posix/wordexp-test.c

   1 /* Copyright (C) 1997-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sys/stat.h>
  19 #include <sys/types.h>
  20 #include <sys/mman.h>
  21 #include <fcntl.h>
  22 #include <unistd.h>
  23 #include <pwd.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <wordexp.h>
  28 #include <libc-internal.h>
  29
  30 #define IFS " \n\t"
  31
  32 extern void *__dso_handle __attribute__ ((__weak__, __visibility__ ("hidden")));
  33 extern int __register_atfork (void (*) (void), void (*) (void), void (*) (void), void *);
  34
  35 static int __app_register_atfork (void (*prepare) (void), void (*parent) (void), void (*child) (void))
  36 {
  37   return __register_atfork (prepare, parent, child,
  38                             &__dso_handle == NULL ? NULL : __dso_handle);
  39 }
  40
  41 /* Number of forks seen.  */
  42 static int registered_forks;
  43
  44 /* For each fork increment the fork count.  */
  45 static void
  46 register_fork (void)
  47 {
  48   registered_forks++;
  49 }
  50
  51 struct test_case_struct
  52 {
  53   int retval;
  54   const char *env;
  55   const char *words;
  56   int flags;
  57   size_t wordc;
  58   const char *wordv[10];
  59   const char *ifs;
  60 } test_case[] =
  61   {
  62     /* Simple word- and field-splitting */
  63     { 0, NULL, "one", 0, 1, { "one", }, IFS },
  64     { 0, NULL, "one two", 0, 2, { "one", "two", }, IFS },
  65     { 0, NULL, "one two three", 0, 3, { "one", "two", "three", }, IFS },
  66     { 0, NULL, " \tfoo\t\tbar ", 0, 2, { "foo", "bar", }, IFS },
  67     { 0, NULL, "red , white blue", 0, 4, { "red", ",", "white", "blue", }, " ," },
  68     { 0, NULL, "one two three", 0, 3, { "one", "two", "three", }, "" },
  69     { 0, NULL, "one \"two three\"", 0, 2, { "one", "two three", }, IFS },
  70     { 0, NULL, "one \"two three\"", 0, 2, { "one", "two three", }, "" },
  71     { 0, "two three", "one \"$var\"", 0, 2, { "one", "two three", }, IFS },
  72     { 0, "two three", "one $var", 0, 3, { "one", "two", "three", }, IFS },
  73     { 0, "two three", "one \"$var\"", 0, 2, { "one", "two three", }, "" },
  74     { 0, "two three", "one $var", 0, 2, { "one", "two three", }, "" },
  75
  76     /* The non-whitespace IFS char at the end delimits the second field
  77      * but does NOT start a new field. */
  78     { 0, ":abc:", "$var", 0, 2, { "", "abc", }, ":" },
  79
  80     { 0, NULL, "$(echo :abc:)", 0, 2, { "", "abc", }, ":" },
  81     { 0, NULL, "$(echo :abc:\\ )", 0, 2, { "", "abc", }, ": " },
  82     { 0, NULL, "$(echo :abc\\ )", 0, 2, { "", "abc", }, ": " },
  83     { 0, ":abc:", "$(echo $var)", 0, 2, { "", "abc", }, ":" },
  84     { 0, NULL, ":abc:", 0, 1, { ":abc:", }, ":" },
  85     { 0, NULL, "$(echo :abc:)def", 0, 3, { "", "abc", "def", },
  86       ":" },
  87     { 0, NULL, "$(echo abc:de)f", 0, 2, { "abc", "def", }, ":" },
  88     { 0, NULL, "$(echo abc:de)f:ghi", 0, 2, { "abc", "def:ghi", },
  89       ":" },
  90     { 0, NULL, "abc:d$(echo ef:ghi)", 0, 2, { "abc:def", "ghi", },
  91       ":" },
  92     { 0, "abc:", "$var$(echo def:ghi)", 0, 3, { "abc", "def",
  93                                                           "ghi", }, ":" },
  94     { 0, "abc:d", "$var$(echo ef:ghi)", 0, 3, { "abc", "def",
  95                                                           "ghi", }, ":" },
  96     { 0, "def:ghi", "$(echo abc:)$var", 0, 3, { "abc", "def",
  97                                                           "ghi", }, ":" },
  98     { 0, "ef:ghi", "$(echo abc:d)$var", 0, 3, { "abc", "def",
  99                                                           "ghi", }, ":" },
 100
 101     /* Simple parameter expansion */
 102     { 0, "foo", "${var}", 0, 1, { "foo", }, IFS },
 103     { 0, "foo", "$var", 0, 1, { "foo", }, IFS },
 104     { 0, "foo", "\\\"$var\\\"", 0, 1, { "\"foo\"", }, IFS },
 105     { 0, "foo", "%$var%", 0, 1, { "%foo%", }, IFS },
 106     { 0, "foo", "-$var-", 0, 1, { "-foo-", }, IFS },
 107
 108     /* Simple quote removal */
 109     { 0, NULL, "\"quoted\"", 0, 1, { "quoted", }, IFS },
 110     { 0, "foo", "\"$var\"\"$var\"", 0, 1, { "foofoo", }, IFS },
 111     { 0, NULL, "'singly-quoted'", 0, 1, { "singly-quoted", }, IFS },
 112     { 0, NULL, "contin\\\nuation", 0, 1, { "continuation", }, IFS },
 113     { 0, NULL, "explicit ''", 0, 2, { "explicit", "", }, IFS },
 114     { 0, NULL, "explicit \"\"", 0, 2, { "explicit", "", }, IFS },
 115     { 0, NULL, "explicit ``", 0, 1, { "explicit", }, IFS },
 116
 117     /* Simple command substitution */
 118     { 0, NULL, "$(echo hello)", 0, 1, { "hello", }, IFS },
 119     { 0, NULL, "$( (echo hello) )", 0, 1, { "hello", }, IFS },
 120     { 0, NULL, "$((echo hello);(echo there))", 0, 2, { "hello", "there", }, IFS },
 121     { 0, NULL, "`echo one two`", 0, 2, { "one", "two", }, IFS },
 122     { 0, NULL, "$(echo ')')", 0, 1, { ")" }, IFS },
 123     { 0, NULL, "$(echo hello; echo)", 0, 1, { "hello", }, IFS },
 124     { 0, NULL, "a$(echo b)c", 0, 1, { "abc", }, IFS },
 125
 126     /* Simple arithmetic expansion */
 127     { 0, NULL, "$((1 + 1))", 0, 1, { "2", }, IFS },
 128     { 0, NULL, "$((2-3))", 0, 1, { "-1", }, IFS },
 129     { 0, NULL, "$((-1))", 0, 1, { "-1", }, IFS },
 130     { 0, NULL, "$[50+20]", 0, 1, { "70", }, IFS },
 131     { 0, NULL, "$(((2+3)*(4+5)))", 0, 1, { "45", }, IFS },
 132     { 0, NULL, "$((010))", 0, 1, { "8" }, IFS },
 133     { 0, NULL, "$((0x10))", 0, 1, { "16" }, IFS },
 134     { 0, NULL, "$((010+0x10))", 0, 1, { "24" }, IFS },
 135     { 0, NULL, "$((-010+0x10))", 0, 1, { "8" }, IFS },
 136     { 0, NULL, "$((-0x10+010))", 0, 1, { "-8" }, IFS },
 137
 138     /* Advanced parameter expansion */
 139     { 0, NULL, "${var:-bar}", 0, 1, { "bar", }, IFS },
 140     { 0, NULL, "${var-bar}", 0, 1, { "bar", }, IFS },
 141     { 0, "", "${var:-bar}", 0, 1, { "bar", }, IFS },
 142     { 0, "foo", "${var:-bar}", 0, 1, { "foo", }, IFS },
 143     { 0, "", "${var-bar}", 0, 0, { NULL, }, IFS },
 144     { 0, NULL, "${var:=bar}", 0, 1, { "bar", }, IFS },
 145     { 0, NULL, "${var=bar}", 0, 1, { "bar", }, IFS },
 146     { 0, "", "${var:=bar}", 0, 1, { "bar", }, IFS },
 147     { 0, "foo", "${var:=bar}", 0, 1, { "foo", }, IFS },
 148     { 0, "", "${var=bar}", 0, 0, { NULL, }, IFS },
 149     { 0, "foo", "${var:?bar}", 0, 1, { "foo", }, IFS },
 150     { 0, NULL, "${var:+bar}", 0, 0, { NULL, }, IFS },
 151     { 0, NULL, "${var+bar}", 0, 0, { NULL, }, IFS },
 152     { 0, "", "${var:+bar}", 0, 0, { NULL, }, IFS },
 153     { 0, "foo", "${var:+bar}", 0, 1, { "bar", }, IFS },
 154     { 0, "", "${var+bar}", 0, 1, { "bar", }, IFS },
 155     { 0, "12345", "${#var}", 0, 1, { "5", }, IFS },
 156     { 0, NULL, "${var:-'}'}", 0, 1, { "}", }, IFS },
 157     { 0, NULL, "${var-}", 0, 0, { NULL }, IFS },
 158
 159     { 0, "pizza", "${var#${var}}", 0, 0, { NULL }, IFS },
 160     { 0, "pepperoni", "${var%$(echo oni)}", 0, 1, { "pepper" }, IFS },
 161     { 0, "6pack", "${var#$((6))}", 0, 1, { "pack" }, IFS },
 162     { 0, "b*witched", "${var##b*}", 0, 0, { NULL }, IFS },
 163     { 0, "b*witched", "${var##\"b*\"}", 0, 1, { "witched" }, IFS },
 164     { 0, "banana", "${var%na*}", 0, 1, { "bana", }, IFS },
 165     { 0, "banana", "${var%%na*}", 0, 1, { "ba", }, IFS },
 166     { 0, "borabora-island", "${var#*bora}", 0, 1, { "bora-island", }, IFS },
 167     { 0, "borabora-island", "${var##*bora}", 0, 1, { "-island", }, IFS },
 168     { 0, "coconut", "${var##\\*co}", 0, 1, { "coconut", }, IFS },
 169     { 0, "100%", "${var%0%}", 0, 1, { "10" }, IFS },
 170
 171     /* Pathname expansion */
 172     { 0, NULL, "???", 0, 2, { "one", "two", }, IFS },
 173     { 0, NULL, "[ot]??", 0, 2, { "one", "two", }, IFS },
 174     { 0, NULL, "t*", 0, 2, { "three", "two", }, IFS },
 175     { 0, NULL, "\"t\"*", 0, 2, { "three", "two", }, IFS },
 176
 177     /* Nested constructs */
 178     { 0, "one two", "$var", 0, 2, { "one", "two", }, IFS },
 179     { 0, "one two three", "$var", 0, 3, { "one", "two", "three", }, IFS },
 180     { 0, " \tfoo\t\tbar ", "$var", 0, 2, { "foo", "bar", }, IFS },
 181     { 0, "  red  , white blue", "$var", 0, 3, { "red", "white", "blue", }, ", \n\t" },
 182     { 0, "  red  , white blue", "\"$var\"", 0, 1, { "  red  , white blue", }, ", \n\t" },
 183     { 0, NULL, "\"$(echo hello there)\"", 0, 1, { "hello there", }, IFS },
 184     { 0, NULL, "\"$(echo \"hello there\")\"", 0, 1, { "hello there", }, IFS },
 185     { 0, NULL, "${var=one two} \"$var\"", 0, 3, { "one", "two", "one two", }, IFS },
 186     { 0, "1", "$(( $(echo 3)+$var ))", 0, 1, { "4", }, IFS },
 187     { 0, NULL, "\"$(echo \"*\")\"", 0, 1, { "*", }, IFS },
 188     { 0, NULL, "\"a\n\n$(echo)b\"", 0, 1, { "a\n\nb", }, IFS },
 189     { 0, "foo", "*$var*", 0, 1, { "*foo*", }, IFS },
 190     { 0, "o thr", "*$var*", 0, 2, { "two", "three" }, IFS },
 191
 192     /* Different IFS values */
 193     { 0, "a b\tc\nd  ", "$var", 0, 4, { "a", "b", "c", "d" }, NULL /* unset */ },
 194     { 0, "a b\tc d  ", "$var", 0, 1, { "a b\tc d  " }, "" /* `null' */ },
 195     { 0, "a,b c\n, d", "$var", 0, 3, { "a", "b c", " d" }, "\t\n," },
 196
 197     /* Other things that should succeed */
 198     { 0, NULL, "\\*\"|&;<>\"\\(\\)\\{\\}", 0, 1, { "*|&;<>(){}", }, IFS },
 199     { 0, "???", "$var", 0, 1, { "???", }, IFS },
 200     { 0, NULL, "$var", 0, 0, { NULL, }, IFS },
 201     { 0, NULL, "\"\\n\"", 0, 1, { "\\n", }, IFS },
 202     { 0, NULL, "", 0, 0, { NULL, }, IFS },
 203
 204     /* Flags not already covered (testit() has special handling for these) */
 205     { 0, NULL, "one two", WRDE_DOOFFS, 2, { "one", "two", }, IFS },
 206     { 0, NULL, "appended", WRDE_APPEND, 3, { "pre1", "pre2", "appended", }, IFS },
 207     { 0, NULL, "appended", WRDE_DOOFFS|WRDE_APPEND, 3, { "pre1", "pre2", "appended", }, IFS },
 208
 209     /* Things that should fail */
 210     { WRDE_BADCHAR, NULL, "new\nline", 0, 0, { NULL, }, "" /* \n not IFS */ },
 211     { WRDE_BADCHAR, NULL, "pipe|symbol", 0, 0, { NULL, }, IFS },
 212     { WRDE_BADCHAR, NULL, "&ampersand", 0, 0, { NULL, }, IFS },
 213     { WRDE_BADCHAR, NULL, "semi;colon", 0, 0, { NULL, }, IFS },
 214     { WRDE_BADCHAR, NULL, "<greater", 0, 0, { NULL, }, IFS },
 215     { WRDE_BADCHAR, NULL, "less>", 0, 0, { NULL, }, IFS },
 216     { WRDE_BADCHAR, NULL, "(open-paren", 0, 0, { NULL, }, IFS },
 217     { WRDE_BADCHAR, NULL, "close-paren)", 0, 0, { NULL, }, IFS },
 218     { WRDE_BADCHAR, NULL, "{open-brace", 0, 0, { NULL, }, IFS },
 219     { WRDE_BADCHAR, NULL, "close-brace}", 0, 0, { NULL, }, IFS },
 220     { WRDE_CMDSUB, NULL, "$(ls)", WRDE_NOCMD, 0, { NULL, }, IFS },
 221     { WRDE_BADVAL, NULL, "$var", WRDE_UNDEF, 0, { NULL, }, IFS },
 222     { WRDE_BADVAL, NULL, "$9", WRDE_UNDEF, 0, { NULL, }, IFS },
 223     { WRDE_SYNTAX, NULL, "$[50+20))", 0, 0, { NULL, }, IFS },
 224     { WRDE_SYNTAX, NULL, "${%%noparam}", 0, 0, { NULL, }, IFS },
 225     { WRDE_SYNTAX, NULL, "${missing-brace", 0, 0, { NULL, }, IFS },
 226     { WRDE_SYNTAX, NULL, "$(for i in)", 0, 0, { NULL, }, IFS },
 227     { WRDE_SYNTAX, NULL, "$((2+))", 0, 0, { NULL, }, IFS },
 228     { WRDE_SYNTAX, NULL, "`", 0, 0, { NULL, }, IFS },
 229     { WRDE_SYNTAX, NULL, "$((010+4+))", 0, 0, { NULL }, IFS },
 230     /* Test for CVE-2014-7817. We test 3 combinations of command
 231        substitution inside an arithmetic expression to make sure that
 232        no commands are executed and error is returned.  */
 233     { WRDE_CMDSUB, NULL, "$((`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS },
 234     { WRDE_CMDSUB, NULL, "$((1+`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS },
 235     { WRDE_CMDSUB, NULL, "$((1+$((`echo 1`))))", WRDE_NOCMD, 0, { NULL, }, IFS },
 236
 237     { WRDE_SYNTAX, NULL, "`\\", 0, 0, { NULL, }, IFS },     /* BZ 18042  */
 238     { WRDE_SYNTAX, NULL, "${", 0, 0, { NULL, }, IFS },      /* BZ 18043  */
 239     { WRDE_SYNTAX, NULL, "L${a:", 0, 0, { NULL, }, IFS },   /* BZ 18043#c4  */
 240     { WRDE_SYNTAX, NULL, "$[1/0]", WRDE_NOCMD, 0, {NULL, }, IFS }, /* BZ 18100 */
 241
 242     { -1, NULL, NULL, 0, 0, { NULL, }, IFS },
 243   };
 244
 245 static int testit (struct test_case_struct *tc);
 246 static int tests;
 247
 248 static void
 249 command_line_test (const char *words)
 250 {
 251   wordexp_t we;
 252   int i;
 253   int retval = wordexp (words, &we, 0);
 254   printf ("wordexp returned %d\n", retval);
 255   for (i = 0; i < we.we_wordc; i++)
 256     printf ("we_wordv[%d] = \"%s\"\n", i, we.we_wordv[i]);
 257 }
 258
 259 int
 260 main (int argc, char *argv[])
 261 {
 262   const char *globfile[] = { "one", "two", "three", NULL };
 263   char tmpdir[32];
 264   struct passwd *pw;
 265   const char *cwd;
 266   int test;
 267   int fail = 0;
 268   int i;
 269   struct test_case_struct ts;
 270
 271   if (argc > 1)
 272     {
 273       command_line_test (argv[1]);
 274       return 0;
 275     }
 276
 277   cwd = getcwd (NULL, 0);
 278
 279   /* Set up arena for pathname expansion */
 280   tmpnam (tmpdir);
 281   if (mkdir (tmpdir, S_IRWXU) || chdir (tmpdir))
 282     return -1;
 283   else
 284     {
 285       int fd;
 286
 287       for (i = 0; globfile[i]; ++i)
 288         if ((fd = creat (globfile[i], S_IRUSR | S_IWUSR)) == -1
 289             || close (fd))
 290           return -1;
 291     }
 292
 293   /* If we are not allowed to do command substitution, we install
 294      fork handlers to verify that no forks happened.  No forks should
 295      happen at all if command substitution is disabled.  */
 296   if (__app_register_atfork (register_fork, NULL, NULL) != 0)
 297     {
 298       printf ("Failed to register fork handler.\n");
 299       return -1;
 300     }
 301
 302   for (test = 0; test_case[test].retval != -1; test++)
 303     if (testit (&test_case[test]))
 304       ++fail;
 305
 306   /* Tilde-expansion tests. */
 307   pw = getpwnam ("root");
 308   if (pw != NULL)
 309     {
 310       ts.retval = 0;
 311       ts.env = NULL;
 312       ts.words = "~root ";
 313       ts.flags = 0;
 314       ts.wordc = 1;
 315       ts.wordv[0] = pw->pw_dir;
 316       ts.ifs = IFS;
 317
 318       if (testit (&ts))
 319         ++fail;
 320
 321       ts.retval = 0;
 322       ts.env = pw->pw_dir;
 323       ts.words = "${var#~root}x";
 324       ts.flags = 0;
 325       ts.wordc = 1;
 326       ts.wordv[0] = "x";
 327       ts.ifs = IFS;
 328
 329       if (testit (&ts))
 330         ++fail;
 331     }
 332
 333   /* "~" expands to value of $HOME when HOME is set */
 334
 335   setenv ("HOME", "/dummy/home", 1);
 336   ts.retval = 0;
 337   ts.env = NULL;
 338   ts.words = "~ ~/foo";
 339   ts.flags = 0;
 340   ts.wordc = 2;
 341   ts.wordv[0] = "/dummy/home";
 342   ts.wordv[1] = "/dummy/home/foo";
 343   ts.ifs = IFS;
 344
 345   if (testit (&ts))
 346     ++fail;
 347
 348   /* "~" expands to home dir from passwd file if HOME is not set */
 349
 350   pw = getpwuid (getuid ());
 351   if (pw != NULL)
 352     {
 353       unsetenv ("HOME");
 354       ts.retval = 0;
 355       ts.env = NULL;
 356       ts.words = "~";
 357       ts.flags = 0;
 358       ts.wordc = 1;
 359       ts.wordv[0] = pw->pw_dir;
 360       ts.ifs = IFS;
 361
 362       if (testit (&ts))
 363         ++fail;
 364     }
 365
 366   /* Integer overflow in division.  */
 367   {
 368     static const char *const numbers[] = {
 369       "0",
 370       "1",
 371       "65536",
 372       "2147483648",
 373       "4294967296"
 374       "9223372036854775808",
 375       "18446744073709551616",
 376       "170141183460469231731687303715884105728",
 377       "340282366920938463463374607431768211456",
 378       NULL
 379     };
 380
 381     for (const char *const *num = numbers; *num; ++num)
 382       {
 383         wordexp_t p;
 384         char pattern[256];
 385         snprintf (pattern, sizeof (pattern), "$[(-%s)/(-1)]", *num);
 386         int ret = wordexp (pattern, &p, WRDE_NOCMD);
 387         if (ret == 0)
 388           {
 389             if (p.we_wordc != 1 || strcmp (p.we_wordv[0], *num) != 0)
 390               {
 391                 printf ("Integer overflow for \"%s\" failed", pattern);
 392                 ++fail;
 393               }
 394             wordfree (&p);
 395           }
 396         else if (ret != WRDE_SYNTAX)
 397           {
 398             printf ("Integer overflow for \"%s\" failed with %d",
 399                     pattern, ret);
 400             ++fail;
 401           }
 402       }
 403   }
 404
 405   puts ("tests completed, now cleaning up");
 406
 407   /* Clean up */
 408   for (i = 0; globfile[i]; ++i)
 409     remove (globfile[i]);
 410
 411   if (cwd == NULL)
 412     cwd = "..";
 413
 414   chdir (cwd);
 415   rmdir (tmpdir);
 416
 417   printf ("tests failed: %d\n", fail);
 418
 419   return fail != 0;
 420 }
 421
 422 static const char *
 423 at_page_end (const char *words)
 424 {
 425   const int pagesize = getpagesize ();
 426   char *start = mmap (0, 2 * pagesize, PROT_READ|PROT_WRITE,
 427                       MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
 428
 429   if (start == MAP_FAILED)
 430     return start;
 431
 432   if (mprotect (start + pagesize, pagesize, PROT_NONE))
 433     {
 434       munmap (start, 2 * pagesize);
 435       return MAP_FAILED;
 436     }
 437
 438   /* Includes terminating NUL.  */
 439   const size_t words_size = strlen (words) + 1;
 440   char *words_start = start + pagesize - words_size;
 441   memcpy (words_start, words, words_size);
 442
 443   return words_start;
 444 }
 445
 446 static int
 447 testit (struct test_case_struct *tc)
 448 {
 449   int retval;
 450   wordexp_t we, sav_we;
 451   char *dummy;
 452   int bzzzt = 0;
 453   int start_offs = 0;
 454   int i;
 455
 456   if (tc->env)
 457     setenv ("var", tc->env, 1);
 458   else
 459     unsetenv ("var");
 460
 461   if (tc->ifs)
 462     setenv ("IFS", tc->ifs, 1);
 463   else
 464     unsetenv ("IFS");
 465
 466   sav_we.we_wordc = 99;
 467   sav_we.we_wordv = &dummy;
 468   sav_we.we_offs = 3;
 469   we = sav_we;
 470
 471   printf ("Test %d (%s): ", ++tests, tc->words);
 472   fflush (NULL);
 473   const char *words = at_page_end (tc->words);
 474
 475   if (tc->flags & WRDE_NOCMD)
 476     registered_forks = 0;
 477
 478   if (tc->flags & WRDE_APPEND)
 479     {
 480       /* initial wordexp() call, to be appended to */
 481       if (wordexp ("pre1 pre2", &we, tc->flags & ~WRDE_APPEND) != 0)
 482         {
 483           printf ("FAILED setup\n");
 484           return 1;
 485         }
 486     }
 487   retval = wordexp (words, &we, tc->flags);
 488
 489   if ((tc->flags & WRDE_NOCMD)
 490       && (registered_forks > 0))
 491     {
 492           printf ("FAILED fork called for WRDE_NOCMD\n");
 493           return 1;
 494     }
 495
 496   if (tc->flags & WRDE_DOOFFS)
 497       start_offs = sav_we.we_offs;
 498
 499   if (retval != tc->retval || (retval == 0 && we.we_wordc != tc->wordc))
 500     bzzzt = 1;
 501   else if (retval == 0)
 502     {
 503       for (i = 0; i < start_offs; ++i)
 504         if (we.we_wordv[i] != NULL)
 505           {
 506             bzzzt = 1;
 507             break;
 508           }
 509
 510       for (i = 0; i < we.we_wordc; ++i)
 511         if (we.we_wordv[i+start_offs] == NULL ||
 512             strcmp (tc->wordv[i], we.we_wordv[i+start_offs]) != 0)
 513           {
 514             bzzzt = 1;
 515             break;
 516           }
 517     }
 518
 519   if (bzzzt)
 520     {
 521       printf ("FAILED\n");
 522       printf ("Test words: <%s>, need retval %d, wordc %Zd\n",
 523               tc->words, tc->retval, tc->wordc);
 524       if (start_offs != 0)
 525         printf ("(preceded by %d NULLs)\n", start_offs);
 526       printf ("Got retval %d, wordc %Zd: ", retval, we.we_wordc);
 527       if (retval == 0 || retval == WRDE_NOSPACE)
 528         {
 529           for (i = 0; i < we.we_wordc + start_offs; ++i)
 530             if (we.we_wordv[i] == NULL)
 531               printf ("NULL ");
 532             else
 533               printf ("<%s> ", we.we_wordv[i]);
 534         }
 535       printf ("\n");
 536     }
 537   else if (retval != 0 && retval != WRDE_NOSPACE &&
 538            (we.we_wordc != sav_we.we_wordc ||
 539             we.we_wordv != sav_we.we_wordv ||
 540             we.we_offs != sav_we.we_offs))
 541     {
 542       bzzzt = 1;
 543       printf ("FAILED to restore wordexp_t members\n");
 544     }
 545   else
 546     printf ("OK\n");
 547
 548   if (retval == 0 || retval == WRDE_NOSPACE)
 549     wordfree (&we);
 550
 551   const int page_size = getpagesize ();
 552   char *start = (char *) PTR_ALIGN_DOWN (words, page_size);
 553
 554   if (munmap (start, 2 * page_size) != 0)
 555     return 1;
 556
 557   fflush (NULL);
 558   return bzzzt;
 559 }