From 11b7b07f8a15879134a54e73fade98d5e11e04f8 Mon Sep 17 00:00:00 2001 From: "Emilio G. Cota" Date: Mon, 25 Jul 2016 11:03:45 -0400 Subject: qdist: return "(empty)" instead of NULL when printing an empty dist Printf'ing a NULL string is undefined behaviour. Avoid it. Reported-by: Peter Maydell Signed-off-by: Emilio G. Cota Message-Id: <1469459025-23606-4-git-send-email-cota@braap.org> Signed-off-by: Paolo Bonzini --- util/qdist.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'util/qdist.c') diff --git a/util/qdist.c b/util/qdist.c index e95722b8a1..5f75e24c29 100644 --- a/util/qdist.c +++ b/util/qdist.c @@ -14,6 +14,8 @@ #define NAN (0.0 / 0.0) #endif +#define QDIST_EMPTY_STR "(empty)" + void qdist_init(struct qdist *dist) { dist->entries = g_new(struct qdist_entry, 1); @@ -233,7 +235,7 @@ char *qdist_pr_plain(const struct qdist *dist, size_t n) char *ret; if (dist->n == 0) { - return NULL; + return g_strdup(QDIST_EMPTY_STR); } qdist_bin__internal(&binned, dist, n); ret = qdist_pr_internal(&binned); @@ -308,7 +310,7 @@ char *qdist_pr(const struct qdist *dist, size_t n_bins, uint32_t opt) GString *s; if (dist->n == 0) { - return NULL; + return g_strdup(QDIST_EMPTY_STR); } s = g_string_new(""); -- cgit v1.2.3