[PATCH] sscanf test failure when cross-compiling and running tests under Wine

[Richard W.M. Jones]

The attached patch fixes a small test problem which was revealed when
cross-compiling libgmp 4.2.4 and then running the test suite under
Wine.

It is actually a bug (or feature) of Windows implementation of scanf,
which is that it doesn't skip whitespace before %-specifiers:

  http://msdn.microsoft.com/en-us/library/kwwtf9ch(VS.71).aspx

Rich.

-- 
Richard Jones, Emerging Technologies, Red Hat  http://et.redhat.com/~rjones
Read my OCaml programming blog: http://camltastic.blogspot.com/
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-------------- next part --------------
--- gmp-4.2.4.orig/tests/misc/t-scanf.c	2008-08-02 21:11:59.000000000 +0100
+++ gmp-4.2.4.sscanf/tests/misc/t-scanf.c	2009-01-28 16:42:26.000000000 +0000
@@ -93,6 +93,24 @@
   return result;
 }
 
+/* This is a problem found on i686-pc-mingw32, running binaries under
+   Wine.  Windows scanf functions don't skip whitespace before %-specifiers
+   [http://msdn.microsoft.com/en-us/library/kwwtf9ch(VS.71).aspx] */
+int
+test_sscanf_s_skips_whitespace (void)
+{
+  char str[16];
+
+  if (sscanf (" ", "%s", str) == EOF)
+    return 1;
+  else
+    {
+      printf ("Warning, sscanf (\" \", \"%s\", str) != EOF.\n");
+      printf ("This affects gmp_sscanf, some tests will be suppressed.\n");
+      return 0;
+    }
+}
+
 
 /* Convert fmt from a GMP scanf format string to an equivalent for a plain
    libc scanf, for example "%Zd" becomes "%ld".  Return 1 if this succeeds,
@@ -1489,6 +1507,7 @@
   }
 
   /* EOF for no matching */
+  if (test_sscanf_s_skips_whitespace ())
   {
     char buf[128];
     ret = gmp_sscanf ("   ", "%s", buf);