From c85c6cc819eebc19ff9118f4182ff0f6ed7e39e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ilja=20Karta=C5=A1ov?= <elias@lowenware.com>
Date: Wed, 19 Jun 2019 21:04:14 +0200
Subject: [PATCH] Add log module

---
 log.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 log.h |  58 +++++++++++++++++++++++++++++++++
 2 files changed, 161 insertions(+)
 create mode 100644 log.c
 create mode 100644 log.h

diff --git a/log.c b/log.c
new file mode 100644
index 0000000..9de26fb
--- /dev/null
+++ b/log.c
@@ -0,0 +1,103 @@
+/******************************************************************************
+ *
+ *                Copyright (c) 2017-2019 by Löwenware Ltd
+ *             Please, refer LICENSE file for legal information
+ *
+ ******************************************************************************/
+
+/**
+ * @file log.c
+ * @author Ilja Kartašov <ik@lowenware.com>
+ * @brief cStuff log module source file
+ *
+ * @see https://lowenware.com/
+ */
+#include <time.h>
+#include "log.h"
+
+
+void
+cstuff_log_init(CStuffLog self, uint8_t level)
+{
+	self->target = stderr;
+	self->level = level;
+}
+
+
+void
+cstuff_log_release(CStuffLog self)
+{
+	if (self->target != stderr)
+		fclose(self->target);
+}
+
+
+CStuffRetcode
+cstuff_log_set_file(CStuffLog self, const char *filename)
+{
+	FILE *fp;
+
+	if (!(fp = fopen(filename, "a")))
+		return CSTUFF_SYSCALL_ERROR;
+
+	self->target = fp;
+	return CSTUFF_SUCCESS;
+}
+
+
+int
+cstuff_log_printf(CStuffLog self, int level, const char *format, ...)
+{
+	int result;
+	va_list vl;
+
+	va_start(vl, format);
+	result = cstuff_log_vprintf(self, level, format, vl);
+	va_end(vl);
+
+	return result;
+}
+
+
+int
+cstuff_log_vprintf(CStuffLog self, int level, const char *format, va_list vl)
+{
+	int result;
+
+	if (self->level & level) {
+		FILE *f = self->target;
+		char *label;
+		time_t rawtime;
+		char strtime[32+1];
+		struct tm timeinfo;
+
+		time(&rawtime);
+		localtime_r(&rawtime, &timeinfo);
+		strftime(strtime, 32, "%F %T", &timeinfo);
+
+		switch (level)
+		{
+		case CSTUFF_LOG_ERROR:
+			label = "!!";
+			break;
+		case CSTUFF_LOG_ALERT:
+			label = "~!";
+			break;
+		case CSTUFF_LOG_DEBUG:
+			label = "**";
+			break;
+		default:
+			label = "--";
+		}
+
+		result = fprintf(f, "%s %s ", strtime, label);
+		result += vfprintf(f, format, vl);
+		fputc('\n', f);
+		result++;
+		fflush(f);
+	} else {
+		result = 0;
+	}
+
+	return result;
+}
diff --git a/log.h b/log.h
new file mode 100644
index 0000000..d2b686c
--- /dev/null
+++ b/log.h
@@ -0,0 +1,58 @@
+/******************************************************************************
+ *
+ *                Copyright (c) 2017-2019 by Löwenware Ltd
+ *             Please, refer LICENSE file for legal information
+ *
+ ******************************************************************************/
+
+/**
+ * @file log.h
+ * @author Ilja Kartašov <ik@lowenware.com>
+ * @brief cStuff log module header file
+ *
+ * @see https://lowenware.com/cStuff/
+ */
+
+#ifndef CSTUFF_LOG_H_557ADEFE_2BE8_4B9B_A894_F08FF64008EF
+#define CSTUFF_LOG_H_557ADEFE_2BE8_4B9B_A894_F08FF64008EF
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include "retcode.h"
+
+#define CSTUFF_LOG_OFF      (0)
+#define CSTUFF_LOG_ERROR    (1<<0)
+#define CSTUFF_LOG_ALERT    (1<<1)
+#define CSTUFF_LOG_STATE    (1<<2)
+#define CSTUFF_LOG_DEBUG    (1<<3)
+#define CSTUFF_LOG_ALL      (0xFF)
+
+struct cstuff_log {
+	FILE     *target;
+	uint8_t   level;
+};
+
+typedef struct cstuff_log * CStuffLog;
+
+
+void
+cstuff_log_init(CStuffLog self, int level);
+
+
+void
+cstuff_log_release(CStuffLog self);
+
+
+CStuffRetcode
+cstuff_log_set_file(CStuffLog self, const char *filename);
+
+
+int
+cstuff_log_printf(CStuffLog self, int level, const char *format, ...);
+
+
+int
+cstuff_log_vprintf(CStuffLog self, int level, const char *format, va_list vl);
+
+#endif /* !CSTUFF_LOG_H */