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