Added sys_physzero library call for corresponding system call; modified

system-printf() so it returns number of characters printed (for use in
smart formatting)

lib/other/asynchio.c

@@ -14,12 +14,12 @@
 #define time	_time
 #define write	_write
 #include <lib.h>
+#include <time.h>
 #include <sys/ioctl.h>
 #include <sys/asynchio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
-#include <time.h>
 #include <signal.h>
 
 #define IDLE		0

lib/syslib/Makefile

@@ -45,6 +45,7 @@ OBJECTS	= \
 	$(LIBSYS)(sys_signalrm.o) \
 	$(LIBSYS)(sys_flagalrm.o) \
 	$(LIBSYS)(sys_syncalrm.o) \
+	$(LIBSYS)(sys_physzero.o) \
 	$(LIBSYS)(taskcall.o) \
 
 $(LIBSYS):	$(OBJECTS)
@@ -165,6 +166,9 @@ $(LIBSYS)(sys_flagalrm.o):	sys_flagalrm.c
 $(LIBSYS)(sys_syncalrm.o):	sys_syncalrm.c
 	$(CC1) sys_syncalrm.c
 
+$(LIBSYS)(sys_physzero.o):	sys_physcp.c
+	$(CC1) sys_physzero.c
+
 $(LIBSYS)(taskcall.o):	taskcall.c
 	$(CC1) taskcall.c
 

lib/syslib/kprintf.c

@@ -17,10 +17,12 @@ int printf(fmt) char *fmt;
 /* Printf() uses kputc() to print characters. */
 void kputc(int c);
 
+#define count_kputc(c) do { charcount++; kputc(c); } while(0)
+
 int printf(const char *fmt, ...)
 #endif
 {
-	int c;
+	int c, charcount = 0;
 	enum { LEFT, RIGHT } adjust;
 	enum { LONG, INT } intsize;
 	int fill;
@@ -40,7 +42,7 @@ int printf(const char *fmt, ...)
 	while ((c= *fmt++) != 0) {
 		if (c != '%') {
 			/* Ordinary character. */
-			kputc(c);
+			count_kputc(c);
 			continue;
 		}
 
@@ -162,26 +164,26 @@ int printf(const char *fmt, ...)
 		string_print:
 			width -= len;
 			if (i < 0) width--;
-			if (fill == '0' && i < 0) kputc('-');
+			if (fill == '0' && i < 0) count_kputc('-');
 			if (adjust == RIGHT) {
-				while (width > 0) { kputc(fill); width--; }
+				while (width > 0) { count_kputc(fill); width--; }
 			}
-			if (fill == ' ' && i < 0) kputc('-');
-			while (len > 0) { kputc((unsigned char) *p++); len--; }
-			while (width > 0) { kputc(fill); width--; }
+			if (fill == ' ' && i < 0) count_kputc('-');
+			while (len > 0) { count_kputc((unsigned char) *p++); len--; }
+			while (width > 0) { count_kputc(fill); width--; }
 			break;
 
 			/* Unrecognized format key, echo it back. */
 		default:
-			kputc('%');
-			kputc(c);
+			count_kputc('%');
+			count_kputc(c);
 		}
 	}
 
 	/* Mark the end with a null (should be something else, like -1). */
 	kputc(0);
 	va_end(argp);
-	return 0;
+	return charcount;
 }
 
 /*

lib/syslib/sys_physzero.c

@@ -0,0 +1,16 @@
+#include "syslib.h"
+
+PUBLIC int sys_physzero(phys_bytes base, phys_bytes bytes)
+{
+/* Zero a block of data.  */
+
+  message mess;
+
+  if (bytes == 0L) return(OK);
+
+  mess.PZ_MEM_PTR = (char *) base;
+  mess.PZ_COUNT   = bytes;
+
+  return(_taskcall(SYSTASK, SYS_PHYSZERO, &mess));
+}
+