1 files changed, 44 insertions, 1 deletions
diff --git a/src/2020/day8/aoc.h b/src/2020/day8/aoc.h
index c5ad3d1..ae2b8ee 100644
--- a/src/2020/day8/aoc.h
+++ b/src/2020/day8/aoc.h
@@ -3,4 +3,47 @@
 
 namespace aoc2020 {
 
-}
+enum code_t {
+  nop,
+  jmp,
+  acc,
+};
+
+struct code {
+  code_t type;
+  int value;
+  int executed = 0;
+
+  void get_number(const char** pp, int* d) {
+    const char* p = *pp;
+    int sign = *p == '+' ? 1 : -1;
+    p += 1;
+    *d = 0;
+    while (*p >= '0' && *p <= '9') {
+      *d = *d * 10 + *p - '0';
+      p++;
+    }
+    *d *= sign;
+    *pp = p;
+  }
+
+  code(line_view lv) {
+    const char* p = lv.line;
+    if (*p == 'a')
+      type = acc;
+    if (*p == 'n')
+      type = nop;
+    if (*p == 'j')
+      type = jmp;
+    while (p < lv.line + lv.length) {
+      if (*p == '+' || *p == '-') {
+        get_number(&p, &value);
+      }
+      p++;
+    }
+  }
+};
+
+int day8(line_view);
+
+} // namespace aoc2020