1 files changed, 60 insertions, 0 deletions
diff --git a/src/log.c b/src/log.c
new file mode 100644
index 0000000..1c140be
--- /dev/null
+++ b/src/log.c
@@ -0,0 +1,60 @@
+#include "log.h"
+#include <stdio.h>
+#include <stdarg.h>
+#include <time.h>
+#include <string.h>
+
+static FILE *log_file = NULL;
+static LogLevel min_log_level = LOG_INFO;
+
+static const char *level_str(LogLevel level) {
+    switch (level) {
+        case LOG_DEBUG: return "DEBUG";
+        case LOG_INFO:  return "INFO ";
+        case LOG_WARN:  return "WARN ";
+        case LOG_ERROR: return "ERROR";
+        default:        return "?????";
+    }
+}
+
+void log_init(const char *path, LogLevel min_level) {
+    min_log_level = min_level;
+    if (path) {
+        log_file = fopen(path, "a");
+        if (!log_file) {
+            /* Fall back to stderr if we can't open the log file */
+            fprintf(stderr, "umbrella: could not open log file %s, using stderr\n", path);
+            log_file = stderr;
+        }
+    } else {
+        log_file = stderr;
+    }
+}
+
+void log_close(void) {
+    if (log_file && log_file != stderr) {
+        fclose(log_file);
+        log_file = NULL;
+    }
+}
+
+void log_write(LogLevel level, const char *fmt, ...) {
+    if (level < min_log_level) return;
+    if (!log_file) log_file = stderr;
+
+    /* Timestamp */
+    time_t now = time(NULL);
+    struct tm *tm = localtime(&now);
+    char ts[32];
+    strftime(ts, sizeof(ts), "%Y-%m-%d %H:%M:%S", tm);
+
+    fprintf(log_file, "[%s] [%s] ", ts, level_str(level));
+
+    va_list args;
+    va_start(args, fmt);
+    vfprintf(log_file, fmt, args);
+    va_end(args);
+
+    fprintf(log_file, "\n");
+    fflush(log_file);
+}