Introduce runtime log level switching

1 files changed, 39 insertions, 0 deletions

diff --git a/debug.c b/debug.c
new file mode 100644
index 0000000..eff2654
--- /dev/null
+++ b/debug.c
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: Unlicense */
+
+#include "debug.h"
+
+#include <stdint.h>
+
+int g_log_level = LOG_LEVEL_INFO;
+
+static char ByteToPrintableChar(uint32_t byte)
+{
+    return (byte >= 0x20 && byte <= 0x7f) ? byte : '.';
+}
+
+void FPrintRaw(FILE *s, void const *data_arg, size_t size)
+{
+    const size_t cols = 16;
+    const size_t section_width = 8;
+    if (size == 0) {
+        return;
+    }
+    uint8_t const *data = data_arg;
+    for (size_t line = 0; line < (size - 1) / cols + 1; line++) {
+        fprintf(s, "%08zx: ", line * cols);
+        for (size_t c = 0; c < cols; c++) {
+            fprintf(s, "%02x ", data[line * cols + c]);
+            if (c % section_width == section_width - 1 && c != cols - 1) {
+                fprintf(s, " ");
+            }
+        }
+        fprintf(s, " |");
+        for (size_t c = 0; c < cols; c++) {
+            fprintf(s, "%c", ByteToPrintableChar(data[line * cols + c]));
+            if (c % section_width == section_width - 1 && c != cols - 1) {
+                fprintf(s, " ");
+            }
+        }
+        fprintf(s, "|\n");
+    }
+}