int main ( int argc, char *argv[] )
{
char *env_var[24] =
{
"COMSPEC",
"DOCUMENT_ROOT",
"GATEWAY_INTERFACE",
"HTTP_ACCEPT",
"HTTP_ACCEPT_ENCODING",
"HTTP_ACCEPT_LANGUAGE",
"HTTP_CONNECTION",
"HTTP_HOST",
"HTTP_USER_AGENT",
"PATH",
"QUERY_STRING",
"REMOTE_ADDR",
"REMOTE_PORT",
"REQUEST_METHOD",
"REQUEST_URI",
"SCRIPT_FILENAME",
"SCRIPT_NAME",
"SERVER_ADDR",
"SERVER_ADMIN",
"SERVER_NAME",
"SERVER_PORT",
"SERVER_PROTOCOL",
"SERVER_SIGNATURE",
"SERVER_SOFTWARE"
};
printf ("%s\n","Content-Type: text/html\n" );
printf ( "%s\n","<?xmlversion = \"1.0\"?>" );
printf ("%s\n","<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML1.1//EN\" " );
printf ("%s\n","\"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">");
printf ( "%s\n","<htmlxmlns = \"http://www.w3.org/1999/xhtml\">" );
printf ("%s\n","<head><title>CGI环境变量</title></head><body>" );
printf ( "%s\n","<tableborder = \"0\" cellspacing = \"2\">" );
for( int i=0;i<24;i++ )
{
printf ("%s%s%s\n","<tr><td>",env_var[i],"</td><td>");
char *value = getenv( env_var[i]);
if ( value )
{
printf ( "%s",value );
}
else
{
printf ( "%s","CGI环境变量不存在." );
}
printf ("%s\n","</td></tr>" );
}
printf ("%s\n","</table></body></html>" );
printf ( "%s\n","C语言编写" );
return EXIT_SUCCESS;
}