user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/sysdeps/lemon/generic/pty.cpp

@@ -0,0 +1,63 @@
+#include <asm/ioctls.h>
+#include <sys/ioctl.h>
+
+#include <errno.h>
+
+#include <bits/ensure.h>
+#include <mlibc/all-sysdeps.hpp>
+#include <mlibc/debug.hpp>
+
+#include <stdio.h>
+
+namespace mlibc {
+
+int sys_isatty(int fd) {
+	struct winsize ws;
+	long ret = sys_ioctl(fd, TIOCGWINSZ, &ws, 0);
+
+	if(!ret) return 0;
+
+	return ENOTTY;
+}
+
+int sys_tcgetattr(int fd, struct termios *attr) {
+	if(int e = sys_isatty(fd))
+		return e;
+
+	int ret;
+	sys_ioctl(fd, TCGETS, attr, &ret);
+
+	if(ret)
+		return -ret;
+
+	return 0;
+}
+
+int sys_tcsetattr(int fd, int optional_action, const struct termios *attr) {
+	if(int e = sys_isatty(fd))
+		return e;
+
+	if(optional_action){
+		mlibc::infoLogger() << "mlibc warning: sys_tcsetattr ignores optional_action" << frg::endlog;
+	}
+
+	int ret;
+	sys_ioctl(fd, TCSETS, const_cast<struct termios*>(attr), &ret);
+
+	if(ret)
+		return -ret;
+
+	return 0;
+}
+
+int sys_ptsname(int fd, char *buffer, size_t length) {
+	int index;
+	if(int e = sys_ioctl(fd, TIOCGPTN, &index, NULL); e)
+		return e;
+	if((size_t)snprintf(buffer, length, "/dev/pts/%d", index) >= length) {
+		return ERANGE;
+	}
+	return 0;
+}
+
+}