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/*
* Copyright (C) 2016 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include "c.h"
#include "nls.h"
#include "strutils.h"
#include "xalloc.h"
#include "libsmartcols.h"
#define TIME_PERIOD 3.0 /* seconds */
enum { COL_NUM, COL_DATA, COL_TIME };
static double time_diff(struct timeval *a, struct timeval *b)
{
return (a->tv_sec - b->tv_sec) + (a->tv_usec - b->tv_usec) / 1E6;
}
/* add columns to the @tb */
static void setup_columns(struct libscols_table *tb)
{
scols_table_enable_maxout(tb, 1);
if (!scols_table_new_column(tb, "#NUM", 0.1, SCOLS_FL_RIGHT))
goto fail;
if (!scols_table_new_column(tb, "DATA", 0.7, 0))
goto fail;
if (!scols_table_new_column(tb, "TIME", 0.2, 0))
goto fail;
return;
fail:
scols_unref_table(tb);
err(EXIT_FAILURE, "failed to create output columns");
}
static struct libscols_line *add_line(struct libscols_table *tb, size_t i)
{
char *p;
struct libscols_line *ln = scols_table_new_line(tb, NULL);
if (!ln)
err(EXIT_FAILURE, "failed to create output line");
xasprintf(&p, "%zu", i);
if (scols_line_refer_data(ln, COL_NUM, p))
goto fail;
xasprintf(&p, "data-%02zu-%02zu-%02zu-end", i + 1, i + 2, i + 3);
if (scols_line_refer_data(ln, COL_DATA, p))
goto fail;
return ln;
fail:
scols_unref_table(tb);
err(EXIT_FAILURE, "failed to create output line");
}
int main(int argc, char *argv[])
{
struct libscols_table *tb;
size_t i;
struct timeval last;
scols_init_debug(0);
tb = scols_new_table();
if (!tb)
err(EXIT_FAILURE, "failed to create output table");
setup_columns(tb);
gettimeofday(&last, NULL);
for (i = 0; i < 10; i++) {
struct libscols_line *line;
struct timeval now;
int done = 0;
char *timecell = xmalloc( sizeof(stringify_value(UINT_MAX)) );
line = add_line(tb, i);
/* Make a reference from cell data to the buffer, then we can
* update cell data without any interaction with libsmartcols
*/
scols_line_refer_data(line, COL_TIME, timecell);
do {
double diff;
gettimeofday(&now, NULL);
diff = time_diff(&now, &last);
if (now.tv_sec == last.tv_sec + (long) TIME_PERIOD)
done = 1;
else
xusleep(100000);
/* update "TIME" cell data */
sprintf(timecell, "%f [%3d%%]", diff,
done ? 100 : (int)(diff / (TIME_PERIOD / 100.0)));
/* Note that libsmartcols don't print \n for last line
* in the table, but if you print a line somewhere in
* the midle of the table you need
*
* scols_table_enable_nolinesep(tb, !done);
*
* to disable line breaks. In this example it's
* unnecessary as we print the latest line only.
*/
/* print the line */
scols_table_print_range(tb, line, NULL);
if (!done) {
/* terminal is waiting for \n, fflush() to force output */
fflush(scols_table_get_stream(tb));
/* move to the begin of the line */
fputc('\r', scols_table_get_stream(tb));
} else
fputc('\n', scols_table_get_stream(tb));
} while (!done);
last = now;
}
scols_unref_table(tb);
return EXIT_SUCCESS;
}
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