1 files changed, 103 insertions, 0 deletions
diff --git a/nebu/video/console.c b/nebu/video/console.c
new file mode 100644
index 0000000..40f2e12
--- /dev/null
+++ b/nebu/video/console.c
@@ -0,0 +1,103 @@
+#include "video/nebu_console.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+#define CONSOLE_DEPTH 100
+#define CONSOLE_WIDTH 80
+
+static char buffer[CONSOLE_DEPTH][CONSOLE_WIDTH];
+static int position;
+static int offset;
+
+void consoleInit() {
+  int i;
+
+  for(i = 0; i < CONSOLE_DEPTH; i++)
+    buffer[i][0] = '\0';
+
+  position = 0;
+  offset = 0;
+  // fprintf(stderr, "console initialized\n");
+}
+
+void consoleAddLine(char *text) {
+  int i = 0, x=0;
+
+  while(i < CONSOLE_WIDTH - 1 && text[i] != 0) {
+    buffer[position][i] = text[i];
+    i++;
+  }
+  buffer[position][i] = '\0';
+/*  fprintf(stderr, "added \"%s\" to console at buffer[%i] with "
+ *	  " offset of %i\n",
+ *	  buffer[position], position, offset);
+ */
+
+   position++;
+   
+   /* reposition the buffer to avoid overruns - tim */
+   if(position >= 99){
+      for(i=0;i<CONSOLE_DEPTH;i++){
+	 strcpy(buffer[x], buffer[i]);
+	 buffer[i][0] = '\0';
+	 ++x;
+      }
+      position -= 4;
+   }
+}
+
+void consoleDisplay(void(*func)(char *line, int call), int height) {
+  int i;
+  int j = 0;
+  for(i = 0; i < height; i++) {
+    if(*(buffer[ (position + i - height - offset +
+		CONSOLE_DEPTH) % CONSOLE_DEPTH ]) != 0)
+      func(buffer[ (position + i - height - offset +
+		    CONSOLE_DEPTH) % CONSOLE_DEPTH ], j++);
+  }
+}
+  
+void consoleScrollForward(int range) {
+  offset -= range;
+  if(offset < 0) offset = 0;
+}
+
+void consoleScrollBackward(int range) {
+  offset += range;
+  if(offset > CONSOLE_DEPTH - 1)
+    offset = CONSOLE_DEPTH - 1;
+}
+
+/*
+  displayMessage
+
+  post a message to the console and/or stdout/stderr.
+
+  NOTE: Don't put newlines at the end of the format string,
+        the function will handle adding them when appropriate.
+ */
+void displayMessage(outloc_e where, const char *fmt_str, ...) {
+
+  char message[CONSOLE_WIDTH];
+  va_list ap;
+  
+  va_start(ap, fmt_str);
+  
+  if (where & TO_CONSOLE) {
+    vsprintf(message, fmt_str, ap);
+    consoleAddLine(message); 
+  }
+
+  if (where & TO_STDOUT) {
+    vfprintf(stdout, fmt_str, ap);
+    fputc('\n', stdout);
+  }
+
+  if (where & TO_STDERR) {
+    vfprintf(stderr, fmt_str, ap);
+    fputc('\n', stderr);
+  }
+}
+