FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/config/iconv.m4

     # iconv.m4 serial 21
     dnl Copyright (C) 2000-2002, 2007-2014, 2016-2019 Free Software Foundation,
     dnl Inc.
     dnl This file is free software; the Free Software Foundation
     dnl gives unlimited permission to copy and/or distribute it,
     dnl with or without modifications, as long as this notice is preserved.
     
     dnl From Bruno Haible.
     
    AC_DEFUN([AM_ICONV_LINKFLAGS_BODY],
    [
      dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
      AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
      AC_REQUIRE([AC_LIB_RPATH])
    
      dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
      dnl accordingly.
      AC_LIB_LINKFLAGS_BODY([iconv])
    ])
    
    AC_DEFUN([AM_ICONV_LINK],
    [
      dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
      dnl those with the standalone portable GNU libiconv installed).
      AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
    
      dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
      dnl accordingly.
      AC_REQUIRE([AM_ICONV_LINKFLAGS_BODY])
    
      dnl Add $INCICONV to CPPFLAGS before performing the following checks,
      dnl so that if libiconv is installed, it will be used (unless disabled
      dnl via --without-libiconv-prefix).  The first AC_LINK_IFELSE will
      dnl then fail, the second AC_LINK_IFELSE will succeed.
      am_save_CPPFLAGS="$CPPFLAGS"
      AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
    
      AC_CACHE_CHECK([for iconv], [am_cv_func_iconv], [
        am_cv_func_iconv="no, consider installing GNU libiconv"
        am_cv_lib_iconv=no
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[
    #include <stdlib.h>
    #include <iconv.h>
             ]],
             [[iconv_t cd = iconv_open("","");
               iconv(cd,NULL,NULL,NULL,NULL);
               iconv_close(cd);]])],
          [am_cv_func_iconv=yes])
        if test "$am_cv_func_iconv" != yes; then
          am_save_LIBS="$LIBS"
          LIBS="$LIBS $LIBICONV"
          AC_LINK_IFELSE(
            [AC_LANG_PROGRAM(
               [[
    #include <stdlib.h>
    #include <iconv.h>
               ]],
               [[iconv_t cd = iconv_open("","");
                 iconv(cd,NULL,NULL,NULL,NULL);
                 iconv_close(cd);]])],
            [am_cv_lib_iconv=yes]
            [am_cv_func_iconv=yes])
          LIBS="$am_save_LIBS"
        fi
      ])
      if test "$am_cv_func_iconv" = yes; then
        AC_CACHE_CHECK([for working iconv], [am_cv_func_iconv_works], [
          dnl This tests against bugs in AIX 5.1, AIX 6.1..7.1, HP-UX 11.11,
          dnl Solaris 10.
          am_save_LIBS="$LIBS"
          if test $am_cv_lib_iconv = yes; then
            LIBS="$LIBS $LIBICONV"
          fi
          am_cv_func_iconv_works=no
          for ac_iconv_const in '' 'const'; do
            AC_RUN_IFELSE(
              [AC_LANG_PROGRAM(
                 [[
    #include <iconv.h>
    #include <string.h>
    
    #ifndef ICONV_CONST
    # define ICONV_CONST $ac_iconv_const
    #endif
                 ]],
                 [[int result = 0;
      /* Test against AIX 5.1 bug: Failures are not distinguishable from successful
         returns.  */
      {
        iconv_t cd_utf8_to_88591 = iconv_open ("ISO8859-1", "UTF-8");
        if (cd_utf8_to_88591 != (iconv_t)(-1))
          {
            static ICONV_CONST char input[] = "\342\202\254"; /* EURO SIGN */
            char buf[10];
            ICONV_CONST char *inptr = input;
            size_t inbytesleft = strlen (input);
            char *outptr = buf;
           size_t outbytesleft = sizeof (buf);
           size_t res = iconv (cd_utf8_to_88591,
                               &inptr, &inbytesleft,
                               &outptr, &outbytesleft);
           if (res == 0)
             result |= 1;
           iconv_close (cd_utf8_to_88591);
         }
     }
     /* Test against Solaris 10 bug: Failures are not distinguishable from
        successful returns.  */
     {
       iconv_t cd_ascii_to_88591 = iconv_open ("ISO8859-1", "646");
       if (cd_ascii_to_88591 != (iconv_t)(-1))
         {
           static ICONV_CONST char input[] = "\263";
           char buf[10];
           ICONV_CONST char *inptr = input;
           size_t inbytesleft = strlen (input);
           char *outptr = buf;
           size_t outbytesleft = sizeof (buf);
           size_t res = iconv (cd_ascii_to_88591,
                               &inptr, &inbytesleft,
                               &outptr, &outbytesleft);
           if (res == 0)
             result |= 2;
           iconv_close (cd_ascii_to_88591);
         }
     }
     /* Test against AIX 6.1..7.1 bug: Buffer overrun.  */
     {
       iconv_t cd_88591_to_utf8 = iconv_open ("UTF-8", "ISO-8859-1");
       if (cd_88591_to_utf8 != (iconv_t)(-1))
         {
           static ICONV_CONST char input[] = "\304";
           static char buf[2] = { (char)0xDE, (char)0xAD };
           ICONV_CONST char *inptr = input;
           size_t inbytesleft = 1;
           char *outptr = buf;
           size_t outbytesleft = 1;
           size_t res = iconv (cd_88591_to_utf8,
                               &inptr, &inbytesleft,
                               &outptr, &outbytesleft);
           if (res != (size_t)(-1) || outptr - buf > 1 || buf[1] != (char)0xAD)
             result |= 4;
           iconv_close (cd_88591_to_utf8);
         }
     }
   #if 0 /* This bug could be worked around by the caller.  */
     /* Test against HP-UX 11.11 bug: Positive return value instead of 0.  */
     {
       iconv_t cd_88591_to_utf8 = iconv_open ("utf8", "iso88591");
       if (cd_88591_to_utf8 != (iconv_t)(-1))
         {
           static ICONV_CONST char input[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337";
           char buf[50];
           ICONV_CONST char *inptr = input;
           size_t inbytesleft = strlen (input);
           char *outptr = buf;
           size_t outbytesleft = sizeof (buf);
           size_t res = iconv (cd_88591_to_utf8,
                               &inptr, &inbytesleft,
                               &outptr, &outbytesleft);
           if ((int)res > 0)
             result |= 8;
           iconv_close (cd_88591_to_utf8);
         }
     }
   #endif
     /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is
        provided.  */
     {
       /* Try standardized names.  */
       iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP");
       /* Try IRIX, OSF/1 names.  */
       iconv_t cd2 = iconv_open ("UTF-8", "eucJP");
       /* Try AIX names.  */
       iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP");
       /* Try HP-UX names.  */
       iconv_t cd4 = iconv_open ("utf8", "eucJP");
       if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1)
           && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1))
         result |= 16;
       if (cd1 != (iconv_t)(-1))
         iconv_close (cd1);
       if (cd2 != (iconv_t)(-1))
         iconv_close (cd2);
       if (cd3 != (iconv_t)(-1))
         iconv_close (cd3);
       if (cd4 != (iconv_t)(-1))
         iconv_close (cd4);
     }
     return result;
   ]])],
             [am_cv_func_iconv_works=yes], ,
             [case "$host_os" in
                aix* | hpux*) am_cv_func_iconv_works="guessing no" ;;
                *)            am_cv_func_iconv_works="guessing yes" ;;
              esac])
           test "$am_cv_func_iconv_works" = no || break
         done
         LIBS="$am_save_LIBS"
       ])
       case "$am_cv_func_iconv_works" in
         *no) am_func_iconv=no am_cv_lib_iconv=no ;;
         *)   am_func_iconv=yes ;;
       esac
     else
       am_func_iconv=no am_cv_lib_iconv=no
     fi
     if test "$am_func_iconv" = yes; then
       AC_DEFINE([HAVE_ICONV], [1],
         [Define if you have the iconv() function and it works.])
     fi
     if test "$am_cv_lib_iconv" = yes; then
       AC_MSG_CHECKING([how to link with libiconv])
       AC_MSG_RESULT([$LIBICONV])
     else
       dnl If $LIBICONV didn't lead to a usable library, we don't need $INCICONV
       dnl either.
       CPPFLAGS="$am_save_CPPFLAGS"
       LIBICONV=
       LTLIBICONV=
     fi
     AC_SUBST([LIBICONV])
     AC_SUBST([LTLIBICONV])
   ])
   
   dnl Define AM_ICONV using AC_DEFUN_ONCE for Autoconf >= 2.64, in order to
   dnl avoid warnings like
   dnl "warning: AC_REQUIRE: `AM_ICONV' was expanded before it was required".
   dnl This is tricky because of the way 'aclocal' is implemented:
   dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
   dnl   Otherwise aclocal's initial scan pass would miss the macro definition.
   dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
   dnl   Otherwise aclocal would emit many "Use of uninitialized value $1"
   dnl   warnings.
   m4_define([gl_iconv_AC_DEFUN],
     m4_version_prereq([2.64],
       [[AC_DEFUN_ONCE(
           [$1], [$2])]],
       [m4_ifdef([gl_00GNULIB],
          [[AC_DEFUN_ONCE(
              [$1], [$2])]],
          [[AC_DEFUN(
              [$1], [$2])]])]))
   gl_iconv_AC_DEFUN([AM_ICONV],
   [
     AM_ICONV_LINK
     if test "$am_cv_func_iconv" = yes; then
       AC_MSG_CHECKING([for iconv declaration])
       AC_CACHE_VAL([am_cv_proto_iconv], [
         AC_COMPILE_IFELSE(
           [AC_LANG_PROGRAM(
              [[
   #include <stdlib.h>
   #include <iconv.h>
   extern
   #ifdef __cplusplus
   "C"
   #endif
   #if defined(__STDC__) || defined(_MSC_VER) || defined(__cplusplus)
   size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
   #else
   size_t iconv();
   #endif
              ]],
              [[]])],
           [am_cv_proto_iconv_arg1=""],
           [am_cv_proto_iconv_arg1="const"])
         am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
       am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
       AC_MSG_RESULT([$am_cv_proto_iconv])
     else
       dnl When compiling GNU libiconv on a system that does not have iconv yet,
       dnl pick the POSIX compliant declaration without 'const'.
       am_cv_proto_iconv_arg1=""
     fi
     AC_DEFINE_UNQUOTED([ICONV_CONST], [$am_cv_proto_iconv_arg1],
       [Define as const if the declaration of iconv() needs const.])
     dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>.
     m4_ifdef([gl_ICONV_H_DEFAULTS],
       [AC_REQUIRE([gl_ICONV_H_DEFAULTS])
        if test -n "$am_cv_proto_iconv_arg1"; then
          ICONV_CONST="const"
        fi
       ])
   ])

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