Userspace: Add loadkeys program to change keymap

userspace/CMakeLists.txt

@@ -12,6 +12,7 @@ set(USERSPACE_PROJECTS
 	id
 	init
 	image
+	loadkeys
 	ls
 	meminfo
 	mkdir

userspace/loadkeys/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(loadkeys CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable(loadkeys ${SOURCES})
+target_compile_options(loadkeys PUBLIC -O2 -g)
+target_link_libraries(loadkeys PUBLIC libc)
+
+add_custom_target(loadkeys-install
+	COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/loadkeys ${BANAN_BIN}/
+	DEPENDS loadkeys
+)

userspace/loadkeys/main.cpp

@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/banan-os.h>
+#include <sys/stat.h>
+
+int try_load_keymap(const char* path)
+{
+	if (load_keymap(path) == -1)
+	{
+		perror("load_keymap");
+		return 1;
+	}
+	return 0;
+}
+
+int main(int argc, char** argv)
+{
+	if (argc != 2)
+	{
+		fprintf(stderr, "usage: %s KEYMAP\n", argv[0]);
+		return 1;
+	}
+
+	struct stat st;
+	if (stat(argv[1], &st) == 0)
+		return try_load_keymap(argv[1]);
+	
+	char buffer[128];
+	strcpy(buffer, "/usr/share/keymaps/");
+	strcat(buffer, argv[1]);
+
+	if (stat(buffer, &st) == 0)
+		return try_load_keymap(buffer);
+
+	strcat(buffer, ".keymap");
+
+	if (stat(buffer, &st) == 0)
+		return try_load_keymap(buffer);
+
+	fprintf(stderr, "Keymap '%s' not found\n", argv[1]);
+	return 1;
+}