More compatible path munging and handling code

Centralize the path handling code, so we can remove unixy assumptions
and have a chance of running on Windows. The current goal is to run
all the tests on Windows.

Includes some code from LRN <lrn1986@gmail.com>

https://bugs.freedesktop.org/show_bug.cgi?id=63062

1 files changed, 258 insertions, 0 deletions

diff --git a/common/path.c b/common/path.c
new file mode 100644
index 0000000..bba2c23
--- /dev/null
+++ b/common/path.c
@@ -0,0 +1,258 @@
+/*
+ * 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;
+}