psxbios: Add checks for bzero.

Only return 0 if size is invalid. (0 or 0x7FFFFFFF), return dst if not.

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 4019234..c362a75 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -752,7 +752,21 @@ void psxBios_bcopy() { // 0x27
 
 void psxBios_bzero() { // 0x28
        char *p = (char *)Ra0;
+       v0 = a0;
+       /* Same as memset here (See memset below) */
+       if (a1 > 0x7FFFFFFF || a1 == 0)
+       {
+               v0 = 0;
+               pc0 = ra;
+               return;
+       }
+       else if (a0 == 0)
+       {
+               pc0 = ra;
+               return;
+       }
        while ((s32)a1-- > 0) *p++ = '\0';
+       a1 = 0;
        pc0 = ra;
 }