LibC: Implement basename and dirname

userspace/libraries/LibC/CMakeLists.txt

@@ -10,6 +10,7 @@ set(LIBC_SOURCES
 	ftw.cpp
 	grp.cpp
 	inttypes.cpp
+	libgen.cpp
 	locale.cpp
 	malloc.cpp
 	math.cpp

userspace/libraries/LibC/libgen.cpp

@@ -0,0 +1,69 @@
+#include <libgen.h>
+#include <limits.h>
+#include <string.h>
+
+char* basename(char* path)
+{
+	static char buffer[PATH_MAX];
+
+	constexpr auto prep_string =
+		[](const char* str) -> char*
+		{
+			strcpy(buffer, str);
+			return buffer;
+		};
+
+	if (path == nullptr || path[0] == '\0')
+		return prep_string(".");
+
+	char* endp = path + strlen(path);
+
+	while (endp > path && endp[-1] == '/')
+		endp--;
+	if (endp == path)
+		return prep_string("/");
+
+	char* startp = endp;
+	while (startp > path && startp[-1] != '/')
+		startp--;
+
+	memcpy(buffer, startp, endp - startp);
+	buffer[endp - startp] = '\0';
+	return buffer;
+}
+
+char* dirname(char* path)
+{
+	static char buffer[PATH_MAX];
+
+	constexpr auto prep_string =
+		[](const char* str) -> char*
+		{
+			strcpy(buffer, str);
+			return buffer;
+		};
+
+	if (path == nullptr || path[0] == '\0')
+		return prep_string(".");
+
+	char* endp = path + strlen(path);
+
+	while (endp > path && endp[-1] == '/')
+		endp--;
+	if (endp == path)
+		return prep_string("/");
+
+	while (endp > path && endp[-1] != '/')
+		endp--;
+	if (endp == path)
+		return prep_string(".");
+
+	while (endp > path && endp[-1] == '/')
+		endp--;
+	if (endp == path)
+		return prep_string("/");
+
+	memcpy(buffer, path, endp - path);
+	buffer[endp - path] = '\0';
+	return buffer;
+}