toybox-0.5.0-tail-n-c.patch

--- old/toybox-0.5.0/toys/posix/tail.c	2014-10-02 14:47:08.000000000 +0200
+++ new/toybox-0.5.0/toys/posix/tail.c	2014-10-23 22:16:08.555395883 +0200
@@ -41,6 +41,7 @@
   struct line_list *next, *prev;
   char *data;
   int len;
+  int orig_len;
 };
 
 static struct line_list *get_chunk(int fd, int len)
@@ -49,7 +50,7 @@
 
   memset(line, 0, sizeof(struct line_list));
   line->data = ((char *)line) + sizeof(struct line_list);
-  line->len = readall(fd, line->data, len);
+  line->len = line->orig_len = readall(fd, line->data, len);
 
   if (line->len < 1) {
     free(line);
@@ -156,10 +157,10 @@
 
       // If tracing bytes, add until we have enough, discarding overflow.
       if (TT.bytes) {
-        bytes += new->len;
+      	bytes += new->len;
         if (bytes > 0) {
-          while (list->len <= bytes) {
-            bytes -= list->len;
+          while(list->orig_len <= bytes) {
+            bytes -= list->orig_len;
             free(dlist_pop(&list));
           }
           list->data += bytes;
@@ -176,9 +177,14 @@
           linepop = try[count] == '\n';
 
           if (lines > 0) {
+            char c;
             do {
-              if (!--(list->len)) free(dlist_pop(&list));
-            } while (*(list->data++) != '\n');
+              c = *(list->data);
+              if (!--(list->len))
+              	free(dlist_pop(&list));
+              else
+              	list->data++;
+            } while (c != '\n');
             lines--;
           }
         }