[libvirt] [PATCH 1/2] virstring: Reimplement g_strdup_printf() and g_strdup_vprintf()

[Michal Privoznik]

These functions don't really abort() on OOM. The fix was merged
upstream, but not in the minimal version we require. Provide our
own implementation which can be removed once we bump the minimal
version.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---

Dan claims this is fixed upstream, but I'm failing to see any abort() in
current master:

https://gitlab.gnome.org/GNOME/glib/blob/master/glib/gprintf.c#L320

There is g_new() called, but it's done so only in one case out of three.
On my system, HAVE_VASPRINTF is defined meaning the function still won't
abort().

 src/libvirt_private.syms |  2 ++
 src/util/virstring.c     | 29 +++++++++++++++++++++++++++++
 src/util/virstring.h     | 11 +++++++++++
 3 files changed, 42 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 0da02bb8bd..9eac489a32 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -3060,6 +3060,8 @@ virStorageFileBackendRegister;
 
 
 # util/virstring.h
+vir_g_strdup_printf;
+vir_g_strdup_vprintf;
 virAsprintfInternal;
 virSkipSpaces;
 virSkipSpacesAndBackslash;
diff --git a/src/util/virstring.c b/src/util/virstring.c
index 6453a23ada..fa7b15d0b7 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -768,6 +768,35 @@ virAsprintfInternal(char **strp,
     return ret;
 }
 
+
+/* Due to a bug in glib, g_strdup_printf() nor g_strdup_vprintf()
+ * abort on OOM.  It's fixed in glib's upstream. Provide our own
+ * implementation until the fix get's distributed. */
+char *
+vir_g_strdup_printf(const char *msg, ...)
+{
+  va_list args;
+  char *ret;
+  va_start(args, msg);
+  ret = g_strdup_vprintf(msg, args);
+  if (!ret)
+    abort();
+  va_end(args);
+  return ret;
+}
+
+
+char *
+vir_g_strdup_vprintf(const char *msg, va_list args)
+{
+  char *ret;
+  ret = g_strdup_vprintf(msg, args);
+  if (!ret)
+    abort();
+  return ret;
+}
+
+
 /**
  * virStrncpy:
  *
diff --git a/src/util/virstring.h b/src/util/virstring.h
index f5e2302b8b..b3a85b9ac2 100644
--- a/src/util/virstring.h
+++ b/src/util/virstring.h
@@ -253,6 +253,17 @@ size_t virStringListLength(const char * const *strings);
 
 #define virAsprintfQuiet(strp, ...) virAsprintf(strp, __VA_ARGS__)
 
+char *vir_g_strdup_printf(const char *msg, ...)
+    G_GNUC_PRINTF(1, 2);
+char *vir_g_strdup_vprintf(const char *msg, va_list args)
+    G_GNUC_PRINTF(1, 0);
+
+#if !GLIB_CHECK_VERSION(2, 64, 0)
+# define g_strdup_printf vir_g_strdup_printf
+# define g_strdup_vprintf vir_g_strdup_vprintf
+#endif
+
+
 int virStringSortCompare(const void *a, const void *b);
 int virStringSortRevCompare(const void *a, const void *b);
 int virStringToUpper(char **dst, const char *src);
-- 
2.21.0