* stdio-common/vfscanf.c: Fix problems in width accounting.

	* stdio-common/tst-sscanf.c (double_tests): New tests.
	(main): Hook them up.

ChangeLog

@@ -1,5 +1,9 @@
 2007-02-18  Ulrich Drepper  <drepper@redhat.com>
 
+	* stdio-common/vfscanf.c: Fix problems in width accounting.
+	* stdio-common/tst-sscanf.c (double_tests): New tests.
+	(main): Hook them up.
+
 	* stdio-common/vfscanf.c: Remove unused WIDTH handling.
 	More simplifications of floating-point reader.
 

stdio-common/tst-sscanf.c

@@ -65,7 +65,7 @@ const long int val_long[] =
   -12345678, 987654321, 123456789, 987654321, 123456789, 987654321
 };
 
-struct int_test
+struct test
 {
   const CHAR *str;
   const CHAR *fmt;
@@ -99,6 +99,17 @@ struct int_test
   { L("foo \t %bar1"), L("foo%%bar%d"), 1 }
 };
 
+struct test double_tests[] =
+{
+  { L("-1"), L("%1g"), 0 },
+  { L("-.1"), L("%2g"), 0 },
+  { L("-inf"), L("%3g"), 0 },
+  { L("+0"), L("%1g"),  },
+  { L("-0x1p0"), L("%2g"), 1 },
+  { L("-..1"), L("%g"), 0 },
+  { L("-inf"), L("%g"), 1 }
+};
+
 int
 main (void)
 {
@@ -172,5 +183,19 @@ main (void)
 	}
     }
 
+  for (i = 0; i < sizeof (double_tests) / sizeof (double_tests[0]); ++i)
+    {
+      double dummy;
+      int ret;
+
+      if ((ret = SSCANF (double_tests[i].str, double_tests[i].fmt,
+			 &dummy)) != double_tests[i].retval)
+	{
+	  printf ("double_tests[%d] returned %d != %d\n",
+		  i, ret, double_tests[i].retval);
+	  result = 1;
+	}
+    }
+
   return result;
 }

stdio-common/vfscanf.c

@@ -1585,6 +1585,8 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
 	case L_('a'):
 	case L_('A'):
 	  c = inchar ();
+	  if (width > 0)
+	    --width;
 	  if (__builtin_expect (c == EOF, 0))
 	    input_error ();
 
@@ -1712,7 +1714,7 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
 		}
 	    }
 
-	  do
+	  while (1)
 	    {
 	      if (ISDIGIT (c))
 		ADDW (c);
@@ -1818,10 +1820,13 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
 		    }
 #endif
 		}
+
+	      if (width == 0 || inchar () == EOF)
+		break;
+
 	      if (width > 0)
 		--width;
 	    }
-	  while (width != 0 && inchar () != EOF);
 
 	  /* Have we read any character?  If we try to read a number
 	     in hexadecimal notation and we have read only the `0x'