From: Alessandro Ratti <alessandro@0x65c.net>
Date: Sun, 28 Dec 2025 18:11:08 +0000 (+0100)
Subject: tests: add libsmartcols termreduce regression helper
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=34ebd2a75992472d8569ea262c64a2fef45c255c;p=thirdparty%2Futil-linux.git

tests: add libsmartcols termreduce regression helper

Add a small test helper program that creates a libsmartcols table,
applies scols_table_reduce_termwidth(), and prints the table multiple
times within the same process.

The helper is used by regression tests to detect unintended cumulative
width reduction across repeated printing.

Signed-off-by: Alessandro Ratti <alessandro@0x65c.net>
---

diff --git a/tests/helpers/Makemodule.am b/tests/helpers/Makemodule.am
index f87675350..e1cac2f78 100644
--- a/tests/helpers/Makemodule.am
+++ b/tests/helpers/Makemodule.am
@@ -1,3 +1,9 @@
+if !OSS_FUZZ
+check_PROGRAMS += test_scols_termreduce
+test_scols_termreduce_SOURCES = tests/helpers/test_scols_termreduce.c
+test_scols_termreduce_LDADD = $(LDADD) libsmartcols.la
+endif
+
 check_PROGRAMS += test_mbsencode
 test_mbsencode_SOURCES = tests/helpers/test_mbsencode.c
 test_mbsencode_LDADD = $(LDADD) libcommon.la
diff --git a/tests/helpers/test_scols_termreduce.c b/tests/helpers/test_scols_termreduce.c
new file mode 100644
index 000000000..c96ce6d9b
--- /dev/null
+++ b/tests/helpers/test_scols_termreduce.c
@@ -0,0 +1,69 @@
+/*
+ * test_scols_termreduce.c
+ *
+ * Regression test helper for libsmartcols.
+ *
+ * Verify that calling scols_table_reduce_termwidth() does not cause
+ * cumulative width reduction when printing is repeated in the same process.
+ *
+ * This helper prints the same multiple times. All outputs must be identical:
+ *   - All prints:   width = 40 - 4 = 36 (constant)
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libsmartcols/src/libsmartcols.h"
+
+#define TEST_TERMWIDTH 40
+#define TEST_TERMREDUCE 4
+#define NUM_ITERATIONS 3
+
+int main(void)
+{
+	struct libscols_table *tb;
+	struct libscols_column *cl;
+	struct libscols_line *ln;
+	int i;
+	const char *longstr =
+		"THIS-IS-A-VERY-LONG-STRING-THAT-WOULD-BE-TRUNCATED";
+
+	tb = scols_new_table();
+	if (!tb)
+		return EXIT_FAILURE;
+
+	/* Make output deterministic */
+	scols_table_set_termwidth(tb, TEST_TERMWIDTH);
+
+	/* Force terminal mode */
+	scols_table_set_termforce(tb, SCOLS_TERMFORCE_ALWAYS);
+
+	/* Exercise termreduce handling */
+	scols_table_reduce_termwidth(tb, TEST_TERMREDUCE);
+
+	/* One truncated column */
+	cl = scols_table_new_column(tb, "DATA", 0, SCOLS_FL_TRUNC);
+	if (!cl)
+		goto err;
+
+	ln = scols_table_new_line(tb, NULL);
+	if (!ln)
+		goto err;
+
+	if (scols_line_set_data(ln, 0, longstr) != 0)
+		goto err;
+
+	/* Print multiple times - output must be identical */
+	for (i = 0; i < NUM_ITERATIONS; i++) {
+		scols_print_table(tb);
+	}
+
+	scols_unref_table(tb);
+	return EXIT_SUCCESS;
+
+err:
+	scols_unref_table(tb);
+	return EXIT_FAILURE;
+}