xml - libxml

xml - libxml

http://xmlsoft.org/

설치

$ sudo apt install libxml2-dev

sample code

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libxml/parser.h>


static void s_print_attributes(xmlNode * node)
{
    xmlAttr * props = node->properties;
    xmlNode * attr;
    if (props == NULL) {
        return;
    }
    printf("{");
    for (; props; props = props->next) {
        if (props->prev) {
            printf(" ");
        }
        printf("%s: %s", props->name, props->xmlChildrenNode->content);
    }
    printf("}");
}


static void s_print_first_child(xmlNode * node, const char * prefix)
{
    xmlNode * first = node->xmlChildrenNode;
    if (!first || first->next) {
        return;
    }

    printf("%s", prefix);
    printf("Content: '%s'\n", first->content);
}

static void s_print_child_elements(xmlNode * node, const char * prefix)
{
    xmlNode * child;
    for (child = node->xmlChildrenNode; child; child = child->next) {
        if (child->type == XML_ELEMENT_NODE) {
            char prefix_[10] = {0,};
            snprintf(prefix_, sizeof(prefix_), "  %s", prefix);
            printf("%s", prefix);
            printf("Name: %s ", child->name);
            s_print_attributes(child);
            printf("\n");
            s_print_first_child(child, prefix_);
            s_print_child_elements(child, prefix_);
        }
    }
}


int main(int argc, char *argv[])
{
    LIBXML_TEST_VERSION
    xmlDoc * doc;
    xmlNode * root;
    xmlNode * cur_node = NULL;

    if (argc < 2) {
        fprintf(stderr, "usage: %s <xml path>\n", argv[0]);
        exit(1);
    }
   
    doc = xmlReadFile(argv[1], NULL, 0);
    if (doc == NULL) {
        fprintf(stderr, "xmlReadFile() failed\n");
        exit(1);
    }

    root = xmlDocGetRootElement(doc);
    s_print_child_elements(root, "");
   
    xmlFreeDoc(doc);
    xmlCleanupParser();
    xmlMemoryDump();
    return 0;
}

빌드

$ gcc -o parse main.c `pkg-config --cflags --libs libxml-2.0`

light.xml

<?xml version="1.0"?>
<root xmlns="urn:schemas-upnp-org:device-1-0">
  <specVersion>
    <major>1</major>
    <minor>0</minor>
  </specVersion>
  <device>
    <deviceType>urn:schemas-upnp-org:device:BinaryLight:0.9</deviceType>
    <friendlyName>Living Room</friendlyName>
    <manufacturer>My company</manufacturer>
    <manufacturerURL>URL to manufacturer site</manufacturerURL>
    <modelDescription>Remote Light Control</modelDescription>
    <modelName>Light</modelName>
    <modelNumber>0001</modelNumber>
    <modelURL>URL to model site</modelURL>
    <serialNumber>SN0001</serialNumber>
    <UDN>uuid:UUID</UDN>
    <serviceList>
      <service>
        <serviceType>urn:schemas-upnp-org:service:SwitchPower:1</serviceType>
        <serviceId>urn:upnp-org:serviceId:SwitchPower:1</serviceId>
        <SCPDURL>/switchpower.xml</SCPDURL>
        <controlURL>URL for control</controlURL>
        <eventSubURL>URL for eventing</eventSubURL>
      </service>
    </serviceList>
  </device>
</root>

실행

$ ./parse light.xml
Name: specVersion
  Name: major
    Content: '1'
  Name: minor
    Content: '0'
Name: device
  Name: deviceType
    Content: 'urn:schemas-upnp-org:device:BinaryLight:0.9'
  Name: friendlyName
    Content: 'Living Room'
  Name: manufacturer
    Content: 'My company'
  Name: manufacturerURL
    Content: 'URL to manufacturer site'
  Name: modelDescription
    Content: 'Remote Light Control'
  Name: modelName
    Content: 'Light'
  Name: modelNumber
    Content: '0001'
  Name: modelURL
    Content: 'URL to model site'
  Name: serialNumber
    Content: 'SN0001'
  Name: UDN
    Content: 'uuid:UUID'
  Name: serviceList
    Name: service
      Name: serviceType
        Content: 'urn:schemas-upnp-org:service:SwitchPower:1'
      Name: serviceId
        Content: 'urn:upnp-org:serviceId:SwitchPower:1'
      Name: SCPDURL
        Content: '/switchpower.xml'
      Name: controlURL
        Content: 'URL for control'
      Name: eventSubURL
        Content: 'URL for eventing'

switchpower.xml

<?xml version="1.0"?>
<scpd xmlns="urn:schemas-upnp-org:service-1-0">
  <specVersion>
    <major>1</major>
    <minor>0</minor>
  </specVersion>
  <actionList>
    <action>
      <name>SetTarget</name>
      <argumentList>
        <argument>
          <name>newTargetValue</name>
          <relatedStateVariable>Target</relatedStateVariable>
          <direction>in</direction>
        </argument>
      </argumentList>
    </action>
    <action>
      <name>GetTarget</name>
      <argumentList>
        <argument>
          <name>RetTargetValue</name>
          <relatedStateVariable>Target</relatedStateVariable>
          <direction>out</direction>
        </argument>
      </argumentList>
    </action>
    <action>
      <name>GetStatus</name>
      <argumentList>
        <argument>
          <name>ResultStatus</name>
          <relatedStateVariable>Status</relatedStateVariable>
          <direction>out</direction>
        </argument>
      </argumentList>
    </action>
  </actionList>
  <serviceStateTable>
    <stateVariable sendEvents="no">
      <name>Target</name>
      <dataType>boolean</dataType>
      <defaultValue>0</defaultValue>
    </stateVariable>
    <stateVariable sendEvents="yes">
      <name>Status</name>
      <dataType>boolean</dataType>
      <defaultValue>0</defaultValue>
    </stateVariable>
  </serviceStateTable>
</scpd>

실행

$ ./parse switchpower.xml
Name: specVersion
  Name: major
    Content: '1'
  Name: minor
    Content: '0'
Name: actionList
  Name: action
    Name: name
      Content: 'SetTarget'
    Name: argumentList
      Name: argument
        Name: name
         Content: 'newTargetValue'
        Name: relatedStateVariable
         Content: 'Target'
        Name: direction
         Content: 'in'
  Name: action
    Name: name
      Content: 'GetTarget'
    Name: argumentList
      Name: argument
        Name: name
         Content: 'RetTargetValue'
        Name: relatedStateVariable
         Content: 'Target'
        Name: direction
         Content: 'out'
  Name: action
    Name: name
      Content: 'GetStatus'
    Name: argumentList
      Name: argument
        Name: name
         Content: 'ResultStatus'
        Name: relatedStateVariable
         Content: 'Status'
        Name: direction
         Content: 'out'
Name: serviceStateTable
  Name: stateVariable {sendEvents: no}
    Name: name
      Content: 'Target'
    Name: dataType
      Content: 'boolean'
    Name: defaultValue
      Content: '0'
  Name: stateVariable {sendEvents: yes}
    Name: name
      Content: 'Status'
    Name: dataType
      Content: 'boolean'
    Name: defaultValue
      Content: '0'