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The constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the INIT segment. The latter isn't cleared at any point so the constructors may use it to expose values to the main program. However they must make sure to always write the values as they are not pre-initialized.
136 lines
3.7 KiB
ArmAsm
136 lines
3.7 KiB
ArmAsm
;
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; 2003-03-07, Ullrich von Bassewitz
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; 2011-01-28, Stefan Haubenthal
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; 2014-09-10, Greg King
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;
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; Set up arguments for main
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;
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.constructor initmainargs, 24
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.import __argc, __argv
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.include "atmos.inc"
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.macpack generic
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MAXARGS = 10 ; Maximum number of arguments allowed
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REM = $9D ; BASIC token-code
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;---------------------------------------------------------------------------
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; Get possible command-line arguments. Goes into the special ONCE segment,
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; which may be reused after the startup code is run
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.segment "ONCE"
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.proc initmainargs
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; Assume that the program was loaded, a moment ago, by the traditional LOAD
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; statement. Save the "most-recent filename" as argument #0.
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ldy #FNAME_LEN ; Limit the length
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lda #0 ; The terminating NUL character
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beq L1 ; Branch always
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L0: lda CFOUND_NAME,y
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L1: sta name,y
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dey
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bpl L0
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inc __argc ; argc always is equal to, at least, 1
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; Find the "rem" token.
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ldx #0
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L2: lda BASIC_BUF,x
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beq done ; No "rem", no args.
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inx
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cmp #REM
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bne L2
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; The arguments must be copied to a safe place because BASIC's input buffer
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; might be re-used by the stdin console.
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ldy #(SCREEN_XSIZE * 2 - 1) - 1
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L3: lda BASIC_BUF,y
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sta args,y
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dey
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bpl L3
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ldy #1 * 2 ; Point to second argv slot
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; Find the next argument
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next: lda BASIC_BUF,x
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beq done ; End of line reached
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inx
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cmp #' ' ; Skip leading spaces
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beq next
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; Found start of next argument. We've incremented the pointer in X already, so
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; it points to the second character of the argument. This is useful since we
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; will check now for a quoted argument, in which case we will have to skip this
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; first character.
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found: cmp #'"' ; Is the argument quoted?
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beq setterm ; Jump if so
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dex ; Reset pointer to first argument character
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lda #' ' ; A space ends the argument
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setterm:sta term ; Set end of argument marker
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; Now, store a pointer, to the argument, into the next slot.
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txa ; Get low byte
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add #<args
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sta argv,y ; argv[y]=&arg
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lda #>$0000
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adc #>args
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sta argv+1,y
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iny
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iny
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inc __argc ; Found another arg
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; Search for the end of the argument
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argloop:lda BASIC_BUF,x
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beq done
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inx
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cmp term
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bne argloop
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; We've found the end of the argument. X points one character behind it, and
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; A contains the terminating character. To make the argument a valid C string,
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; replace the terminating character by a zero.
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lda #0
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sta args-1,x
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; Check if the maximum number of command line arguments is reached. If not,
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; parse the next one.
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lda __argc ; Get low byte of argument count
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cmp #MAXARGS ; Maximum number of arguments reached?
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bcc next ; Parse next one if not
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; (The last vector in argv[] already is NULL.)
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done: lda #<argv
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ldx #>argv
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sta __argv
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stx __argv + 1
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rts
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.endproc
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; These arrays are zeroed before initmainargs is called.
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.segment "INIT"
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term: .res 1
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name: .res FNAME_LEN + 1
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args: .res SCREEN_XSIZE * 2 - 1
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.data
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; char* argv[MAXARGS+1]={name};
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argv: .addr name
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.res MAXARGS * 2
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