fix invoice savefile overflow

1 files changed, 27 insertions, 0 deletions

diff --git a/src/log.cpp b/src/log.cpp
new file mode 100644
index 0000000..960ee85
--- /dev/null
+++ b/src/log.cpp
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "log.hpp"
+
+log g_log = {0};
+
+void log_add(double timestamp, const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    vsnprintf(g_log.history[g_log.write_cursor], MAX_LEN_LOG_TXT, fmt, args);
+    va_end(args);
+
+    char tmp[MAX_LEN_LOG_TXT];
+    snprintf(tmp, MAX_LEN_LOG_TXT, "[%.3f] %s", timestamp, g_log.history[g_log.write_cursor]);
+    tmp[MAX_LEN_LOG_TXT-1] = 0;
+    memcpy(g_log.history[g_log.write_cursor], tmp, MAX_LEN_LOG_TXT);
+
+    printf(g_log.history[g_log.write_cursor]);
+
+    g_log.write_cursor++;
+    if (g_log.write_cursor >= MAX_LEN_LOG_HISTORY) g_log.write_cursor = 0;
+
+    g_log.history_length++;
+    if (g_log.history_length > MAX_LEN_LOG_HISTORY) g_log.history_length = MAX_LEN_LOG_HISTORY;
+}