All of the trace functions treat a NULL key as a synonym for
the default GIT_TRACE key. Except for trace_disable(), which
will segfault.
Fortunately, this can't cause any bugs, as the function has
no callers. But rather than drop it, let's fix the bug, as I
plan to add a caller.
Signed-off-by: Jeff King <p...@peff.net>
---
trace.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/trace.c b/trace.c
index 4aeea60..f204a7d 100644
--- a/trace.c
+++ b/trace.c
@@ -25,15 +25,25 @@
#include "cache.h"
#include "quote.h"
+/*
+ * "Normalize" a key argument by converting NULL to our trace_default,
+ * and otherwise passing through the value. All caller-facing functions
+ * should normalize their inputs in this way, though most get it
+ * for free by calling get_trace_fd() (directly or indirectly).
+ */
+static void normalize_trace_key(struct trace_key **key)
+{
+ static struct trace_key trace_default = { "GIT_TRACE" };
+ if (!*key)
+ *key = &trace_default;
+}
+
/* Get a trace file descriptor from "key" env variable. */
static int get_trace_fd(struct trace_key *key)
{
- static struct trace_key trace_default = { "GIT_TRACE" };
const char *trace;
- /* use default "GIT_TRACE" if NULL */
- if (!key)
- key = &trace_default;
+ normalize_trace_key(&key);
/* don't open twice */
if (key->initialized)
@@ -75,6 +85,8 @@ static int get_trace_fd(struct trace_key *key)
void trace_disable(struct trace_key *key)
{
+ normalize_trace_key(&key);
+
if (key->need_close)
close(key->fd);
key->fd = 0;
--
2.9.2.670.g42e63de
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