posix/wordexp-test.c

   1 /* Copyright (C) 1997-2017 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 <stdint.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <wordexp.h>
  29 #include <libc-pointer-arith.h>
  30
  31 #define IFS " \n\t"
  32
  33 extern void *__dso_handle __attribute__ ((__weak__, __visibility__ ("hidden")));
  34 extern int __register_atfork (void (*) (void), void (*) (void), void (*) (void), void *);
  35
  36 static int __app_register_atfork (void (*prepare) (void), void (*parent) (void), void (*child) (void))
  37 {
  38   return __register_atfork (prepare, parent, child,
  39                             &__dso_handle == NULL ? NULL : __dso_handle);
  40 }
  41
  42 /* Number of forks seen.  */
  43 static int registered_forks;
  44
  45 /* For each fork increment the fork count.  */
  46 static void
  47 register_fork (void)
  48 {
  49   registered_forks++;
  50 }
  51
  52 struct test_case_struct
  53 {
  54   int retval;
  55   const char *env;
  56   const char *words;
  57   int flags;
  58   size_t wordc;
  59   const char *wordv[10];
  60   const char *ifs;
  61 } test_case[] =
  62   {
  63     /* Simple word- and field-splitting */
  64     { 0, NULL, "one", 0, 1, { "one", }, IFS },
  65     { 0, NULL, "one two", 0, 2, { "one", "two", }, IFS },
  66     { 0, NULL, "one two three", 0, 3, { "one", "two", "three", }, IFS },
  67     { 0, NULL, " \tfoo\t\tbar ", 0, 2, { "foo", "bar", }, IFS },
  68     { 0, NULL, "red , white blue", 0, 4, { "red", ",", "white", "blue", }, " ," },
  69     { 0, NULL, "one two three", 0, 3, { "one", "two", "three", }, "" },
  70     { 0, NULL, "one \"two three\"", 0, 2, { "one", "two three", }, IFS },
  71     { 0, NULL, "one \"two three\"", 0, 2, { "one", "two three", }, "" },
  72     { 0, "two three", "one \"$var\"", 0, 2, { "one", "two three", }, IFS },
  73     { 0, "two three", "one $var", 0, 3, { "one", "two", "three", }, IFS },
  74     { 0, "two three", "one \"$var\"", 0, 2, { "one", "two three", }, "" },
  75     { 0, "two three", "one $var", 0, 2, { "one", "two three", }, "" },
  76
  77     /* The non-whitespace IFS char at the end delimits the second field
  78      * but does NOT start a new field. */
  79     { 0, ":abc:", "$var", 0, 2, { "", "abc", }, ":" },
  80
  81     { 0, NULL, "$(echo :abc:)", 0, 2, { "", "abc", }, ":" },
  82     { 0, NULL, "$(echo :abc:\\ )", 0, 2, { "", "abc", }, ": " },
  83     { 0, NULL, "$(echo :abc\\ )", 0, 2, { "", "abc", }, ": " },
  84     { 0, ":abc:", "$(echo $var)", 0, 2, { "", "abc", }, ":" },
  85     { 0, NULL, ":abc:", 0, 1, { ":abc:", }, ":" },
  86     { 0, NULL, "$(echo :abc:)def", 0, 3, { "", "abc", "def", },
  87       ":" },
  88     { 0, NULL, "$(echo abc:de)f", 0, 2, { "abc", "def", }, ":" },
  89     { 0, NULL, "$(echo abc:de)f:ghi", 0, 2, { "abc", "def:ghi", },
  90       ":" },
  91     { 0, NULL, "abc:d$(echo ef:ghi)", 0, 2, { "abc:def", "ghi", },
  92       ":" },
  93     { 0, "abc:", "$var$(echo def:ghi)", 0, 3, { "abc", "def",
  94                                                           "ghi", }, ":" },
  95     { 0, "abc:d", "$var$(echo ef:ghi)", 0, 3, { "abc", "def",
  96                                                           "ghi", }, ":" },
  97     { 0, "def:ghi", "$(echo abc:)$var", 0, 3, { "abc", "def",
  98                                                           "ghi", }, ":" },
  99     { 0, "ef:ghi", "$(echo abc:d)$var", 0, 3, { "abc", "def",
 100                                                           "ghi", }, ":" },
 101
 102     /* Simple parameter expansion */
 103     { 0, "foo", "${var}", 0, 1, { "foo", }, IFS },
 104     { 0, "foo", "$var", 0, 1, { "foo", }, IFS },
 105     { 0, "foo", "\\\"$var\\\"", 0, 1, { "\"foo\"", }, IFS },
 106     { 0, "foo", "%$var%", 0, 1, { "%foo%", }, IFS },
 107     { 0, "foo", "-$var-", 0, 1, { "-foo-", }, IFS },
 108
 109     /* Simple quote removal */
 110     { 0, NULL, "\"quoted\"", 0, 1, { "quoted", }, IFS },
 111     { 0, "foo", "\"$var\"\"$var\"", 0, 1, { "foofoo", }, IFS },
 112     { 0, NULL, "'singly-quoted'", 0, 1, { "singly-quoted", }, IFS },
 113     { 0, NULL, "contin\\\nuation", 0, 1, { "continuation", }, IFS },
 114     { 0, NULL, "explicit ''", 0, 2, { "explicit", "", }, IFS },
 115     { 0, NULL, "explicit \"\"", 0, 2, { "explicit", "", }, IFS },
 116     { 0, NULL, "explicit ``", 0, 1, { "explicit", }, IFS },
 117
 118     /* Simple command substitution */
 119     { 0, NULL, "$(echo hello)", 0, 1, { "hello", }, IFS },
 120     { 0, NULL, "$( (echo hello) )", 0, 1, { "hello", }, IFS },
 121     { 0, NULL, "$((echo hello);(echo there))", 0, 2, { "hello", "there", }, IFS },
 122     { 0, NULL, "`echo one two`", 0, 2, { "one", "two", }, IFS },
 123     { 0, NULL, "$(echo ')')", 0, 1, { ")" }, IFS },
 124     { 0, NULL, "$(echo hello; echo)", 0, 1, { "hello", }, IFS },
 125     { 0, NULL, "a$(echo b)c", 0, 1, { "abc", }, IFS },
 126
 127     /* Simple arithmetic expansion */
 128     { 0, NULL, "$((1 + 1))", 0, 1, { "2", }, IFS },
 129     { 0, NULL, "$((2-3))", 0, 1, { "-1", }, IFS },
 130     { 0, NULL, "$((-1))", 0, 1, { "-1", }, IFS },
 131     { 0, NULL, "$[50+20]", 0, 1, { "70", }, IFS },
 132     { 0, NULL, "$(((2+3)*(4+5)))", 0, 1, { "45", }, IFS },
 133     { 0, NULL, "$((010))", 0, 1, { "8" }, IFS },
 134     { 0, NULL, "$((0x10))", 0, 1, { "16" }, IFS },
 135     { 0, NULL, "$((010+0x10))", 0, 1, { "24" }, IFS },
 136     { 0, NULL, "$((-010+0x10))", 0, 1, { "8" }, IFS },
 137     { 0, NULL, "$((-0x10+010))", 0, 1, { "-8" }, IFS },
 138
 139     /* Advanced parameter expansion */
 140     { 0, NULL, "${var:-bar}", 0, 1, { "bar", }, IFS },
 141     { 0, NULL, "${var-bar}", 0, 1, { "bar", }, IFS },
 142     { 0, "", "${var:-bar}", 0, 1, { "bar", }, IFS },
 143     { 0, "foo", "${var:-bar}", 0, 1, { "foo", }, IFS },
 144     { 0, "", "${var-bar}", 0, 0, { NULL, }, IFS },
 145     { 0, NULL, "${var:=bar}", 0, 1, { "bar", }, IFS },
 146     { 0, NULL, "${var=bar}", 0, 1, { "bar", }, IFS },
 147     { 0, "", "${var:=bar}", 0, 1, { "bar", }, IFS },
 148     { 0, "foo", "${var:=bar}", 0, 1, { "foo", }, IFS },
 149     { 0, "", "${var=bar}", 0, 0, { NULL, }, IFS },
 150     { 0, "foo", "${var:?bar}", 0, 1, { "foo", }, IFS },
 151     { 0, NULL, "${var:+bar}", 0, 0, { NULL, }, IFS },
 152     { 0, NULL, "${var+bar}", 0, 0, { NULL, }, IFS },
 153     { 0, "", "${var:+bar}", 0, 0, { NULL, }, IFS },
 154     { 0, "foo", "${var:+bar}", 0, 1, { "bar", }, IFS },
 155     { 0, "", "${var+bar}", 0, 1, { "bar", }, IFS },
 156     { 0, "12345", "${#var}", 0, 1, { "5", }, IFS },
 157     { 0, NULL, "${var:-'}'}", 0, 1, { "}", }, IFS },
 158     { 0, NULL, "${var-}", 0, 0, { NULL }, IFS },
 159
 160     { 0, "pizza", "${var#${var}}", 0, 0, { NULL }, IFS },
 161     { 0, "pepperoni", "${var%$(echo oni)}", 0, 1, { "pepper" }, IFS },
 162     { 0, "6pack", "${var#$((6))}", 0, 1, { "pack" }, IFS },
 163     { 0, "b*witched", "${var##b*}", 0, 0, { NULL }, IFS },
 164     { 0, "b*witched", "${var##\"b*\"}", 0, 1, { "witched" }, IFS },
 165     { 0, "banana", "${var%na*}", 0, 1, { "bana", }, IFS },
 166     { 0, "banana", "${var%%na*}", 0, 1, { "ba", }, IFS },
 167     { 0, "borabora-island", "${var#*bora}", 0, 1, { "bora-island", }, IFS },
 168     { 0, "borabora-island", "${var##*bora}", 0, 1, { "-island", }, IFS },
 169     { 0, "coconut", "${var##\\*co}", 0, 1, { "coconut", }, IFS },
 170     { 0, "100%", "${var%0%}", 0, 1, { "10" }, IFS },
 171
 172     /* Pathname expansion */
 173     { 0, NULL, "???", 0, 2, { "one", "two", }, IFS },
 174     { 0, NULL, "[ot]??", 0, 2, { "one", "two", }, IFS },
 175     { 0, NULL, "t*", 0, 2, { "three", "two", }, IFS },
 176     { 0, NULL, "\"t\"*", 0, 2, { "three", "two", }, IFS },
 177
 178     /* Nested constructs */
 179     { 0, "one two", "$var", 0, 2, { "one", "two", }, IFS },
 180     { 0, "one two three", "$var", 0, 3, { "one", "two", "three", }, IFS },
 181     { 0, " \tfoo\t\tbar ", "$var", 0, 2, { "foo", "bar", }, IFS },
 182     { 0, "  red  , white blue", "$var", 0, 3, { "red", "white", "blue", }, ", \n\t" },
 183     { 0, "  red  , white blue", "\"$var\"", 0, 1, { "  red  , white blue", }, ", \n\t" },
 184     { 0, NULL, "\"$(echo hello there)\"", 0, 1, { "hello there", }, IFS },
 185     { 0, NULL, "\"$(echo \"hello there\")\"", 0, 1, { "hello there", }, IFS },
 186     { 0, NULL, "${var=one two} \"$var\"", 0, 3, { "one", "two", "one two", }, IFS },
 187     { 0, "1", "$(( $(echo 3)+$var ))", 0, 1, { "4", }, IFS },
 188     { 0, NULL, "\"$(echo \"*\")\"", 0, 1, { "*", }, IFS },
 189     { 0, NULL, "\"a\n\n$(echo)b\"", 0, 1, { "a\n\nb", }, IFS },
 190     { 0, "foo", "*$var*", 0, 1, { "*foo*", }, IFS },
 191     { 0, "o thr", "*$var*", 0, 2, { "two", "three" }, IFS },
 192
 193     /* Different IFS values */
 194     { 0, "a b\tc\nd  ", "$var", 0, 4, { "a", "b", "c", "d" }, NULL /* unset */ },
 195     { 0, "a b\tc d  ", "$var", 0, 1, { "a b\tc d  " }, "" /* `null' */ },
 196     { 0, "a,b c\n, d", "$var", 0, 3, { "a", "b c", " d" }, "\t\n," },
 197
 198     /* Other things that should succeed */
 199     { 0, NULL, "\\*\"|&;<>\"\\(\\)\\{\\}", 0, 1, { "*|&;<>(){}", }, IFS },
 200     { 0, "???", "$var", 0, 1, { "???", }, IFS },
 201     { 0, NULL, "$var", 0, 0, { NULL, }, IFS },
 202     { 0, NULL, "\"\\n\"", 0, 1, { "\\n", }, IFS },
 203     { 0, NULL, "", 0, 0, { NULL, }, IFS },
 204
 205     /* Flags not already covered (testit() has special handling for these) */
 206     { 0, NULL, "one two", WRDE_DOOFFS, 2, { "one", "two", }, IFS },
 207     { 0, NULL, "appended", WRDE_APPEND, 3, { "pre1", "pre2", "appended", }, IFS },
 208     { 0, NULL, "appended", WRDE_DOOFFS|WRDE_APPEND, 3, { "pre1", "pre2", "appended", }, IFS },
 209
 210     /* Things that should fail */
 211     { WRDE_BADCHAR, NULL, "new\nline", 0, 0, { NULL, }, "" /* \n not IFS */ },
 212     { WRDE_BADCHAR, NULL, "pipe|symbol", 0, 0, { NULL, }, IFS },
 213     { WRDE_BADCHAR, NULL, "&ampersand", 0, 0, { NULL, }, IFS },
 214     { WRDE_BADCHAR, NULL, "semi;colon", 0, 0, { NULL, }, IFS },
 215     { WRDE_BADCHAR, NULL, "<greater", 0, 0, { NULL, }, IFS },
 216     { WRDE_BADCHAR, NULL, "less>", 0, 0, { NULL, }, IFS },
 217     { WRDE_BADCHAR, NULL, "(open-paren", 0, 0, { NULL, }, IFS },
 218     { WRDE_BADCHAR, NULL, "close-paren)", 0, 0, { NULL, }, IFS },
 219     { WRDE_BADCHAR, NULL, "{open-brace", 0, 0, { NULL, }, IFS },
 220     { WRDE_BADCHAR, NULL, "close-brace}", 0, 0, { NULL, }, IFS },
 221     { WRDE_CMDSUB, NULL, "$(ls)", WRDE_NOCMD, 0, { NULL, }, IFS },
 222     { WRDE_BADVAL, NULL, "$var", WRDE_UNDEF, 0, { NULL, }, IFS },
 223     { WRDE_BADVAL, NULL, "$9", WRDE_UNDEF, 0, { NULL, }, IFS },
 224     { WRDE_SYNTAX, NULL, "$[50+20))", 0, 0, { NULL, }, IFS },
 225     { WRDE_SYNTAX, NULL, "${%%noparam}", 0, 0, { NULL, }, IFS },
 226     { WRDE_SYNTAX, NULL, "${missing-brace", 0, 0, { NULL, }, IFS },
 227     { WRDE_SYNTAX, NULL, "$(for i in)", 0, 0, { NULL, }, IFS },
 228     { WRDE_SYNTAX, NULL, "$((2+))", 0, 0, { NULL, }, IFS },
 229     { WRDE_SYNTAX, NULL, "`", 0, 0, { NULL, }, IFS },
 230     { WRDE_SYNTAX, NULL, "$((010+4+))", 0, 0, { NULL }, IFS },
 231     /* Test for CVE-2014-7817. We test 3 combinations of command
 232        substitution inside an arithmetic expression to make sure that
 233        no commands are executed and error is returned.  */
 234     { WRDE_CMDSUB, NULL, "$((`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS },
 235     { WRDE_CMDSUB, NULL, "$((1+`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS },
 236     { WRDE_CMDSUB, NULL, "$((1+$((`echo 1`))))", WRDE_NOCMD, 0, { NULL, }, IFS },
 237
 238     { WRDE_SYNTAX, NULL, "`\\", 0, 0, { NULL, }, IFS },     /* BZ 18042  */
 239     { WRDE_SYNTAX, NULL, "${", 0, 0, { NULL, }, IFS },      /* BZ 18043  */
 240     { WRDE_SYNTAX, NULL, "L${a:", 0, 0, { NULL, }, IFS },   /* BZ 18043#c4  */
 241     { WRDE_SYNTAX, NULL, "$[1/0]", WRDE_NOCMD, 0, {NULL, }, IFS }, /* BZ 18100 */
 242
 243     { -1, NULL, NULL, 0, 0, { NULL, }, IFS },
 244   };
 245
 246 static int testit (struct test_case_struct *tc);
 247 static int tests;
 248
 249 static void
 250 command_line_test (const char *words)
 251 {
 252   wordexp_t we;
 253   int i;
 254   int retval = wordexp (words, &we, 0);
 255   printf ("wordexp returned %d\n", retval);
 256   for (i = 0; i < we.we_wordc; i++)
 257     printf ("we_wordv[%d] = \"%s\"\n", i, we.we_wordv[i]);
 258 }
 259
 260 int
 261 main (int argc, char *argv[])
 262 {
 263   const char *globfile[] = { "one", "two", "three", NULL };
 264   char tmpdir[32];
 265   struct passwd *pw;
 266   const char *cwd;
 267   int test;
 268   int fail = 0;
 269   int i;
 270   struct test_case_struct ts;
 271
 272   if (argc > 1)
 273     {
 274       command_line_test (argv[1]);
 275       return 0;
 276     }
 277
 278   cwd = getcwd (NULL, 0);
 279
 280   /* Set up arena for pathname expansion */
 281   tmpnam (tmpdir);
 282   if (mkdir (tmpdir, S_IRWXU) || chdir (tmpdir))
 283     return -1;
 284   else
 285     {
 286       int fd;
 287
 288       for (i = 0; globfile[i]; ++i)
 289         if ((fd = creat (globfile[i], S_IRUSR | S_IWUSR)) == -1
 290             || close (fd))
 291           return -1;
 292     }
 293
 294   /* If we are not allowed to do command substitution, we install
 295      fork handlers to verify that no forks happened.  No forks should
 296      happen at all if command substitution is disabled.  */
 297   if (__app_register_atfork (register_fork, NULL, NULL) != 0)
 298     {
 299       printf ("Failed to register fork handler.\n");
 300       return -1;
 301     }
 302
 303   for (test = 0; test_case[test].retval != -1; test++)
 304     if (testit (&test_case[test]))
 305       ++fail;
 306
 307   /* Tilde-expansion tests. */
 308   pw = getpwnam ("root");
 309   if (pw != NULL)
 310     {
 311       ts.retval = 0;
 312       ts.env = NULL;
 313       ts.words = "~root ";
 314       ts.flags = 0;
 315       ts.wordc = 1;
 316       ts.wordv[0] = pw->pw_dir;
 317       ts.ifs = IFS;
 318
 319       if (testit (&ts))
 320         ++fail;
 321
 322       ts.retval = 0;
 323       ts.env = pw->pw_dir;
 324       ts.words = "${var#~root}x";
 325       ts.flags = 0;
 326       ts.wordc = 1;
 327       ts.wordv[0] = "x";
 328       ts.ifs = IFS;
 329
 330       if (testit (&ts))
 331         ++fail;
 332     }
 333
 334   /* "~" expands to value of $HOME when HOME is set */
 335
 336   setenv ("HOME", "/dummy/home", 1);
 337   ts.retval = 0;
 338   ts.env = NULL;
 339   ts.words = "~ ~/foo";
 340   ts.flags = 0;
 341   ts.wordc = 2;
 342   ts.wordv[0] = "/dummy/home";
 343   ts.wordv[1] = "/dummy/home/foo";
 344   ts.ifs = IFS;
 345
 346   if (testit (&ts))
 347     ++fail;
 348
 349   /* "~" expands to home dir from passwd file if HOME is not set */
 350
 351   pw = getpwuid (getuid ());
 352   if (pw != NULL)
 353     {
 354       unsetenv ("HOME");
 355       ts.retval = 0;
 356       ts.env = NULL;
 357       ts.words = "~";
 358       ts.flags = 0;
 359       ts.wordc = 1;
 360       ts.wordv[0] = pw->pw_dir;
 361       ts.ifs = IFS;
 362
 363       if (testit (&ts))
 364         ++fail;
 365     }
 366
 367   /* Integer overflow in division.  */
 368   {
 369     static const char *const numbers[] = {
 370       "0",
 371       "1",
 372       "65536",
 373       "2147483648",
 374       "4294967296"
 375       "9223372036854775808",
 376       "18446744073709551616",
 377       "170141183460469231731687303715884105728",
 378       "340282366920938463463374607431768211456",
 379       NULL
 380     };
 381
 382     for (const char *const *num = numbers; *num; ++num)
 383       {
 384         wordexp_t p;
 385         char pattern[256];
 386         snprintf (pattern, sizeof (pattern), "$[(-%s)/(-1)]", *num);
 387         int ret = wordexp (pattern, &p, WRDE_NOCMD);
 388         if (ret == 0)
 389           {
 390             if (p.we_wordc != 1 || strcmp (p.we_wordv[0], *num) != 0)
 391               {
 392                 printf ("Integer overflow for \"%s\" failed", pattern);
 393                 ++fail;
 394               }
 395             wordfree (&p);
 396           }
 397         else if (ret != WRDE_SYNTAX)
 398           {
 399             printf ("Integer overflow for \"%s\" failed with %d",
 400                     pattern, ret);
 401             ++fail;
 402           }
 403       }
 404   }
 405
 406   puts ("tests completed, now cleaning up");
 407
 408   /* Clean up */
 409   for (i = 0; globfile[i]; ++i)
 410     remove (globfile[i]);
 411
 412   if (cwd == NULL)
 413     cwd = "..";
 414
 415   chdir (cwd);
 416   rmdir (tmpdir);
 417
 418   printf ("tests failed: %d\n", fail);
 419
 420   return fail != 0;
 421 }
 422
 423 static const char *
 424 at_page_end (const char *words)
 425 {
 426   const int pagesize = getpagesize ();
 427   char *start = mmap (0, 2 * pagesize, PROT_READ|PROT_WRITE,
 428                       MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
 429
 430   if (start == MAP_FAILED)
 431     return start;
 432
 433   if (mprotect (start + pagesize, pagesize, PROT_NONE))
 434     {
 435       munmap (start, 2 * pagesize);
 436       return MAP_FAILED;
 437     }
 438
 439   /* Includes terminating NUL.  */
 440   const size_t words_size = strlen (words) + 1;
 441   char *words_start = start + pagesize - words_size;
 442   memcpy (words_start, words, words_size);
 443
 444   return words_start;
 445 }
 446
 447 static int
 448 testit (struct test_case_struct *tc)
 449 {
 450   int retval;
 451   wordexp_t we, sav_we;
 452   char *dummy;
 453   int bzzzt = 0;
 454   int start_offs = 0;
 455   int i;
 456
 457   if (tc->env)
 458     setenv ("var", tc->env, 1);
 459   else
 460     unsetenv ("var");
 461
 462   if (tc->ifs)
 463     setenv ("IFS", tc->ifs, 1);
 464   else
 465     unsetenv ("IFS");
 466
 467   sav_we.we_wordc = 99;
 468   sav_we.we_wordv = &dummy;
 469   sav_we.we_offs = 3;
 470   we = sav_we;
 471
 472   printf ("Test %d (%s): ", ++tests, tc->words);
 473   fflush (NULL);
 474   const char *words = at_page_end (tc->words);
 475
 476   if (tc->flags & WRDE_NOCMD)
 477     registered_forks = 0;
 478
 479   if (tc->flags & WRDE_APPEND)
 480     {
 481       /* initial wordexp() call, to be appended to */
 482       if (wordexp ("pre1 pre2", &we, tc->flags & ~WRDE_APPEND) != 0)
 483         {
 484           printf ("FAILED setup\n");
 485           return 1;
 486         }
 487     }
 488   retval = wordexp (words, &we, tc->flags);
 489
 490   if ((tc->flags & WRDE_NOCMD)
 491       && (registered_forks > 0))
 492     {
 493           printf ("FAILED fork called for WRDE_NOCMD\n");
 494           return 1;
 495     }
 496
 497   if (tc->flags & WRDE_DOOFFS)
 498       start_offs = sav_we.we_offs;
 499
 500   if (retval != tc->retval || (retval == 0 && we.we_wordc != tc->wordc))
 501     bzzzt = 1;
 502   else if (retval == 0)
 503     {
 504       for (i = 0; i < start_offs; ++i)
 505         if (we.we_wordv[i] != NULL)
 506           {
 507             bzzzt = 1;
 508             break;
 509           }
 510
 511       for (i = 0; i < we.we_wordc; ++i)
 512         if (we.we_wordv[i+start_offs] == NULL ||
 513             strcmp (tc->wordv[i], we.we_wordv[i+start_offs]) != 0)
 514           {
 515             bzzzt = 1;
 516             break;
 517           }
 518     }
 519
 520   if (bzzzt)
 521     {
 522       printf ("FAILED\n");
 523       printf ("Test words: <%s>, need retval %d, wordc %Zd\n",
 524               tc->words, tc->retval, tc->wordc);
 525       if (start_offs != 0)
 526         printf ("(preceded by %d NULLs)\n", start_offs);
 527       printf ("Got retval %d, wordc %Zd: ", retval, we.we_wordc);
 528       if (retval == 0 || retval == WRDE_NOSPACE)
 529         {
 530           for (i = 0; i < we.we_wordc + start_offs; ++i)
 531             if (we.we_wordv[i] == NULL)
 532               printf ("NULL ");
 533             else
 534               printf ("<%s> ", we.we_wordv[i]);
 535         }
 536       printf ("\n");
 537     }
 538   else if (retval != 0 && retval != WRDE_NOSPACE &&
 539            (we.we_wordc != sav_we.we_wordc ||
 540             we.we_wordv != sav_we.we_wordv ||
 541             we.we_offs != sav_we.we_offs))
 542     {
 543       bzzzt = 1;
 544       printf ("FAILED to restore wordexp_t members\n");
 545     }
 546   else
 547     printf ("OK\n");
 548
 549   if (retval == 0 || retval == WRDE_NOSPACE)
 550     wordfree (&we);
 551
 552   const int page_size = getpagesize ();
 553   char *start = (char *) PTR_ALIGN_DOWN (words, page_size);
 554
 555   if (munmap (start, 2 * page_size) != 0)
 556     return 1;
 557
 558   fflush (NULL);
 559   return bzzzt;
 560 }