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author | Karel Zak | 2016-02-19 16:47:38 +0100 |
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committer | Karel Zak | 2016-02-19 16:47:38 +0100 |
commit | 12ca9cb1f5efdbdbca3c4a9c4f685634b2c13221 (patch) | |
tree | 173fc7adce50d87d0c96c178dc3d032103846ee7 /libsmartcols/samples | |
parent | libsmartcols: support continuous printing (diff) | |
download | kernel-qcow2-util-linux-12ca9cb1f5efdbdbca3c4a9c4f685634b2c13221.tar.gz kernel-qcow2-util-linux-12ca9cb1f5efdbdbca3c4a9c4f685634b2c13221.tar.xz kernel-qcow2-util-linux-12ca9cb1f5efdbdbca3c4a9c4f685634b2c13221.zip |
libsmartcols: add sample-scols-continuous
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'libsmartcols/samples')
-rw-r--r-- | libsmartcols/samples/Makemodule.am | 8 | ||||
-rw-r--r-- | libsmartcols/samples/continuous.c | 128 |
2 files changed, 135 insertions, 1 deletions
diff --git a/libsmartcols/samples/Makemodule.am b/libsmartcols/samples/Makemodule.am index 264325535..9c8869208 100644 --- a/libsmartcols/samples/Makemodule.am +++ b/libsmartcols/samples/Makemodule.am @@ -2,7 +2,8 @@ check_PROGRAMS += \ sample-scols-tree \ sample-scols-title \ - sample-scols-wrap + sample-scols-wrap \ + sample-scols-continuous sample_scols_tree_SOURCES = libsmartcols/samples/tree.c sample_scols_tree_LDADD = libsmartcols.la libcommon.la @@ -15,3 +16,8 @@ sample_scols_title_CFLAGS = -I$(ul_libsmartcols_incdir) sample_scols_wrap_SOURCES = libsmartcols/samples/wrap.c sample_scols_wrap_LDADD = libsmartcols.la sample_scols_wrap_CFLAGS = -I$(ul_libsmartcols_incdir) + +sample_scols_continuous_SOURCES = libsmartcols/samples/continuous.c +sample_scols_continuous_LDADD = libsmartcols.la libcommon.la +sample_scols_continuous_CFLAGS = -I$(ul_libsmartcols_incdir) + diff --git a/libsmartcols/samples/continuous.c b/libsmartcols/samples/continuous.c new file mode 100644 index 000000000..2fe720e2f --- /dev/null +++ b/libsmartcols/samples/continuous.c @@ -0,0 +1,128 @@ +/* + * 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) +{ + if (!scols_table_new_column(tb, "#NUM", 0, SCOLS_FL_RIGHT)) + goto fail; + if (!scols_table_new_column(tb, "DATA", 0, 0)) + goto fail; + if (!scols_table_new_column(tb, "TIME", 0, 0)) + goto fail; + return; +fail: + scols_unref_table(tb); + err(EXIT_FAILURE, "faild 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, "faild 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, "faild 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))); + + /* don't print line separator when in progress */ + scols_table_enable_nolinesep(tb, !done); + /* 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)); + } + } while (!done); + + last = now; + } + + scols_unref_table(tb); + return EXIT_SUCCESS; +} |