[PATCH v3 2/2] column: guard against negative padding

[Kristoffer Haugsbakk <code@khaugsbakk.name>]

Make sure that client code can’t pass in a negative padding by accident.

Suggested-by: Rubén Justo <rjusto@gmail.com>
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
---

Notes (series):
    Apparently these are the only publicly-visible functions that use this
    struct according to `column.h`.

 column.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/column.c b/column.c
index ff2f0abf399..50bbccc92ee 100644
--- a/column.c
+++ b/column.c
@@ -182,6 +182,8 @@ void print_columns(const struct string_list *list, unsigned int colopts,
 {
 	struct column_options nopts;
 
+	if (opts && (0 > opts->padding))
+		BUG("padding must be non-negative");
 	if (!list->nr)
 		return;
 	assert((colopts & COL_ENABLE_MASK) != COL_AUTO);
@@ -361,6 +363,8 @@ int run_column_filter(int colopts, const struct column_options *opts)
 {
 	struct strvec *argv;
 
+	if (opts && (0 > opts->padding))
+		BUG("padding must be non-negative");
 	if (fd_out != -1)
 		return -1;
 
-- 
2.43.0