1 files changed, 386 insertions, 0 deletions
diff --git a/libraries/liblutil/meter.c b/libraries/liblutil/meter.c
new file mode 100644
index 0000000..7b5543c
--- /dev/null
+++ b/libraries/liblutil/meter.c
@@ -0,0 +1,386 @@
+/* meter.c - lutil_meter meters */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright (c) 2009 by Emily Backes, Symas Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was initially developed by Emily Backes for inclusion
+ * in OpenLDAP software.
+ */
+
+#include "portable.h"
+#include "lutil_meter.h"
+
+#include <ac/assert.h>
+#include <ac/string.h>
+
+int
+lutil_time_string (
+	char *dest,
+	int duration,
+	int max_terms)
+{
+	static const int time_div[] = {31556952,
+				       604800,
+				       86400,
+				       3600,
+				       60,
+				       1,
+				       0};
+	const int * time_divp = time_div;
+	static const char * time_name_ch = "ywdhms";
+	const char * time_name_chp = time_name_ch;
+	int term_count = 0;
+	char *buf = dest;
+	int time_quot;
+	
+	assert ( max_terms >= 2 ); /* room for "none" message */
+
+	if ( duration < 0 ) {
+		*dest = '\0';
+		return 1;
+	}
+	if ( duration == 0 ) {
+		strcpy( dest, "none" );
+		return 0;
+	}
+	while ( term_count < max_terms && duration > 0 ) {
+		if (duration > *time_divp) {
+			time_quot = duration / *time_divp;
+			duration %= *time_divp;
+			if (time_quot > 99) {
+				return 1;
+			} else {
+				*(buf++) = time_quot / 10 + '0';
+				*(buf++) = time_quot % 10 + '0';
+				*(buf++) = *time_name_chp;
+				++term_count;
+			}
+		}
+		if ( *(++time_divp) == 0) duration = 0;
+		++time_name_chp;
+	}
+	*buf = '\0';
+	return 0;
+}
+
+int
+lutil_get_now (double *now)
+{
+#ifdef HAVE_GETTIMEOFDAY
+	struct timeval tv;
+
+	assert( now );
+	gettimeofday( &tv, NULL );
+	*now = ((double) tv.tv_sec) + (((double) tv.tv_usec) / 1000000.0);
+	return 0;
+#else
+	time_t tm;
+
+	assert( now );
+	time( &tm );
+	*now = (double) tm;
+	return 0;
+#endif
+}
+
+int
+lutil_meter_open (
+	lutil_meter_t *meter,
+	const lutil_meter_display_t *display, 
+	const lutil_meter_estimator_t *estimator,
+	size_t goal_value)
+{
+	int rc;
+
+	assert( meter != NULL );
+	assert( display != NULL );
+	assert( estimator != NULL );
+
+	if (goal_value < 1) return -1;
+
+	memset( (void*) meter, 0, sizeof( lutil_meter_t ));
+	meter->display = display;
+	meter->estimator = estimator;
+	lutil_get_now( &meter->start_time );
+	meter->last_update = meter->start_time;
+	meter->goal_value = goal_value;
+	meter->last_position = 0;
+
+	rc = meter->display->display_open( &meter->display_data );
+	if( rc != 0 ) return rc;
+	
+	rc = meter->estimator->estimator_open( &meter->estimator_data );
+	if( rc != 0 ) {
+		meter->display->display_close( &meter->display_data );
+		return rc;
+	}
+	
+	return 0;
+}
+
+int
+lutil_meter_update (
+	lutil_meter_t *meter,
+	size_t position,
+	int force)
+{
+	static const double display_rate = 0.5;
+	double frac, cycle_length, speed, now;
+	time_t remaining_time, elapsed;
+	int rc;
+
+	assert( meter != NULL );
+
+	lutil_get_now( &now );
+
+	if ( !force && now - meter->last_update < display_rate ) return 0;
+
+	frac = ((double)position) / ((double) meter->goal_value);
+	elapsed = now - meter->start_time;
+	if (frac <= 0.0) return 0;
+	if (frac >= 1.0) {
+		rc = meter->display->display_update(
+			&meter->display_data,
+			1.0,
+			0,
+			(time_t) elapsed,
+			((double)position) / elapsed);
+	} else {
+		rc = meter->estimator->estimator_update( 
+			&meter->estimator_data, 
+			meter->start_time,
+			frac,
+			&remaining_time );
+		if ( rc == 0 ) {
+			cycle_length = now - meter->last_update;
+			speed = cycle_length > 0.0 ?
+				((double)(position - meter->last_position)) 
+				/ cycle_length :
+				0.0;
+			rc = meter->display->display_update(
+				&meter->display_data,
+				frac,
+				remaining_time,
+				(time_t) elapsed,
+				speed);
+			if ( rc == 0 ) {
+				meter->last_update = now;
+				meter->last_position = position;
+			}
+		}
+	}
+
+	return rc;
+}
+
+int
+lutil_meter_close (lutil_meter_t *meter)
+{
+	meter->estimator->estimator_close( &meter->estimator_data );
+	meter->display->display_close( &meter->display_data );
+
+	return 0;
+}
+
+/* Default display and estimator */
+typedef struct {
+	int buffer_length;
+	char * buffer;
+	int need_eol;
+	int phase;
+	FILE *output;
+} text_display_state_t;
+
+static int
+text_open (void ** display_datap)
+{
+	static const int default_buffer_length = 81;
+	text_display_state_t *data;
+
+	assert( display_datap != NULL );
+	data = calloc( 1, sizeof( text_display_state_t ));
+	assert( data != NULL );
+	data->buffer_length = default_buffer_length;
+	data->buffer = calloc( 1, default_buffer_length );
+	assert( data->buffer != NULL );
+	data->output = stderr;
+	*display_datap = data;
+	return 0;
+}
+
+static int
+text_update ( 
+	void **display_datap,
+	double frac,
+	time_t remaining_time,
+	time_t elapsed,
+	double byte_rate)
+{
+	text_display_state_t *data;
+	char *buf, *buf_end;
+
+	assert( display_datap != NULL );
+	assert( *display_datap != NULL );
+	data = (text_display_state_t*) *display_datap;
+
+	if ( data->output == NULL ) return 1;
+
+	buf = data->buffer;
+	buf_end = buf + data->buffer_length - 1;
+
+/* |#################### 100.00% eta  1d19h elapsed 23w 7d23h15m12s spd nnnn.n M/s */
+
+	{
+		/* spinner */
+		static const int phase_mod = 8;
+		static const char phase_char[] = "_.-*\"*-.";
+		*buf++ = phase_char[data->phase % phase_mod];
+		data->phase++;
+	}
+
+	{
+		/* bar */
+		static const int bar_length = 20;
+		static const double bar_lengthd = 20.0;
+		static const char fill_char = '#';
+		static const char blank_char = ' ';
+		char *bar_end = buf + bar_length;
+		char *bar_pos = frac < 0.0 ? 
+			buf :
+			frac < 1.0 ?
+			buf + (int) (bar_lengthd * frac) :
+			bar_end;
+
+		assert( (buf_end - buf) > bar_length );
+		while ( buf < bar_end ) {
+			*buf = buf < bar_pos ?
+				fill_char : blank_char;
+			++buf;
+		}
+	}
+
+	{
+		/* percent */
+		(void) snprintf( buf, buf_end-buf, "%7.2f%%", 100.0*frac );
+		buf += 8;
+	}
+
+	{
+		/* eta and elapsed */
+		char time_buffer[19];
+		int rc;
+		rc = lutil_time_string( time_buffer, remaining_time, 2);
+		if (rc == 0)
+			snprintf( buf, buf_end-buf, " eta %6s", time_buffer );
+		buf += 5+6;
+		rc = lutil_time_string( time_buffer, elapsed, 5);
+		if (rc == 0)
+			snprintf( buf, buf_end-buf, " elapsed %15s", 
+				  time_buffer );
+		buf += 9+15;
+	}
+
+	{
+		/* speed */
+		static const char prefixes[] = " kMGTPEZY";
+		const char *prefix_chp = prefixes;
+
+		while (*prefix_chp && byte_rate >= 1024.0) {
+			byte_rate /= 1024.0;
+			++prefix_chp;
+		}
+		if ( byte_rate >= 1024.0 ) {
+			snprintf( buf, buf_end-buf, " fast!" );
+			buf += 6;
+		} else {
+			snprintf( buf, buf_end-buf, " spd %5.1f %c/s",
+				  byte_rate,
+				  *prefix_chp);
+			buf += 5+6+4;
+		}
+	}
+
+	(void) fprintf( data->output,
+			"\r%-79s", 
+			data->buffer );
+	data->need_eol = 1;
+	return 0;
+}
+
+static int
+text_close (void ** display_datap)
+{
+	text_display_state_t *data;
+
+	if (display_datap) {
+		if (*display_datap) {
+			data = (text_display_state_t*) *display_datap;
+			if (data->output && data->need_eol) 
+				fputs ("\n", data->output);
+			if (data->buffer)
+				free( data->buffer );
+			free( data );
+		}
+		*display_datap = NULL;
+	}
+	return 0;
+}
+
+static int
+null_open_close (void **datap)
+{
+	assert( datap );
+	*datap = NULL;
+	return 0;
+}
+
+static int
+linear_update (
+	void **estimator_datap, 
+	double start, 
+	double frac, 
+	time_t *remaining)
+{
+	double now;
+	double elapsed;
+	
+	assert( estimator_datap != NULL );
+	assert( *estimator_datap == NULL );
+	assert( start > 0.0 );
+	assert( frac >= 0.0 );
+	assert( frac <= 1.0 );
+	assert( remaining != NULL );
+	lutil_get_now( &now );
+
+	elapsed = now-start;
+	assert( elapsed >= 0.0 );
+
+	if ( frac == 0.0 ) {
+		return 1;
+	} else if ( frac >= 1.0 ) {
+		*remaining = 0;
+		return 0;
+	} else {
+		*remaining = (time_t) (elapsed/frac-elapsed+0.5);
+		return 0;
+	}
+}
+
+const lutil_meter_display_t lutil_meter_text_display = {
+	text_open, text_update, text_close
+};
+
+const lutil_meter_estimator_t lutil_meter_linear_estimator = {
+	null_open_close, linear_update, null_open_close
+};