2007-01-22  Ulrich Drepper  <drepper@redhat.com>

	[BZ #3902]
	* stdio-common/_itoa.c (_itoa): Make sure at least a zero is emitted.
	* stdio-common/Makefile (tests): Add bug17.
	* stdio-common/bug17.c: New file.

--- libc/stdio-common/_itoa.c	6 Jun 2004 06:02:14 -0000	1.21
+++ libc/stdio-common/_itoa.c	22 Jan 2007 16:16:08 -0000	1.22
@@ -269,6 +269,7 @@ _itoa (value, buflim, base, upper_case)
 
     default:
       {
+	char *bufend = buflim;
 #if BITS_PER_MP_LIMB == 64
 	mp_limb_t base_multiplier = brec->base_multiplier;
 	if (brec->flag)
@@ -454,6 +455,8 @@ _itoa (value, buflim, base, upper_case)
 	  }
 	while (n != 0);
 #endif
+	if (buflim == bufend)
+	  *--buflim = '0';
       }
       break;
     }
--- libc/stdio-common/Makefile	3 Aug 2006 09:25:01 -0000	1.98
+++ libc/stdio-common/Makefile	22 Jan 2007 16:17:13 -0000	1.99
@@ -54,7 +54,7 @@ tests := tstscanf test_rdwr test-popen t
 	 tst-swprintf tst-fseek tst-fmemopen test-vfprintf tst-gets \
 	 tst-perror tst-sprintf tst-rndseek tst-fdopen tst-fphex bug14 bug15 \
 	 tst-popen tst-unlockedio tst-fmemopen2 tst-put-error tst-fgets \
-	 tst-fwrite bug16
+	 tst-fwrite bug16 bug17
 
 test-srcs = tst-unbputc tst-printf
 
--- libc/stdio-common/bug17.c	1 Jan 1970 00:00:00 -0000
+++ libc/stdio-common/bug17.c	22 Jan 2007 16:17:04 -0000	1.1
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <string.h>
+
+static int
+do_test (void)
+{
+  static const char expect[] = "0, 0, 0";
+  char buf[100];
+  int status = 0;
+
+  static const char fmt1[] = "%0d, %0ld, %0lld";
+  snprintf (buf, sizeof (buf), fmt1, 0, 0L, 0LL);
+  if (strcmp (buf, expect) != 0)
+    {
+      printf ("\"%s\": got \"%s\", expected \"%s\"\n", fmt1, buf, expect);
+      status = 1;
+    }
+
+  static const char fmt2[] = "%0u, %0lu, %0llu";
+  snprintf (buf, sizeof (buf), fmt2, 0u, 0uL, 0uLL);
+  if (strcmp (buf, expect) != 0)
+    {
+      printf ("\"%s\": got \"%s\", expected \"%s\"\n", fmt2, buf, expect);
+      status = 1;
+    }
+
+  return status;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"