psxbios: Better realloc implementation

[pcsx_rearmed.git] / libpcsxcore / psxbios.c

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 90c11ae..fc28ff8 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -1010,9 +1010,24 @@ void psxBios_realloc() { // 0x38
 #endif
 
        a0 = block;
-       psxBios_free();
-       a0 = size;
-       psxBios_malloc();
+       /* If "old_buf" is zero, executes malloc(new_size), and returns r2=new_buf (or 0=failed). */
+       if (block == 0)
+       {
+               psxBios_malloc();
+       }
+       /* Else, if "new_size" is zero, executes free(old_buf), and returns r2=garbage. */
+       else if (size == 0)
+       {
+               psxBios_free();
+       }
+       /* Else, executes malloc(new_size), bcopy(old_buf,new_buf,new_size), and free(old_buf), and returns r2=new_buf (or 0=failed). */
+       /* Note that it is not quite implemented this way here. */
+       else
+       {
+               psxBios_free();
+               a0 = size;
+               psxBios_malloc();
+       }
 }