Mini-XML provides the following functionality:
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.
#include <mxml.h>
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".
You load an XML file using the "mxmlLoadFile()" function:
FILE *fp;
mxml_node_t *tree;
fp = fopen("filename.xml", "r");
tree = mxmlLoadFile(NULL, fp, MXML_NO_CALLBACK);
fclose(fp);
Similarly, you save an XML file using the "mxmlSaveFile()" function:
FILE *fp;
mxml_node_t *tree;
fp = fopen("filename.xml", "w");
mxmlSaveFile(tree, fp, MXML_NO_CALLBACK);
fclose(fp);
The "mxmlLoadString()", "mxmlSaveAllocString()", and "mxmlSaveString()" functions load XML node trees from and save XML node trees to strings:
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);
You can find a named element/node using the "mxmlFindElement()" function:
mxml_node_t *node = mxmlFindElement(tree, tree, "name",
"attr", "value",
MXML_DESCEND);
The "name", "attr", and "value" arguments can be passed as NULL to act as wildcards, e.g.:
/* 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);
You can also iterate with the same function:
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 ...
}
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:
mxmlDelete(tree);
void mxmlAdd (
mxml_node_t *parent,
int where,
mxml_node_t *child,
mxml_node_t *node
);
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.
void mxmlDelete (
mxml_node_t *node
);
If the specified node has a parent, this function first removes the node from its parent using the mxmlRemove() function.
void mxmlElementDeleteAttr (
mxml_node_t *node,
const char *name
);
const char * mxmlElementGetAttr (
mxml_node_t *node,
const char *name
);
This function returns NULL if the node is not an element or the named attribute does not exist.
void mxmlElementSetAttr (
mxml_node_t *node,
const char *name,
const char *value
);
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.
void mxmlElementSetAttrf (
mxml_node_t *node,
const char *name,
const char *format,
...
);
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.
int mxmlEntityAddCallback (
mxml_entity_cb_t cb
);
const char * mxmlEntityGetName (
int val
);
If val does not need to be represented by a named entity, NULL is returned.
int mxmlEntityGetValue (
const char *name
);
The entity name can also be a numeric constant. -1 is returned if the name is not known.
void mxmlEntityRemoveCallback (
mxml_entity_cb_t cb
);
mxml_node_t * mxmlFindElement (
mxml_node_t *node,
mxml_node_t *top,
const char *name,
const char *attr,
const char *value,
int descend
);
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.
void mxmlIndexDelete (
mxml_index_t *ind
);
mxml_node_t * mxmlIndexEnum (
mxml_index_t *ind
);
Nodes are returned in the sorted order of the index.
mxml_node_t * mxmlIndexFind (
mxml_index_t *ind,
const char *element,
const char *value
);
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().
mxml_index_t * mxmlIndexNew (
mxml_node_t *node,
const char *element,
const char *attr
);
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.
mxml_node_t * mxmlIndexReset (
mxml_index_t *ind
);
This function should be called prior to using mxmlIndexEnum() or mxmlIndexFind() for the first time.
mxml_node_t * mxmlLoadFd (
mxml_node_t *top,
int fd,
mxml_load_cb_t cb
);
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.
mxml_node_t * mxmlLoadFile (
mxml_node_t *top,
FILE *fp,
mxml_load_cb_t cb
);
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.
mxml_node_t * mxmlLoadString (
mxml_node_t *top,
const char *s,
mxml_load_cb_t cb
);
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.
mxml_node_t * mxmlNewCDATA (
mxml_node_t *parent,
const char *data
);
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.
mxml_node_t * mxmlNewCustom (
mxml_node_t *parent,
void *data,
mxml_custom_destroy_cb_t destroy
);
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.
mxml_node_t * mxmlNewElement (
mxml_node_t *parent,
const char *name
);
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.
mxml_node_t * mxmlNewInteger (
mxml_node_t *parent,
int integer
);
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.
mxml_node_t * mxmlNewOpaque (
mxml_node_t *parent,
const char *opaque
);
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.
mxml_node_t * mxmlNewReal (
mxml_node_t *parent,
double real
);
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.
mxml_node_t * mxmlNewText (
mxml_node_t *parent,
int whitespace,
const char *string
);
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.
mxml_node_t * mxmlNewTextf (
mxml_node_t *parent,
int whitespace,
const char *format,
...
);
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.
mxml_node_t * mxmlNewXML (
const char *version
);
The "version" argument specifies the version number to put in the ?xml element node. If NULL, version 1.0 is assumed.
int mxmlRelease (
mxml_node_t *node
);
When the reference count reaches zero, the node (and any children) is deleted via mxmlDelete().
void mxmlRemove (
mxml_node_t *node
);
Does not free memory used by the node - use mxmlDelete() for that. This function does nothing if the node has no parent.
int mxmlRetain (
mxml_node_t *node
);
mxml_node_t * mxmlSAXLoadFd (
mxml_node_t *top,
int fd,
mxml_load_cb_t cb,
mxml_sax_cb_t sax_cb,
void *sax_data
);
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.
mxml_node_t * mxmlSAXLoadFile (
mxml_node_t *top,
FILE *fp,
mxml_load_cb_t cb,
mxml_sax_cb_t sax_cb,
void *sax_data
);
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.
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
);
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.
char * mxmlSaveAllocString (
mxml_node_t *node,
mxml_save_cb_t cb
);
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.
int mxmlSaveFd (
mxml_node_t *node,
int fd,
mxml_save_cb_t cb
);
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.
int mxmlSaveFile (
mxml_node_t *node,
FILE *fp,
mxml_save_cb_t cb
);
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.
int mxmlSaveString (
mxml_node_t *node,
char *buffer,
int bufsize,
mxml_save_cb_t cb
);
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.
int mxmlSetCDATA (
mxml_node_t *node,
const char *data
);
The node is not changed if it is not a CDATA element node.
int mxmlSetCustom (
mxml_node_t *node,
void *data,
mxml_custom_destroy_cb_t destroy
);
The node is not changed if it is not a custom node.
void mxmlSetCustomHandlers (
mxml_custom_load_cb_t load,
mxml_custom_save_cb_t save
);
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.
int mxmlSetElement (
mxml_node_t *node,
const char *name
);
The node is not changed if it is not an element node.
void mxmlSetErrorCallback (
mxml_error_cb_t cb
);
int mxmlSetInteger (
mxml_node_t *node,
int integer
);
The node is not changed if it is not an integer node.
int mxmlSetOpaque (
mxml_node_t *node,
const char *opaque
);
The node is not changed if it is not an opaque node.
int mxmlSetReal (
mxml_node_t *node,
double real
);
The node is not changed if it is not a real number node.
int mxmlSetText (
mxml_node_t *node,
int whitespace,
const char *string
);
The node is not changed if it is not a text node.
int mxmlSetTextf (
mxml_node_t *node,
int whitespace,
const char *format,
...
);
The node is not changed if it is not a text node.
void mxmlSetWrapMargin (
int column
);
Wrapping is disabled when "column" is 0.
mxml_node_t * mxmlWalkNext (
mxml_node_t *node,
mxml_node_t *top,
int descend
);
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.
mxml_node_t * mxmlWalkPrev (
mxml_node_t *node,
mxml_node_t *top,
int descend
);
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.
struct mxml_attr_s
{
char *name;
char *value;
};
struct mxml_custom_s
{
void *data;
mxml_custom_destroy_cb_t destroy;
};
struct mxml_element_s
{
mxml_attr_t *attrs;
char *name;
int num_attrs;
};
struct mxml_index_s
{
int alloc_nodes;
char *attr;
int cur_node;
mxml_node_t **nodes;
int num_nodes;
};
struct mxml_node_s
{
struct mxml_node_s *child;
struct mxml_node_s *last_child;
struct mxml_node_s *next;
struct mxml_node_s *parent;
struct mxml_node_s *prev;
int ref_count;
mxml_type_t type;
void *user_data;
mxml_value_t value;
};
struct mxml_text_s
{
char *string;
int whitespace;
};
typedef struct mxml_attr_s mxml_attr_t;
typedef void(*)(void *) mxml_custom_destroy_cb_t;
typedef int(*)(mxml_node_t *, const char *) mxml_custom_load_cb_t;
typedef char *(*)(mxml_node_t *) mxml_custom_save_cb_t;
typedef struct mxml_custom_s mxml_custom_t;
typedef struct mxml_element_s mxml_element_t;
typedef int(*)(const char *) mxml_entity_cb_t;
typedef void(*)(const char *) mxml_error_cb_t;
typedef struct mxml_index_s mxml_index_t;
typedef mxml_type_t(*)(mxml_node_t *) mxml_load_cb_t;
typedef struct mxml_node_s mxml_node_t;
typedef const char *(*)(mxml_node_t *, int) mxml_save_cb_t;
typedef void(*)(mxml_node_t *, mxml_sax_event_t, void *) mxml_sax_cb_t;
typedef enum mxml_sax_event_e mxml_sax_event_t;
typedef struct mxml_text_s mxml_text_t;
typedef enum mxml_type_e mxml_type_t;
typedef union mxml_value_u mxml_value_t;
union mxml_value_u
{
mxml_custom_t custom;
mxml_element_t element;
int integer;
char *opaque;
double real;
mxml_text_t text;
};