From bc41d39f27c7467970b751ed3ebea28b00a8a0b3 Mon Sep 17 00:00:00 2001
From: Danny Holman <dholman@gymli.org>
Date: Thu, 22 Aug 2024 20:58:03 -0500
Subject: core: add a basic logging framework

Add a basic framework for logging messages to the console or to a file.

Signed-off-by: Danny Holman <dholman@gymli.org>
---
 .gitignore             |  4 ++++
 include/rune_logging.h | 16 ++++++++++++++++
 src/logging.c          | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+)
 create mode 100644 include/rune_logging.h
 create mode 100644 src/logging.c

diff --git a/.gitignore b/.gitignore
index 78e4e10..29cd635 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,6 +17,7 @@
 *.lzo
 *.o
 *.o.*
+*.out
 *.patch
 *.so
 *.tar
@@ -32,3 +33,6 @@ cscope.*
 ncscope.*
 tags
 TAGS
+
+# Output directory
+bin/
diff --git a/include/rune_logging.h b/include/rune_logging.h
new file mode 100644
index 0000000..a0b9e29
--- /dev/null
+++ b/include/rune_logging.h
@@ -0,0 +1,16 @@
+#ifndef RUNE_LOGGING_H
+#define RUNE_LOGGING_H
+
+#include <rune_types.h>
+
+enum log_level {
+        LOG_FATAL,
+        LOG_ERROR,
+        LOG_WARN,
+        LOG_INFO,
+        LOG_DEBUG
+};
+
+void log_output(int level, const char *fmt, ...);
+
+#endif
diff --git a/src/logging.c b/src/logging.c
new file mode 100644
index 0000000..e755710
--- /dev/null
+++ b/src/logging.c
@@ -0,0 +1,40 @@
+#include <rune_logging.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+
+#define LSTR_FATAL      "[FATAL]"
+#define LSTR_ERROR      "[ERROR]"
+#define LSTR_WARN       "[WARNING]"
+#define LSTR_INFO       "[INFO]"
+#define LSTR_DEBUG      "[DEBUG]"
+
+void log_output(int level, const char *fmt, ...) {
+        char out[8192];
+        memset(out, 0, sizeof(out));
+
+        va_list arg_ptr;
+        va_start(arg_ptr, fmt);
+        vsnprintf(out, 8192, fmt, arg_ptr);
+        va_end(arg_ptr);
+
+        char *lvl_str;
+        switch (level) {
+                case LOG_FATAL:
+                        lvl_str = LSTR_FATAL;
+                        break;
+                case LOG_ERROR:
+                        lvl_str = LSTR_ERROR;
+                        break;
+                case LOG_WARN:
+                        lvl_str = LSTR_WARN;
+                        break;
+                case LOG_INFO:
+                        lvl_str = LSTR_INFO;
+                        break;
+                case LOG_DEBUG:
+                        lvl_str = LSTR_DEBUG;
+                        break;
+        }
+        printf("%s %s\n", lvl_str, out);
+}
-- 
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