C: Add report

README.MD

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+# Code Snippets
+Small code snippets that might prove useful again in the future.
+
+## C
+* report: Easy to use report statement with log levels
+

c/report/report.c

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+/* ----------------------------------------------------------------------------
+ *                                   C-Report
+ * ----------------------------------------------------------------------------
+ * Author          : Markus Koch <markus@notsyncing.net>
+ * Contributors    : None
+ * License         : Mozilla Public License (MPL) Version 2
+ * ----------------------------------------------------------------------------
+*/
+
+#include "logging.h"
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+
+static enum log_level current_log_level = LL_INFO;
+
+static const char *ll_string[] = {
+	"\x1B[31m\x1B[1m[X] ",
+	"\x1B[31m[E] ",
+	"\x1B[33m[W] ",
+	"\x1B[32m[I] ",
+	"\x1B[34m[D] ",
+	"\x1B[34m[d] ",
+	"[?] "
+};
+
+int should_report(enum log_level log_level)
+{
+	return (log_level <= current_log_level);
+}
+
+enum log_level report(enum log_level log_level, const char *format, ...)
+{
+	va_list vargs;
+
+	if (log_level > LL_COUNT)
+		log_level = LL_COUNT;
+
+	if (should_report(log_level)) {
+		va_start(vargs, format);
+		fprintf(stderr, "%s", ll_string[log_level]);
+		vfprintf(stderr, format, vargs);
+		fprintf(stderr, "\x1B[0m\n");
+		va_end(vargs);
+	}
+
+	return log_level;
+}
+
+void set_log_level(enum log_level log_level)
+{
+	if (log_level >= LL_COUNT)
+		log_level = LL_COUNT - 1;
+	current_log_level = log_level;
+}
+
+enum log_level get_log_level()
+{
+	return current_log_level;
+}

c/report/report.h

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+/* ----------------------------------------------------------------------------
+ *                                   C-Report
+ * ----------------------------------------------------------------------------
+ * Author          : Markus Koch <markus@notsyncing.net>
+ * Contributors    : None
+ * License         : Mozilla Public License (MPL) Version 2
+ * ----------------------------------------------------------------------------
+*/
+
+
+#ifndef REPORT_H
+#define REPORT_H
+
+#include <errno.h>
+
+enum log_level {LL_CRITICAL = 0,
+		LL_ERROR,
+		LL_WARNING,
+		LL_INFO,
+		LL_DEBUG,
+		LL_NOISY,
+		LL_COUNT};
+int should_report(enum log_level log_level);
+enum log_level report(enum log_level log_level, const char *format, ...);
+void set_log_level(enum log_level log_level);
+enum log_level get_log_level();
+
+#endif // REPORT_H