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Diffstat (limited to 'm4/iconv.m4')
| -rw-r--r-- | m4/iconv.m4 | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/m4/iconv.m4 b/m4/iconv.m4 new file mode 100644 index 0000000..0005795 --- /dev/null +++ b/m4/iconv.m4 @@ -0,0 +1,283 @@ +# iconv.m4 serial 24 +dnl Copyright (C) 2000-2002, 2007-2014, 2016-2022 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_PREREQ([2.64]) + +dnl Note: AM_ICONV is documented in the GNU gettext manual +dnl <https://www.gnu.org/software/gettext/manual/html_node/AM_005fICONV.html>. +dnl Don't make changes that are incompatible with that documentation! + +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 $INCICONV to CPPFLAGS before performing the following checks, + dnl because if the user has installed libiconv and not disabled its use + dnl via --without-libiconv-prefix, he wants to use it. The first + dnl AC_LINK_IFELSE will then fail, the second AC_LINK_IFELSE will succeed. + am_save_CPPFLAGS="$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...7.2 bug: Failures are not distinguishable from + successful returns. This is even documented in + <https://www.ibm.com/support/knowledgecenter/ssw_aix_72/i_bostechref/iconv.html> */ + { + 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, in order to 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 $1" +dnl warnings. +AC_DEFUN_ONCE([AM_ICONV], +[ + AM_ICONV_LINK + if test "$am_cv_func_iconv" = yes; then + AC_CACHE_CHECK([whether iconv is compatible with its POSIX signature], + [gl_cv_iconv_nonconst], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[ +#include <stdlib.h> +#include <iconv.h> +extern +#ifdef __cplusplus +"C" +#endif +size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft); + ]], + [[]])], + [gl_cv_iconv_nonconst=yes], + [gl_cv_iconv_nonconst=no]) + ]) + else + dnl When compiling GNU libiconv on a system that does not have iconv yet, + dnl pick the POSIX compliant declaration without 'const'. + gl_cv_iconv_nonconst=yes + fi + if test $gl_cv_iconv_nonconst = yes; then + iconv_arg1="" + else + iconv_arg1="const" + fi + AC_DEFINE_UNQUOTED([ICONV_CONST], [$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 $gl_cv_iconv_nonconst != yes; then + ICONV_CONST="const" + fi + ]) +]) |