Add debug log buffering, fix GetHeapUsage()

1 files changed, 50 insertions, 0 deletions

diff --git a/libpsn00b/psxetc/logging.c b/libpsn00b/psxetc/logging.c
new file mode 100644
index 0000000..5199190
--- /dev/null
+++ b/libpsn00b/psxetc/logging.c
@@ -0,0 +1,50 @@
+/*
+ * PSn00bSDK internal debug logger
+ * (C) 2022 spicyjpeg - MPL licensed
+ *
+ * This file provides the (admittedly minimal) logging system used by all
+ * PSn00bSDK libraries. Log messages and warnings are issued using the
+ * _sdk_log() macro and collected into a buffer, whose contents can be flushed
+ * by calling _sdk_dump_log() (by default this is done by VSync()). Logging is
+ * only enabled in debug builds of libpsn00b.
+ */
+
+#include <stddef.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <psxapi.h>
+#include <psxetc.h>
+
+#define LOG_BUFFER_SIZE		256
+
+#ifndef NDEBUG
+
+/* Internal globals */
+
+static char   _log_buffer[LOG_BUFFER_SIZE];
+static size_t _log_buffer_length = 0;
+
+/* Internal logging API */
+
+void _sdk_log_inner(const char *fmt, ...) {
+	va_list ap;
+
+	va_start(ap, fmt);
+	_log_buffer_length += vsnprintf(
+		&_log_buffer[_log_buffer_length],
+		LOG_BUFFER_SIZE - _log_buffer_length,
+		fmt,
+		ap
+	);
+	va_end(ap);
+}
+
+void _sdk_dump_log_inner(void) {
+	if (!_log_buffer_length)
+		return;
+
+	write(1, _log_buffer, _log_buffer_length);
+	_log_buffer_length = 0;
+}
+
+#endif