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Diffstat (limited to 'gl/m4/mbrtoc32.m4')
| -rw-r--r-- | gl/m4/mbrtoc32.m4 | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/gl/m4/mbrtoc32.m4 b/gl/m4/mbrtoc32.m4 new file mode 100644 index 0000000..c1eb126 --- /dev/null +++ b/gl/m4/mbrtoc32.m4 @@ -0,0 +1,266 @@ +# mbrtoc32.m4 serial 18 +dnl Copyright (C) 2014-2024 Free Software Foundation, 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. + +AC_DEFUN([gl_FUNC_MBRTOC32], +[ + AC_REQUIRE([gl_UCHAR_H_DEFAULTS]) + + AC_REQUIRE([AC_TYPE_MBSTATE_T]) + dnl Determine REPLACE_MBSTATE_T, from which GNULIB_defined_mbstate_t is + dnl determined. It describes how our overridden mbrtowc is implemented. + dnl We then implement mbrtoc32 accordingly. + AC_REQUIRE([gl_MBSTATE_T_BROKEN]) + + AC_REQUIRE([gl_TYPE_CHAR32_T]) + AC_REQUIRE([gl_MBRTOC32_SANITYCHECK]) + + AC_REQUIRE([gl_CHECK_FUNC_MBRTOC32]) + if test $gl_cv_func_mbrtoc32 = no; then + HAVE_MBRTOC32=0 + else + if test $GNULIBHEADERS_OVERRIDE_CHAR32_T = 1 || test $REPLACE_MBSTATE_T = 1; then + REPLACE_MBRTOC32=1 + else + gl_MBRTOC32_EMPTY_INPUT + gl_MBRTOC32_C_LOCALE + case "$gl_cv_func_mbrtoc32_empty_input" in + *yes) ;; + *) AC_DEFINE([MBRTOC32_EMPTY_INPUT_BUG], [1], + [Define if the mbrtoc32 function does not return (size_t) -2 for empty input.]) + REPLACE_MBRTOC32=1 + ;; + esac + case "$gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ" in + *yes) ;; + *) AC_DEFINE([MBRTOC32_IN_C_LOCALE_MAYBE_EILSEQ], [1], + [Define if the mbrtoc32 function may signal encoding errors in the C locale.]) + REPLACE_MBRTOC32=1 + ;; + esac + fi + if test $HAVE_WORKING_MBRTOC32 = 0; then + REPLACE_MBRTOC32=1 + fi + fi +]) + +AC_DEFUN([gl_CHECK_FUNC_MBRTOC32], +[ + dnl Cf. gl_CHECK_FUNCS_ANDROID + AC_CHECK_DECL([mbrtoc32], , , + [[#ifdef __HAIKU__ + #include <stdint.h> + #endif + #include <uchar.h> + ]]) + if test $ac_cv_have_decl_mbrtoc32 = yes; then + dnl We can't use AC_CHECK_FUNC here, because mbrtoc32() is defined as a + dnl static inline function on Haiku 2020. + AC_CACHE_CHECK([for mbrtoc32], [gl_cv_func_mbrtoc32], + [AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdlib.h> + #ifdef __HAIKU__ + #include <stdint.h> + #endif + #include <uchar.h> + ]], + [[char32_t c; + return mbrtoc32 (&c, "", 1, NULL) == 0; + ]]) + ], + [gl_cv_func_mbrtoc32=yes], + [gl_cv_func_mbrtoc32=no]) + ]) + else + gl_cv_func_mbrtoc32=no + fi +]) + +dnl Test whether mbrtoc32 returns the correct value on empty input. + +AC_DEFUN([gl_MBRTOC32_EMPTY_INPUT], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether mbrtoc32 works on empty input], + [gl_cv_func_mbrtoc32_empty_input], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ + #ifdef __HAIKU__ + #include <stdint.h> + #endif + #include <uchar.h> + static char32_t wc; + static mbstate_t mbs; + int + main (void) + { + return mbrtoc32 (&wc, "", 0, &mbs) != (size_t) -2; + }]])], + [gl_cv_func_mbrtoc32_empty_input=yes], + [gl_cv_func_mbrtoc32_empty_input=no], + [case "$host_os" in + # Guess no on glibc systems. + *-gnu* | gnu*) gl_cv_func_mbrtoc32_empty_input="guessing no" ;; + # Guess no on Android. + linux*-android*) gl_cv_func_mbrtoc32_empty_input="guessing no" ;; + # Guess no on native Windows. + mingw* | windows*) gl_cv_func_mbrtoc32_empty_input="guessing no" ;; + *) gl_cv_func_mbrtoc32_empty_input="guessing yes" ;; + esac + ]) + ]) +]) + +dnl <https://pubs.opengroup.org/onlinepubs/9699919799/functions/mbrtowc.html> +dnl POSIX:2018 says regarding mbrtowc: "In the POSIX locale an [EILSEQ] error +dnl cannot occur since all byte values are valid characters." It is reasonable +dnl to expect mbrtoc32 to behave in the same way. + +AC_DEFUN([gl_MBRTOC32_C_LOCALE], +[ + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether the C locale is free of encoding errors], + [gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ], + [AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[#include <limits.h> + #include <locale.h> + #ifdef __HAIKU__ + #include <stdint.h> + #endif + #include <uchar.h> + ]], [[ + int i; + char *locale = setlocale (LC_ALL, "C"); + if (! locale) + return 2; + for (i = CHAR_MIN; i <= CHAR_MAX; i++) + { + char c = i; + char32_t wc; + mbstate_t mbs = { 0, }; + size_t ss = mbrtoc32 (&wc, &c, 1, &mbs); + if (1 < ss) + return 3; + } + return 0; + ]])], + [gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ=yes], + [gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ=no], + [case "$host_os" in + # Guess yes on native Windows. + mingw* | windows*) gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ="guessing yes" ;; + *) gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ="$gl_cross_guess_normal" ;; + esac + ]) + ]) +]) + +dnl Test whether mbrtoc32 works not worse than mbrtowc. +dnl Result is HAVE_WORKING_MBRTOC32. + +AC_DEFUN([gl_MBRTOC32_SANITYCHECK], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([gl_TYPE_CHAR32_T]) + AC_REQUIRE([gl_CHECK_FUNC_MBRTOC32]) + AC_REQUIRE([gt_LOCALE_FR]) + AC_REQUIRE([gt_LOCALE_ZH_CN]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + if test $GNULIBHEADERS_OVERRIDE_CHAR32_T = 1 || test $gl_cv_func_mbrtoc32 = no; then + HAVE_WORKING_MBRTOC32=0 + else + AC_CACHE_CHECK([whether mbrtoc32 works as well as mbrtowc], + [gl_cv_func_mbrtoc32_sanitycheck], + [ + dnl Initial guess, used when cross-compiling or when no suitable locale + dnl is present. +changequote(,)dnl + case "$host_os" in + # Guess no on FreeBSD, Solaris, native Windows. + freebsd* | midnightbsd* | solaris* | mingw* | windows*) + gl_cv_func_mbrtoc32_sanitycheck="guessing no" + ;; + # Guess yes otherwise. + *) + gl_cv_func_mbrtoc32_sanitycheck="guessing yes" + ;; + esac +changequote([,])dnl + if test $LOCALE_FR != none || test $LOCALE_ZH_CN != none; then + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <locale.h> +#include <stdlib.h> +#include <string.h> +#include <wchar.h> +#ifdef __HAIKU__ + #include <stdint.h> +#endif +#include <uchar.h> +int main () +{ + int result = 0; + /* This fails on native Windows: + mbrtoc32 returns (size_t)-1. + mbrtowc returns 1 (correct). */ + if (strcmp ("$LOCALE_FR", "none") != 0 + && setlocale (LC_ALL, "$LOCALE_FR") != NULL) + { + mbstate_t state; + wchar_t wc = (wchar_t) 0xBADFACE; + memset (&state, '\0', sizeof (mbstate_t)); + if (mbrtowc (&wc, "\374", 1, &state) == 1) + { + char32_t c32 = (wchar_t) 0xBADFACE; + memset (&state, '\0', sizeof (mbstate_t)); + if (mbrtoc32 (&c32, "\374", 1, &state) != 1) + result |= 1; + } + } + /* This fails on FreeBSD 13.0 and Solaris 11.4: + mbrtoc32 returns (size_t)-2 or (size_t)-1. + mbrtowc returns 4 (correct). */ + if (strcmp ("$LOCALE_ZH_CN", "none") != 0 + && setlocale (LC_ALL, "$LOCALE_ZH_CN") != NULL) + { + mbstate_t state; + wchar_t wc = (wchar_t) 0xBADFACE; + memset (&state, '\0', sizeof (mbstate_t)); + if (mbrtowc (&wc, "\224\071\375\067", 4, &state) == 4) + { + char32_t c32 = (wchar_t) 0xBADFACE; + memset (&state, '\0', sizeof (mbstate_t)); + if (mbrtoc32 (&c32, "\224\071\375\067", 4, &state) != 4) + result |= 2; + } + } + return result; +}]])], + [gl_cv_func_mbrtoc32_sanitycheck=yes], + [gl_cv_func_mbrtoc32_sanitycheck=no], + [:]) + fi + ]) + case "$gl_cv_func_mbrtoc32_sanitycheck" in + *yes) + HAVE_WORKING_MBRTOC32=1 + AC_DEFINE([HAVE_WORKING_MBRTOC32], [1], + [Define if the mbrtoc32 function basically works.]) + ;; + *) HAVE_WORKING_MBRTOC32=0 ;; + esac + fi + AC_SUBST([HAVE_WORKING_MBRTOC32]) +]) + +# Prerequisites of lib/mbrtoc32.c and lib/lc-charset-dispatch.c. +AC_DEFUN([gl_PREREQ_MBRTOC32], [ + : +]) |