xml.c

Similar to the GLib Markup parser, which also just parses an xml subset, xml.c is a simple, small and self contained xml parser in one file. Ideal for embedding into other projects without the need for big external dependencies.

Usage

This example is also included in the repository and will be build by default. Most of the code is C boilerplate, the important functions are xml_parse_document, xml_document_root, xml_node_name, xml_node_content and xml_node_child / xml_node_children.

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <xml.h>



int main(int argc, char** argv) {

	/* XML source, could be read from disk
	 */
	uint8_t* source = ""
		"<Root>"
			"<Hello>World</Hello>"
			"<This>"
				"<Is>:-)</Is>"
				"<An>:-O</An>"
				"<Example>:-D</Example>"
			"</This>"
		"</Root>"
	;


	/* Parse the document
	 *
	 * Watch out: Remember not to free the source until you have freed the
	 *     document itself. If you have to free the source before, supply a
	 *     copy to xml_parse_document which can be freed together with the
	 *     document (`free_buffer' argument to `xml_document_free')
	 */
	struct xml_document* document = xml_parse_document(source, strlen(source));

	/* You _have_ to check the result of `xml_parse_document', if it's 0
	 * then the source could not be parsed. If you think this is a bug in
	 * xml.c, than use a debug build (cmake -DCMAKE_BUILD_TYPE=Debug) which
	 * will verbosely tell you about the parsing process
	 */
	if (!document) {
		printf("Could parse document\n");
		exit(EXIT_FAILURE);
	}
	struct xml_node* root = xml_document_root(document);


	/* Say Hello World :-)
	 */
	struct xml_node* root_hello = xml_node_child(root, 0);
	struct xml_string* hello = xml_node_name(root_hello);
	struct xml_string* world = xml_node_content(root_hello);

	/* Watch out: `xml_string_copy' will not 0-terminate your buffers! (but
	 *     `calloc' will :-)
	 */
	uint8_t* hello_0 = calloc(xml_string_length(hello) + 1, sizeof(uint8_t));
	uint8_t* world_0 = calloc(xml_string_length(world) + 1, sizeof(uint8_t));
	xml_string_copy(hello, hello_0, xml_string_length(hello));
	xml_string_copy(world, world_0, xml_string_length(world));

	printf("%s %s\n", hello_0, world_0);
	free(hello_0);
	free(world_0);


	/* Extract amount of Root/This children
	 */
	struct xml_node* root_this = xml_node_child(root, 1);
	printf("Root/This has %lu children\n", (unsigned long)xml_node_children(root_this));


	/* Remember to free the document or you'll risk a memory leak
	 */
	xml_document_free(document, false);
}

Another usage example can be found in the unit case.

License

libpng/zlib (BSD)