1 files changed, 102 insertions, 0 deletions
diff --git a/src/Logger/Logger.c b/src/Logger/Logger.c
new file mode 100644
index 0000000..c43b24b
--- /dev/null
+++ b/src/Logger/Logger.c
@@ -0,0 +1,102 @@
+#include "Logger/Logger.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+static LogLevel current_level = LOG_LEVEL_INFO;
+
+static const char *level_name(LogLevel level) {
+  switch (level) {
+  case LOG_LEVEL_ERROR:
+    return "error";
+  case LOG_LEVEL_WARNING:
+    return "warning";
+  case LOG_LEVEL_INFO:
+    return "info";
+  case LOG_LEVEL_DEBUG:
+    return "debug";
+  case LOG_LEVEL_SILENT:
+    return "silent";
+  }
+  return "unknown";
+}
+
+int logger_is_enabled(LogLevel level) {
+  return current_level != LOG_LEVEL_SILENT && level <= current_level;
+}
+
+static void log_message(LogLevel level, const char *format, va_list arguments)
+    YAPSSG_FORMAT_PRINTF(2, 0);
+
+static void log_message(LogLevel level, const char *format, va_list arguments) {
+  if (!logger_is_enabled(level)) {
+    return;
+  }
+
+  fprintf(stderr, "yapssg: %s: ", level_name(level));
+  vfprintf(stderr, format, arguments);
+  fputc('\n', stderr);
+  fflush(stderr);
+}
+
+void logger_set_level(LogLevel level) { current_level = level; }
+
+LogLevel logger_get_level(void) { return current_level; }
+
+int logger_parse_level(const char *name, LogLevel *level) {
+  if (strcmp(name, "error") == 0) {
+    *level = LOG_LEVEL_ERROR;
+  } else if (strcmp(name, "warning") == 0 || strcmp(name, "warn") == 0) {
+    *level = LOG_LEVEL_WARNING;
+  } else if (strcmp(name, "info") == 0) {
+    *level = LOG_LEVEL_INFO;
+  } else if (strcmp(name, "debug") == 0) {
+    *level = LOG_LEVEL_DEBUG;
+  } else if (strcmp(name, "silent") == 0 || strcmp(name, "quiet") == 0) {
+    *level = LOG_LEVEL_SILENT;
+  } else {
+    return -1;
+  }
+  return 0;
+}
+
+void logger_log(LogLevel level, const char *format, ...) {
+  va_list arguments;
+
+  va_start(arguments, format);
+  log_message(level, format, arguments);
+  va_end(arguments);
+}
+
+void logger_error(const char *format, ...) {
+  va_list arguments;
+
+  va_start(arguments, format);
+  log_message(LOG_LEVEL_ERROR, format, arguments);
+  va_end(arguments);
+}
+
+void logger_warning(const char *format, ...) {
+  va_list arguments;
+
+  va_start(arguments, format);
+  log_message(LOG_LEVEL_WARNING, format, arguments);
+  va_end(arguments);
+}
+
+void logger_info(const char *format, ...) {
+  va_list arguments;
+
+  va_start(arguments, format);
+  log_message(LOG_LEVEL_INFO, format, arguments);
+  va_end(arguments);
+}
+
+void logger_debug(const char *format, ...) {
+  va_list arguments;
+
+  va_start(arguments, format);
+  log_message(LOG_LEVEL_DEBUG, format, arguments);
+  va_end(arguments);
+}