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+/*
+ * Copyright (c) 2005 Stefan Walter
+ * Copyright (c) 2011 Collabora Ltd.
+ * Copyright (c) 2013 Red Hat Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the
+ * following disclaimer.
+ * * Redistributions in binary form must reproduce the
+ * above copyright notice, this list of conditions and
+ * the following disclaimer in the documentation and/or
+ * other materials provided with the distribution.
+ * * The names of contributors to this software may not be
+ * used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ *
+ * CONTRIBUTORS
+ * Stef Walter <stefw@redhat.com>
+ */
+
+#include "config.h"
+
+#include "debug.h"
+#include "message.h"
+#include "path.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef OS_UNIX
+#include <paths.h>
+#include <pwd.h>
+#include <unistd.h>
+#endif
+
+#ifdef OS_WIN32
+#include <shlobj.h>
+#endif
+
+
+char *
+p11_path_base (const char *path)
+{
+#ifdef OS_WIN32
+ static const char *delims = "/\\";
+#else
+ static const char *delims = "/";
+#endif
+
+ const char *end;
+ const char *beg;
+
+ return_val_if_fail (path != NULL, NULL);
+
+ /* Any trailing slashes */
+ end = path + strlen (path);
+ while (end != path) {
+ if (!strchr (delims, *(end - 1)))
+ break;
+ end--;
+ }
+
+ /* Find the last slash after those */
+ beg = end;
+ while (beg != path) {
+ if (strchr (delims, *(beg - 1)))
+ break;
+ beg--;
+ }
+
+ return strndup (beg, end - beg);
+}
+
+static char *
+expand_homedir (const char *remainder)
+{
+ const char *env;
+
+ env = getenv ("HOME");
+ if (env && env[0]) {
+ return p11_path_build (env, remainder, NULL);
+
+ } else {
+#ifdef OS_UNIX
+ struct passwd *pwd;
+ int error = 0;
+
+ pwd = getpwuid (getuid ());
+ if (!pwd) {
+ error = errno;
+ p11_message ("couldn't lookup home directory for user %d: %s",
+ getuid (), strerror (errno));
+ errno = error;
+ return NULL;
+ }
+
+ return p11_path_build (pwd->pw_dir, remainder, NULL);
+
+#else /* OS_WIN32 */
+ char directory[MAX_PATH + 1];
+
+ if (!SHGetSpecialFolderPathA (NULL, directory, CSIDL_PROFILE, TRUE)) {
+ p11_message ("couldn't lookup home directory for user");
+ errno = ENOTDIR;
+ return NULL;
+ }
+
+ return p11_path_build (directory, remainder, NULL);
+
+#endif /* OS_WIN32 */
+ }
+}
+
+static char *
+expand_tempdir (const char *remainder)
+{
+ const char *env;
+
+ env = getenv ("TEMP");
+ if (env && env[0]) {
+ return p11_path_build (env, remainder, NULL);
+
+ } else {
+#ifdef OS_UNIX
+#ifdef _PATH_TMP
+ return p11_path_build (_PATH_TMP, remainder, NULL);
+#else
+ return p11_path_build ("/tmp", remainder, NULL);
+#endif
+
+#else /* OS_WIN32 */
+ char directory[MAX_PATH + 1];
+
+ if (!GetTempPathA (MAX_PATH + 1, directory)) {
+ p11_message ("couldn't lookup temp directory");
+ errno = ENOTDIR;
+ return NULL;
+ }
+
+ return p11_path_build (directory, remainder, NULL);
+
+#endif /* OS_WIN32 */
+ }
+}
+
+static bool
+is_path_component_or_null (char ch)
+{
+ return (ch == '0' || ch == '/'
+#ifdef OS_WIN32
+ || ch == '\\'
+#endif
+ );
+}
+
+char *
+p11_path_expand (const char *path)
+{
+ return_val_if_fail (path != NULL, NULL);
+
+ if (strncmp (path, "~", 1) == 0 &&
+ is_path_component_or_null (path[1])) {
+ return expand_homedir (path + 2);
+
+ } else if (strncmp (path, "$HOME", 5) == 0 &&
+ is_path_component_or_null (path[5])) {
+ return expand_homedir (path + 6);
+
+ } else if (strncmp (path, "$TEMP", 5) == 0 &&
+ is_path_component_or_null (path[5])) {
+ return expand_tempdir (path + 6);
+
+ } else {
+ return strdup (path);
+ }
+}
+
+bool
+p11_path_absolute (const char *path)
+{
+ return_val_if_fail (path != NULL, false);
+
+#ifdef OS_UNIX
+ return (path[0] == '/');
+#else
+ return (path[0] != '\0' && path[1] == ':' && path[2] == '\\');
+#endif
+}
+
+char *
+p11_path_build (const char *path,
+ ...)
+{
+#ifdef OS_WIN32
+ static const char delim = '\\';
+#else
+ static const char delim = '/';
+#endif
+ const char *first = path;
+ char *built;
+ size_t len;
+ size_t at;
+ size_t num;
+ va_list va;
+
+ return_val_if_fail (path != NULL, NULL);
+
+ len = 1;
+ va_start (va, path);
+ while (path != NULL) {
+ len += strlen (path) + 1;
+ path = va_arg (va, const char *);
+ }
+ va_end (va);
+
+ built = malloc (len + 1);
+ return_val_if_fail (built != NULL, NULL);
+
+ at = 0;
+ path = first;
+ va_start (va, path);
+ while (path != NULL) {
+ if (at != 0 && built[at - 1] != delim && path[0] != delim)
+ built[at++] = delim;
+ num = strlen (path);
+ assert (at + num < len);
+ memcpy (built + at, path, num);
+
+ at += num;
+ path = va_arg (va, const char *);
+ }
+ va_end (va);
+
+ assert (at < len);
+ built[at] = '\0';
+ return built;
+}