#!/usr/bin/env python

# rather strangely, we need to look for libiconv before checking libc
# as the external libiconv can use a macro to override iconv_open to libiconv_open
# and then we may find the wrong iconv.h later due to other packages looking
# in /usr/local
# We check for the lib iconv when building a shared lib has some compiler/linker
# managed to link when specifying -liconv a executable even if there is no
# libiconv.so or libiconv.a

conf.CHECK_LIB(libs="iconv", shlib=True)

#HP-UX can use libiconv as an add-on package, which has #define iconv_open libiconv_open
if (conf.CHECK_FUNCS_IN('iconv_open', 'iconv', checklibc=False, headers='iconv.h') or
    conf.CHECK_FUNCS_IN('libiconv_open', 'iconv', checklibc=False, headers='iconv.h') or 
    conf.CHECK_FUNCS('iconv_open', headers='iconv.h')):
    
    conf.DEFINE('HAVE_NATIVE_ICONV', 1)

conf.CHECK_CODE('''
                uint8_t inbuf[2] = { 0x30, 0xdf };
                uint8_t outbuf[4] = { 0 };
                char *ptr_in = (char *)inbuf;
                char *ptr_out = (char *)outbuf;
                size_t size_in = sizeof(inbuf);
                size_t size_out = sizeof(outbuf);
                size_t ret;
                iconv_t cd;
                cd = iconv_open("UTF-8", "UTF-16LE");
                if (cd == 0 || cd == (iconv_t)-1) return -1;
                ret = iconv(cd, &ptr_in, &size_in, &ptr_out, &size_out);
                if (ret != (size_t)-1 || errno != EILSEQ) return -1;
                ''',
                define='HAVE_ICONV_ERRNO_ILLEGAL_MULTIBYTE',
                execute=True,
                msg='Checking errno of iconv for illegal multibyte sequence',
                lib='iconv',
                headers='errno.h iconv.h')

if conf.CHECK_CFG(package='icu-i18n',
               args='--cflags --libs',
               msg='Checking for icu-i18n',
               uselib_store='ICU_I18N'):
    for lib in conf.env['LIB_ICU_I18N']:
        conf.CHECK_LIB(lib, shlib=True, mandatory=True)
    conf.env['icu-libs'] = ' '.join(conf.env['LIB_ICU_I18N'])
    if not conf.CHECK_HEADERS('unicode/ustring.h'):
        conf.fatal('Found libicu, but unicode/ustring.h is missing')
    conf.DEFINE('HAVE_UTF8_NORMALISATION', 1)
else:
    conf.env['icu-libs'] = ''