libretro: search for BIOS harder

diff --git a/frontend/libretro.c b/frontend/libretro.c
index ec034c2..103ee8e 100644 (file)
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 
 #include "../libpcsxcore/misc.h"
 #include "../libpcsxcore/psxcounters.h"
@@ -861,13 +862,67 @@ void retro_run(void)
        vout_fb_dirty = 0;
 }
 
+static bool try_use_bios(const char *path)
+{
+       FILE *f;
+       long size;
+       const char *name;
+
+       f = fopen(path, "rb");
+       if (f == NULL)
+               return false;
+
+       fseek(f, 0, SEEK_END);
+       size = ftell(f);
+       fclose(f);
+
+       if (size != 512 * 1024)
+               return false;
+
+       name = strrchr(path, SLASH);
+       if (name++ == NULL)
+               name = path;
+       snprintf(Config.Bios, sizeof(Config.Bios), "%s", name);
+       return true;
+}
+
+#if 1
+#include <sys/types.h>
+#include <dirent.h>
+
+static bool find_any_bios(const char *dirpath, char *path, size_t path_size)
+{
+       DIR *dir;
+       struct dirent *ent;
+       bool ret = false;
+
+       dir = opendir(dirpath);
+       if (dir == NULL)
+               return false;
+
+       while ((ent = readdir(dir))) {
+               if (strncasecmp(ent->d_name, "scph", 4) != 0)
+                       continue;
+
+               snprintf(path, path_size, "%s/%s", dirpath, ent->d_name);
+               ret = try_use_bios(path);
+               if (ret)
+                       break;
+       }
+       closedir(dir);
+       return ret;
+}
+#else
+#define find_any_bios(...) false
+#endif
+
 void retro_init(void)
 {
        const char *bios[] = { "scph1001", "scph5501", "scph7001" };
        const char *dir;
        char path[256];
-       FILE *f = NULL;
        int i, ret, level;
+       bool found_bios = false;
 
        ret = emu_core_preinit();
        ret |= emu_core_init();
@@ -884,27 +939,27 @@ void retro_init(void)
 
                for (i = 0; i < sizeof(bios) / sizeof(bios[0]); i++) {
                        snprintf(path, sizeof(path), "%s/%s.bin", dir, bios[i]);
-                       f = fopen(path, "r");
-                       if (f != NULL) {
-                               snprintf(Config.Bios, sizeof(Config.Bios), "%s.bin", bios[i]);
+                       found_bios = try_use_bios(path);
+                       if (found_bios)
                                break;
-                       }
                }
+
+               if (!found_bios)
+                       found_bios = find_any_bios(dir, path, sizeof(path));
        }
-       if (f != NULL) {
+       if (found_bios) {
                SysPrintf("found BIOS file: %s\n", Config.Bios);
-               fclose(f);
        }
        else
-   {
+       {
                SysPrintf("no BIOS files found.\n");
-      struct retro_message msg = 
-      {
-         "no BIOS found, expect bugs!",
-         180
-      };
-      environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE, (void*)&msg);
-   }
+               struct retro_message msg = 
+               {
+                       "no BIOS found, expect bugs!",
+                       180
+               };
+               environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE, (void*)&msg);
+       }
 
        level = 1;
        environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);