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#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "blastem.h"
#include "menu.h"
#include "backend.h"
#include "util.h"
uint16_t menu_read_w(uint32_t address, void * context)
{
//This should return the status of the last request with 0
//meaning either the request is complete or no request is pending
//in the current implementation, the operations happen instantly
//in emulated time so we can always return 0
return 0;
}
int menu_dir_sort(const void *a, const void *b)
{
const dir_entry *da, *db;
da = a;
db = b;
if (da->is_dir != db->is_dir) {
return db->is_dir - da->is_dir;
}
return strcasecmp(((dir_entry *)a)->name, ((dir_entry *)b)->name);
}
void copy_string_from_guest(m68k_context *m68k, uint32_t guest_addr, char *buf, size_t maxchars)
{
char *cur;
char *src = NULL;
for (cur = buf; cur < buf+maxchars; cur+=2, guest_addr+=2, src+=2)
{
if (!src || !(guest_addr & 0xFFFF)) {
//we may have walked off the end of a memory block, get a fresh native pointer
src = get_native_pointer(guest_addr, (void **)m68k->mem_pointers, &m68k->options->gen);
if (!src) {
break;
}
}
*cur = src[1];
cur[1] = *src;
if (!*src || !src[1]) {
break;
}
}
//make sure we terminate the string even if we did not hit a null terminator in the source
buf[maxchars-1] = 0;
}
void * menu_write_w(uint32_t address, void * context, uint16_t value)
{
m68k_context *m68k = context;
genesis_context *gen = m68k->system;
menu_context *menu = gen->extra;
if (!menu) {
gen->extra = menu = calloc(1, sizeof(menu_context));
menu->curpath = tern_find_path(config, "ui\0initial_path\0").ptrval;
menu->curpath = menu->curpath ? strdup(menu->curpath) : strdup(get_home_dir());
}
if (menu->state) {
uint32_t dst = menu->latch << 16 | value;
switch (address >> 2)
{
case 0: {
size_t num_entries;
dir_entry *entries = get_dir_list(menu->curpath, &num_entries);
if (entries) {
qsort(entries, num_entries, sizeof(dir_entry), menu_dir_sort);
}
uint8_t *dest;
for (size_t i = 0; i < num_entries; i++)
{
dest = get_native_pointer(dst, (void **)m68k->mem_pointers, &m68k->options->gen);
if (!dest) {
break;
}
*(dest++) = entries[i].is_dir;
*(dest++) = 1;
dst += 2;
uint8_t term = 0;
for (char *cpos = entries[i].name; *cpos; cpos++)
{
dest[1] = *cpos;
dest[0] = cpos[1];
if (cpos[1]) {
cpos++;
} else {
term = 1;
}
dst += 2;
if (!(dst & 0xFFFF)) {
//we may have walked off the end of a memory block, get a fresh native pointer
dest = get_native_pointer(dst, (void **)m68k->mem_pointers, &m68k->options->gen);
if (!dest) {
break;
}
} else {
dest += 2;
}
}
if (!term) {
*(dest++) = 0;
*dest = 0;
dst += 2;
}
}
//terminate list
dest = get_native_pointer(dst, (void **)m68k->mem_pointers, &m68k->options->gen);
if (dest) {
*dest = dest[1] = 0;
free_dir_list(entries, num_entries);
}
break;
}
case 1: {
char buf[4096];
copy_string_from_guest(m68k, dst, buf, sizeof(buf));
if (!strcmp(buf, "..")) {
size_t len = strlen(menu->curpath);
while (len > 1) {
--len;
if (menu->curpath[len] == '/') {
menu->curpath[len] = 0;
break;
}
}
} else {
char *pieces[] = {menu->curpath, "/", buf};
menu->curpath = alloc_concat_m(3, pieces);
free(pieces[0]);
}
break;
}
case 2: {
char buf[4096];
copy_string_from_guest(m68k, dst, buf, sizeof(buf));
char *pieces[] = {menu->curpath, "/", buf};
gen->next_rom = alloc_concat_m(3, pieces);
m68k->should_return = 1;
fprintf(stderr, "MENU: Selected ROM %s\n", buf);
break;
}
default:
fprintf(stderr, "WARNING: write to undefined menu port %X\n", address);
}
menu->state = 0;
} else {
menu->latch = value;
menu->state = 1;
}
return context;
}
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