Mercurial > gnulib
view m4/ftello.m4 @ 40177:dcd889592b62
dtoastr,ftoastr,ldtoastr: port to c-strtod changes
Decouple these modules from c-strtod. Nowadays it’s reasonable to
assume the C99 signatures for strtod and strtold. Programs that
require stricter adherence to C99 should also use the strtod and
strtold modules as needed, and we no longer need the
HAVE_C99_STRTOLD macro.
* NEWS: Mention this.
* lib/ftoastr.c (STRTOF) [LENGTH == 3]: Assume strtold.
* m4/c-strtod.m4 (gl_C_STRTOLD): Do not define HAVE_C99_STRTOLD.
* modules/dtoastr, modules/ftoastr, modules/ldtoastr:
(Files): Remove m4/c-strtod.m4.
(configure.ac): Do not require gl_C99_STRTOLD, which no longer
exists.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 02 Feb 2019 13:01:55 -0800 |
parents | b06060465f09 |
children |
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# ftello.m4 serial 13 dnl Copyright (C) 2007-2019 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_FTELLO], [ AC_REQUIRE([gl_STDIO_H_DEFAULTS]) AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([gl_STDIN_LARGE_OFFSET]) AC_REQUIRE([gl_SYS_TYPES_H]) dnl Persuade glibc <stdio.h> to declare ftello(). AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) AC_CHECK_DECLS_ONCE([ftello]) if test $ac_cv_have_decl_ftello = no; then HAVE_DECL_FTELLO=0 fi AC_CACHE_CHECK([for ftello], [gl_cv_func_ftello], [ AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#include <stdio.h>]], [[ftello (stdin);]])], [gl_cv_func_ftello=yes], [gl_cv_func_ftello=no]) ]) if test $gl_cv_func_ftello = no; then HAVE_FTELLO=0 else if test $WINDOWS_64_BIT_OFF_T = 1; then REPLACE_FTELLO=1 fi if test $gl_cv_var_stdin_large_offset = no; then REPLACE_FTELLO=1 fi if test $REPLACE_FTELLO = 0; then dnl Detect bug on Solaris. dnl ftell and ftello produce incorrect results after putc that followed a dnl getc call that reached EOF on Solaris. This is because the _IOREAD dnl flag does not get cleared in this case, even though _IOWRT gets set, dnl and ftell and ftello look whether the _IOREAD flag is set. AC_REQUIRE([AC_CANONICAL_HOST]) AC_CACHE_CHECK([whether ftello works], [gl_cv_func_ftello_works], [ dnl Initial guess, used when cross-compiling or when /dev/tty cannot dnl be opened. changequote(,)dnl case "$host_os" in # Guess no on Solaris. solaris*) gl_cv_func_ftello_works="guessing no" ;; # Guess yes on native Windows. mingw*) gl_cv_func_ftello_works="guessing yes" ;; # Guess yes otherwise. *) gl_cv_func_ftello_works="guessing yes" ;; esac changequote([,])dnl AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <stdio.h> #include <stdlib.h> #include <string.h> #define TESTFILE "conftest.tmp" int main (void) { FILE *fp; /* Create a file with some contents. */ fp = fopen (TESTFILE, "w"); if (fp == NULL) return 70; if (fwrite ("foogarsh", 1, 8, fp) < 8) { fclose (fp); return 71; } if (fclose (fp)) return 72; /* The file's contents is now "foogarsh". */ /* Try writing after reading to EOF. */ fp = fopen (TESTFILE, "r+"); if (fp == NULL) return 73; if (fseek (fp, -1, SEEK_END)) { fclose (fp); return 74; } if (!(getc (fp) == 'h')) { fclose (fp); return 1; } if (!(getc (fp) == EOF)) { fclose (fp); return 2; } if (!(ftell (fp) == 8)) { fclose (fp); return 3; } if (!(ftell (fp) == 8)) { fclose (fp); return 4; } if (!(putc ('!', fp) == '!')) { fclose (fp); return 5; } if (!(ftell (fp) == 9)) { fclose (fp); return 6; } if (!(fclose (fp) == 0)) return 7; fp = fopen (TESTFILE, "r"); if (fp == NULL) return 75; { char buf[10]; if (!(fread (buf, 1, 10, fp) == 9)) { fclose (fp); return 10; } if (!(memcmp (buf, "foogarsh!", 9) == 0)) { fclose (fp); return 11; } } if (!(fclose (fp) == 0)) return 12; /* The file's contents is now "foogarsh!". */ return 0; }]])], [gl_cv_func_ftello_works=yes], [gl_cv_func_ftello_works=no], [:]) ]) case "$gl_cv_func_ftello_works" in *yes) ;; *) REPLACE_FTELLO=1 AC_DEFINE([FTELLO_BROKEN_AFTER_SWITCHING_FROM_READ_TO_WRITE], [1], [Define to 1 if the system's ftello function has the Solaris bug.]) ;; esac fi fi ]) # Prerequisites of lib/ftello.c. AC_DEFUN([gl_PREREQ_FTELLO], [ dnl Native Windows has the function _ftelli64. mingw hides it, but mingw64 dnl makes it usable again. AC_CHECK_FUNCS([_ftelli64]) ])