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From 75130d739d206715a09619c7b7bf62613dab1d2b Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Wed, 7 Nov 2018 17:41:32 +0100
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Subject: [PATCH] format-table: optionally allow reversing the sort order for a
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column
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(cherry picked from commit a2c73e2d3823e878de7a7ee193631108c5fc5be0)
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Related: #1689832
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---
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src/basic/format-table.c | 22 +++++++++++++++++++++-
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src/basic/format-table.h | 1 +
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2 files changed, 22 insertions(+), 1 deletion(-)
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diff --git a/src/basic/format-table.c b/src/basic/format-table.c
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index 64b9eb4108..a3ff527e91 100644
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--- a/src/basic/format-table.c
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+++ b/src/basic/format-table.c
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@@ -107,6 +107,8 @@ struct Table {
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size_t *sort_map; /* The columns to order rows by, in order of preference. */
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size_t n_sort_map;
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+
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+ bool *reverse_map;
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};
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Table *table_new_raw(size_t n_columns) {
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@@ -215,6 +217,7 @@ Table *table_unref(Table *t) {
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free(t->data);
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free(t->display_map);
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free(t->sort_map);
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+ free(t->reverse_map);
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return mfree(t);
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}
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@@ -836,7 +839,7 @@ static int table_data_compare(const void *x, const void *y, void *userdata) {
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r = cell_data_compare(d, *a, dd, *b);
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if (r != 0)
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- return r;
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+ return t->reverse_map && t->reverse_map[t->sort_map[i]] ? -r : r;
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}
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/* Order identical lines by the order there were originally added in */
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@@ -1356,3 +1359,20 @@ size_t table_get_columns(Table *t) {
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assert(t->n_columns > 0);
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return t->n_columns;
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}
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+
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+int table_set_reverse(Table *t, size_t column, bool b) {
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+ assert(t);
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+ assert(column < t->n_columns);
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+
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+ if (!t->reverse_map) {
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+ if (!b)
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+ return 0;
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+
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+ t->reverse_map = new0(bool, t->n_columns);
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+ if (!t->reverse_map)
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+ return -ENOMEM;
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+ }
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+
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+ t->reverse_map[column] = b;
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+ return 0;
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+}
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diff --git a/src/basic/format-table.h b/src/basic/format-table.h
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index 2db2084062..07cb2351cb 100644
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--- a/src/basic/format-table.h
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+++ b/src/basic/format-table.h
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@@ -53,6 +53,7 @@ void table_set_header(Table *table, bool b);
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void table_set_width(Table *t, size_t width);
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int table_set_display(Table *t, size_t first_column, ...);
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int table_set_sort(Table *t, size_t first_column, ...);
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+int table_set_reverse(Table *t, size_t column, bool b);
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int table_print(Table *t, FILE *f);
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int table_format(Table *t, char **ret);
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