3 ; 2003-03-07, Ullrich von Bassewitz,
4 ; based on code from Stefan A. Haubenthal, <polluks@web.de>
5 ; 2005-02-26, Ullrich von Bassewitz
6 ; 2014-09-10, Greg King
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
27 .import sys_bank, restore_bank
28 .import sysp0:zp, ptr1:zp
35 MAXARGS = 10 ; Maximum number of arguments allowed
36 REM = $8f ; BASIC token-code
37 NAME_LEN = 16 ; maximum length of command-name
39 ; Get possible command-line arguments. Goes into the special INIT segment,
40 ; which may be reused after the startup code is run.
46 ; Assume that the program was loaded, a moment ago, by the traditional LOAD
47 ; statement. Save the "most-recent filename" as argument #0.
48 ; Because the buffer, that we're copying into, was zeroed out,
49 ; we don't need to add a NUL character.
53 lda (sysp0),y ; Get file-name pointer from system bank
64 stx IndReg ; Look for name in correct bank
67 ldy #NAME_LEN - 1 ; limit the length
73 inc __argc ; argc always is equal to at least 1
79 bze done ; no "rem," no args.
85 ; Find the next argument.
88 bze done ; End of line reached
90 cmp #' ' ; Skip leading spaces
93 ; Found start of next argument. We've incremented the pointer in X already, so
94 ; it points to the second character of the argument. That is useful because we
95 ; will check now for a quoted argument; in which case, we will have to skip that
98 found: cmp #'"' ; Is the argument quoted?
99 beq setterm ; Jump if so
100 dex ; Reset pointer to first argument character
101 lda #' ' ; A space ends the argument
102 setterm:sta term ; Set end-of-argument marker
104 ; Now, store a pointer to the argument into the next slot.
108 sta argv,y ; argv[y]= &arg
114 inc __argc ; Found another arg
116 ; Search for the end of the argument.
118 argloop:lda BASIC_BUF,x
124 ; We've found the end of the argument. X points one character behind it, and
125 ; A contains the terminating character. To make the argument a valid C string,
126 ; replace the terminating character by a zero.
131 ; Check if the maximum number of command-line arguments is reached. If not,
132 ; parse the next one.
134 lda __argc ; Get low byte of argument count
135 cmp #MAXARGS ; Maximum number of arguments reached?
136 blt next ; Parse next one if not
138 ; (The last vector in argv[] already is NULL.)
146 ; These arrays are zeroed before initmainargs is called.
148 ; char* argv[MAXARGS+1]={name};
152 name: .res NAME_LEN + 1
156 .res MAXARGS * 2, $00