From 7c8dd2672337a760477049e9f6196054332e4f5a Mon Sep 17 00:00:00 2001
From: Rob Austein <sra@hactrn.net>
Date: Sat, 15 Apr 2017 16:34:39 -0400
Subject: Logging infrastructure.

---
 Makefile       |  2 +-
 hal_internal.h | 12 +++++++++
 logging.c      | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 95 insertions(+), 1 deletion(-)
 create mode 100644 logging.c

diff --git a/Makefile b/Makefile
index 890d275..8f2f998 100644
--- a/Makefile
+++ b/Makefile
@@ -97,7 +97,7 @@ endif
 # just "building this is harmless even if we don't use it."
 
 OBJ += errorstrings.o hash.o asn1.o ecdsa.o rsa.o xdr.o slip.o
-OBJ += rpc_api.o rpc_hash.o uuid.o rpc_pkcs1.o crc32.o locks.o
+OBJ += rpc_api.o rpc_hash.o uuid.o rpc_pkcs1.o crc32.o locks.o logging.o
 
 # Object files to build when we're on a platform with direct access
 # to our hardware (Verilog) cores.
diff --git a/hal_internal.h b/hal_internal.h
index 1822781..f17179c 100644
--- a/hal_internal.h
+++ b/hal_internal.h
@@ -98,6 +98,18 @@ extern void hal_critical_section_end(void);
 extern void hal_ks_lock(void);
 extern void hal_ks_unlock(void);
 
+/*
+ * Logging.
+ */
+
+
+typedef enum {
+  HAL_LOG_DEBUG, HAL_LOG_INFO, HAL_LOG_WARN, HAL_LOG_ERROR, HAL_LOG_SILENT
+} hal_log_level_t;
+
+extern void hal_log_set_level(const hal_log_level_t level);
+extern void hal_log(const hal_log_level_t level, const char *format, ...);
+
 /*
  * Dispatch structures for RPC implementation.
  *
diff --git a/logging.c b/logging.c
new file mode 100644
index 0000000..06ee371
--- /dev/null
+++ b/logging.c
@@ -0,0 +1,82 @@
+/*
+ * logging.c
+ * ---------
+ * Default (stdio-based) logging code for libhal.
+ *
+ * Copyright (c) 2017, NORDUnet A/S All rights reserved.
+ *
+ * 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.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   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
+ * HOLDER 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.
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "hal.h"
+#include "hal_internal.h"
+
+/*
+ * Default stdio-based logging code.  Specific environments may supply
+ * something more appropriate (eg, on the Alpha, we want to log to the
+ * management port).
+ *
+ * See lock.c for comments on GNU weak functions.
+ */
+
+#ifndef ENABLE_WEAK_FUNCTIONS
+#define ENABLE_WEAK_FUNCTIONS 0
+#endif
+
+#if ENABLE_WEAK_FUNCTIONS
+#define WEAK_FUNCTION __attribute__((weak))
+#else
+#define WEAK_FUNCTION
+#endif
+
+static hal_log_level_t current_level;
+
+WEAK_FUNCTION void hal_log_set_level(const hal_log_level_t level)
+{
+  current_level = level;
+}
+
+WEAK_FUNCTION void hal_log(const hal_log_level_t level, const char *format, ...)
+{
+  if (level < current_level)
+    return;
+
+  va_list ap;
+  va_start(ap, format);
+  vfnprintf(stderr, format, ap);
+  va_end(ap);
+  fprintf(stderr, "\n");
+}
+
+/*
+ * Local variables:
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
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