Mon 14 Oct 23:14:00 CEST 2024

library/stdio.c

@@ -0,0 +1,48 @@
+/*
+Copyright (C) 2016-2019 The University of Notre Dame
+This software is distributed under the GNU General Public License.
+See the file LICENSE for details.
+*/
+
+#include "kernel/types.h"
+#include "library/stdio.h"
+#include "library/syscalls.h"
+#include "library/string.h"
+#include "stdarg.h"
+
+static char stdio_buffer[PAGE_SIZE] = { 0 };
+
+static uint32_t stdio_buffer_index = 0;
+
+void flush()
+{
+	syscall_object_write(KNO_STDOUT, stdio_buffer, stdio_buffer_index, 0);
+	stdio_buffer_index = 0;
+	stdio_buffer[0] = 0;
+}
+
+static void printf_buffer(char *s, unsigned len)
+{
+	while(len) {
+		unsigned l = len % (PAGE_SIZE - 1);
+		if(l > PAGE_SIZE - stdio_buffer_index - 1) {
+			flush();
+		}
+		memcpy(stdio_buffer + stdio_buffer_index, s, l);
+		stdio_buffer_index += l;
+		len -= l;
+	}
+	stdio_buffer[stdio_buffer_index] = 0;
+}
+
+void printf_putchar(char c)
+{
+	printf_buffer(&c, 1);
+	if(c == '\n')
+		flush();
+}
+
+void printf_putstring(char *s)
+{
+	printf_buffer(s, strlen(s));
+}