Apple2: implement stat(2) and statvfs(3)

libsrc/apple2/mktime_dt.s

@@ -0,0 +1,37 @@
+;
+; Oliver Schmidt, 14.08.2018
+; Colin Leroy-Mira, 2023 <colin@colino.net>
+;
+; time_t __fastcall__ mktime_dt(const struct datetime *dt)
+;
+
+        .import         steaxspidx, pushax, incsp2, _gmtime_dt
+        .import         tm_buf
+        .export         _mktime_dt
+
+        .include        "time.inc"
+        .include        "zeropage.inc"
+        .include        "errno.inc"
+        .include        "mli.inc"
+
+        ; Convert ProDOS date/time to UNIX timestamp
+        ; source date address in AX
+
+_mktime_dt:
+        ; Convert to internal tm
+        jsr     _gmtime_dt
+        cpx     #$00
+        bne     :+
+        cmp     #$00
+        beq     err
+
+        ; Make time_t
+:       lda     #<tm_buf
+        ldx     #>tm_buf
+        jmp     _mktime
+
+err:    lda     #$00
+        tax
+        sta     sreg
+        sta     sreg+1
+        rts