X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffflush.m4;h=97f12843d4f1f111580cf616d0ac1b6afed3c0ef;hb=f1fcb8539c9d1c7d9cefb25ce5c07a099ea1f148;hp=161680f2cea0f217fe812bf992f9d3c40ff54d95;hpb=2f2eba1862c526737baf2dfe605bf5257133adeb;p=gnulib.git

diff --git a/m4/fflush.m4 b/m4/fflush.m4
old mode 100755
new mode 100644
index 161680f2c..97f12843d
--- a/m4/fflush.m4
+++ b/m4/fflush.m4
@@ -1,6 +1,6 @@
-#serial 1
+# fflush.m4 serial 6
 
-# Copyright (C) 2007 Free Software Foundation, Inc.
+# Copyright (C) 2007-2008 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
@@ -20,9 +20,12 @@ AC_DEFUN([gl_FUNC_FFLUSH],
 #include <stdio.h>
 #include <unistd.h>
        ]], [[FILE *f = fopen ("conftest.txt", "r");
-         char buffer[10];
-	 int fd = fileno (f);
-         if (!f || 0 > fd || fread (buffer, 1, 5, f) != 5)
+	 char buffer[10];
+	 int fd;
+	 if (f == NULL)
+	   return 1;
+	 fd = fileno (f);
+	 if (fd < 0 || fread (buffer, 1, 5, f) != 5)
 	   return 2;
 	 /* For deterministic results, ensure f read a bigger buffer.  */
 	 if (lseek (fd, 0, SEEK_CUR) == 5)
@@ -30,7 +33,11 @@ AC_DEFUN([gl_FUNC_FFLUSH],
 	 /* POSIX requires fflush-fseek to set file offset of fd.  */
 	 if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
 	   return 4;
-	 return !(lseek (fd, 0, SEEK_CUR) == 5);
+	 if (lseek (fd, 0, SEEK_CUR) != 5)
+	   return 5;
+	 /* TODO: Verify behaviour of fflush after ungetc, see
+	    <http://lists.gnu.org/archive/html/bug-gnulib/2008-03/msg00131.html>.  */
+	 return 0;
        ]])], [gl_cv_func_fflush_stdin=yes], [gl_cv_func_fflush_stdin=no],
      [dnl Pessimistically assume fflush is broken.  This is wrong for
       dnl at least glibc and cygwin; but lib/fflush.c takes this into account.
@@ -45,6 +52,16 @@ AC_DEFUN([gl_FUNC_FFLUSH],
 AC_DEFUN([gl_REPLACE_FFLUSH],
 [
   AC_LIBOBJ([fflush])
+  AC_LIBOBJ([fseeko])
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
   REPLACE_FFLUSH=1
+  REPLACE_FSEEKO=1
+  gl_PREREQ_FFLUSH
+])
+
+# Prerequisites of lib/fflush.c.
+AC_DEFUN([gl_PREREQ_FFLUSH],
+[
+  AC_REQUIRE([AC_C_INLINE])
+  :
 ])