Code Golf Part 2 - Basic

src/Makefile

@@ -85,6 +85,11 @@ CODEGOLF_TEST_SOURCES=$(CPU_SOURCES) codegolf_test.c
 CODEGOLF_TEST_OBJECTS=$(CODEGOLF_TEST_SOURCES:.c=.o)
 CODEGOLD_TEST_LIBS=$(LUA_LIBS)
 
+CODEGOLF_BASIC=codegolf_basic
+CODEGOLF_BASIC_SOURCES=$(CPU_SOURCES) codegolf_basic.c
+CODEGOLF_BASIC_OBJECTS=$(CODEGOLF_BASIC_SOURCES:.c=.o)
+CODEGOLD_BASIC_LIBS=$(LUA_LIBS)
+
 
 all: $(EWM_SOURCES) $(EWM_EXECUTABLE) $(CPU_TEST_SOURCES) $(CPU_TEST_EXECUTABLE) $(SCR_TEST_EXECUTABLE) $(TTY_TEST_EXECUTABLE) $(CPU_BENCH) $(MEM_BENCH)
 
@@ -112,5 +117,8 @@ $(MEM_BENCH): $(MEM_BENCH_OBJECTS)
 $(CODEGOLF_TEST): $(CODEGOLF_TEST_OBJECTS)
 	$(CC) $(LDFLAGS) $(CODEGOLF_TEST_OBJECTS) $(CODEGOLF_TEST_LIBS) -o $@
 
+$(CODEGOLF_BASIC): $(CODEGOLF_BASIC_OBJECTS)
+	$(CC) $(LDFLAGS) $(CODEGOLF_BASIC_OBJECTS) $(CODEGOLF_BASIC_LIBS) -o $@
+
 .c.o:
 	$(CC) $(CFLAGS) $< -c -o $@

src/codegolf_basic.c

@@ -0,0 +1,71 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2020 Stefan Arentz - http://github.com/st3fan/ewm
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include <stdint.h>
+#include <stdio.h>
+
+#include "fmt.h"
+#include "cpu.h"
+#include "mem.h"
+
+//
+// This implements the "Doing something more interactive with it" part of the code golf at
+// https://codegolf.stackexchange.com/questions/12844/emulate-a-mos-6502-cpu
+//
+
+uint8_t input_handler(struct cpu_t *cpu, struct mem_t *mem, uint16_t addr) {
+  return 0;
+}
+
+void output_handler(struct cpu_t *cpu, struct mem_t *mem, uint16_t addr, uint8_t b) {
+  printf("Hello\n");
+  if (addr == 0xf001) {
+    printf("Got: %c\n", b);
+  }
+}
+
+int main() {
+  struct cpu_t *cpu = cpu_create(EWM_CPU_MODEL_6502);
+  cpu_add_ram(cpu, 0x0000, 0xbfff);
+  cpu_add_ram_file(cpu, 0xc000, "rom/ehbasic.bin");
+  cpu_add_iom(cpu, 0xf000, 0xf0ff, NULL, input_handler, output_handler);
+  cpu_reset(cpu);
+  cpu->state.pc = 0xc000;
+  
+  while (true) {
+    char state[1024];
+    cpu_format_state(cpu, state);
+
+    char ins[1024];
+    cpu_format_instruction(cpu, ins);
+    
+    printf("%.4X: %s %s\n", cpu->state.pc, state, ins);
+    
+    int ret = cpu_step(cpu);
+    if (ret < 0) {
+      fprintf(stderr, "Unexpected error %d\n", ret);
+      return 1;
+    }
+  }
+  
+  return 0;
+}