From b769f987e089c4b5312b607f973bfe20e3c14ade Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Wed, 20 Nov 2019 19:56:44 -0800
Subject: buffers: support list operations.

* lib.c (car, cdr, rplaca, rplacd, make_like): Handle
BUF type.
---
 lib.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/lib.c b/lib.c
index 5cd5be4f..597c7edc 100644
--- a/lib.c
+++ b/lib.c
@@ -539,6 +539,10 @@ val car(val cons)
     if (zerop(length_str(cons)))
       return nil;
     return chr_str(cons, zero);
+  case BUF:
+    if (zerop(length_buf(cons)))
+      return nil;
+    return buf_get_uchar(cons, zero);
   case COBJ:
     if (obj_struct_p(cons)) {
       {
@@ -581,6 +585,10 @@ val cdr(val cons)
     if (le(length(cons), one))
       return nil;
     return sub(cons, one, t);
+  case BUF:
+    if (le(length_buf(cons), one))
+      return nil;
+    return sub_buf(cons, one, nil);
   case COBJ:
     if (obj_struct_p(cons)) {
       {
@@ -613,6 +621,9 @@ val rplaca(val cons, val new_car)
   case LSTR:
     refset(cons, zero, new_car);
     return cons;
+  case BUF:
+    buf_put_uchar(cons, zero, new_car);
+    return cons;
   default:
     if (structp(cons)) {
       {
@@ -648,6 +659,7 @@ val rplacd(val cons, val new_cdr)
   case VEC:
   case STR:
   case LSTR:
+  case BUF:
     replace(cons, new_cdr, one, t);
     return cons;
   default:
@@ -978,6 +990,12 @@ val make_like(val list, val thatobj)
       if (is_chr(car(list)))
         return cat_str(list, nil);
       break;
+    case BUF:
+      if (!list)
+        return make_buf(zero, zero, zero);
+      if (integerp(car(list)))
+        return buf_list(list);
+      break;
     case COBJ:
       if (obj_struct_p(thatobj)) {
         val from_list_meth = get_special_slot(thatobj, from_list_m);
-- 
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