cleanup, simplified event callbacks, step now consumes branch-skipped instructions

[dcpu16] / vm-dcpu16.c

diff --git a/vm-dcpu16.c b/vm-dcpu16.c
index 17effb6a558db14d11698cfceaf56d452c202252..df86455070e7c91b008456579eeb2360b0425959 100644 (file)
--- a/vm-dcpu16.c
+++ b/vm-dcpu16.c
@@ -43,7 +43,8 @@ void sigint_handler_(int sig) {
 
 #define VERBOSE_PRINTF(...) do { if (opt_.verbose) printf(__VA_ARGS__); } while (0)
 
-static void usage_(char *prog, unsigned int full) {
+static
+void usage_(char *prog, unsigned int full) {
     FILE *f = full ? stdout : stderr;
     char *x = strrchr(prog, '/');
 
@@ -130,13 +131,17 @@ int buf_tok_vect_(char ***v, int *c, char *buf) {
     return 0;
 }
 
-/* resets the instance and loads an image into ram starting at addr */
+/*
+    resets the vm if addr is zero then
+    loads an image from filename into ram starting at addr
+*/
 static
 int file_load_(struct dcpu16 *vm, char *filename, DCPU16_WORD addr) {
     FILE *f;
     size_t r;
 
-    dcpu16_reset(vm);
+    if (!addr)
+        dcpu16_reset(vm);
 
     f = fopen(filename, "rb");
     if (f == NULL) {
@@ -196,6 +201,21 @@ COMMAND_HELP(quit) {
 }
 
 
+COMMAND_IMPL(reset) {
+    (void)arg_count, (void)arg_vector;
+
+    dcpu16_reset(vm);
+    printf("initialized\n");
+    return 0;
+}
+COMMAND_HELP(reset) {
+    fprintf(f, "\treset\n");
+    if (summary) return;
+
+    fprintf(f, "Clears and reinitializes emulator.\n");
+}
+
+
 COMMAND_IMPL(load) {
     int addr = 0;
 
@@ -379,6 +399,7 @@ static struct command_ command_table_[] = {
     COMMAND_ENTRY(disassemble, 0, 2),
     COMMAND_ENTRY(step, 0, 1),
     COMMAND_ENTRY(run, 0, 0),
+    COMMAND_ENTRY(reset, 0, 0),
     { NULL, 0, 0, NULL, NULL }
 };