add log message buffer

The log message buffer is used to display in
the ncurses log window even those messages
logged before ncurses has started.

code/bngblaster/src/bbl.c

@@ -23,7 +23,11 @@
 bbl_ctx_s *g_ctx = NULL;
 
 /* Global Variables */
-bool g_interactive = false; /* interactive mode using ncurses */
+bool    g_interactive = false; /* interactive mode using ncurses */
+
+uint8_t g_log_buf_cur = 0;
+char   *g_log_buf = NULL;
+
 bool g_init_phase = true;
 bool g_traffic = true;
 bool g_banner = true;
@@ -444,6 +448,7 @@ main(int argc, char *argv[])
                 break;
             case 'I':
                 interactive = true;
+                bbl_interactive_log_buf_init();
                 break;
             case 'S':
                 g_ctx->ctrl_socket_path = optarg;

code/bngblaster/src/bbl_interactive.c

@@ -57,6 +57,51 @@ uint32_t g_session_selected   = 1;
 
 extern const char banner[];
 
+/*
+ * The log message buffer is used to display in the ncurses log window
+ * even those messages logged  before ncurses has started.
+ */
+
+extern char *g_log_buf;
+extern uint8_t g_log_buf_cur;
+
+void
+bbl_interactive_log_buf_init()
+{
+    if(g_log_buf) {
+        free(g_log_buf);
+    }
+    g_log_buf = calloc(LOG_BUF_LINES, LOG_BUF_STR_LEN);
+    g_log_buf_cur = 0;
+}
+
+static void
+bbl_interactive_log_buf_free()
+{
+    int i = 0;
+    char *line = NULL;
+    if(!g_log_buf) {
+        return;
+    }
+    for(i = g_log_buf_cur; i < LOG_BUF_LINES; i++) {
+        line = g_log_buf+(i*LOG_BUF_STR_LEN);
+        if(!strnlen(line, LOG_BUF_STR_LEN)) {
+            break;
+        }
+        wprintw(log_win, "%s", line);
+    }
+    for(i = 0; i < g_log_buf_cur; i++) {
+        line = g_log_buf+(i*LOG_BUF_STR_LEN);
+        if(!strnlen(line, LOG_BUF_STR_LEN)) {
+            break;
+        }
+        wprintw(log_win, "%s", line);
+    }
+    wrefresh(log_win);
+    free(g_log_buf);
+    g_log_buf = NULL;
+}
+
 /*
  * Format a progress bar.
  */
@@ -680,6 +725,7 @@ bbl_interactive_init()
     bbl_interactive_init_window();
     wrefresh(stats_win);
 
+    bbl_interactive_log_buf_free();
     g_interactive = true;
 }
 

code/bngblaster/src/bbl_interactive.h

@@ -11,6 +11,9 @@
 #ifndef __BBL_INTERACTIVE_H__
 #define __BBL_INTERACTIVE_H__
 
+void
+bbl_interactive_log_buf_init();
+
 void
 bbl_interactive_init();