1 files changed, 140 insertions, 0 deletions
diff --git a/common/message.c b/common/message.c
new file mode 100644
index 0000000..8b54ad1
--- /dev/null
+++ b/common/message.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2011 Collabora Ltd
+ * Copyright (c) 2012 Stef Walter
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *     * Redistributions of source code must retain the above
+ *       copyright notice, this list of conditions and the
+ *       following disclaimer.
+ *     * Redistributions in binary form must reproduce the
+ *       above copyright notice, this list of conditions and
+ *       the following disclaimer in the documentation and/or
+ *       other materials provided with the distribution.
+ *     * The names of contributors to this software may not be
+ *       used to endorse or promote products derived from this
+ *       software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ *
+ * CONTRIBUTORS
+ *  Stef Walter <stef@thewalter.net>
+ */
+
+#include "config.h"
+
+#include "compat.h"
+#define P11_DEBUG_FLAG P11_DEBUG_LIB
+#include "debug.h"
+#include "message.h"
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+static bool print_messages = true;
+
+static char *
+default_message_storage (void)
+{
+	static char message[P11_MESSAGE_MAX] = { 0, };
+	return message;
+}
+
+/* Function pointer declared in message.h as extern */
+char * (* p11_message_storage) (void) = default_message_storage;
+
+void
+p11_message_store (const char* msg,
+                   size_t length)
+{
+	char *buffer;
+
+	/*
+	 * p11_message_storage() is called to get a storage location for
+	 * the last message. It defaults to a globally allocated buffer
+	 * but is overridden in library.c with a function that returns
+	 * per thread buffers.
+	 *
+	 * The returned value is P11_MESSAGE_MAX bytes long
+	 */
+	buffer = p11_message_storage ();
+
+	if (length > P11_MESSAGE_MAX - 1)
+		length = P11_MESSAGE_MAX - 1;
+
+	if (buffer != NULL) {
+		memcpy (buffer, msg, length);
+		buffer[length] = 0;
+	}
+}
+
+void
+p11_message (const char* msg,
+             ...)
+{
+	char buffer[P11_MESSAGE_MAX];
+	va_list va;
+	size_t length;
+
+	va_start (va, msg);
+	length = vsnprintf (buffer, P11_MESSAGE_MAX - 1, msg, va);
+	va_end (va);
+
+	/* Was it truncated? */
+	if (length > P11_MESSAGE_MAX - 1)
+		length = P11_MESSAGE_MAX - 1;
+	buffer[length] = 0;
+
+	/* If printing is not disabled, just print out */
+	if (print_messages)
+		fprintf (stderr, "p11-kit: %s\n", buffer);
+	else
+		p11_debug_message (P11_DEBUG_LIB, "message: %s", buffer);
+	p11_message_store (buffer, length);
+}
+
+void
+p11_message_quiet (void)
+{
+	print_messages = false;
+}
+
+void
+p11_message_loud (void)
+{
+	print_messages = true;
+}
+
+const char *
+p11_message_last (void)
+{
+	char *buffer;
+	buffer = p11_message_storage ();
+	return buffer && buffer[0] ? buffer : NULL;
+}
+
+void
+p11_message_clear (void)
+{
+	char *buffer;
+	buffer = p11_message_storage ();
+	if (buffer != NULL)
+		buffer[0] = 0;
+}