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       curl_version_info - returns run-time libcurl version info


       #include <curl/curl.h>

       curl_version_info_data *curl_version_info( CURLversion type);


       Returns  a pointer to a filled in struct with information about various
       run-time features in libcurl. type should be set to the version of this
       functionality  by  the  time  you write your program. This way, libcurl
       will always return a proper struct that your program understands, while
       programs  in  the  future might get a different struct. CURLVERSION_NOW
       will be the most recent one for the library you have installed:

               data = curl_version_info(CURLVERSION_NOW);

       Applications should  use  this  information  to  judge  if  things  are
       possible  to  do  or  not,  instead  of  using  compile-time checks, as
       dynamic/DLL libraries can be changed independent of applications.

       The curl_version_info_data struct looks like this

       typedef struct {
         CURLversion age;          /* see description below */

         /* when ’age’ is 0 or higher, the members below also exist: */
         const char *version;      /* human readable string */
         unsigned int version_num; /* numeric representation */
         const char *host;         /* human readable string */
         int features;             /* bitmask, see below */
         char *ssl_version;        /* human readable string */
         long ssl_version_num;     /* not used, always zero */
         const char *libz_version; /* human readable string */
         const char **protocols;   /* list of protocols */

         /* when ’age’ is 1 or higher, the members below also exist: */
         const char *ares;         /* human readable string */
         int ares_num;             /* number */

         /* when ’age’ is 2 or higher, the member below also exists: */
         const char *libidn;       /* human readable string */

         /* when ’age’ is 3 or higher, the members below also exist: */
         int iconv_ver_num;       /* ’_libiconv_version’ if iconv support enabled */

         const char *libssh_version; /* human readable string */

       } curl_version_info_data;

       age describes what the age of this struct is. The number depends on how
       new  the  libcurl  you’re using is. You are however guaranteed to get a
       struct that you have a matching struct for in the header, as  you  tell
       libcurl your "age" with the input argument.

       version is just an ascii string for the libcurl version.

       version_num is a 24 bit number created like this: <8 bits major number>
       | <8 bits minor number> | <8  bits  patch  number>.  Version  7.9.8  is
       therefore returned as 0x070908.

       host is an ascii string showing what host information that this libcurl
       was built for. As discovered by a configure script or set by the  build

       features can have none, one or more bits set, and the currently defined
       bits are:

                     supports IPv6

                     supports kerberos4 (when using FTP)

                     supports SSL (HTTPS/FTPS) (Added in 7.10)

                     supports HTTP deflate using libz (Added in 7.10)

                     supports HTTP NTLM (added in 7.10.6)

                     supports HTTP GSS-Negotiate (added in 7.10.6)

                     libcurl was  built  with  debug  capabilities  (added  in

                     libcurl    was   built   with   memory   tracking   debug
                     capabilities. This is  mainly  of  interest  for  libcurl
                     hackers. (added in 7.19.6)

                     libcurl  was  built  with  support  for asynchronous name
                     lookups,  which  allows  more  exact  timeouts  (even  on
                     Windows)   and   less   blocking  when  using  the  multi
                     interface. (added in 7.10.7)

                     libcurl was built with support for SPNEGO  authentication
                     (Simple  and  Protected  GSS-API  Negotiation  Mechanism,
                     defined in RFC 2478.) (added in 7.10.8)

                     libcurl was built with support for large files. (Added in

                     libcurl  was  built  with  support for IDNA, domain names
                     with international letters. (Added in 7.12.0)

                     libcurl was built with support for  SSPI.  This  is  only
                     available  on  Windows  and  makes  libcurl  use Windows-
                     provided  functions  for  NTLM  authentication.  It  also
                     allows  libcurl  to  use the current user and the current
                     user’s password without the app having to pass  them  on.
                     (Added in 7.13.2)

                     libcurl was built with support for character conversions,
                     as provided by the CURLOPT_CONV_*  callbacks.  (Added  in
       ssl_version is an ASCII string for the OpenSSL version used. If libcurl
       has no SSL support, this is NULL.

       ssl_version_num is the numerical OpenSSL version value  as  defined  by
       the OpenSSL project. If libcurl has no SSL support, this is 0.

       libz_version  is  an  ASCII  string (there is no numerical version). If
       libcurl has no libz support, this is NULL.

       protocols is a pointer to an array of char * pointers,  containing  the
       names  protocols  that  libcurl supports (using lowercase letters). The
       protocol names are the same as would be used  in  URLs.  The  array  is
       terminated by a NULL entry.


       A pointer to a curl_version_info_data struct.