Subversion Repositories Kolibri OS

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;; Copyright (C) KolibriOS team 2011-2015. All rights reserved. ;;

;; Distributed under terms of the GNU General Public License    ;;

;;                                                              ;;

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$Revision: 7121 $

; All parsers are called with ds:si -> value of the variable,

; possibly with spaces before, and dx = limit of config file.

; Three subroutines parse_char, parse_number and parse_bool set CF

; if something has failed, otherwise return the value in al/ax.

parse_timeout:

; timeout is a number not greater than 9

        call    parse_number

        jc      .nothing

        cmp     ax, 9

        jbe     @f

        mov     ax, 9

@@:

        imul    ax, 18

        mov     [es:preboot_timeout], ax

.nothing:

        ret

parse_resolution:

; resolution is *, 'x' can be used instead of '*'

; parse width

        call    parse_number

        jc      .nothing

; save width

        xchg    ax, bx

; test for 'x' or '*'

        call    parse_char

        cmp     al, 'x'

        jz      @f

        cmp     al, '*'

        jnz     .nothing

@@:

; parse height

        call    parse_number

        jc      .nothing

; write width and height

        mov     [es:x_save], bx

        mov     [es:y_save], ax

.nothing:

        ret

parse_vbemode:

; vbemode is a number

        call    parse_number

        jc      .nothing

        mov     [es:number_vm], ax

.nothing:

        ret

parse_biosdisks:

; using biosdisks is a boolean setting

        call    parse_bool

        jc      .nothing

; convert 0 to 2, 1 to 1

        inc     ax

        xor     al, 3

        mov     [es:preboot_biosdisk], al

.nothing:

        ret

parse_imgfrom:

; boot device (1-floppy 2-kolibri.img using primary loader)

        call    parse_number

        jc      .nothing

        cmp     al, 1

        jb      .nothing

        cmp     al, 2

        ja      .nothing

        mov     [es:preboot_device], al

.nothing:

        ret

parse_char:

; skip spaces and return the next character or CF if EOF.

        cmp     si, dx

        jae     .eof

        lodsb

        cmp     al, ' '

        jbe     parse_char

        ret

.eof:

        stc

        ret

parse_number:

; initialize high part of ax to zero

        xor     ax, ax

; skip spaces

        call    parse_char

        jc      .bad

; al should be a digit

        sub     al, '0'

        cmp     al, 9

        ja      .bad

; accumulate the value in cx

        xchg    cx, ax

@@:

        cmp     si, dx

        jae     .eof

        lodsb

        sub     al, '0'

        cmp     al, 9

        ja      .end

        imul    cx, 10

        add     cx, ax

        jmp     @b

; if the end is caused by non-digit, unwind the last character

.end:

        dec     si

.eof:

        xchg    cx, ax

        clc

        ret

.bad:

        stc

        ret

parse_bool:

; skip spaces

        call    parse_char

        jc      .bad

; Boolean false can be represented as 0=no=off,

; boolean true can be represented as 1=yes=on.

        cmp     al, '0'

        jz      .false

        cmp     al, '1'

        jz      .true

        mov     ah, al

        cmp     si, dx

        jae     .bad

        lodsb

        cmp     ax, 'n'*256 + 'o'

        jz      .false

        cmp     ax, 'o'*256 + 'f'

        jz      .false

        cmp     ax, 'y'*256 + 'e'

        jz      .true

        cmp     ax, 'o'*256 + 'n'

        jz      .true

.bad:

        stc

        ret

.true:

        xor     ax, ax

        inc     ax

        ret

.false:

        xor     ax, ax

        ret