Mercurial > gnulib
view m4/ftello.m4 @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | 6a9ea5d7b466 |
children | 344018b6e5d7 |
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# ftello.m4 serial 11 dnl Copyright (C) 2007-2013 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 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) 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)) return 74; if (!(getc (fp) == 'h')) return 1; if (!(getc (fp) == EOF)) return 2; if (!(ftell (fp) == 8)) return 3; if (!(ftell (fp) == 8)) return 4; if (!(putc ('!', fp) == '!')) return 5; if (!(ftell (fp) == 9)) 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)) return 10; if (!(memcmp (buf, "foogarsh!", 9) == 0)) 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]) ])