Fix iconv error checks for UCS-4 conversions (bug 19726)

diff --git a/iconv/Makefile b/iconv/Makefile
index c2299c9..30c8e83 100644
--- a/iconv/Makefile
+++ b/iconv/Makefile
@@ -42,7 +42,8 @@  CFLAGS-charmap.c = -DCHARMAP_PATH='"$(i18ndir)/charmaps"' \
 CFLAGS-linereader.c = -DNO_TRANSLITERATION
 CFLAGS-simple-hash.c = -I../locale
 
-tests	= tst-iconv1 tst-iconv2 tst-iconv3 tst-iconv4 tst-iconv5 tst-iconv6
+tests	= tst-iconv1 tst-iconv2 tst-iconv3 tst-iconv4 tst-iconv5 tst-iconv6 \
+	  tst-iconv7
 
 others		= iconv_prog iconvconfig
 install-others-programs	= $(inst_bindir)/iconv
diff --git a/iconv/gconv_simple.c b/iconv/gconv_simple.c
index cf93a16..0aa8115 100644
--- a/iconv/gconv_simple.c
+++ b/iconv/gconv_simple.c
@@ -313,7 +313,7 @@  ucs4_internal_loop_unaligned (struct __gconv_step *step,
 
   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
     {
-      if (__glibc_unlikely (inptr[0] > 0x80))
+      if (__glibc_unlikely (inptr[0] > 0x7f))
 	{
 	  /* The value is too large.  We don't try transliteration here since
 	     this is not an error because of the lack of possibilities to
@@ -391,7 +391,7 @@  ucs4_internal_loop_single (struct __gconv_step *step,
       return __GCONV_INCOMPLETE_INPUT;
     }
 
-  if (__builtin_expect (((unsigned char *) state->__value.__wchb)[0] > 0x80,
+  if (__builtin_expect (((unsigned char *) state->__value.__wchb)[0] > 0x7f,
 			0))
     {
       /* The value is too large.  We don't try transliteration here since
@@ -644,6 +644,8 @@  ucs4le_internal_loop (struct __gconv_step *step,
 	      continue;
 	    }
 
+	  *inptrp = inptr;
+	  *outptrp = outptr;
 	  return __GCONV_ILLEGAL_INPUT;
 	}
 
@@ -688,7 +690,7 @@  ucs4le_internal_loop_unaligned (struct __gconv_step *step,
 
   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
     {
-      if (__glibc_unlikely (inptr[3] > 0x80))
+      if (__glibc_unlikely (inptr[3] > 0x7f))
 	{
 	  /* The value is too large.  We don't try transliteration here since
 	     this is not an error because of the lack of possibilities to
@@ -770,7 +772,7 @@  ucs4le_internal_loop_single (struct __gconv_step *step,
       return __GCONV_INCOMPLETE_INPUT;
     }
 
-  if (__builtin_expect (((unsigned char *) state->__value.__wchb)[3] > 0x80,
+  if (__builtin_expect (((unsigned char *) state->__value.__wchb)[3] > 0x7f,
 			0))
     {
       /* The value is too large.  We don't try transliteration here since
diff --git a/iconv/tst-iconv7.c b/iconv/tst-iconv7.c
new file mode 100644
index 0000000..341be49
--- /dev/null
+++ b/iconv/tst-iconv7.c
@@ -0,0 +1,97 @@ 
+/* Test iconv error checking with UCS-4
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Derived from BZ #19726.  */
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <iconv.h>
+
+int
+test_iconv (const char *test_name,
+	    const char *incode, const char *outcode, char *input, size_t size)
+{
+  iconv_t cd = iconv_open (outcode, incode);
+  if (cd == (iconv_t) -1)
+    {
+      printf ("%s: iconv_open failed\n", test_name);
+      return 1;
+    }
+
+  char *inptr = input;
+  size_t insize = size;
+  char output[size];
+  char *outptr = output;
+  size_t outsize = size;
+
+  size_t ret = iconv (cd, &inptr, &insize, &outptr, &outsize);
+  if (ret != (size_t) -1)
+    {
+      printf ("%s: iconv succeeded\n", test_name);
+      return 1;
+    }
+  if (errno != EILSEQ)
+    {
+      printf ("%s: iconv failed with %s\n", test_name, strerror (errno));
+      return 1;
+    }
+  if (inptr != (char *) input + 4)
+    {
+      printf ("%s: iconv consumed %td characters\n", test_name,
+	      inptr - (char *) input);
+      return 1;
+    }
+
+  if (iconv_close (cd) == -1)
+    {
+      printf ("%s: iconv_close failed\n", test_name);
+      return 1;
+    }
+  return 0;
+}
+
+int
+do_test (void)
+{
+  int ret = 0;
+  uint32_t input[3];
+
+  memset (input, 0, sizeof (input));
+  ((unsigned char *) input)[7] = 0x80;
+  ret |= test_iconv ("LE", "UCS-4LE", "UCS-4BE", (char *) input,
+		     sizeof (input));
+  memset (input, 0, sizeof (input));
+  ((unsigned char *) input)[8] = 0x80;
+  ret |= test_iconv ("LE unaligned", "UCS-4LE", "UCS-4BE", (char *) input + 1,
+		     sizeof (input));
+
+  memset (input, 0, sizeof (input));
+  ((unsigned char *) input)[4] = 0x80;
+  ret |= test_iconv ("BE", "UCS-4BE", "UCS-4LE", (char *) input,
+		     sizeof (input));
+  memset (input, 0, sizeof (input));
+  ((unsigned char *) input)[5] = 0x80;
+  ret |= test_iconv ("BE unaligned", "UCS-4BE", "UCS-4LE", (char *) input + 1,
+		     sizeof (input));
+
+  return ret;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"