From: Ken Thompson <ken@research.uucp>
Date: Mon, 14 May 1979 03:23:29 +0000 (-0500)
Subject: Research V7 development
X-Git-Tag: Research-V7~34
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/9a2a2041cf03e9cae91519b56516c45db0ff643b

Research V7 development
Work on file usr/sys/sys/prf.c

Synthesized-from: v7
---

diff --git a/usr/sys/sys/prf.c b/usr/sys/sys/prf.c
new file mode 100644
index 0000000000..4ba9863e9a
--- /dev/null
+++ b/usr/sys/sys/prf.c
@@ -0,0 +1,116 @@
+#include "../h/param.h"
+#include "../h/systm.h"
+#include "../h/seg.h"
+#include "../h/buf.h"
+#include "../h/conf.h"
+
+/*
+ * In case console is off,
+ * panicstr contains argument to last
+ * call to panic.
+ */
+
+char	*panicstr;
+
+/*
+ * Scaled down version of C Library printf.
+ * Only %s %u %d (==%u) %o %x %D are recognized.
+ * Used to print diagnostic information
+ * directly on console tty.
+ * Since it is not interrupt driven,
+ * all system activities are pretty much
+ * suspended.
+ * Printf should not be used for chit-chat.
+ */
+/* VARARGS 1 */
+printf(fmt, x1)
+register char *fmt;
+unsigned x1;
+{
+	register c;
+	register unsigned int *adx;
+	char *s;
+
+	adx = &x1;
+loop:
+	while((c = *fmt++) != '%') {
+		if(c == '\0')
+			return;
+		putchar(c);
+	}
+	c = *fmt++;
+	if(c == 'd' || c == 'u' || c == 'o' || c == 'x')
+		printn((long)*adx, c=='o'? 8: (c=='x'? 16:10));
+	else if(c == 's') {
+		s = (char *)*adx;
+		while(c = *s++)
+			putchar(c);
+	} else if (c == 'D') {
+		printn(*(long *)adx, 10);
+		adx += (sizeof(long) / sizeof(int)) - 1;
+	}
+	adx++;
+	goto loop;
+}
+
+/*
+ * Print an unsigned integer in base b.
+ */
+printn(n, b)
+long n;
+{
+	register long a;
+
+	if (n<0) {	/* shouldn't happen */
+		putchar('-');
+		n = -n;
+	}
+	if(a = n/b)
+		printn(a, b);
+	putchar("0123456789ABCDEF"[(int)(n%b)]);
+}
+
+/*
+ * Panic is called on unresolvable
+ * fatal errors.
+ * It syncs, prints "panic: mesg" and
+ * then loops.
+ */
+panic(s)
+char *s;
+{
+	panicstr = s;
+	update();
+	printf("panic: %s\n", s);
+	for(;;)
+		idle();
+}
+
+/*
+ * prdev prints a warning message of the
+ * form "mesg on dev x/y".
+ * x and y are the major and minor parts of
+ * the device argument.
+ */
+prdev(str, dev)
+char *str;
+dev_t dev;
+{
+
+	printf("%s on dev %u/%u\n", str, major(dev), minor(dev));
+}
+
+/*
+ * deverr prints a diagnostic from
+ * a device driver.
+ * It prints the device, block number,
+ * and an octal word (usually some error
+ * status register) passed as argument.
+ */
+deverror(bp, o1, o2)
+register struct buf *bp;
+{
+
+	prdev("err", bp->b_dev);
+	printf("bn=%D er=%o,%o\n", bp->b_blkno, o1, o2);
+}