From 2bc7dc2837fe5c85f835cb813484765d0091d84c Mon Sep 17 00:00:00 2001
From: cancel <cancel@cancel.fm>
Date: Sun, 25 Nov 2018 03:43:13 +0900
Subject: [PATCH] Add field peek/poke

---
 field.c | 16 ++++++++++++++++
 field.h |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/field.c b/field.c
index 5257b82..47342d5 100644
--- a/field.c
+++ b/field.c
@@ -112,6 +112,22 @@ void field_fill_subrect(Field* f, U32 y, U32 x, U32 height, U32 width,
   }
 }
 
+Term field_peek(Field* f, U32 y, U32 x) {
+  size_t f_height = f->height;
+  size_t f_width = f->width;
+  assert(y < f_height && x < f_width);
+  if (y >= f_height || x >= f_width) return '\0';
+  return f->buffer[y * f_width + x];
+}
+
+void field_poke(Field* f, U32 y, U32 x, Term term) {
+  size_t f_height = f->height;
+  size_t f_width = f->width;
+  assert(y < f_height && x < f_width);
+  if (y >= f_height || x >= f_width) return;
+  f->buffer[y * f_width + x] = term;
+}
+
 void field_debug_draw(Field* f, int offset_y, int offset_x) {
   enum { Line_buffer_count = 4096 };
   chtype line_buffer[Line_buffer_count];
diff --git a/field.h b/field.h
index 07b8c9a..7a7a5dd 100644
--- a/field.h
+++ b/field.h
@@ -15,4 +15,6 @@ void field_copy_subrect(Field* src, Field* dest, U32 src_y, U32 src_x,
                         U32 dest_y, U32 dest_x, U32 height, U32 width);
 void field_fill_subrect(Field* f, U32 y, U32 x, U32 height, U32 width,
                         Term fill_char);
+Term field_peek(Field* f, U32 y, U32 x);
+void field_poke(Field* f, U32 y, U32 x, Term term);
 void field_debug_draw(Field* f, int offset_y, int offset_x);