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libxml
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#include "unity/unity.h"
#include <libxml/HTMLtree.h>

#include <libxml/tree.h>
#include <libxml/xmlIO.h>
#include <libxml/parser.h>
#include <string.h>
#include <stdlib.h>

/* Wrapper provided in the module for testing the static function */
extern void test_htmlDtdDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc, const char *encoding);

static char* run_dump_and_get_string(xmlDocPtr doc) {
    xmlBufferPtr xbuf = xmlBufferCreate();
    TEST_ASSERT_NOT_NULL_MESSAGE(xbuf, "Failed to create xmlBuffer");

    xmlOutputBufferPtr out = xmlOutputBufferCreateBuffer(xbuf, NULL);
    TEST_ASSERT_NOT_NULL_MESSAGE(out, "Failed to create xmlOutputBuffer");

    test_htmlDtdDumpOutput(out, doc, "utf-8");

    /* Ensure all data is written into the xmlBuffer */
    xmlOutputBufferFlush(out);

    const xmlChar *content = xmlBufferContent(xbuf);
    int len = xmlBufferLength(xbuf);
    if (len < 0) len = 0;

    char *ret = (char *)malloc((size_t)len + 1);
    TEST_ASSERT_NOT_NULL_MESSAGE(ret, "malloc failed");
    if (len > 0 && content != NULL) {
        memcpy(ret, content, (size_t)len);
    }
    ret[len] = '\0';

    xmlOutputBufferClose(out);
    xmlBufferFree(xbuf);

    return ret;
}

void setUp(void) {
    xmlInitParser();
}

void tearDown(void) {
    xmlCleanupParser();
}

static xmlDocPtr make_doc(void) {
    xmlDocPtr doc = xmlNewDoc(BAD_CAST "1.0");
    TEST_ASSERT_NOT_NULL_MESSAGE(doc, "xmlNewDoc failed");
    return doc;
}

void test_htmlDtdDumpOutput_no_subset_outputs_nothing(void) {
    xmlDocPtr doc = make_doc();

    char *out = run_dump_and_get_string(doc);
    TEST_ASSERT_NOT_NULL(out);
    TEST_ASSERT_EQUAL_STRING("", out);

    free(out);
    xmlFreeDoc(doc);
}

void test_htmlDtdDumpOutput_name_only(void) {
    xmlDocPtr doc = make_doc();
    xmlDtdPtr dtd = xmlCreateIntSubset(doc, BAD_CAST "html", NULL, NULL);
    TEST_ASSERT_NOT_NULL_MESSAGE(dtd, "xmlCreateIntSubset failed");

    char *out = run_dump_and_get_string(doc);
    TEST_ASSERT_EQUAL_STRING("<!DOCTYPE html>\n", out);

    free(out);
    xmlFreeDoc(doc);
}

void test_htmlDtdDumpOutput_public_only(void) {
    xmlDocPtr doc = make_doc();
    xmlDtdPtr dtd = xmlCreateIntSubset(doc, BAD_CAST "html",
                                       BAD_CAST "PUBLIC_ID",
                                       NULL);
    TEST_ASSERT_NOT_NULL_MESSAGE(dtd, "xmlCreateIntSubset failed");

    char *out = run_dump_and_get_string(doc);
    TEST_ASSERT_EQUAL_STRING("<!DOCTYPE html PUBLIC \"PUBLIC_ID\">\n", out);

    free(out);
    xmlFreeDoc(doc);
}

void test_htmlDtdDumpOutput_system_only_non_legacy(void) {
    xmlDocPtr doc = make_doc();
    xmlDtdPtr dtd = xmlCreateIntSubset(doc, BAD_CAST "html",
                                       NULL,
                                       BAD_CAST "http://example.com/sys.dtd");
    TEST_ASSERT_NOT_NULL_MESSAGE(dtd, "xmlCreateIntSubset failed");

    char *out = run_dump_and_get_string(doc);
    TEST_ASSERT_EQUAL_STRING("<!DOCTYPE html SYSTEM \"http://example.com/sys.dtd\">\n", out);

    free(out);
    xmlFreeDoc(doc);
}

void test_htmlDtdDumpOutput_system_only_legacy_compat_suppressed(void) {
    xmlDocPtr doc = make_doc();
    xmlDtdPtr dtd = xmlCreateIntSubset(doc, BAD_CAST "html",
                                       NULL,
                                       BAD_CAST "about:legacy-compat");
    TEST_ASSERT_NOT_NULL_MESSAGE(dtd, "xmlCreateIntSubset failed");

    char *out = run_dump_and_get_string(doc);
    /* No SYSTEM printed for about:legacy-compat */
    TEST_ASSERT_EQUAL_STRING("<!DOCTYPE html>\n", out);

    free(out);
    xmlFreeDoc(doc);
}

void test_htmlDtdDumpOutput_public_and_system(void) {
    xmlDocPtr doc = make_doc();
    xmlDtdPtr dtd = xmlCreateIntSubset(doc, BAD_CAST "html",
                                       BAD_CAST "-//W3C//DTD HTML 4.01//EN",
                                       BAD_CAST "http://www.w3.org/TR/html4/strict.dtd");
    TEST_ASSERT_NOT_NULL_MESSAGE(dtd, "xmlCreateIntSubset failed");

    char *out = run_dump_and_get_string(doc);
    TEST_ASSERT_EQUAL_STRING("<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\">\n", out);

    free(out);
    xmlFreeDoc(doc);
}

int main(void) {
    UNITY_BEGIN();

    RUN_TEST(test_htmlDtdDumpOutput_no_subset_outputs_nothing);
    RUN_TEST(test_htmlDtdDumpOutput_name_only);
    RUN_TEST(test_htmlDtdDumpOutput_public_only);
    RUN_TEST(test_htmlDtdDumpOutput_system_only_non_legacy);
    RUN_TEST(test_htmlDtdDumpOutput_system_only_legacy_compat_suppressed);
    RUN_TEST(test_htmlDtdDumpOutput_public_and_system);

    return UNITY_END();
}