add logging.h

src/logging.h

@@ -0,0 +1,85 @@
+/**
+ *
+ * Copyright (c) 2010, Zed A. Shaw and Mongrel2 Project Contributors.
+ * 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 Mongrel2 Project, Zed A. Shaw, 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.
+ */
+
+#ifndef __dbg_h__
+#define __dbg_h__
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+// extern FILE *LOG_FILE; replace stderr with logfile if desire
+// #define LOG_DEST LOG_FILE
+#define LOG_DEST stderr
+
+
+#ifdef NDEBUG
+#define debug(M, ...)
+#else
+#define debug(M, ...) fprintf(LOG_DEST, "[DEBUG] %s:%d: " M "\n", __FILE__, __LINE__, ##__VA_ARGS__)
+#endif
+
+
+// do not try to be smart and make this go away on NDEBUG, the _debug
+// here means that it just doesn't print a message, it still does the
+// check.  MKAY?
+#define check_debug(A, M, ...) if(!(A)) { debug(M, ##__VA_ARGS__); errno=0; goto error; }
+
+#define clean_errno() (errno == 0 ? "None" : strerror(errno))
+
+#ifdef NO_LINENOS
+// versions that don't feature line numbers
+#define log_err(M, ...) fprintf(LOG_DEST, "[ERROR] errno: %s: " M "\n", clean_errno(), ##__VA_ARGS__)
+#define log_warn(M, ...) fprintf(LOG_DEST, "[WARN] errno: %s: " M "\n", clean_errno(), ##__VA_ARGS__)
+#define log_info(M, ...) fprintf(LOG_DEST, "[INFO] " M "\n", ##__VA_ARGS__)
+#else
+#define log_err(M, ...) fprintf(LOG_DEST, "[ERROR] %s:%d: errno: %s: " M "\n", __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
+#define log_warn(M, ...) fprintf(LOG_DEST, "[WARN] %s:%d: errno: %s: " M "\n", __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
+#define log_info(M, ...) fprintf(LOG_DEST, "[INFO] %s:%d: " M "\n", __FILE__, __LINE__, ##__VA_ARGS__)
+#endif
+
+#define check(A, M, ...) if(!(A)) { log_err(M, ##__VA_ARGS__); errno=0; goto error; }
+
+#define sentinel(M, ...)  { log_err(M, ##__VA_ARGS__); errno=0; goto error; }
+
+#define check_mem(A) check((A), "Out of memory.")
+
+#define TRACE(C,E) debug("--> %s(%s:%d) %s:%d ", "" #C, State_event_name(E), E, __FUNCTION__, __LINE__)
+
+#define error_response(F, C, M, ...)  {Response_send_status(F, &HTTP_##C); sentinel(M, ##__VA_ARGS__);}
+
+#define error_unless(T, F, C, M, ...) if(!(T)) error_response(F, C, M, ##__VA_ARGS__)
+
+
+#endif