how to get the keys of a xmlHashTable ? (libxml2)

Question

I am using the library libxml2 to parse an XML document. And then I saw xmlHashTable in this library. Is it possible to get all the keys of a xmlHashTable? I want to store all the keys in an array.

The XML document is:

<?xml version="1.0" encoding="UTF-8"?>

<?type-proto key="MIPRegistrationRequest" value="mip" ?>
<?avp-proto key="Example-AVP" value="data" ?>

<!DOCTYPE dictionary SYSTEM "dictionary.dtd" [
    <!-- Any files added here need to be added to Makefile.am and
         packaging/nsis/wireshark.nsi -->

    <!ENTITY nasreq         SYSTEM "nasreq.xml">
    <!ENTITY eap            SYSTEM "eap.xml">
    <!ENTITY mobileipv4     SYSTEM "mobileipv4.xml">
    <!ENTITY chargecontrol      SYSTEM "chargecontrol.xml">
    <!ENTITY sunping        SYSTEM "sunping.xml">
    <!ENTITY TGPP           SYSTEM "TGPP.xml">
    <!ENTITY TGPP2          SYSTEM "TGPP2.xml">
    <!ENTITY sip            SYSTEM "sip.xml">
    <!ENTITY etsie2e4       SYSTEM "etsie2e4.xml">
    <!ENTITY Ericsson       SYSTEM "Ericsson.xml">
    <!ENTITY mobileipv6     SYSTEM "mobileipv6.xml">
    <!ENTITY Cisco          SYSTEM "Cisco.xml">
    <!ENTITY Starent        SYSTEM "Starent.xml">
    <!ENTITY Vodafone       SYSTEM "Vodafone.xml">
    <!ENTITY AlcatelLucent      SYSTEM "AlcatelLucent.xml">
    <!ENTITY Nokia          SYSTEM "Nokia.xml">
    <!ENTITY NokiaSolutionsAndNetworks  SYSTEM "NokiaSolutionsAndNetworks.xml">
    <!ENTITY HP         SYSTEM "HP.xml">
    <!ENTITY Oracle         SYSTEM "Oracle.xml">
    <!ENTITY Custom         SYSTEM "Custom.xml">
]>
<dictionary>
...
<dictionary>

I am trying to get the all the keys of the external (parsed) entities (such as nasreq, eap etc):

ddict_t *ddict_scan(const char* system_directory, const char* filename) 
{

    char *path = g_strconcat((const gchar*) system_directory, (const gchar*)filename, (const gchar *)'\0');
    xmlDocPtr p1 = getdoc((const char *)path);
    xmlEntitiesTablePtr ptr2 = p1->intSubset->entities;
    //to be added
}

The type of xmlEntitiesTable is a xmlHashTable.

Answer 1

There is the xmlHashScan() function (and its pickier relatives), which can be used to have a user-provided xmlHashScanner function called back by the library for each entry in the xmlHashTable. The xmlHashScanner is given the name of each entry as parameter, so it should be easy to assemble a list of all the keys that way.