (
    mxml_node_t *parent,
    const char *data
);
.fi
.PP
The new CDATA node is added to the end of the specified parent's child
list.  The constant \fBMXML_NO_PARENT\fR 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
\fBMXML_TYPE_ELEMENT\fR type.
.SS mxmlNewCDATAf
Create a new formatted CDATA node.
.PP
.nf
mxml_node_t * mxmlNewCDATAf (
    mxml_node_t *parent,
    const char *format,
    ...
);
.fi
.PP
The new CDATA node is added to the end of the specified parent's
child list.  The constant \fBMXML_NO_PARENT\fR 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.
.SS mxmlNewComment
Create a new comment node.
.PP
.nf
mxml_node_t * mxmlNewComment (
    mxml_node_t *parent,
    const char *comment
);
.fi
.PP
The new comment node is added to the end of the specified parent's child
list.  The constant \fBMXML_NO_PARENT\fR can be used to specify that the new
comment node has no parent.  The comment string must be nul-terminated and
is copied into the new node.
.SS mxmlNewCommentf
Create a new formatted comment string node.
.PP
.nf
mxml_node_t * mxmlNewCommentf (
    mxml_node_t *parent,
    const char *format,
    ...
);
.fi
.PP
The new comment string node is added to the end of the specified parent's
child list.  The constant \fBMXML_NO_PARENT\fR 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.
.SS mxmlNewCustom
Create a new custom data node.
.PP
.nf
mxml_node_t * mxmlNewCustom (
    mxml_node_t *parent,
    void *data,
    mxml_custom_destroy_cb_t destroy
);
.fi
.PP
The new custom node is added to the end of the specified parent's child
list. The constant \fBMXML_NO_PARENT\fR can be used to specify that the new
element node has no parent. \fBNULL\fR can be passed when the data in the
node is not dynamically allocated or is separately managed.
.SS mxmlNewDeclaration
Create a new declaraction node.
.PP
.nf
mxml_node_t * mxmlNewDeclaration (
    mxml_node_t *parent,
    const char *declaration
);
.fi
.PP
The new declaration node is added to the end of the specified parent's child
list.  The constant \fBMXML_NO_PARENT\fR can be used to specify that the new
declaration node has no parent.  The declaration string must be nul-
terminated and is copied into the new node.
.SS mxmlNewDeclarationf
Create a new formatted declaration node.
.PP
.nf
mxml_node_t * mxmlNewDeclarationf (
    mxml_node_t *parent,
    const char *format,
    ...
);
.fi
.PP
The new declaration node is added to the end of the specified parent's
child list.  The constant \fBMXML_NO_PARENT\fR 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.
.SS mxmlNewDirective
Create a new processing instruction node.
.PP
.nf
mxml_node_t * mxmlNewDirective (
    mxml_node_t *parent,
    const char *directive
);
.fi
.PP
The new processing instruction node is added to the end of the specified
parent's child list.  The constant \fBMXML_NO_PARENT\fR can be used to specify
that the new processing instruction node has no parent.  The data string must
be nul-terminated and is copied into the new node.
.SS mxmlNewDirectivef
Create a new formatted processing instruction node.
.PP
.nf
mxml_node_t * mxmlNewDirectivef (
    mxml_node_t *parent,
    const char *format,
    ...
);
.fi
.PP
The new processing instruction node is added to the end of the specified parent's
child list.  The constant \fBMXML_NO_PARENT\fR 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.
.SS mxmlNewElement
Create a new element node.
.PP
.nf
mxml_node_t * mxmlNewElement (
    mxml_node_t *parent,
    const char *name
);
.fi
.PP
The new element node is added to the end of the specified parent's child
list. The constant \fBMXML_NO_PARENT\fR can be used to specify that the new
element node has no parent.
.SS mxmlNewInteger
Create a new integer node.
.PP
.nf
mxml_node_t * mxmlNewInteger (
    mxml_node_t *parent,
    long integer
);
.fi
.PP
The new integer node is added to the end of the specified parent's child
list. The constant \fBMXML_NO_PARENT\fR can be used to specify that the new
integer node has no parent.
.SS mxmlNewOpaque
Create a new opaque string.
.PP
.nf
mxml_node_t * mxmlNewOpaque (
    mxml_node_t *parent,
    const char *opaque
);
.fi
.PP
The new opaque string node is added to the end of the specified parent's
child list.  The constant \fBMXML_NO_PARENT\fR 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.
.SS mxmlNewOpaquef
Create a new formatted opaque string node.
.PP
.nf
mxml_node_t * mxmlNewOpaquef (
    mxml_node_t *parent,
    const char *format,
    ...
);
.fi
.PP
The new opaque string node is added to the end of the specified parent's
child list.  The constant \fBMXML_NO_PARENT\fR 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.
.SS mxmlNewReal
Create a new real number node.
.PP
.nf
mxml_node_t * mxmlNewReal (
    mxml_node_t *parent,
    double real
);
.fi
.PP
The new real number node is added to the end of the specified parent's
child list.  The constant \fBMXML_NO_PARENT\fR can be used to specify that
the new real number node has no parent.
.SS mxmlNewText
Create a new text fragment node.
.PP
.nf
mxml_node_t * mxmlNewText (
    mxml_node_t *parent,
    bool whitespace,
    const char *string
);
.fi
.PP
The new text node is added to the end of the specified parent's child
list.  The constant \fBMXML_NO_PARENT\fR 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.
.SS mxmlNewTextf
Create a new formatted text fragment node.
.PP
.nf
mxml_node_t * mxmlNewTextf (
    mxml_node_t *parent,
    bool whitespace,
    const char *format,
    ...
);
.fi
.PP
The new text node is added to the end of the specified parent's child
list.  The constant \fBMXML_NO_PARENT\fR 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.
.SS mxmlNewXML
Create a new XML document tree.
.PP
.nf
mxml_node_t * mxmlNewXML (
    const char *version
);
.fi
.PP
The "version" argument specifies the version number to put in the
?xml directive node. If \fBNULL\fR, version "1.0" is assumed.
.SS mxmlRelease
Release a node.
.PP
.nf
int  mxmlRelease (
    mxml_node_t *node
);
.fi
.PP
When the reference count reaches zero, the node (and any children)
is deleted via \fImxmlDelete\fR.
.SS mxmlRemove
Remove a node from its parent.
.PP
.nf
void mxmlRemove (
    mxml_node_t *node
);
.fi
.PP
This function does not free memory used by the node - use \fImxmlDelete\fR
for that.  This function does nothing if the node has no parent.
.SS mxmlRetain
Retain a node.
.PP
.nf
int  mxmlRetain (
    mxml_node_t *node
);
.fi
.SS mxmlSaveAllocString
Save an XML tree to an allocated string.
.PP
.nf
char * mxmlSaveAllocString (
    mxml_node_t *node,
    mxml_save_cb_t save_cb,
    void *save_cbdata
);
.fi
.PP
This function returns a pointer to a string containing the textual
representation of the XML node tree.  The string should be freed
using \fBfree()\fR when you are done with it.  \fBNULL\fR is returned if the node
would produce an empty string or if the string cannot be allocated.
.PP
The callback argument specifies a function that returns a whitespace
string or \fBNULL\fR before and after each element.  If \fBMXML_NO_CALLBACK\fR
is specified, whitespace will only be added before \fBMXML_TYPE_TEXT\fR nodes
with leading whitespace and before attribute names inside opening
element tags.
.SS mxmlSaveFd
Save an XML tree to a file descriptor.
.PP
.nf
bool  mxmlSaveFd (
    mxml_node_t *node,
    int fd,
    mxml_save_cb_t save_cb,
    void *save_cbdata
);
.fi
.PP
The callback argument specifies a function that returns a whitespace
string or NULL before and after each element. If \fBMXML_NO_CALLBACK\fR
is specified, whitespace will only be added before \fBMXML_TYPE_TEXT\fR nodes
with leading whitespace and before attribute names inside opening
element tags.
.SS mxmlSaveFile
Save an XML tree to a file.
.PP
.nf
bool  mxmlSaveFile (
    mxml_node_t *node,
    FILE *fp,
    mxml_save_cb_t save_cb,
    void *save_cbdata
);
.fi
.PP
The callback argument specifies a function that returns a whitespace
string or NULL before and after each element. If \fBMXML_NO_CALLBACK\fR
is specified, whitespace will only be added before \fBMXML_TYPE_TEXT\fR nodes
with leading whitespace and before attribute names inside opening
element tags.
.SS mxmlSaveFilename
Save an XML tree to a file.
.PP
.nf
bool  mxmlSaveFilename (
    mxml_node_t *node,
    const char *filename,
    mxml_save_cb_t save_cb,
    void *save_cbdata
);
.fi
.PP
The callback argument specifies a function that returns a whitespace
string or NULL before and after each element. If \fBMXML_NO_CALLBACK\fR
is specified, whitespace will only be added before \fBMXML_TYPE_TEXT\fR nodes
with leading whitespace and before attribute names inside opening
element tags.
.SS mxmlSaveIO
Save an XML tree using a callback.
.PP
.nf
bool  mxmlSaveIO (
    mxml_node_t *node,
    mxml_write_cb_t write_cb,
    void *write_cbdata,
    mxml_save_cb_t save_cb,
    void *save_cbdata
);
.fi
.PP
The callback argument specifies a function that returns a whitespace
string or NULL before and after each element. If \fBMXML_NO_CALLBACK\fR
is specified, whitespace will only be added before \fBMXML_TYPE_TEXT\fR nodes
with leading whitespace and before attribute names inside opening
element tags.
.SS mxmlSaveString
Save an XML node tree to a string.
.PP
.nf
size_t  mxmlSaveString (
    mxml_node_t *node,
    char *buffer,
    size_t bufsize,
    mxml_save_cb_t save_cb,
    void *save_cbdata
);
.fi
.PP
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.
.PP
The callback argument specifies a function that returns a whitespace
string or NULL before and after each element. If \fBMXML_NO_CALLBACK\fR
is specified, whitespace will only be added before \fBMXML_TYPE_TEXT\fR nodes
with leading whitespace and before attribute names inside opening
element tags.
.SS mxmlSetCDATA
Set the data for a CDATA node.
.PP
.nf
bool  mxmlSetCDATA (
    mxml_node_t *node,
    const char *data
);
.fi
.PP
The node is not changed if it (or its first child) is not a CDATA node.
.SS mxmlSetCDATAf
Set the data for a CDATA to a formatted string.
.PP
.nf
bool  mxmlSetCDATAf (
    mxml_node_t *node,
    const char *format,
    ...
);
.fi
.SS mxmlSetComment
Set a comment to a literal string.
.PP
.nf
bool  mxmlSetComment (
    mxml_node_t *node,
    const char *comment
);
.fi
.SS mxmlSetCommentf
Set a comment to a formatted string.
.PP
.nf
bool  mxmlSetCommentf (
    mxml_node_t *node,
    const char *format,
    ...
);
.fi
.SS mxmlSetCustom
Set the data and destructor of a custom data node.
.PP
.nf
bool  mxmlSetCustom (
    mxml_node_t *node,
    void *data,
    mxml_custom_destroy_cb_t destroy
);
.fi
.PP
The node is not changed if it (or its first child) is not a custom node.
.SS mxmlSetDeclaration
Set a comment to a literal string.
.PP
.nf
bool  mxmlSetDeclaration (
    mxml_node_t *node,
    const char *declaration
);
.fi
.SS mxmlSetDeclarationf
Set a comment to a formatted string.
.PP
.nf
bool  mxmlSetDeclarationf (
    mxml_node_t *node,
    const char *format,
    ...
);
.fi
.SS mxmlSetDirective
Set a directive to a literal string.
.PP
.nf
bool  mxmlSetDirective (
    mxml_node_t *node,
    const char *directive
);
.fi
.SS mxmlSetDirectivef
Set a directive to a formatted string.
.PP
.nf
bool  mxmlSetDirectivef (
    mxml_node_t *node,
    const char *format,
    ...
);
.fi
.SS mxmlSetElement
Set the name of an element node.
.PP
.nf
bool  mxmlSetElement (
    mxml_node_t *node,
    const char *name
);
.fi
.PP
The node is not changed if it is not an element node.
.SS mxmlSetInteger
Set the value of an integer node.
.PP
.nf
bool  mxmlSetInteger (
    mxml_node_t *node,
    long integer
);
.fi
.PP
The node is not changed if it (or its first child) is not an integer node.
.SS mxmlSetOpaque
Set the value of an opaque node.
.PP
.nf
bool  mxmlSetOpaque (
    mxml_node_t *node,
    const char *opaque
);
.fi
.PP
The node is not changed if it (or its first child) is not an opaque node.
.SS mxmlSetOpaquef
Set the value of an opaque string node to a formatted string.
.PP
.nf
bool  mxmlSetOpaquef (
    mxml_node_t *node,
    const char *format,
    ...
);
.fi
.PP
The node is not changed if it (or its first child) is not an opaque node.
.SS mxmlSetReal
Set the value of a real number node.
.PP
.nf
bool  mxmlSetReal (
    mxml_node_t *node,
    double real
);
.fi
.PP
The node is not changed if it (or its first child) is not a real number node.
.SS mxmlSetText
Set the value of a text node.
.PP
.nf
bool  mxmlSetText (
    mxml_node_t *node,
    bool whitespace,
    const char *string
);
.fi
.PP
The node is not changed if it (or its first child) is not a text node.
.SS mxmlSetTextf
Set the value of a text node to a formatted string.
.PP
.nf
bool  mxmlSetTextf (
    mxml_node_t *node,
    bool whitespace,
    const char *format,
    ...
);
.fi
.PP
The node is not changed if it (or its first child) is not a text node.
.SS mxmlSetUserData
Set the user data pointer for a node.
.PP
.nf
bool  mxmlSetUserData (
    mxml_node_t *node,
    void *data
);
.fi
.SS mxmlSetWrapMargin
Set the wrap margin when saving XML data.
.PP
.nf
void mxmlSetWrapMargin (
    int column
);
.fi
.PP
Wrapping is disabled when "column" is 0.
.SS mxmlWalkNext
Walk to the next logical node in the tree.
.PP
.nf
mxml_node_t * mxmlWalkNext (
    mxml_node_t *node,
    mxml_node_t *top,
    mxml_descend_t descend
);
.fi
.PP
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.
.SS mxmlWalkPrev
Walk to the previous logical node in the tree.
.PP
.nf
mxml_node_t * mxmlWalkPrev (
    mxml_node_t *node,
    mxml_node_t *top,
    mxml_descend_t descend
);
.fi
.PP
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.
.SH TYPES
.SS mxml_add_t
\fImxmlAdd\fR add values
.PP
.nf
typedef enum mxml_add_e mxml_add_t;
.fi
.SS mxml_custom_destroy_cb_t
Custom data destructor
.PP
.nf
typedef void(*)(void *) mxml_custom_destroy_cb_t;
.fi
.SS mxml_custom_load_cb_t
Custom data load callback function
.PP
.nf
typedef bool(*)(void *cbdata mxml_node_t *node const char *s) mxml_custom_load_cb_t;
.fi
.SS mxml_custom_save_cb_t
Custom data save callback function
.PP
.nf
typedef char *(*)(void *cbdata mxml_node_t *node) mxml_custom_save_cb_t;
.fi
.SS mxml_descend_t
\fImxmlFindElement\fR, \fImxmlWalkNext\fR, and \fImxmlWalkPrev\fR descend values
.PP
.nf
typedef enum mxml_descend_e mxml_descend_t;
.fi
.SS mxml_entity_cb_t
Entity callback function
.PP
.nf
typedef int(*)(void *cbdata const char *name) mxml_entity_cb_t;
.fi
.SS mxml_error_cb_t
Error callback function
.PP
.nf
typedef void(*)(void *cbdata const char *message) mxml_error_cb_t;
.fi
.SS mxml_index_t
An XML node index.
.PP
.nf
typedef struct _mxml_index_s mxml_index_t;
.fi
.SS mxml_load_cb_t
Load callback function
.PP
.nf
typedef mxml_type_t(*)(void *cbdata mxml_node_t *node) mxml_load_cb_t;
.fi
.SS mxml_node_t
An XML node.
.PP
.nf
typedef struct _mxml_node_s mxml_node_t;
.fi
.SS mxml_read_cb_t
Read callback function
.PP
.nf
typedef ssize_t(*)(void *cbdata void *buffer size_t bytes) mxml_read_cb_t;
.fi
.SS mxml_save_cb_t
Save callback function
.PP
.nf
typedef const char *(*)(void *cbdata mxml_node_t *node mxml_ws_t when) mxml_save_cb_t;
.fi
.SS mxml_sax_cb_t
SAX callback function
.PP
.nf
typedef bool(*)(void *cbdata mxml_node_t *node mxml_sax_event_t event) mxml_sax_cb_t;
.fi
.SS mxml_sax_event_t
SAX event type.
.PP
.nf
typedef enum mxml_sax_event_e mxml_sax_event_t;
.fi
.SS mxml_strcopy_cb_t
String copy/allocation callback
.PP
.nf
typedef char *(*)(void *cbdata const char *s) mxml_strcopy_cb_t;
.fi
.SS mxml_strfree_cb_t
String free callback
.PP
.nf
typedef void(*)(void *cbdata char *s) mxml_strfree_cb_t;
.fi
.SS mxml_type_t
The XML node type.
.PP
.nf
typedef enum mxml_type_e mxml_type_t;
.fi
.SS mxml_write_cb_t
Write callback function
.PP
.nf
typedef ssize_t(*)(void *cbdata const void *buffer size_t bytes) mxml_write_cb_t;
.fi
.SS mxml_ws_t
Whitespace periods
.PP
.nf
typedef enum mxml_ws_e mxml_ws_t;
.fi
.SH SEE ALSO
Mini-XML Programmers Manual, https://www.msweet.org/mxml
.SH COPYRIGHT
Copyright \[co] 2003-2021 by Michael R Sweet.