#***************************************************************************
#                                  _   _ ____  _
#  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 http://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,
     AC_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
              if $5; then
                 LIBCURL=`$_libcurl_config --static-libs`
                 if test x"$LIBCURL" = "x"; then
                    LIBCURL=`$_libcurl_config --libs`
                 fi
              else
                 LIBCURL=`$_libcurl_config --libs`
              fi

              # 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

           dnl If we are on OS X and we haven't picked up libcurl static or
           dnl otherwise, then let's just go ahead and use the one present on
           dnl the system. Since this compiled binary will only run on OS X
           dnl which almost always has cURL installed, it's OK to add the
           dnl static dependency.
           AS_IF([test "x${LIBCURL}" = "x"],
                [AS_CASE(["$host_os"],
                    [darwin*],
                    [AS_IF([test "x$_libcurl_config" != "x"],
                        AS_VAR_SET(LIBCURL, $($_libcurl_config --libs)),
                        []
                    )],
                    []
                )],
                []
            )

           # 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
