doc: use ASCII in .texi files where UTF-8 isn't needed

[gnulib.git] / tests / test-quotearg-simple.c

diff --git a/tests/test-quotearg-simple.c b/tests/test-quotearg-simple.c
index e21ceb0..08aadc1 100644 (file)
--- a/tests/test-quotearg-simple.c
+++ b/tests/test-quotearg-simple.c
@@ -1,5 +1,5 @@
 /* Test of quotearg family of functions.
-   Copyright (C) 2008-2012 Free Software Foundation, Inc.
+   Copyright (C) 2008-2014 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -12,8 +12,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Eric Blake <ebb9@byu.net>, 2008.  */
 
@@ -30,6 +29,7 @@
 #include "localcharset.h"
 #include "progname.h"
 #include "macros.h"
+#include "zerosize-ptr.h"
 
 #include "test-quotearg.h"
 
@@ -298,6 +298,40 @@ main (int argc _GL_UNUSED, char *argv[])
                        ascii_only);
     }
 
+  {
+    /* Trigger the bug whereby quotearg_buffer would read beyond the NUL
+       that defines the end of the string being quoted.  Use an input
+       string whose NUL is the last byte before an unreadable page.  */
+    char *z = zerosize_ptr ();
+
+    if (z)
+      {
+        size_t q_len = 1024;
+        char *q = malloc (q_len + 1);
+        char buf[10];
+        memset (q, 'Q', q_len);
+        q[q_len] = 0;
+
+        /* Z points to the boundary between a readable/writable page
+           and one that is neither readable nor writable.  Position
+           our string so its NUL is at the end of the writable one.  */
+        char const *str = "____";
+        size_t s_len = strlen (str);
+        z -= s_len + 1;
+        memcpy (z, str, s_len + 1);
+
+        set_custom_quoting (NULL, q, q);
+        /* Whether this actually triggers a SEGV depends on the
+           implementation of memcmp: whether it compares only byte-at-
+           a-time, and from left to right (no SEGV) or some other way.  */
+        size_t n = quotearg_buffer (buf, sizeof buf, z, SIZE_MAX, NULL);
+        ASSERT (n == s_len + 2 * q_len);
+        ASSERT (memcmp (buf, q, sizeof buf) == 0);
+        free (q);
+      }
+  }
+
   quotearg_free ();
+
   return 0;
 }