#***************************************************************************

#                                  _   _ ____  _

#  Project                     ___| | | |  _ \| |

#                             / __| | | | |_) | |

#                            | (__| |_| |  _ <| |___

#                             \___|\___/|_| \_\_____|

#

# Copyright (C) 2006, David Shaw <dshaw@jabberwocky.com>

#

# This software is licensed as described in the file COPYING, which

# you should have received as part of this distribution. The terms

# are also available at https://curl.haxx.se/docs/copyright.html.

#

# You may opt to use, copy, modify, merge, publish, distribute and/or sell

# copies of the Software, and permit persons to whom the Software is

# furnished to do so, under the terms of the COPYING file.

#

# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY

# KIND, either express or implied.

#

###########################################################################

# LIBCURL_CHECK_CONFIG ([DEFAULT-ACTION], [MINIMUM-VERSION],

#                       [ACTION-IF-YES], [ACTION-IF-NO])

# ----------------------------------------------------------

#      David Shaw <dshaw@jabberwocky.com>   May-09-2006

#

# Checks for libcurl.  DEFAULT-ACTION is the string yes or no to

# specify whether to default to --with-libcurl or --without-libcurl.

# If not supplied, DEFAULT-ACTION is yes.  MINIMUM-VERSION is the

# minimum version of libcurl to accept.  Pass the version as a regular

# version number like 7.10.1. If not supplied, any version is

# accepted.  ACTION-IF-YES is a list of shell commands to run if

# libcurl was successfully found and passed the various tests.

# ACTION-IF-NO is a list of shell commands that are run otherwise.

# Note that using --without-libcurl does run ACTION-IF-NO.

#

# This macro #defines HAVE_LIBCURL if a working libcurl setup is

# found, and sets @LIBCURL@ and @LIBCURL_CPPFLAGS@ to the necessary

# values.  Other useful defines are LIBCURL_FEATURE_xxx where xxx are

# the various features supported by libcurl, and LIBCURL_PROTOCOL_yyy

# where yyy are the various protocols supported by libcurl.  Both xxx

# and yyy are capitalized.  See the list of AH_TEMPLATEs at the top of

# the macro for the complete list of possible defines.  Shell

# variables $libcurl_feature_xxx and $libcurl_protocol_yyy are also

# defined to 'yes' for those features and protocols that were found.

# Note that xxx and yyy keep the same capitalization as in the

# curl-config list (e.g. it's "HTTP" and not "http").

#

# Users may override the detected values by doing something like:

# LIBCURL="-lcurl" LIBCURL_CPPFLAGS="-I/usr/myinclude" ./configure

#

# For the sake of sanity, this macro assumes that any libcurl that is

# found is after version 7.7.2, the first version that included the

# curl-config script.  Note that it is very important for people

# packaging binary versions of libcurl to include this script!

# Without curl-config, we can only guess what protocols are available,

# or use curl_version_info to figure it out at runtime.

AC_DEFUN([LIBCURL_CHECK_CONFIG],

[

  AH_TEMPLATE([LIBCURL_FEATURE_SSL],[Defined if libcurl supports SSL])

  AH_TEMPLATE([LIBCURL_FEATURE_KRB4],[Defined if libcurl supports KRB4])

  AH_TEMPLATE([LIBCURL_FEATURE_IPV6],[Defined if libcurl supports IPv6])

  AH_TEMPLATE([LIBCURL_FEATURE_LIBZ],[Defined if libcurl supports libz])

  AH_TEMPLATE([LIBCURL_FEATURE_ASYNCHDNS],[Defined if libcurl supports AsynchDNS])

  AH_TEMPLATE([LIBCURL_FEATURE_IDN],[Defined if libcurl supports IDN])

  AH_TEMPLATE([LIBCURL_FEATURE_SSPI],[Defined if libcurl supports SSPI])

  AH_TEMPLATE([LIBCURL_FEATURE_NTLM],[Defined if libcurl supports NTLM])

  AH_TEMPLATE([LIBCURL_PROTOCOL_HTTP],[Defined if libcurl supports HTTP])

  AH_TEMPLATE([LIBCURL_PROTOCOL_HTTPS],[Defined if libcurl supports HTTPS])

  AH_TEMPLATE([LIBCURL_PROTOCOL_FTP],[Defined if libcurl supports FTP])

  AH_TEMPLATE([LIBCURL_PROTOCOL_FTPS],[Defined if libcurl supports FTPS])

  AH_TEMPLATE([LIBCURL_PROTOCOL_FILE],[Defined if libcurl supports FILE])

  AH_TEMPLATE([LIBCURL_PROTOCOL_TELNET],[Defined if libcurl supports TELNET])

  AH_TEMPLATE([LIBCURL_PROTOCOL_LDAP],[Defined if libcurl supports LDAP])

  AH_TEMPLATE([LIBCURL_PROTOCOL_DICT],[Defined if libcurl supports DICT])

  AH_TEMPLATE([LIBCURL_PROTOCOL_TFTP],[Defined if libcurl supports TFTP])

  AH_TEMPLATE([LIBCURL_PROTOCOL_RTSP],[Defined if libcurl supports RTSP])

  AH_TEMPLATE([LIBCURL_PROTOCOL_POP3],[Defined if libcurl supports POP3])

  AH_TEMPLATE([LIBCURL_PROTOCOL_IMAP],[Defined if libcurl supports IMAP])

  AH_TEMPLATE([LIBCURL_PROTOCOL_SMTP],[Defined if libcurl supports SMTP])

  AC_ARG_WITH(libcurl,

     AS_HELP_STRING([--with-libcurl=PREFIX],[look for the curl library in PREFIX/lib and headers in PREFIX/include]),

     [_libcurl_with=$withval],[_libcurl_with=ifelse([$1],,[yes],[$1])])

  if test "$_libcurl_with" != "no" ; then

     AC_PROG_AWK

     _libcurl_version_parse="eval $AWK '{split(\$NF,A,\".\"); X=256*256*A[[1]]+256*A[[2]]+A[[3]]; print X;}'"

     _libcurl_try_link=yes

     if test -d "$_libcurl_with" ; then

        LIBCURL_CPPFLAGS="-I$withval/include"

        _libcurl_ldflags="-L$withval/lib"

        AC_PATH_PROG([_libcurl_config],[curl-config],[],

                     ["$withval/bin"])

     else

        AC_PATH_PROG([_libcurl_config],[curl-config],[],[$PATH])

     fi

     if test x$_libcurl_config != "x" ; then

        AC_CACHE_CHECK([for the version of libcurl],

           [libcurl_cv_lib_curl_version],

           [libcurl_cv_lib_curl_version=`$_libcurl_config --version | $AWK '{print $[]2}'`])

        _libcurl_version=`echo $libcurl_cv_lib_curl_version | $_libcurl_version_parse`

        _libcurl_wanted=`echo ifelse([$2],,[0],[$2]) | $_libcurl_version_parse`

        if test $_libcurl_wanted -gt 0 ; then

           AC_CACHE_CHECK([for libcurl >= version $2],

              [libcurl_cv_lib_version_ok],

              [

              if test $_libcurl_version -ge $_libcurl_wanted ; then

                 libcurl_cv_lib_version_ok=yes

              else

                 libcurl_cv_lib_version_ok=no

              fi

              ])

        fi

        if test $_libcurl_wanted -eq 0 || test x$libcurl_cv_lib_version_ok = xyes ; then

           if test x"$LIBCURL_CPPFLAGS" = "x" ; then

              LIBCURL_CPPFLAGS=`$_libcurl_config --cflags`

           fi

           if test x"$LIBCURL" = "x" ; then

              LIBCURL=`$_libcurl_config --libs`

              # This is so silly, but Apple actually has a bug in their

              # curl-config script.  Fixed in Tiger, but there are still

              # lots of Panther installs around.

              case "${host}" in

                 powerpc-apple-darwin7*)

                    LIBCURL=`echo $LIBCURL | sed -e 's|-arch i386||g'`

                 ;;

              esac

           fi

           # All curl-config scripts support --feature

           _libcurl_features=`$_libcurl_config --feature`

           # Is it modern enough to have --protocols? (7.12.4)

           if test $_libcurl_version -ge 461828 ; then

              _libcurl_protocols=`$_libcurl_config --protocols`

           fi

        else

           _libcurl_try_link=no

        fi

        unset _libcurl_wanted

     fi

     if test $_libcurl_try_link = yes ; then

        # we didn't find curl-config, so let's see if the user-supplied

        # link line (or failing that, "-lcurl") is enough.

        LIBCURL=${LIBCURL-"$_libcurl_ldflags -lcurl"}

        AC_CACHE_CHECK([whether libcurl is usable],

           [libcurl_cv_lib_curl_usable],

           [

           _libcurl_save_cppflags=$CPPFLAGS

           CPPFLAGS="$LIBCURL_CPPFLAGS $CPPFLAGS"

           _libcurl_save_libs=$LIBS

           LIBS="$LIBCURL $LIBS"

           AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <curl/curl.h>]],[[

/* Try and use a few common options to force a failure if we are

   missing symbols or can't link. */

int x;

curl_easy_setopt(NULL,CURLOPT_URL,NULL);

x=CURL_ERROR_SIZE;

x=CURLOPT_WRITEFUNCTION;

x=CURLOPT_WRITEDATA;

x=CURLOPT_ERRORBUFFER;

x=CURLOPT_STDERR;

x=CURLOPT_VERBOSE;

if (x) {;}

]])],libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)

           CPPFLAGS=$_libcurl_save_cppflags

           LIBS=$_libcurl_save_libs

           unset _libcurl_save_cppflags

           unset _libcurl_save_libs

           ])

        if test $libcurl_cv_lib_curl_usable = yes ; then

           # Does curl_free() exist in this version of libcurl?

           # If not, fake it with free()

           _libcurl_save_cppflags=$CPPFLAGS

           CPPFLAGS="$CPPFLAGS $LIBCURL_CPPFLAGS"

           _libcurl_save_libs=$LIBS

           LIBS="$LIBS $LIBCURL"

           AC_CHECK_FUNC(curl_free,,

              AC_DEFINE(curl_free,free,

                [Define curl_free() as free() if our version of curl lacks curl_free.]))

           CPPFLAGS=$_libcurl_save_cppflags

           LIBS=$_libcurl_save_libs

           unset _libcurl_save_cppflags

           unset _libcurl_save_libs

           AC_DEFINE(HAVE_LIBCURL,1,

             [Define to 1 if you have a functional curl library.])

           AC_SUBST(LIBCURL_CPPFLAGS)

           AC_SUBST(LIBCURL)

           for _libcurl_feature in $_libcurl_features ; do

              AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_feature_$_libcurl_feature),[1])

              eval AS_TR_SH(libcurl_feature_$_libcurl_feature)=yes

           done

           if test "x$_libcurl_protocols" = "x" ; then

              # We don't have --protocols, so just assume that all

              # protocols are available

              _libcurl_protocols="HTTP FTP FILE TELNET LDAP DICT TFTP"

              if test x$libcurl_feature_SSL = xyes ; then

                 _libcurl_protocols="$_libcurl_protocols HTTPS"

                 # FTPS wasn't standards-compliant until version

                 # 7.11.0 (0x070b00 == 461568)

                 if test $_libcurl_version -ge 461568; then

                    _libcurl_protocols="$_libcurl_protocols FTPS"

                 fi

              fi

              # RTSP, IMAP, POP3 and SMTP were added in

              # 7.20.0 (0x071400 == 463872)

              if test $_libcurl_version -ge 463872; then

                 _libcurl_protocols="$_libcurl_protocols RTSP IMAP POP3 SMTP"

              fi

           fi

           for _libcurl_protocol in $_libcurl_protocols ; do

              AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_protocol_$_libcurl_protocol),[1])

              eval AS_TR_SH(libcurl_protocol_$_libcurl_protocol)=yes

           done

        else

           unset LIBCURL

           unset LIBCURL_CPPFLAGS

        fi

     fi

     unset _libcurl_try_link

     unset _libcurl_version_parse

     unset _libcurl_config

     unset _libcurl_feature

     unset _libcurl_features

     unset _libcurl_protocol

     unset _libcurl_protocols

     unset _libcurl_version

     unset _libcurl_ldflags

  fi

  if test x$_libcurl_with = xno || test x$libcurl_cv_lib_curl_usable != xyes ; then

     # This is the IF-NO path

     ifelse([$4],,:,[$4])

  else

     # This is the IF-YES path

     ifelse([$3],,:,[$3])

  fi

  unset _libcurl_with

])dnl