X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-snprintf-posix.h;h=43329300b8976da270b17ca8035f7bcdf45ebc3f;hb=cfa381fc27ccee5fefcab6be96596f63d84d1fa5;hp=4d69267a6273d3a87f89d4fb43f1cdf4dbf63dfa;hpb=06945b7c073c0872ec2049c0e0b94f789bf8d77e;p=gnulib.git

diff --git a/tests/test-snprintf-posix.h b/tests/test-snprintf-posix.h
index 4d69267a6..43329300b 100644
--- a/tests/test-snprintf-posix.h
+++ b/tests/test-snprintf-posix.h
@@ -16,17 +16,25 @@
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
 
-#include <math.h>
+#include "nan.h"
 
 /* The SGI MIPS floating-point format does not distinguish 0.0 and -0.0.  */
 static int
 have_minus_zero ()
 {
   static double plus_zero = 0.0;
-  static double minus_zero = -0.0;
+  double minus_zero = - plus_zero;
   return memcmp (&plus_zero, &minus_zero, sizeof (double)) != 0;
 }
 
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
+   So we use -zero instead.  */
+double zerod = 0.0;
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0L.
+   So we use -zero instead.  */
+long double zerol = 0.0L;
+
 /* Representation of an 80-bit 'long double' as an initializer for a sequence
    of 'unsigned int' words.  */
 #ifdef WORDS_BIGENDIAN
@@ -172,7 +180,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%a %d", -0.0, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%a %d", -zerod, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0x0p+0 33") == 0);
     ASSERT (retval == strlen (result));
@@ -197,7 +205,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%a %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%a %d", NaNd (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -394,7 +402,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* FLAG_ZERO with NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%050a %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%050a %d", NaNd (), 33, 44, 55);
     /* "0000000nan 33" is not a valid result; see
        <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
     ASSERT (strlen (result) == 50 + 3
@@ -436,7 +444,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%La %d", -0.0L, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%La %d", -zerol, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0x0p+0 33") == 0);
     ASSERT (retval == strlen (result));
@@ -461,7 +469,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%La %d", 0.0L / 0.0L, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%La %d", NaNl (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -746,7 +754,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* FLAG_ZERO with NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%050La %d", 0.0L / 0.0L, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%050La %d", NaNl (), 33, 44, 55);
     /* "0000000nan 33" is not a valid result; see
        <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
     ASSERT (strlen (result) == 50 + 3
@@ -881,7 +889,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%f %d", -0.0, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%f %d", -zerod, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0.000000 33") == 0);
     ASSERT (retval == strlen (result));
@@ -908,7 +916,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%f %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%f %d", NaNd (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -989,7 +997,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* FLAG_ZERO with NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%050f %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%050f %d", NaNd (), 33, 44, 55);
     ASSERT (strlen (result) == 50 + 3
 	    && strisnan (result, strspn (result, " "), strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -1004,6 +1012,22 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  { /* Precision with no rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.2f %d", 999.951, 33, 44, 55);
+    ASSERT (strcmp (result, "999.95 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision with rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.2f %d", 999.996, 33, 44, 55);
+    ASSERT (strcmp (result, "1000.00 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
   { /* A positive number.  */
     char result[100];
     int retval =
@@ -1128,7 +1152,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%Lf %d", -0.0L, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%Lf %d", -zerol, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0.000000 33") == 0);
     ASSERT (retval == strlen (result));
@@ -1153,10 +1177,9 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   }
 
   { /* NaN.  */
-    static long double zero = 0.0L;
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%Lf %d", zero / zero, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%Lf %d", NaNl (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -1322,10 +1345,9 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   }
 
   { /* FLAG_ZERO with NaN.  */
-    static long double zero = 0.0L;
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%050Lf %d", zero / zero, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%050Lf %d", NaNl (), 33, 44, 55);
     ASSERT (strlen (result) == 50 + 3
 	    && strisnan (result, strspn (result, " "), strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -1340,6 +1362,22 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  { /* Precision with no rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.2Lf %d", 999.951L, 33, 44, 55);
+    ASSERT (strcmp (result, "999.95 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision with rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.2Lf %d", 999.996L, 33, 44, 55);
+    ASSERT (strcmp (result, "1000.00 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
   /* Test the support of the %F format directive.  */
 
   { /* A positive number.  */
@@ -1377,7 +1415,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%F %d", -0.0, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%F %d", -zerod, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0.000000 33") == 0);
     ASSERT (retval == strlen (result));
@@ -1404,7 +1442,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%F %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%F %d", NaNd (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 1)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -1436,6 +1474,22 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  { /* Precision with no rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.2F %d", 999.951, 33, 44, 55);
+    ASSERT (strcmp (result, "999.95 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision with rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.2F %d", 999.996, 33, 44, 55);
+    ASSERT (strcmp (result, "1000.00 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
   { /* A positive number.  */
     char result[100];
     int retval =
@@ -1471,7 +1525,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%LF %d", -0.0L, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%LF %d", -zerol, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0.000000 33") == 0);
     ASSERT (retval == strlen (result));
@@ -1496,10 +1550,9 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   }
 
   { /* NaN.  */
-    static long double zero = 0.0L;
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%LF %d", zero / zero, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%LF %d", NaNl (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 1)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -1531,6 +1584,22 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  { /* Precision with no rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.2LF %d", 999.951L, 33, 44, 55);
+    ASSERT (strcmp (result, "999.95 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision with rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.2LF %d", 999.996L, 33, 44, 55);
+    ASSERT (strcmp (result, "1000.00 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
   /* Test the support of the %e format directive.  */
 
   { /* A positive number.  */
@@ -1670,7 +1739,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%e %d", -0.0, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%e %d", -zerod, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0.000000e+00 33") == 0
 	      || strcmp (result, "-0.000000e+000 33") == 0);
@@ -1698,7 +1767,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%e %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%e %d", NaNd (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -1789,7 +1858,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* FLAG_ZERO with NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%050e %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%050e %d", NaNd (), 33, 44, 55);
     ASSERT (strlen (result) == 50 + 3
 	    && strisnan (result, strspn (result, " "), strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -1805,6 +1874,24 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  { /* Precision with no rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.4e %d", 999.951, 33, 44, 55);
+    ASSERT (strcmp (result, "9.9995e+02 33") == 0
+	    || strcmp (result, "9.9995e+002 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision with rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.4e %d", 999.996, 33, 44, 55);
+    ASSERT (strcmp (result, "1.0000e+03 33") == 0
+	    || strcmp (result, "1.0000e+003 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
   { /* A positive number.  */
     char result[100];
     int retval =
@@ -1929,7 +2016,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%Le %d", -0.0L, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%Le %d", -zerol, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0.000000e+00 33") == 0);
     ASSERT (retval == strlen (result));
@@ -1954,10 +2041,9 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   }
 
   { /* NaN.  */
-    static long double zero = 0.0L;
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%Le %d", zero / zero, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%Le %d", NaNl (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -2125,10 +2211,9 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   }
 
   { /* FLAG_ZERO with NaN.  */
-    static long double zero = 0.0L;
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%050Le %d", zero / zero, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%050Le %d", NaNl (), 33, 44, 55);
     ASSERT (strlen (result) == 50 + 3
 	    && strisnan (result, strspn (result, " "), strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -2143,6 +2228,22 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  { /* Precision with no rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.4Le %d", 999.951L, 33, 44, 55);
+    ASSERT (strcmp (result, "9.9995e+02 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision with rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.4Le %d", 999.996L, 33, 44, 55);
+    ASSERT (strcmp (result, "1.0000e+03 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
   /* Test the support of the %g format directive.  */
 
   { /* A positive number.  */
@@ -2279,7 +2380,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%g %d", -0.0, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%g %d", -zerod, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0 33") == 0);
     ASSERT (retval == strlen (result));
@@ -2306,7 +2407,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%g %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%g %d", NaNd (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -2390,7 +2491,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* FLAG_ZERO with NaN.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%050g %d", NAN, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%050g %d", NaNd (), 33, 44, 55);
     ASSERT (strlen (result) == 50 + 3
 	    && strisnan (result, strspn (result, " "), strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -2406,6 +2507,22 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  { /* Precision with no rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.5g %d", 999.951, 33, 44, 55);
+    ASSERT (strcmp (result, "999.95 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision with rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.5g %d", 999.996, 33, 44, 55);
+    ASSERT (strcmp (result, "1000 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
   { /* A positive number.  */
     char result[100];
     int retval =
@@ -2530,7 +2647,7 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   { /* Negative zero.  */
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%Lg %d", -0.0L, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%Lg %d", -zerol, 33, 44, 55);
     if (have_minus_zero ())
       ASSERT (strcmp (result, "-0 33") == 0);
     ASSERT (retval == strlen (result));
@@ -2555,10 +2672,9 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   }
 
   { /* NaN.  */
-    static long double zero = 0.0L;
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%Lg %d", zero / zero, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%Lg %d", NaNl (), 33, 44, 55);
     ASSERT (strlen (result) >= 3 + 3
 	    && strisnan (result, 0, strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -2726,10 +2842,9 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   }
 
   { /* FLAG_ZERO with NaN.  */
-    static long double zero = 0.0L;
     char result[100];
     int retval =
-      my_snprintf (result, sizeof (result), "%050Lg %d", zero / zero, 33, 44, 55);
+      my_snprintf (result, sizeof (result), "%050Lg %d", NaNl (), 33, 44, 55);
     ASSERT (strlen (result) == 50 + 3
 	    && strisnan (result, strspn (result, " "), strlen (result) - 3, 0)
 	    && strcmp (result + strlen (result) - 3, " 33") == 0);
@@ -2744,6 +2859,22 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  { /* Precision with no rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.5Lg %d", 999.951L, 33, 44, 55);
+    ASSERT (strcmp (result, "999.95 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision with rounding.  */
+    char result[100];
+    int retval =
+      my_snprintf (result, sizeof (result), "%.5Lg %d", 999.996L, 33, 44, 55);
+    ASSERT (strcmp (result, "1000 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
   /* Test the support of the %n format directive.  */
 
   {
@@ -2819,6 +2950,18 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
   {
     char result[5000];
     int retval =
+      my_snprintf (result, sizeof (result), "%.*d %d", 4000, 1234567, 99);
+    size_t i;
+    ASSERT (result != NULL);
+    for (i = 0; i < 4000 - 7; i++)
+      ASSERT (result[i] == '0');
+    ASSERT (strcmp (result + 4000 - 7, "1234567 99") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  {
+    char result[5000];
+    int retval =
       my_snprintf (result, sizeof (result), "%.4000d %d", -1234567, 99);
     size_t i;
     ASSERT (result != NULL);