psxbios : Add checks for strncat

Returns 0 if src or dst is 0x00.

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 924996a..90c11ae 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -493,7 +493,12 @@ void psxBios_strncat() { // 0x16
 #ifdef PSXBIOS_LOG
        PSXBIOS_LOG("psxBios_%s: %s (%x), %s (%x), %d\n", biosA0n[0x16], Ra0, a0, Ra1, a1, a2);
 #endif
-
+       if (a0 == 0 || a1 == 0)
+       {
+               v0 = 0;
+               pc0 = ra;
+               return;
+       }
        while (*p1++);
        --p1;
        while ((*p1++ = *p2++) != '\0') {