Adding a DOS port to run on x86 single board computer.

2007-12-06 22:31:14 +00:00
parent af373fbbfe
commit 64e9b54dbd
23 changed files with 2838 additions and 46 deletions
@@ -0,0 +1,61 @@
+/*
+----------------------------------------------------+
+|               Thunderbird Software                 |
+----------------------------------------------------+
+| Filespec  :  Queue.c                               |
+| Date      :  September 29, 1994                    |
+| Time      :  10:16AM                               |
+| Revision  :  1.0                                   |
+----------------------------------------------------+
+| Programmer:  Scott Andrews                         |
+| Address   :  5358 Summit RD SW                     |
+| City/State:  Pataskala, Ohio                       |
+| Zip       :  43062                                 |
+----------------------------------------------------+
+| Released to the Public Domain                      |
+----------------------------------------------------+
+*/
+
+#include <stdlib.h>
+
+#include "queue.h"
+
+QUEUE *alloc_queue( int size)
+{ QUEUE *retval;
+  retval = (QUEUE *) malloc( sizeof( QUEUE) + (size_t) size);
+  if ( (QUEUE *) 0 != retval)
+  {  retval->size = size;
+     retval->head = 0;
+     retval->tail = 0;
+     retval->avail = size;
+     retval->buffer = ( (char *) retval) + sizeof( QUEUE);
+  }
+  return retval;
+}
+
+int en_queue( QUEUE *queue, char data)
+{ int retval = -1;
+  if ( 0 != queue->avail)
+  {  *( queue->buffer + queue->head) = data;
+     queue->head += 1;
+     if ( queue->head == queue->size)
+        queue->head = 0;
+     queue->avail -= 1;
+     retval = queue->avail;
+  }
+  return retval;
+}
+
+int de_queue( QUEUE *queue)
+{ int retval = -1;
+  if ( queue->avail != queue->size)
+  {  retval = *( queue->buffer + queue->tail);
+     queue->tail += 1;
+     if ( queue->tail == queue->size)
+        queue->tail = 0;
+     queue->avail += 1;
+  }
+  return retval;
+}
+
+/* End of Queue.c */