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Rev 364 Rev 365
Line 102... Line 102...
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  const struct CMD_ID *cmdptr;
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  const struct CMD_ID *cmdptr;
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  struct cmd_funcparam p;
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  struct cmd_funcparam p;
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  unsigned short argoffset;
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  unsigned short argoffset;
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  char cmdbuff[256];
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  char cmdbuff[256];
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  /* special case: is this a drive change? (like "E:") */
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  if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') || (cmdline[2] == 0))) {
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    if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) || ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {
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      unsigned char drive = cmdline[0];
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      unsigned char curdrive = 0;
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      if (drive >= 'a') {
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        drive -= 'a';
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      } else {
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        drive -= 'A';
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      }
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      _asm {
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        push ax
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        push dx
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        mov ah, 0x0e     /* DOS 1+ - SELECT DEFAULT DRIVE */
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        mov dl, drive    /* DL = new default drive (00h = A:, 01h = B:, etc) */
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        int 0x21
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        mov ah, 0x19     /* DOS 1+ - GET CURRENT DRIVE */
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        int 0x21
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        mov curdrive, al /* cur drive (0=A, 1=B, etc) */
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        pop dx
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        pop ax
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      }
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      if (curdrive != drive) puts(doserr(0x0f));
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      return(-1);
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    }
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  }
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  /* try matching an internal command */
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  cmdptr = cmd_match(cmdline, &argoffset);
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  cmdptr = cmd_match(cmdline, &argoffset);
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  if (cmdptr == NULL) return(-2); /* command is not recognized as internal */
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  if (cmdptr == NULL) return(-2); /* command is not recognized as internal */
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  /* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */
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  /* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */
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