import a slightly modified realpath() test case from glibc

test/stdlib/test-canon.c

@@ -0,0 +1,254 @@
+/* Test program for returning the canonical absolute name of a given file.
+   Copyright (C) 1996,1997,2000,2002,2004,2005,2006
+   Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David Mosberger <davidm@azstarnet.com>.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* This file must be run from within a directory called "stdlib".  */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/param.h>
+
+/* Prototype for our test function.  */
+extern int do_test (int argc, char *argv[]);
+#include <test-skeleton.c>
+
+#ifndef PATH_MAX
+# define PATH_MAX 4096
+#endif
+static char	cwd[PATH_MAX];
+static size_t	cwd_len;
+
+struct {
+  const char *	name;
+  const char *	value;
+} symlinks[] = {
+  {"SYMLINK_LOOP",	"SYMLINK_LOOP"},
+  {"SYMLINK_1",		"."},
+  {"SYMLINK_2",		"//////./../../etc"},
+  {"SYMLINK_3",		"SYMLINK_1"},
+  {"SYMLINK_4",		"SYMLINK_2"},
+  {"SYMLINK_5",		"doesNotExist"},
+};
+
+struct {
+  const char * in, * out, * resolved;
+  int error;
+} tests[] = {
+  /*  0 */
+  {"/",					"/"},
+  {"/////////////////////////////////",	"/"},
+  {"/.././.././.././..///",		"/"},
+  {"/etc",				"/etc"},
+  {"/etc/../etc",			"/etc"},
+  /*  5 */
+  {"/doesNotExist/../etc",		0, "/doesNotExist", ENOENT},
+  {"./././././././././.",		"."},
+  {"/etc/.//doesNotExist",		0, "/etc/doesNotExist", ENOENT},
+  {"./doesExist",			"./doesExist"},
+  {"./doesExist/",			"./doesExist"},
+  /* 10 */
+  {"./doesExist/../doesExist",		"./doesExist"},
+  {"foobar",				0, "./foobar", ENOENT},
+  {".",					"."},
+  {"./foobar",				0, "./foobar", ENOENT},
+#ifdef __UCLIBC__
+  /* we differ from glibc here, but POSIX allows it as it says that if we did
+   * not successfuly complete, the value of resolved_path is undefined */
+  {"SYMLINK_LOOP",			0, "", ELOOP},
+  /* 15 */
+  {"./SYMLINK_LOOP",			0, "", ELOOP},
+#else
+  {"SYMLINK_LOOP",			0, "./SYMLINK_LOOP", ELOOP},
+  /* 15 */
+  {"./SYMLINK_LOOP",			0, "./SYMLINK_LOOP", ELOOP},
+#endif
+  {"SYMLINK_1",				"."},
+  {"SYMLINK_1/foobar",			0, "./foobar", ENOENT},
+  {"SYMLINK_2",				"/etc"},
+  {"SYMLINK_3",				"."},
+  /* 20 */
+  {"SYMLINK_4",				"/etc"},
+  {"../stdlib/SYMLINK_1",		"."},
+  {"../stdlib/SYMLINK_2",		"/etc"},
+  {"../stdlib/SYMLINK_3",		"."},
+  {"../stdlib/SYMLINK_4",		"/etc"},
+  /* 25 */
+  {"./SYMLINK_5",			0, "./doesNotExist", ENOENT},
+  {"SYMLINK_5",				0, "./doesNotExist", ENOENT},
+  {"SYMLINK_5/foobar",			0, "./doesNotExist", ENOENT},
+  {"doesExist/../../stdlib/doesExist",	"./doesExist"},
+  {"doesExist/.././../stdlib/.",	"."},
+#ifndef __UCLIBC__
+  /* we dont check for ENOTDIR in readlink() which causes failures to
+   * propogate up to realpath() ... so disable for now ... */
+  /* 30 */
+  {"./doesExist/someFile/",		0, "./doesExist/someFile", ENOTDIR},
+  {"./doesExist/someFile/..",		0, "./doesExist/someFile", ENOTDIR},
+#endif
+};
+
+
+static int
+check_path (const char * result, const char * expected)
+{
+  int good;
+
+  if (!result)
+    return (expected == NULL);
+
+  if (!expected)
+    return 0;
+
+  if (expected[0] == '.' && (expected[1] == '/' || expected[1] == '\0'))
+    good = (strncmp (result, cwd, cwd_len) == 0
+	    && strcmp (result + cwd_len, expected + 1) == 0);
+  else
+    good = (strcmp (expected, result) == 0);
+
+  return good;
+}
+
+
+int
+do_test (int argc, char ** argv)
+{
+  char * result;
+  int i, errors = 0;
+  char buf[PATH_MAX];
+
+  getcwd (cwd, sizeof(buf));
+  cwd_len = strlen (cwd);
+
+#ifndef __UCLIBC__
+  /* we choose to crash in uClibc when given a NULL */
+  errno = 0;
+  if (realpath (NULL, buf) != NULL || errno != EINVAL)
+    {
+      printf ("%s: expected return value NULL and errno set to EINVAL"
+	      " for realpath(NULL,...)\n", argv[0]);
+      ++errors;
+    }
+#endif
+
+#if 0
+  /* This is now allowed.  The test is invalid.  */
+  errno = 0;
+  if (realpath ("/", NULL) != NULL || errno != EINVAL)
+    {
+      printf ("%s: expected return value NULL and errno set to EINVAL"
+	      " for realpath(...,NULL)\n", argv[0]);
+      ++errors;
+    }
+#endif
+
+  errno = 0;
+  if (realpath ("", buf) != NULL || errno != ENOENT)
+    {
+      printf ("%s: expected return value NULL and set errno to ENOENT"
+	      " for realpath(\"\",...)\n", argv[0]);
+      ++errors;
+    }
+
+  for (i = 0; i < (int) (sizeof (symlinks) / sizeof (symlinks[0])); ++i)
+    symlink (symlinks[i].value, symlinks[i].name);
+
+  int has_dir = mkdir ("doesExist", 0777) == 0;
+
+  int fd = has_dir ? creat ("doesExist/someFile", 0777) : -1;
+
+  for (i = 0; i < (int) (sizeof (tests) / sizeof (tests[0])); ++i)
+    {
+      buf[0] = '\0';
+      result = realpath (tests[i].in, buf);
+
+      if (!check_path (result, tests[i].out))
+	{
+	  printf ("%s: flunked test %d (expected `%s', got `%s')\n",
+		  argv[0], i, tests[i].out ? tests[i].out : "NULL",
+		  result ? result : "NULL");
+	  ++errors;
+	  continue;
+	}
+
+      if (!check_path (buf, tests[i].out ? tests[i].out : tests[i].resolved))
+	{
+	  printf ("%s: flunked test %d (expected resolved `%s', got `%s')\n",
+		  argv[0], i, tests[i].out ? tests[i].out : tests[i].resolved,
+		  buf);
+	  ++errors;
+	  continue;
+	}
+
+      if (!tests[i].out && errno != tests[i].error)
+	{
+	  printf ("%s: flunked test %d (expected errno %d, got %d)\n",
+		  argv[0], i, tests[i].error, errno);
+	  ++errors;
+	  continue;
+	}
+
+#ifndef __UCLIBC__
+      /* we choose to crash in uClibc when given a NULL */
+      char *result2 = realpath (tests[i].in, NULL);
+      if ((result2 == NULL && result != NULL)
+	  || (result2 != NULL && strcmp (result, result2) != 0))
+	{
+	  printf ("\
+%s: realpath(..., NULL) produced different result than realpath(..., buf): '%s' vs '%s'\n",
+		  argv[0], result2, result);
+	  ++errors;
+	}
+      free (result2);
+#endif
+    }
+
+  getcwd (buf, sizeof(buf));
+  if (strcmp (buf, cwd))
+    {
+      printf ("%s: current working directory changed from %s to %s\n",
+	      argv[0], cwd, buf);
+      ++errors;
+    }
+
+  if (fd >= 0)
+    {
+      close (fd);
+      unlink ("doesExist/someFile");
+    }
+
+  if (has_dir)
+    rmdir ("doesExist");
+
+  for (i = 0; i < (int) (sizeof (symlinks) / sizeof (symlinks[0])); ++i)
+    unlink (symlinks[i].name);
+
+  if (errors != 0)
+    {
+      printf ("%d errors.\n", errors);
+      return EXIT_FAILURE;
+    }
+
+  puts ("No errors.");
+  return EXIT_SUCCESS;
+}