Kernel/userspace: Implement KD_LOADFONT and loadfont program

userspace/CMakeLists.txt

@@ -11,6 +11,7 @@ set(USERSPACE_PROJECTS
 	id
 	image
 	init
+	loadfont
 	loadkeys
 	ls
 	meminfo

userspace/libraries/LibC/include/stropts.h

@@ -101,6 +101,8 @@ struct str_list
 #define I_SWROPT	28
 #define I_UNLINK	29
 
+#define KD_LOADFONT	30
+
 #define FLUSHR	1
 #define FLUSHRW	2
 #define FLUSHW	3

userspace/loadfont/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(SOURCES
+	main.cpp
+)
+
+add_executable(loadfont ${SOURCES})
+banan_link_library(loadfont ban)
+banan_link_library(loadfont libc)
+
+install(TARGETS loadfont)

userspace/loadfont/main.cpp

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stropts.h>
+#include <unistd.h>
+
+int usage(int ret, const char* argv0)
+{
+	FILE* fout = ret ? stderr : stdout;
+	fprintf(fout, "usage: %s FILE\n", argv0);
+	return ret;
+}
+
+int main(int argc, char** argv)
+{
+	if (argc != 2)
+		return usage(1, argv[0]);
+
+	if (!isatty(STDOUT_FILENO))
+	{
+		fprintf(stderr, "stdout is not tty\n");
+		return 1;
+	}
+
+	if (ioctl(STDOUT_FILENO, KD_LOADFONT, argv[1]) == -1)
+	{
+		perror("ioctl");
+		return 1;
+	}
+
+	return 0;
+}