improve cd change handling

[picodrive.git] / platform / common / emu.c

diff --git a/platform/common/emu.c b/platform/common/emu.c
index cee9f2d..7de2aa9 100644 (file)
--- a/platform/common/emu.c
+++ b/platform/common/emu.c
@@ -80,9 +80,9 @@ static int try_rfn_cut(char *fname)
        return 0;\r
 }\r
 \r
-static void get_ext(char *file, char *ext)\r
+static void get_ext(const char *file, char *ext)\r
 {\r
-       char *p;\r
+       const char *p;\r
 \r
        p = file + strlen(file) - 4;\r
        if (p < file) p = file;\r
@@ -177,12 +177,13 @@ static unsigned char id_header[0x100];
 \r
 /* checks if fname points to valid MegaCD image\r
  * if so, checks for suitable BIOS */\r
-int emu_cd_check(int *pregion, char *fname_in)\r
+static int emu_cd_check(int *pregion, const char *fname_in)\r
 {\r
+       const char *fname = fname_in;\r
        unsigned char buf[32];\r
        pm_file *cd_f;\r
        int region = 4; // 1: Japan, 4: US, 8: Europe\r
-       char ext[5], *fname = fname_in;\r
+       char ext[5];\r
        cue_track_type type = CT_UNKNOWN;\r
        cue_data_t *cue_data = NULL;\r
 \r
@@ -531,6 +532,24 @@ fail:
        return 0;\r
 }\r
 \r
+int emu_swap_cd(const char *fname)\r
+{\r
+       cd_img_type cd_type;\r
+       int ret = -1;\r
+\r
+       cd_type = emu_cd_check(NULL, fname);\r
+       if (cd_type != CIT_NOT_CD)\r
+               ret = Insert_CD(fname, cd_type);\r
+       if (ret != 0) {\r
+               me_update_msg("Load failed, invalid CD image?");\r
+               return 0;\r
+       }\r
+\r
+       strncpy(rom_fname_loaded, fname, sizeof(rom_fname_loaded)-1);\r
+       rom_fname_loaded[sizeof(rom_fname_loaded)-1] = 0;\r
+       return 1;\r
+}\r
+\r
 static void romfname_ext(char *dst, const char *prefix, const char *ext)\r
 {\r
        char *p;\r