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Rev Author Line No. Line
2288 clevermous 1
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;                                                              ;;
5363 yogev_ezra 3
;; Copyright (C) KolibriOS team 2011-2015. All rights reserved. ;;
2288 clevermous 4
;; Distributed under terms of the GNU General Public License    ;;
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;;                                                              ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 8092 $
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; All parsers are called with ds:si -> value of the variable,
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; possibly with spaces before, and dx = limit of config file.
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; Three subroutines parse_char, parse_number and parse_bool set CF
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; if something has failed, otherwise return the value in al/ax.
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parse_timeout:
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; timeout is a number not greater than 9
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        call    parse_number
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        jc      .nothing
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        cmp     ax, 9
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        jbe     @f
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        mov     ax, 9
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@@:
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        imul    ax, 18
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        mov     [es:preboot_timeout], ax
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.nothing:
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        ret
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parse_resolution:
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; resolution is *, 'x' can be used instead of '*'
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; parse width
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        call    parse_number
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        jc      .nothing
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; save width
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        xchg    ax, bx
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; test for 'x' or '*'
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        call    parse_char
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        cmp     al, 'x'
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        jz      @f
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        cmp     al, '*'
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        jnz     .nothing
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@@:
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; parse height
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        call    parse_number
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        jc      .nothing
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; write width and height
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        mov     [es:x_save], bx
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        mov     [es:y_save], ax
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.nothing:
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        ret
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parse_vbemode:
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; vbemode is a number
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        call    parse_number
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        jc      .nothing
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        mov     [es:number_vm], ax
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.nothing:
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        ret
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parse_biosdisks:
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; using biosdisks is a boolean setting
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        call    parse_bool
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        jc      .nothing
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; convert 0 to 2, 1 to 1
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        inc     ax
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        xor     al, 3
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        mov     [es:preboot_biosdisk], al
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.nothing:
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        ret
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parse_imgfrom:
8092 dunkaist 72
; boot device (1-floppy 2-kolibri.img using primary loader, 3-don't use ramdisk)
2288 clevermous 73
        call    parse_number
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        jc      .nothing
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        cmp     al, 1
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        jb      .nothing
8091 dunkaist 77
        cmp     al, 3
2288 clevermous 78
        ja      .nothing
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        mov     [es:preboot_device], al
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.nothing:
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        ret
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8091 dunkaist 83
parse_syspath:
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; everything except spaces
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        mov     bx, preboot_syspath
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.next_char:
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        call    parse_char
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        jc      .done
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        mov     [es:bx], al
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        inc     bx
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        jmp     .next_char
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.done:
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        mov     byte[es:bx], 0          ; terminator
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        ret
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2288 clevermous 96
parse_char:
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; skip spaces and return the next character or CF if EOF.
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        cmp     si, dx
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        jae     .eof
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        lodsb
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        cmp     al, ' '
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        jbe     parse_char
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        ret
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.eof:
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        stc
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        ret
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parse_number:
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; initialize high part of ax to zero
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        xor     ax, ax
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; skip spaces
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        call    parse_char
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        jc      .bad
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; al should be a digit
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        sub     al, '0'
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        cmp     al, 9
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        ja      .bad
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; accumulate the value in cx
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        xchg    cx, ax
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@@:
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        cmp     si, dx
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        jae     .eof
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        lodsb
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        sub     al, '0'
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        cmp     al, 9
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        ja      .end
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        imul    cx, 10
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        add     cx, ax
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        jmp     @b
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; if the end is caused by non-digit, unwind the last character
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.end:
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        dec     si
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.eof:
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        xchg    cx, ax
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        clc
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        ret
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.bad:
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        stc
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        ret
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parse_bool:
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; skip spaces
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        call    parse_char
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        jc      .bad
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; Boolean false can be represented as 0=no=off,
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; boolean true can be represented as 1=yes=on.
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        cmp     al, '0'
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        jz      .false
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        cmp     al, '1'
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        jz      .true
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        mov     ah, al
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        cmp     si, dx
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        jae     .bad
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        lodsb
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        cmp     ax, 'n'*256 + 'o'
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        jz      .false
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        cmp     ax, 'o'*256 + 'f'
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        jz      .false
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        cmp     ax, 'y'*256 + 'e'
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        jz      .true
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        cmp     ax, 'o'*256 + 'n'
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        jz      .true
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.bad:
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        stc
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        ret
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.true:
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        xor     ax, ax
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        inc     ax
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        ret
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.false:
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        xor     ax, ax
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        ret