1 files changed, 97 insertions, 0 deletions
diff --git a/410user/libstdio/printf.c b/410user/libstdio/printf.c
new file mode 100644
index 0000000..0a4a4db
--- /dev/null
+++ b/410user/libstdio/printf.c
@@ -0,0 +1,97 @@
+/*
+ * Mach Operating System
+ * Copyright (c) 1993-1989 Carnegie Mellon University.
+ * Copyright (c) 1994 The University of Utah and
+ * the Computer Systems Laboratory (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
+ * THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM ANY LIABILITY
+ * OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF
+ * THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <syscall.h>
+#include "doprnt.h"
+
+/* This version of printf is implemented in terms of putchar and puts.  */
+
+#define	PRINTF_BUFMAX	128
+
+struct printf_state {
+	char buf[PRINTF_BUFMAX];
+	unsigned int index;
+};
+
+static void
+flush(struct printf_state *state)
+{
+	print(state->index, state->buf);
+	state->index = 0;
+}
+
+static void
+printf_char(char *arg, int c)
+{
+	struct printf_state *state = (struct printf_state *) arg;
+
+	if (state->index >= PRINTF_BUFMAX) {
+		flush(state);
+	}
+
+	state->buf[state->index] = c;
+	state->index++;
+	if (c == '\n') {
+		flush(state);
+	}
+}
+
+/*
+ * Printing (to console)
+ */
+int vprintf(const char *fmt, va_list args)
+{
+	struct printf_state state;
+
+	state.index = 0;
+	_doprnt(fmt, args, 0, (void (*)())printf_char, (char *) &state);
+
+	if (state.index != 0)
+	    flush(&state);
+
+	/* _doprnt currently doesn't pass back error codes,
+	   so just assume nothing bad happened.  */
+	return 0;
+}
+
+int
+printf(const char *fmt, ...)
+{
+	va_list	args;
+	int err;
+
+	va_start(args, fmt);
+	err = vprintf(fmt, args);
+	va_end(args);
+
+	return err;
+}
+