init

LICENSE.md

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+BSD 2-Clause License
+
+Copyright (c) 2018, Muresan Vlad Mihail
+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.
+
+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.

README.md

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+```c 
+#include "logger.h"
+
+int main() {
+	log_info("Starting!");
+	log_warning("This is a warning!");
+	log_error("This shoudn't have happened!");
+	return 0;
+}
+```
+
+OUTPUT: 
+
+Tue Nov  6 13:18:11 2018
+INFO main.c:4: Starting!
+
+Tue Nov  6 13:18:11 2018
+WARNING main.c:5: This is a warning!
+
+Tue Nov  6 13:18:11 2018
+ERROR main.c:6: This shoudn't have happened!

example.c

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+#include "logger.h"
+
+int main() {
+	log_info("Starting! %s", "123\n");
+	log_warning("This is a warning!");
+	log_error("This shoudn't have happened!");
+	return 0;
+}

logger.c

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+#include "logger.h"
+
+void _logger(int level, char *file, int line, char* format, ...) {
+
+	time_t t = time(NULL);
+
+	switch (level) {
+		case LOG_LEVEL_ERROR:
+			fprintf(stderr, "%sERROR %s:%d: ", asctime(localtime(&t)), file, line);
+			break;
+		case LOG_LEVEL_WARNING:
+			fprintf(stderr, "%sWARNING %s:%d: ", asctime(localtime(&t)), file, line);
+			break;
+		case LOG_LEVEL_INFO:
+			fprintf(stdout, "%sINFO %s:%d: ", asctime(localtime(&t)), file, line);
+			break;
+		case LOG_LEVEL_DEBUG:
+			fprintf(stdout, "%sDEBUG %s:%d: ", asctime(localtime(&t)), file, line);
+			break;
+	}
+	va_list args;
+
+	va_start(args, format);
+	vprintf(format, args);
+	va_end(args);
+	printf("\n");
+}

logger.h

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+#ifndef _LOGGER_H_
+#define _LOGGER_H_
+
+#include <stdio.h>
+#include <time.h>
+#include <stdarg.h>
+
+#define log_error(...) _logger(LOG_LEVEL_ERROR, __FILE__, __LINE__,  __VA_ARGS__)
+#define log_warning(...) _logger(LOG_LEVEL_WARNING, __FILE__, __LINE__,__VA_ARGS__)
+#define log_info(...) _logger(LOG_LEVEL_INFO, __FILE__, __LINE__,  __VA_ARGS__)
+#define log_debug(...) _logger(LOG_LEVEL_DEBUG, __FILE__, __LINE__,  __VA_ARGS__)
+
+enum {
+	LOG_LEVEL_ERROR,
+	LOG_LEVEL_WARNING,
+	LOG_LEVEL_INFO,
+	LOG_LEVEL_DEBUG
+} LOG_LEVEL;
+
+void _logger(int level, char *file, int line, char *format, ...);
+
+#endif

run.sh

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+gcc logger.h logger.c example.c -o out && ./out