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+/**************************************************************************//**
+ * @file
+ * Wrapper for event logging built on syslog.
+ *
+ * License
+ * -------
+ *
+ * Copyright(c) <2016>, AT&T Intellectual Property. All other rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement: This product includes
+ * software developed by the AT&T.
+ * 4. Neither the name of AT&T 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 AT&T INTELLECTUAL PROPERTY ''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 AT&T INTELLECTUAL PROPERTY 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 <string.h>
+#include <assert.h>
+#include <syslog.h>
+#include <stdlib.h>
+#include <sys/time.h>
+
+#include <curl/curl.h>
+
+#include "evel.h"
+
+
+/*****************************************************************************/
+/* Debug settings. Logging is done through macros so these need to be */
+/* externally visible. */
+/*****************************************************************************/
+EVEL_LOG_LEVELS debug_level = EVEL_LOG_DEBUG;
+//static char *syslog_ident = "evel";
+int debug_indent = 0;
+
+/*****************************************************************************/
+/* Buffers for error strings from this library. */
+/*****************************************************************************/
+static char evel_err_string[EVEL_MAX_ERROR_STRING_LEN] = "<NULL>";
+
+
+/**************************************************************************//**
+ * Initialize logging
+ *
+ * @param[in] level The debugging level - one of ::EVEL_LOG_LEVELS.
+ * @param[in] ident The identifier for our logs.
+ *****************************************************************************/
+void log_initialize(EVEL_LOG_LEVELS level, const char * ident)
+{
+ assert(level < EVEL_LOG_MAX);
+ assert(ident != NULL);
+
+ debug_level = level;
+ openlog(ident, LOG_PID, LOG_USER);
+}
+
+/**************************************************************************//**
+ * Descriptive text for library errors.
+ *
+ * Return a text error string that relates to the last failure. May be
+ * "<null>" but will never be NULL.
+ *
+ * @returns Text error string.
+ *
+ * @note Must not be freed!
+ *****************************************************************************/
+const char * evel_error_string(void)
+{
+ return(evel_err_string);
+}
+
+/***************************************************************************//*
+ * Store the formatted string into the static error string and log the error.
+ *
+ * @param format Error string in standard printf format.
+ * @param ... Variable parameters to be substituted into the format string.
+ *****************************************************************************/
+void log_error_state(char * format, ...)
+{
+ va_list largs;
+
+ assert(format != NULL);
+ va_start(largs, format);
+ vsnprintf(evel_err_string, EVEL_MAX_ERROR_STRING_LEN, format, largs);
+ va_end(largs);
+ EVEL_ERROR("%s", evel_err_string);
+}
+
+
+/**************************************************************************//**
+ * Generate a debug log.
+ *
+ * Provides an interface to syslog with formatting of the nesting level
+ * so that it's easier to see function entry/exit.
+ *
+ * @param[in] level The debug level - see ::EVEL_LOG_LEVELS.
+ * @param[in] format The output formatting in printf style.
+ * @param[in] ... Variable arguments as specified in the format string.
+ *****************************************************************************/
+void log_debug(EVEL_LOG_LEVELS level, char * format, ...)
+{
+ va_list largs;
+ int priority;
+ char indent_fmt[1024];
+ char *syslog_fmt = NULL;
+
+ /***************************************************************************/
+ /* Test assumptions. */
+ /***************************************************************************/
+ assert(format != NULL);
+ assert(level <= EVEL_LOG_MAX);
+
+ if (level >= debug_level)
+ {
+ if ((debug_level == EVEL_LOG_INFO) || (debug_indent == 0))
+ {
+ /***********************************************************************/
+ /* Just use the format as is. */
+ /***********************************************************************/
+ syslog_fmt = format;
+ }
+ else
+ {
+ /***********************************************************************/
+ /* Combine the format with a preceding number of indent markers. */
+ /***********************************************************************/
+ sprintf(indent_fmt, "%.*s%s",
+ debug_indent,
+ INDENT_SEPARATORS,
+ format);
+ syslog_fmt = indent_fmt;
+ }
+
+ /*************************************************************************/
+ /* Work out the syslog priority value. */
+ /*************************************************************************/
+ switch (level)
+ {
+ case EVEL_LOG_ERROR:
+ priority = LOG_ERR;
+ break;
+
+ case EVEL_LOG_INFO:
+ priority = LOG_INFO;
+ break;
+
+ case EVEL_LOG_DEBUG:
+ case EVEL_LOG_SPAMMY:
+ default:
+ priority = LOG_DEBUG;
+ break;
+ }
+
+ /*************************************************************************/
+ /* Write the log to the file next, which requires the var args list. */
+ /*************************************************************************/
+ va_start(largs, format);
+ vsyslog(priority, syslog_fmt, largs);
+ va_end(largs);
+ }
+} \ No newline at end of file