From 3e4e10c1c1203d605aeceafa8f15e6a3a4aa8033 Mon Sep 17 00:00:00 2001
From: verdant <im@verdant.ee>
Date: Tue, 21 Jul 2026 18:53:18 +0800
Subject: Add logging system

---
 log.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 log.h | 16 ++++++++++++++++
 2 files changed, 73 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..305a666
--- /dev/null
+++ b/log.c
@@ -0,0 +1,57 @@
+#include "log.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "err.h"
+#include "utils.h"
+
+FILE* log_file = NULL;
+
+void log_init(void) {
+    if (is_debug()) {
+        log_file = fopen("./log", "a");
+    } else {
+        log_file = fopen(LOG_FILEPATH, "a");
+    }
+
+    if (!log_file) {
+        die("Faild to open log file");
+    }
+}
+
+void log_write(log_level level, const char* fmt, ...) {
+    char* level_str;
+
+    if (level == LOG_INFO) level_str = "INFO";
+    if (level == LOG_WARN) level_str = "WARN";
+    if (level == LOG_ERR) level_str = "ERR";
+
+    time_t rawtime;
+    struct tm* timeinfo;
+    char time_str[32];
+
+    time(&rawtime);
+    timeinfo = localtime(&rawtime);
+    strftime(time_str, sizeof(time_str), "%Y-%m-%d %H:%M:%S", timeinfo);
+
+    fprintf(log_file, "[%s] [%s] ", time_str, level_str);
+
+    va_list ap;
+    va_start(ap, fmt);
+    vfprintf(log_file, fmt, ap);
+    va_end(ap);
+
+    fprintf(log_file, "\n");
+    fflush(log_file);
+}
+
+void log_end(FILE* log_file) {
+    if (log_file) {
+        fclose(log_file);
+        log_file = NULL;
+    }
+}
diff --git a/log.h b/log.h
new file mode 100644
index 0000000..e95039f
--- /dev/null
+++ b/log.h
@@ -0,0 +1,16 @@
+#ifndef SS_LOG_H
+#define SS_LOG_H
+
+#define LOG_FILEPATH "./log"
+
+typedef enum {
+    LOG_INFO,
+    LOG_WARN,
+    LOG_ERR,
+} log_level;
+
+void log_init(void);
+
+void log_write(log_level level, const char* fmt, ...);
+
+#endif /* SS_LOG_H */
-- 
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