dd: Incorporate some changes from imp for status=progress

Notable changes from what landed in r337505:
- sigalarm handler isn't setup unless we're actually using it
- Humanized versions of the amount of data transferred in the progress
  update

Submitted by:	imp
Reviewed by:	kevans
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D16642

bin/dd/Makefile

@@ -6,6 +6,7 @@
 PACKAGE=runtime
 PROG=	dd
 SRCS=	args.c conv.c conv_tab.c dd.c misc.c position.c
+LIBADD= util
 
 #
 # Test the character conversion functions.  We have to be explicit about

bin/dd/dd.c

@@ -95,6 +95,8 @@ volatile sig_atomic_t need_progress;
 int
 main(int argc __unused, char *argv[])
 {
+	struct itimerval itv = { { 1, 0 }, { 1, 0 } }; /* SIGALARM every second, if needed */
+
 	(void)setlocale(LC_CTYPE, "");
 	jcl(argv);
 	setup();
@@ -104,7 +106,10 @@ main(int argc __unused, char *argv[])
 		err(1, "unable to enter capability mode");
 
 	(void)signal(SIGINFO, siginfo_handler);
-	(void)signal(SIGALRM, sigalrm_handler);
+	if (ddflags & C_PROGRESS) {
+		(void)signal(SIGALRM, sigalarm_handler);
+		setitimer(ITIMER_REAL, &itv, NULL);
+	}
 	(void)signal(SIGINT, terminate);
 
 	atexit(summary);
@@ -284,14 +289,6 @@ setup(void)
 		ctab = casetab;
 	}
 
-	if ((ddflags & C_PROGRESS)) {
-		struct itimerval timer = {
-			.it_interval = { .tv_sec = 1, .tv_usec = 0 },
-			.it_value = { .tv_sec = 1, .tv_usec = 0 },
-		};
-		setitimer(ITIMER_REAL, &timer, NULL);
-	}
-
 	if (clock_gettime(CLOCK_MONOTONIC, &st.start))
 		err(1, "clock_gettime");
 }
@@ -469,13 +466,11 @@ dd_in(void)
 
 		in.dbp += in.dbrcnt;
 		(*cfunc)();
-		if (need_summary) {
+		if (need_summary)
 			summary();
-		}
-		if (need_progress) {
+		if (need_progress)
 			progress();
 	}
-	}
 }
 
 /*

bin/dd/extern.h

@@ -45,10 +45,11 @@ void jcl(char **);
 void pos_in(void);
 void pos_out(void);
 double secs_elapsed(void);
+void progress(void);
 void summary(void);
 void progress(void);
+void sigalarm_handler(int);
 void siginfo_handler(int);
-void sigalrm_handler(int);
 void terminate(int);
 void unblock(void);
 void unblock_close(void);

bin/dd/misc.c

@@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$");
 #include <err.h>
 #include <errno.h>
 #include <inttypes.h>
+#include <libutil.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -56,8 +57,6 @@ __FBSDID("$FreeBSD$");
 #include "dd.h"
 #include "extern.h"
 
-static int need_newline;
-
 double
 secs_elapsed(void)
 {
@@ -85,7 +84,7 @@ summary(void)
 	if (ddflags & C_NOINFO)
 		return;
 
-	if (need_newline && !need_summary)
+	if (ddflags & C_PROGRESS)
 		fprintf(stderr, "\n");
 
 	secs = secs_elapsed();
@@ -110,22 +109,25 @@ summary(void)
 void
 progress(void)
 {
+	static int outlen;
+	char si[4 + 1 + 2 + 1];		/* 123 <space> <suffix> NUL */
+	char iec[4 + 1 + 2 + 1];	/* 123 <space> <suffix> NUL */
+	char persec[4 + 1 + 2 + 1];	/* 123 <space> <suffix> NUL */
+	char *buf;
 	double secs;
-	static int lastlen;
-	int len;
 
 	secs = secs_elapsed();
-	len = fprintf(stderr,
-	    "\r%ju bytes transferred in %.0f secs (%.0f bytes/sec)",
-	    st.bytes, secs, st.bytes / secs);
-
-	if (len > 0) {
-		if (len < lastlen)
-			(void)fprintf(stderr, "%*s", len - lastlen, "");
-		lastlen = len;
-	}
-
-	need_newline = 1;
+	humanize_number(si, sizeof(si), (int64_t)st.bytes, "B", HN_AUTOSCALE,
+	    HN_DECIMAL | HN_DIVISOR_1000);
+	humanize_number(iec, sizeof(iec), (int64_t)st.bytes, "B", HN_AUTOSCALE,
+	    HN_DECIMAL | HN_IEC_PREFIXES);
+	humanize_number(persec, sizeof(iec), (int64_t)(st.bytes / secs), "B",
+	    HN_AUTOSCALE, HN_DECIMAL | HN_DIVISOR_1000);
+	asprintf(&buf, "  %'ju bytes (%s, %s) transferred %.3fs, %s/s",
+	    (uintmax_t)st.bytes, si, iec, secs, persec);
+	outlen = fprintf(stderr, "%-*s\r", outlen, buf);
+	fflush(stderr);
+	free(buf);
 	need_progress = 0;
 }
 
@@ -139,7 +141,7 @@ siginfo_handler(int signo __unused)
 
 /* ARGSUSED */
 void
-sigalrm_handler(int signo __unused)
+sigalarm_handler(int signo __unused)
 {
 
 	need_progress = 1;

bin/dd/position.c

@@ -125,6 +125,8 @@ pos_in(void)
 				--cnt;
 			if (need_summary)
 				summary();
+			if (need_progress)
+				progress();
 			continue;
 		}