glibcompat: Reimplement g_strdup_printf() and g_strdup_vprintf()

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@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

src/internal.h

@@ -64,6 +64,7 @@
 #include "libvirt/virterror.h"
 
 #include "c-strcase.h"
+#include "glibcompat.h"
 
 /* Merely casting to (void) is not sufficient since the
  * introduction of the "warn_unused_result" attribute

src/libvirt_private.syms

@@ -1485,6 +1485,11 @@ virSecurityManagerTransactionStart;
 virSecurityManagerVerify;
 
 
+# util/glibcompat.h
+vir_g_strdup_printf;
+vir_g_strdup_vprintf;
+
+
 # util/viralloc.h
 virAlloc;
 virAllocN;

src/util/Makefile.inc.am

@@ -3,6 +3,8 @@
 # These files are not related to driver APIs. Simply generic
 # helper APIs for various purposes
 UTIL_SOURCES = \
+	util/glibcompat.c \
+	util/glibcompat.h \
 	util/viralloc.c \
 	util/viralloc.h \
 	util/virarch.c \

src/util/glibcompat.c

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+
+#include "glibcompat.h"
+
+#undef g_strdup_printf
+#undef g_strdup_vprintf
+
+/* 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 gets 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;
+}

src/util/glibcompat.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <glib.h>
+
+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