3 ; Ullrich von Bassewitz, 2003-03-07
4 ; Based on code from Stefan A. Haubenthal, <polluks@web.de>
5 ; 2003-05-18, Greg King
6 ; 2004-04-28, 2005-02-26, Ullrich von Bassewitz
8 ; Scan a group of arguments that are in BASIC's input-buffer.
9 ; Build an array that points to the beginning of each argument.
10 ; Send, to main(), that array and the count of the arguments.
12 ; Command-lines look like these lines:
16 ; run:rem arg1 " arg 2 is quoted " arg3 "" arg5
18 ; "run" and "rem" are entokenned; the args. are not. Leading and trailing
19 ; spaces outside of quotes are ignored.
22 ; - The "file-name" might be a path-name; don't copy the directory-components.
23 ; - Add a control-character quoting mechanism.
25 .constructor initmainargs, 24
26 .import __argc, __argv
31 MAXARGS = 10 ; Maximum number of arguments allowed
32 REM = $8f ; BASIC token-code
33 NAME_LEN = 16 ; Maximum length of command-name
35 ; Get possible command-line arguments. Goes into the special ONCE segment,
36 ; which may be reused after the startup code is run
42 ; Assume that the program was loaded, a moment ago, by the traditional LOAD
43 ; statement. Save the "most-recent filename" as argument #0.
45 lda #0 ; The terminating NUL character
49 ldy #NAME_LEN ; Limit the length
50 bne L1 ; Branch always
55 inc __argc ; argc always is equal to, at least, 1
57 ; Find the "rem" token.
61 beq done ; No "rem," no args.
67 ; Find the next argument
70 beq done ; End of line reached
72 cmp #' ' ; Skip leading spaces
75 ; Found start of next argument. We've incremented the pointer in X already, so
76 ; it points to the second character of the argument. This is useful since we
77 ; will check now for a quoted argument, in which case we will have to skip this
80 found: cmp #'"' ; Is the argument quoted?
81 beq setterm ; Jump if so
82 dex ; Reset pointer to first argument character
83 lda #' ' ; A space ends the argument
84 setterm:sta term ; Set end of argument marker
86 ; Now store a pointer to the argument into the next slot. Since the BASIC
87 ; input buffer is located at the start of a RAM page, no calculations are
91 sta argv,y ; argv[y]= &arg
96 inc __argc ; Found another arg
98 ; Search for the end of the argument
100 argloop:lda BASIC_BUF,x
106 ; We've found the end of the argument. X points one character behind it, and
107 ; A contains the terminating character. To make the argument a valid C string,
108 ; replace the terminating character by a zero.
113 ; Check if the maximum number of command line arguments is reached. If not,
114 ; parse the next one.
116 lda __argc ; Get low byte of argument count
117 cmp #MAXARGS ; Maximum number of arguments reached?
118 bcc next ; Parse next one if not
120 ; (The last vector in argv[] already is NULL.)
131 name: .res NAME_LEN + 1
135 ; char* argv[MAXARGS+1]={name};