Paths related utility functions.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11580 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/add-ons/kernel/file_systems/fs_shell/path_util.cpp

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+/*
+ * Copyright 2005, Ingo Weinhold, bonefish@users.sf.net.
+ * Distributed under the terms of the MIT License.
+ */
+
+#include "compat.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "path_util.h"
+
+status_t
+get_last_path_component(const char *path, char *buffer, int bufferLen)
+{
+	int len = strlen(path);
+	if (len == 0)
+		return FS_EINVAL;
+
+	// eat trailing '/'
+	while (len > 0 && path[len - 1] == '/')
+		len--;
+
+	if (len == 0) {
+		// path is `/'
+		len = 1;
+	} else {
+		// find previous '/'
+		int pos = len - 1;
+		while (pos > 0 && path[pos] != '/')
+			pos--;
+		if (path[pos] == '/')
+			pos++;
+
+		path += pos;
+		len -= pos;
+	}
+
+	if (len >= bufferLen)
+		return FS_NAME_TOO_LONG;
+
+	memcpy(buffer, path, len);
+	buffer[len] = '\0';
+	return FS_OK;
+}
+
+char *
+make_path(const char *dir, const char *entry)
+{
+	// get the len
+	int dirLen = strlen(dir);
+	int entryLen = strlen(entry);
+	bool insertSeparator = (dir[dirLen - 1] != '/');
+	int pathLen = dirLen + entryLen + (insertSeparator ? 1 : 0) + 1;
+
+	// allocate the path
+	char *path = (char*)malloc(pathLen);
+	if (!path)
+		return NULL;
+
+	// compose the path
+	strcpy(path, dir);
+	if (insertSeparator)
+		strcat(path + dirLen, "/");
+	strcat(path + dirLen, entry);
+
+	return path;
+}
+
+

src/tests/add-ons/kernel/file_systems/fs_shell/path_util.h

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+/*
+ * Copyright 2005, Ingo Weinhold, bonefish@users.sf.net.
+ * Distributed under the terms of the MIT License.
+ */
+
+#ifndef FS_SHELL_PATH_UTIL_H
+#define FS_SHELL_PATH_UTIL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+status_t get_last_path_component(const char *path, char *buffer, int bufferLen);
+char *make_path(const char *dir, const char *entry);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	// FS_SHELL_PATH_UTIL_H