psxbios: Adds putc and getc implementation

getc will need to be fixed later but this should do as it is.
No issues with putc. Both are similar to psxBios_read and psxBios_write,
except size is 1.

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 775fba7..b13874e 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -316,6 +316,58 @@ static inline void LoadRegs() {
 //                                           *
 //               System calls A0             */
 
+/* Internally redirects to "FileRead(fd,tempbuf,1)".*/
+/* For some strange reason, the returned character is sign-expanded; */
+/* So if a return value of FFFFFFFFh could mean either character FFh, or error. */
+/* TODO FIX ME : Properly implement this behaviour */
+void psxBios_getc(void) // 0x03, 0x35
+{
+       void *pa1 = Ra1;
+#ifdef PSXBIOS_LOG
+       PSXBIOS_LOG("psxBios_%s\n", biosA0n[0x03]);
+#endif
+       v0 = -1;
+
+       if (pa1) {
+               switch (a0) {
+                       case 2: buread(pa1, 1, 1); break;
+                       case 3: buread(pa1, 2, 1); break;
+               }
+       }
+
+       pc0 = ra;
+}
+
+/* Copy of psxBios_write, except size is 1. */
+void psxBios_putc(void) // 0x09, 0x3B
+{
+       void *pa1 = Ra1;
+#ifdef PSXBIOS_LOG
+       PSXBIOS_LOG("psxBios_%s\n", biosA0n[0x09]);
+#endif
+       v0 = -1;
+       if (!pa1) {
+               pc0 = ra;
+               return;
+       }
+
+       if (a0 == 1) { // stdout
+               char *ptr = (char *)pa1;
+
+               v0 = a2;
+               while (a2 > 0) {
+                       printf("%c", *ptr++); a2--;
+               }
+               pc0 = ra; return;
+       }
+
+       switch (a0) {
+               case 2: buwrite(pa1, 1, 1); break;
+               case 3: buwrite(pa1, 2, 1); break;
+       }
+
+       pc0 = ra;
+}
 
 void psxBios_abs() { // 0x0e
        if ((s32)a0 < 0) v0 = -(s32)a0;
@@ -2378,8 +2430,8 @@ void psxBiosInit() {
        //biosA0[0x05] = psxBios_ioctl;
        //biosA0[0x06] = psxBios_exit;
        //biosA0[0x07] = psxBios_sys_a0_07;
-       //biosA0[0x08] = psxBios_getc;
-       //biosA0[0x09] = psxBios_putc;
+       biosA0[0x08] = psxBios_getc;
+       biosA0[0x09] = psxBios_putc;
        //biosA0[0x0a] = psxBios_todigit;
        //biosA0[0x0b] = psxBios_atof;
        //biosA0[0x0c] = psxBios_strtoul;