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-rw-r--r--libsmartcols/samples/continuous.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/libsmartcols/samples/continuous.c b/libsmartcols/samples/continuous.c
new file mode 100644
index 0000000..6bdba6e
--- /dev/null
+++ b/libsmartcols/samples/continuous.c
@@ -0,0 +1,140 @@
+/*
+ * 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;
+ const size_t timecellsz = 500;
+ 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( timecellsz );
+
+ 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
+ */
+ if (scols_line_refer_data(line, COL_TIME, timecell) != 0)
+ err(EXIT_FAILURE, "failed to add data to table");
+
+ 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 */
+ snprintf(timecell, timecellsz, "%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;
+}