From db158a77c383d13a22b6a1fe03fb546bbb6434c0 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Fri, 14 Oct 2022 12:05:42 -0700
Subject: Support loading multiple program tapes on top of eachother.

---
 main.cpp | 33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/main.cpp b/main.cpp
index 5788c54..7d299ec 100644
--- a/main.cpp
+++ b/main.cpp
@@ -12,19 +12,7 @@ static const std::unordered_map<std::string, std::uint8_t *> programs = {
     { "count", _binary_count_bin_start }
 };
 
-int main(int argc, const char *argv[]) {
-    if (argc != 2) {
-        std::cerr << "Usage: " << argv[0] << " program\n";
-        std::cerr << "Programs:\n";
-        for (const auto &p : programs)
-            std::cerr << "\t" << p.first << "\n";
-        return 1;
-    }
-
-    auto program = programs.at(argv[1]);
-
-    checker checker;
-
+int load_program(checker &checker, const std::uint8_t *program) {
     bool seen_non_leader = false;
     bool comment = false;
     unsigned int field = 0;
@@ -58,6 +46,25 @@ int main(int argc, const char *argv[]) {
             }
         }
     }
+    return 0;
+}
+
+int main(int argc, const char *argv[]) {
+    if (argc < 2) {
+        std::cerr << "Usage: " << argv[0] << " program [program ...]\n";
+        std::cerr << "Programs:\n";
+        for (const auto &p : programs)
+            std::cerr << "\t" << p.first << "\n";
+        return 1;
+    }
+
+    checker checker;
+
+    for (--argc, ++argv; argc; --argc, ++argv) {
+        auto program = programs.at(argv[0]);
+        if (auto err = load_program(checker, program))
+            return err;
+    }
 
     while (!checker.halted) {
         std::cout << fmt::format("{:04o}: ", checker.pc);
-- 
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