psxbios: Add todigit implementation

Based on CTRX's code : https://github.com/machinamentum/CTRX/blob/master/bios/source/libc.c#L152

I'm not aware of any games using it but it doesn't hurt to have it
and it should work fine.

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index b13874e..924996a 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -369,6 +369,33 @@ void psxBios_putc(void) // 0x09, 0x3B
        pc0 = ra;
 }
 
+void psxBios_todigit(void) // 0x0a
+{
+       int c = a0;
+#ifdef PSXBIOS_LOG
+       PSXBIOS_LOG("psxBios_%s\n", biosA0n[0x0a]);
+#endif
+       c &= 0xFF;
+       if (c >= 0x30 && c < 0x3A) {
+               c -= 0x30;
+       }
+       else if (c > 0x60 && c < 0x7B) {
+               c -= 0x20;
+       }
+       else if (c > 0x40 && c < 0x5B) {
+               c = c - 0x41 + 10;
+       }
+       else if (c >= 0x80) {
+               c = -1;
+       }
+       else
+       {
+               c = 0x0098967F;
+       }
+       v0 = c;
+       pc0 = ra;
+}
+
 void psxBios_abs() { // 0x0e
        if ((s32)a0 < 0) v0 = -(s32)a0;
        else v0 = a0;
@@ -2432,7 +2459,7 @@ void psxBiosInit() {
        //biosA0[0x07] = psxBios_sys_a0_07;
        biosA0[0x08] = psxBios_getc;
        biosA0[0x09] = psxBios_putc;
-       //biosA0[0x0a] = psxBios_todigit;
+       biosA0[0x0a] = psxBios_todigit;
        //biosA0[0x0b] = psxBios_atof;
        //biosA0[0x0c] = psxBios_strtoul;
        //biosA0[0x0d] = psxBios_strtol;