Config, CTRL+C, exit

src/main.c

@@ -23,8 +23,10 @@ void set_nonblocking_input(void) {
   atexit(restore_terminal);
 
   raw = orig_termios;
-  raw.c_lflag &= ~(ICANON | ECHO); // disable line buffering and echo
-  raw.c_cc[VMIN] = 0;              // don't block waiting for input
+  raw.c_lflag &= ~(ICANON | ECHO); // disable line buffering, echo
+  /* Ctrl+C becomes ordinary input byte 0x03 */
+  raw.c_cc[VINTR] = _POSIX_VDISABLE;
+  raw.c_cc[VMIN] = 0; // don't block waiting for input
   raw.c_cc[VTIME] = 0;
   tcsetattr(STDIN_FILENO, TCSANOW, &raw);
 
@@ -34,6 +36,9 @@ void set_nonblocking_input(void) {
 }
 
 int main(void) {
+  printf("6502PC Emulator with MS Basic\n");
+  printf("CTRL + G to exit\n");
+
   uint8_t *ram = NULL;
   CPU cpu;
 
@@ -43,26 +48,26 @@ int main(void) {
 
   if (createRAM(&ram) != 0) {
     printf("Could not create RAM\n");
-    return 1;
+    exit(EXIT_FAILURE);
   }
 
   /* DEBUG */
 
-  //FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
-  //FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
-  //FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
-  //FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
+  // FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
+  // FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
+  // FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
+  // FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
   /*
   if (!fp) {
     perror("fopen");
-    return 1;
+    exit(EXIT_FAILURE);
   }
 
   fread(ram, 1, RAM_SIZE, fp);
   if (ferror(fp)) {
     perror("fread");
     fclose(fp);
-    return 1;
+    exit(EXIT_FAILURE);
   }
 
   fclose(fp);
@@ -76,8 +81,10 @@ int main(void) {
   while (1) {
     uint8_t sleep = runCycle(&cpu, ram, rom);
     if (sleep == 1) {
-      printf("opcode missing: 0x%X\n", ram[cpu.ProgrammeCounter - 1]);
-      return 1;
+      printf("Illegal opcode $%02X at $%04X "
+             "A=$%02X X=$%02X Y=$%02X SP=$%02X\n",
+             ram[cpu.ProgrammeCounter - 1], cpu.ProgrammeCounter - 1, cpu.Accumulator, cpu.X, cpu.Y, cpu.StackPointer);
+      exit(EXIT_FAILURE);
     }
     sleepTime.tv_sec = 0;
     sleepTime.tv_nsec = sleep * (1000 / MACHINE_SPEED_HZ);