Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 560 insertions, 0 deletions

diff --git a/REORG.TODO/posix/wordexp-test.c b/REORG.TODO/posix/wordexp-test.c
new file mode 100644
index 0000000000..17ae812346
--- /dev/null
+++ b/REORG.TODO/posix/wordexp-test.c
@@ -0,0 +1,560 @@
+/* Copyright (C) 1997-2017 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/>.  */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wordexp.h>
+#include <libc-pointer-arith.h>
+
+#define IFS " \n\t"
+
+extern void *__dso_handle __attribute__ ((__weak__, __visibility__ ("hidden")));
+extern int __register_atfork (void (*) (void), void (*) (void), void (*) (void), void *);
+
+static int __app_register_atfork (void (*prepare) (void), void (*parent) (void), void (*child) (void))
+{
+  return __register_atfork (prepare, parent, child,
+			    &__dso_handle == NULL ? NULL : __dso_handle);
+}
+
+/* Number of forks seen.  */
+static int registered_forks;
+
+/* For each fork increment the fork count.  */
+static void
+register_fork (void)
+{
+  registered_forks++;
+}
+
+struct test_case_struct
+{
+  int retval;
+  const char *env;
+  const char *words;
+  int flags;
+  size_t wordc;
+  const char *wordv[10];
+  const char *ifs;
+} test_case[] =
+  {
+    /* Simple word- and field-splitting */
+    { 0, NULL, "one", 0, 1, { "one", }, IFS },
+    { 0, NULL, "one two", 0, 2, { "one", "two", }, IFS },
+    { 0, NULL, "one two three", 0, 3, { "one", "two", "three", }, IFS },
+    { 0, NULL, " \tfoo\t\tbar ", 0, 2, { "foo", "bar", }, IFS },
+    { 0, NULL, "red , white blue", 0, 4, { "red", ",", "white", "blue", }, " ," },
+    { 0, NULL, "one two three", 0, 3, { "one", "two", "three", }, "" },
+    { 0, NULL, "one \"two three\"", 0, 2, { "one", "two three", }, IFS },
+    { 0, NULL, "one \"two three\"", 0, 2, { "one", "two three", }, "" },
+    { 0, "two three", "one \"$var\"", 0, 2, { "one", "two three", }, IFS },
+    { 0, "two three", "one $var", 0, 3, { "one", "two", "three", }, IFS },
+    { 0, "two three", "one \"$var\"", 0, 2, { "one", "two three", }, "" },
+    { 0, "two three", "one $var", 0, 2, { "one", "two three", }, "" },
+
+    /* The non-whitespace IFS char at the end delimits the second field
+     * but does NOT start a new field. */
+    { 0, ":abc:", "$var", 0, 2, { "", "abc", }, ":" },
+
+    { 0, NULL, "$(echo :abc:)", 0, 2, { "", "abc", }, ":" },
+    { 0, NULL, "$(echo :abc:\\ )", 0, 2, { "", "abc", }, ": " },
+    { 0, NULL, "$(echo :abc\\ )", 0, 2, { "", "abc", }, ": " },
+    { 0, ":abc:", "$(echo $var)", 0, 2, { "", "abc", }, ":" },
+    { 0, NULL, ":abc:", 0, 1, { ":abc:", }, ":" },
+    { 0, NULL, "$(echo :abc:)def", 0, 3, { "", "abc", "def", },
+      ":" },
+    { 0, NULL, "$(echo abc:de)f", 0, 2, { "abc", "def", }, ":" },
+    { 0, NULL, "$(echo abc:de)f:ghi", 0, 2, { "abc", "def:ghi", },
+      ":" },
+    { 0, NULL, "abc:d$(echo ef:ghi)", 0, 2, { "abc:def", "ghi", },
+      ":" },
+    { 0, "abc:", "$var$(echo def:ghi)", 0, 3, { "abc", "def",
+							  "ghi", }, ":" },
+    { 0, "abc:d", "$var$(echo ef:ghi)", 0, 3, { "abc", "def",
+							  "ghi", }, ":" },
+    { 0, "def:ghi", "$(echo abc:)$var", 0, 3, { "abc", "def",
+							  "ghi", }, ":" },
+    { 0, "ef:ghi", "$(echo abc:d)$var", 0, 3, { "abc", "def",
+							  "ghi", }, ":" },
+
+    /* Simple parameter expansion */
+    { 0, "foo", "${var}", 0, 1, { "foo", }, IFS },
+    { 0, "foo", "$var", 0, 1, { "foo", }, IFS },
+    { 0, "foo", "\\\"$var\\\"", 0, 1, { "\"foo\"", }, IFS },
+    { 0, "foo", "%$var%", 0, 1, { "%foo%", }, IFS },
+    { 0, "foo", "-$var-", 0, 1, { "-foo-", }, IFS },
+
+    /* Simple quote removal */
+    { 0, NULL, "\"quoted\"", 0, 1, { "quoted", }, IFS },
+    { 0, "foo", "\"$var\"\"$var\"", 0, 1, { "foofoo", }, IFS },
+    { 0, NULL, "'singly-quoted'", 0, 1, { "singly-quoted", }, IFS },
+    { 0, NULL, "contin\\\nuation", 0, 1, { "continuation", }, IFS },
+    { 0, NULL, "explicit ''", 0, 2, { "explicit", "", }, IFS },
+    { 0, NULL, "explicit \"\"", 0, 2, { "explicit", "", }, IFS },
+    { 0, NULL, "explicit ``", 0, 1, { "explicit", }, IFS },
+
+    /* Simple command substitution */
+    { 0, NULL, "$(echo hello)", 0, 1, { "hello", }, IFS },
+    { 0, NULL, "$( (echo hello) )", 0, 1, { "hello", }, IFS },
+    { 0, NULL, "$((echo hello);(echo there))", 0, 2, { "hello", "there", }, IFS },
+    { 0, NULL, "`echo one two`", 0, 2, { "one", "two", }, IFS },
+    { 0, NULL, "$(echo ')')", 0, 1, { ")" }, IFS },
+    { 0, NULL, "$(echo hello; echo)", 0, 1, { "hello", }, IFS },
+    { 0, NULL, "a$(echo b)c", 0, 1, { "abc", }, IFS },
+
+    /* Simple arithmetic expansion */
+    { 0, NULL, "$((1 + 1))", 0, 1, { "2", }, IFS },
+    { 0, NULL, "$((2-3))", 0, 1, { "-1", }, IFS },
+    { 0, NULL, "$((-1))", 0, 1, { "-1", }, IFS },
+    { 0, NULL, "$[50+20]", 0, 1, { "70", }, IFS },
+    { 0, NULL, "$(((2+3)*(4+5)))", 0, 1, { "45", }, IFS },
+    { 0, NULL, "$((010))", 0, 1, { "8" }, IFS },
+    { 0, NULL, "$((0x10))", 0, 1, { "16" }, IFS },
+    { 0, NULL, "$((010+0x10))", 0, 1, { "24" }, IFS },
+    { 0, NULL, "$((-010+0x10))", 0, 1, { "8" }, IFS },
+    { 0, NULL, "$((-0x10+010))", 0, 1, { "-8" }, IFS },
+
+    /* Advanced parameter expansion */
+    { 0, NULL, "${var:-bar}", 0, 1, { "bar", }, IFS },
+    { 0, NULL, "${var-bar}", 0, 1, { "bar", }, IFS },
+    { 0, "", "${var:-bar}", 0, 1, { "bar", }, IFS },
+    { 0, "foo", "${var:-bar}", 0, 1, { "foo", }, IFS },
+    { 0, "", "${var-bar}", 0, 0, { NULL, }, IFS },
+    { 0, NULL, "${var:=bar}", 0, 1, { "bar", }, IFS },
+    { 0, NULL, "${var=bar}", 0, 1, { "bar", }, IFS },
+    { 0, "", "${var:=bar}", 0, 1, { "bar", }, IFS },
+    { 0, "foo", "${var:=bar}", 0, 1, { "foo", }, IFS },
+    { 0, "", "${var=bar}", 0, 0, { NULL, }, IFS },
+    { 0, "foo", "${var:?bar}", 0, 1, { "foo", }, IFS },
+    { 0, NULL, "${var:+bar}", 0, 0, { NULL, }, IFS },
+    { 0, NULL, "${var+bar}", 0, 0, { NULL, }, IFS },
+    { 0, "", "${var:+bar}", 0, 0, { NULL, }, IFS },
+    { 0, "foo", "${var:+bar}", 0, 1, { "bar", }, IFS },
+    { 0, "", "${var+bar}", 0, 1, { "bar", }, IFS },
+    { 0, "12345", "${#var}", 0, 1, { "5", }, IFS },
+    { 0, NULL, "${var:-'}'}", 0, 1, { "}", }, IFS },
+    { 0, NULL, "${var-}", 0, 0, { NULL }, IFS },
+
+    { 0, "pizza", "${var#${var}}", 0, 0, { NULL }, IFS },
+    { 0, "pepperoni", "${var%$(echo oni)}", 0, 1, { "pepper" }, IFS },
+    { 0, "6pack", "${var#$((6))}", 0, 1, { "pack" }, IFS },
+    { 0, "b*witched", "${var##b*}", 0, 0, { NULL }, IFS },
+    { 0, "b*witched", "${var##\"b*\"}", 0, 1, { "witched" }, IFS },
+    { 0, "banana", "${var%na*}", 0, 1, { "bana", }, IFS },
+    { 0, "banana", "${var%%na*}", 0, 1, { "ba", }, IFS },
+    { 0, "borabora-island", "${var#*bora}", 0, 1, { "bora-island", }, IFS },
+    { 0, "borabora-island", "${var##*bora}", 0, 1, { "-island", }, IFS },
+    { 0, "coconut", "${var##\\*co}", 0, 1, { "coconut", }, IFS },
+    { 0, "100%", "${var%0%}", 0, 1, { "10" }, IFS },
+
+    /* Pathname expansion */
+    { 0, NULL, "???", 0, 2, { "one", "two", }, IFS },
+    { 0, NULL, "[ot]??", 0, 2, { "one", "two", }, IFS },
+    { 0, NULL, "t*", 0, 2, { "three", "two", }, IFS },
+    { 0, NULL, "\"t\"*", 0, 2, { "three", "two", }, IFS },
+
+    /* Nested constructs */
+    { 0, "one two", "$var", 0, 2, { "one", "two", }, IFS },
+    { 0, "one two three", "$var", 0, 3, { "one", "two", "three", }, IFS },
+    { 0, " \tfoo\t\tbar ", "$var", 0, 2, { "foo", "bar", }, IFS },
+    { 0, "  red  , white blue", "$var", 0, 3, { "red", "white", "blue", }, ", \n\t" },
+    { 0, "  red  , white blue", "\"$var\"", 0, 1, { "  red  , white blue", }, ", \n\t" },
+    { 0, NULL, "\"$(echo hello there)\"", 0, 1, { "hello there", }, IFS },
+    { 0, NULL, "\"$(echo \"hello there\")\"", 0, 1, { "hello there", }, IFS },
+    { 0, NULL, "${var=one two} \"$var\"", 0, 3, { "one", "two", "one two", }, IFS },
+    { 0, "1", "$(( $(echo 3)+$var ))", 0, 1, { "4", }, IFS },
+    { 0, NULL, "\"$(echo \"*\")\"", 0, 1, { "*", }, IFS },
+    { 0, NULL, "\"a\n\n$(echo)b\"", 0, 1, { "a\n\nb", }, IFS },
+    { 0, "foo", "*$var*", 0, 1, { "*foo*", }, IFS },
+    { 0, "o thr", "*$var*", 0, 2, { "two", "three" }, IFS },
+
+    /* Different IFS values */
+    { 0, "a b\tc\nd  ", "$var", 0, 4, { "a", "b", "c", "d" }, NULL /* unset */ },
+    { 0, "a b\tc d  ", "$var", 0, 1, { "a b\tc d  " }, "" /* `null' */ },
+    { 0, "a,b c\n, d", "$var", 0, 3, { "a", "b c", " d" }, "\t\n," },
+
+    /* Other things that should succeed */
+    { 0, NULL, "\\*\"|&;<>\"\\(\\)\\{\\}", 0, 1, { "*|&;<>(){}", }, IFS },
+    { 0, "???", "$var", 0, 1, { "???", }, IFS },
+    { 0, NULL, "$var", 0, 0, { NULL, }, IFS },
+    { 0, NULL, "\"\\n\"", 0, 1, { "\\n", }, IFS },
+    { 0, NULL, "", 0, 0, { NULL, }, IFS },
+
+    /* Flags not already covered (testit() has special handling for these) */
+    { 0, NULL, "one two", WRDE_DOOFFS, 2, { "one", "two", }, IFS },
+    { 0, NULL, "appended", WRDE_APPEND, 3, { "pre1", "pre2", "appended", }, IFS },
+    { 0, NULL, "appended", WRDE_DOOFFS|WRDE_APPEND, 3, { "pre1", "pre2", "appended", }, IFS },
+
+    /* Things that should fail */
+    { WRDE_BADCHAR, NULL, "new\nline", 0, 0, { NULL, }, "" /* \n not IFS */ },
+    { WRDE_BADCHAR, NULL, "pipe|symbol", 0, 0, { NULL, }, IFS },
+    { WRDE_BADCHAR, NULL, "&ampersand", 0, 0, { NULL, }, IFS },
+    { WRDE_BADCHAR, NULL, "semi;colon", 0, 0, { NULL, }, IFS },
+    { WRDE_BADCHAR, NULL, "<greater", 0, 0, { NULL, }, IFS },
+    { WRDE_BADCHAR, NULL, "less>", 0, 0, { NULL, }, IFS },
+    { WRDE_BADCHAR, NULL, "(open-paren", 0, 0, { NULL, }, IFS },
+    { WRDE_BADCHAR, NULL, "close-paren)", 0, 0, { NULL, }, IFS },
+    { WRDE_BADCHAR, NULL, "{open-brace", 0, 0, { NULL, }, IFS },
+    { WRDE_BADCHAR, NULL, "close-brace}", 0, 0, { NULL, }, IFS },
+    { WRDE_CMDSUB, NULL, "$(ls)", WRDE_NOCMD, 0, { NULL, }, IFS },
+    { WRDE_BADVAL, NULL, "$var", WRDE_UNDEF, 0, { NULL, }, IFS },
+    { WRDE_BADVAL, NULL, "$9", WRDE_UNDEF, 0, { NULL, }, IFS },
+    { WRDE_SYNTAX, NULL, "$[50+20))", 0, 0, { NULL, }, IFS },
+    { WRDE_SYNTAX, NULL, "${%%noparam}", 0, 0, { NULL, }, IFS },
+    { WRDE_SYNTAX, NULL, "${missing-brace", 0, 0, { NULL, }, IFS },
+    { WRDE_SYNTAX, NULL, "$(for i in)", 0, 0, { NULL, }, IFS },
+    { WRDE_SYNTAX, NULL, "$((2+))", 0, 0, { NULL, }, IFS },
+    { WRDE_SYNTAX, NULL, "`", 0, 0, { NULL, }, IFS },
+    { WRDE_SYNTAX, NULL, "$((010+4+))", 0, 0, { NULL }, IFS },
+    /* Test for CVE-2014-7817. We test 3 combinations of command
+       substitution inside an arithmetic expression to make sure that
+       no commands are executed and error is returned.  */
+    { WRDE_CMDSUB, NULL, "$((`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS },
+    { WRDE_CMDSUB, NULL, "$((1+`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS },
+    { WRDE_CMDSUB, NULL, "$((1+$((`echo 1`))))", WRDE_NOCMD, 0, { NULL, }, IFS },
+
+    { WRDE_SYNTAX, NULL, "`\\", 0, 0, { NULL, }, IFS },     /* BZ 18042  */
+    { WRDE_SYNTAX, NULL, "${", 0, 0, { NULL, }, IFS },      /* BZ 18043  */
+    { WRDE_SYNTAX, NULL, "L${a:", 0, 0, { NULL, }, IFS },   /* BZ 18043#c4  */
+    { WRDE_SYNTAX, NULL, "$[1/0]", WRDE_NOCMD, 0, {NULL, }, IFS }, /* BZ 18100 */
+
+    { -1, NULL, NULL, 0, 0, { NULL, }, IFS },
+  };
+
+static int testit (struct test_case_struct *tc);
+static int tests;
+
+static void
+command_line_test (const char *words)
+{
+  wordexp_t we;
+  int i;
+  int retval = wordexp (words, &we, 0);
+  printf ("wordexp returned %d\n", retval);
+  for (i = 0; i < we.we_wordc; i++)
+    printf ("we_wordv[%d] = \"%s\"\n", i, we.we_wordv[i]);
+}
+
+int
+main (int argc, char *argv[])
+{
+  const char *globfile[] = { "one", "two", "three", NULL };
+  char tmpdir[32];
+  struct passwd *pw;
+  const char *cwd;
+  int test;
+  int fail = 0;
+  int i;
+  struct test_case_struct ts;
+
+  if (argc > 1)
+    {
+      command_line_test (argv[1]);
+      return 0;
+    }
+
+  cwd = getcwd (NULL, 0);
+
+  /* Set up arena for pathname expansion */
+  tmpnam (tmpdir);
+  if (mkdir (tmpdir, S_IRWXU) || chdir (tmpdir))
+    return -1;
+  else
+    {
+      int fd;
+
+      for (i = 0; globfile[i]; ++i)
+	if ((fd = creat (globfile[i], S_IRUSR | S_IWUSR)) == -1
+	    || close (fd))
+	  return -1;
+    }
+
+  /* If we are not allowed to do command substitution, we install
+     fork handlers to verify that no forks happened.  No forks should
+     happen at all if command substitution is disabled.  */
+  if (__app_register_atfork (register_fork, NULL, NULL) != 0)
+    {
+      printf ("Failed to register fork handler.\n");
+      return -1;
+    }
+
+  for (test = 0; test_case[test].retval != -1; test++)
+    if (testit (&test_case[test]))
+      ++fail;
+
+  /* Tilde-expansion tests. */
+  pw = getpwnam ("root");
+  if (pw != NULL)
+    {
+      ts.retval = 0;
+      ts.env = NULL;
+      ts.words = "~root ";
+      ts.flags = 0;
+      ts.wordc = 1;
+      ts.wordv[0] = pw->pw_dir;
+      ts.ifs = IFS;
+
+      if (testit (&ts))
+	++fail;
+
+      ts.retval = 0;
+      ts.env = pw->pw_dir;
+      ts.words = "${var#~root}x";
+      ts.flags = 0;
+      ts.wordc = 1;
+      ts.wordv[0] = "x";
+      ts.ifs = IFS;
+
+      if (testit (&ts))
+	++fail;
+    }
+
+  /* "~" expands to value of $HOME when HOME is set */
+
+  setenv ("HOME", "/dummy/home", 1);
+  ts.retval = 0;
+  ts.env = NULL;
+  ts.words = "~ ~/foo";
+  ts.flags = 0;
+  ts.wordc = 2;
+  ts.wordv[0] = "/dummy/home";
+  ts.wordv[1] = "/dummy/home/foo";
+  ts.ifs = IFS;
+
+  if (testit (&ts))
+    ++fail;
+
+  /* "~" expands to home dir from passwd file if HOME is not set */
+
+  pw = getpwuid (getuid ());
+  if (pw != NULL)
+    {
+      unsetenv ("HOME");
+      ts.retval = 0;
+      ts.env = NULL;
+      ts.words = "~";
+      ts.flags = 0;
+      ts.wordc = 1;
+      ts.wordv[0] = pw->pw_dir;
+      ts.ifs = IFS;
+
+      if (testit (&ts))
+	++fail;
+    }
+
+  /* Integer overflow in division.  */
+  {
+    static const char *const numbers[] = {
+      "0",
+      "1",
+      "65536",
+      "2147483648",
+      "4294967296"
+      "9223372036854775808",
+      "18446744073709551616",
+      "170141183460469231731687303715884105728",
+      "340282366920938463463374607431768211456",
+      NULL
+    };
+
+    for (const char *const *num = numbers; *num; ++num)
+      {
+	wordexp_t p;
+	char pattern[256];
+	snprintf (pattern, sizeof (pattern), "$[(-%s)/(-1)]", *num);
+	int ret = wordexp (pattern, &p, WRDE_NOCMD);
+	if (ret == 0)
+	  {
+	    if (p.we_wordc != 1 || strcmp (p.we_wordv[0], *num) != 0)
+	      {
+		printf ("Integer overflow for \"%s\" failed", pattern);
+		++fail;
+	      }
+	    wordfree (&p);
+	  }
+	else if (ret != WRDE_SYNTAX)
+	  {
+	    printf ("Integer overflow for \"%s\" failed with %d",
+		    pattern, ret);
+	    ++fail;
+	  }
+      }
+  }
+
+  puts ("tests completed, now cleaning up");
+
+  /* Clean up */
+  for (i = 0; globfile[i]; ++i)
+    remove (globfile[i]);
+
+  if (cwd == NULL)
+    cwd = "..";
+
+  chdir (cwd);
+  rmdir (tmpdir);
+
+  printf ("tests failed: %d\n", fail);
+
+  return fail != 0;
+}
+
+static const char *
+at_page_end (const char *words)
+{
+  const int pagesize = getpagesize ();
+  char *start = mmap (0, 2 * pagesize, PROT_READ|PROT_WRITE,
+		      MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+
+  if (start == MAP_FAILED)
+    return start;
+
+  if (mprotect (start + pagesize, pagesize, PROT_NONE))
+    {
+      munmap (start, 2 * pagesize);
+      return MAP_FAILED;
+    }
+
+  /* Includes terminating NUL.  */
+  const size_t words_size = strlen (words) + 1;
+  char *words_start = start + pagesize - words_size;
+  memcpy (words_start, words, words_size);
+
+  return words_start;
+}
+
+static int
+testit (struct test_case_struct *tc)
+{
+  int retval;
+  wordexp_t we, sav_we;
+  char *dummy;
+  int bzzzt = 0;
+  int start_offs = 0;
+  int i;
+
+  if (tc->env)
+    setenv ("var", tc->env, 1);
+  else
+    unsetenv ("var");
+
+  if (tc->ifs)
+    setenv ("IFS", tc->ifs, 1);
+  else
+    unsetenv ("IFS");
+
+  sav_we.we_wordc = 99;
+  sav_we.we_wordv = &dummy;
+  sav_we.we_offs = 3;
+  we = sav_we;
+
+  printf ("Test %d (%s): ", ++tests, tc->words);
+  fflush (NULL);
+  const char *words = at_page_end (tc->words);
+
+  if (tc->flags & WRDE_NOCMD)
+    registered_forks = 0;
+
+  if (tc->flags & WRDE_APPEND)
+    {
+      /* initial wordexp() call, to be appended to */
+      if (wordexp ("pre1 pre2", &we, tc->flags & ~WRDE_APPEND) != 0)
+        {
+	  printf ("FAILED setup\n");
+	  return 1;
+	}
+    }
+  retval = wordexp (words, &we, tc->flags);
+
+  if ((tc->flags & WRDE_NOCMD)
+      && (registered_forks > 0))
+    {
+	  printf ("FAILED fork called for WRDE_NOCMD\n");
+	  return 1;
+    }
+
+  if (tc->flags & WRDE_DOOFFS)
+      start_offs = sav_we.we_offs;
+
+  if (retval != tc->retval || (retval == 0 && we.we_wordc != tc->wordc))
+    bzzzt = 1;
+  else if (retval == 0)
+    {
+      for (i = 0; i < start_offs; ++i)
+	if (we.we_wordv[i] != NULL)
+	  {
+	    bzzzt = 1;
+	    break;
+	  }
+
+      for (i = 0; i < we.we_wordc; ++i)
+	if (we.we_wordv[i+start_offs] == NULL ||
+	    strcmp (tc->wordv[i], we.we_wordv[i+start_offs]) != 0)
+	  {
+	    bzzzt = 1;
+	    break;
+	  }
+    }
+
+  if (bzzzt)
+    {
+      printf ("FAILED\n");
+      printf ("Test words: <%s>, need retval %d, wordc %Zd\n",
+	      tc->words, tc->retval, tc->wordc);
+      if (start_offs != 0)
+	printf ("(preceded by %d NULLs)\n", start_offs);
+      printf ("Got retval %d, wordc %Zd: ", retval, we.we_wordc);
+      if (retval == 0 || retval == WRDE_NOSPACE)
+	{
+	  for (i = 0; i < we.we_wordc + start_offs; ++i)
+	    if (we.we_wordv[i] == NULL)
+	      printf ("NULL ");
+	    else
+	      printf ("<%s> ", we.we_wordv[i]);
+	}
+      printf ("\n");
+    }
+  else if (retval != 0 && retval != WRDE_NOSPACE &&
+	   (we.we_wordc != sav_we.we_wordc ||
+            we.we_wordv != sav_we.we_wordv ||
+            we.we_offs != sav_we.we_offs))
+    {
+      bzzzt = 1;
+      printf ("FAILED to restore wordexp_t members\n");
+    }
+  else
+    printf ("OK\n");
+
+  if (retval == 0 || retval == WRDE_NOSPACE)
+    wordfree (&we);
+
+  const int page_size = getpagesize ();
+  char *start = (char *) PTR_ALIGN_DOWN (words, page_size);
+
+  if (munmap (start, 2 * page_size) != 0)
+    return 1;
+
+  fflush (NULL);
+  return bzzzt;
+}