Mini-XML is a small XML parsing library that you can use to read XML data files or strings in your application without requiring large non-standard libraries. Mini-XML only requires a "make" program and an ANSI C compatible compiler - GCC works, as do most vendors' ANSI C compilers.
Mini-XML provides the following functionality:
- Reading of UTF-8 and UTF-16 and writing of UTF-8 encoded XML files and strings.
- Data is stored in a linked-list tree structure, preserving the XML data hierarchy.
- SAX (streamed) reading of XML files and strings to minimize memory usage.
- Supports arbitrary element names, attributes, and attribute values with no preset limits, just available memory.
- Supports integer, real, opaque ("cdata"), and text data types in "leaf" nodes.
- Functions for creating and managing trees of data.
- "Find" and "walk" functions for easily locating and navigating trees of data.
Mini-XML doesn't do validation or other types of processing on the data based upon schema files or other sources of definition information.
Mini-XML comes with an autoconf-based configure script; just type the following command to get things going:
./configure
The default install prefix is /usr/local, which can be overridden using the
--prefix option:
./configure --prefix=/foo
Other configure options can be found using the --help option:
./configure --help
Once you have configured the software, type make to do the build and run
the test program to verify that things are working, as follows:
make
If you are using Mini-XML under Microsoft Windows with Visual C++, use the
included project files in the vcnet subdirectory to build the library
instead. Note: The static library on Windows is NOT thread-safe.
The install target will install Mini-XML in the lib and include
directories:
make install
Once you have installed it, use the -lmxml option to link your application
against it.
The documentation is available in the doc subdirectory in the files
mxml.html (HTML) and mxml.pdf (PDF). You can also look at the
testmxml.c and mxmldoc.c source files for examples of using Mini-XML.
Mini-XML provides a single header file which you include:
#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_OPAQUE_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_OPAQUE_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.minixml.org/",
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 ...
}
The mxmlFindPath() function finds the (first) value node under a specific
element using an XPath:
mxml_node_t *value = mxmlFindPath(tree, "path/to/*/foo/bar");
The mxmlGetInteger(), mxmlGetOpaque(), mxmlGetReal(), and
mxmlGetText() functions retrieve the value from a node:
mxml_node_t *node;
int intvalue = mxmlGetInteger(node);
const char *opaquevalue = mxmlGetOpaque(node);
double realvalue = mxmlGetReal(node);
int whitespacevalue;
const char *textvalue = mxmlGetText(node, &whitespacevalue);
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);
The Mini-XML project page provides access to the Github issue tracking page:
https://www.msweet.org/mxml
Copyright © 2003-2019 by Michael R Sweet
The Mini-XML library is licensed under the Apache License Version 2.0 with an exception to allow linking against GPL2/LGPL2-only software. See the files "LICENSE" and "NOTICE" for more information.