-# ftello.m4 serial 5
-dnl Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+# ftello.m4 serial 11
+dnl Copyright (C) 2007-2012 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_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 fseeko().
+ 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_TRY_LINK([#include <stdio.h>], [ftello (stdin);],
- [gl_cv_func_ftello=yes], [gl_cv_func_ftello=no])
+ 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 \
- || test $gl_cv_var_stdin_large_offset = no; then
- gl_REPLACE_FTELLO
+ 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
])
-AC_DEFUN([gl_REPLACE_FTELLO],
+# Prerequisites of lib/ftello.c.
+AC_DEFUN([gl_PREREQ_FTELLO],
[
- AC_LIBOBJ([ftello])
- AC_REQUIRE([gl_STDIO_H_DEFAULTS])
- REPLACE_FTELLO=1
+ dnl Native Windows has the function _ftelli64. mingw hides it, but mingw64
+ dnl makes it usable again.
+ AC_CHECK_FUNCS([_ftelli64])
])
projects / debian / gzip / blobdiff