3 ; Ullrich von Bassewitz, 2003-03-07
4 ; Based on code from Stefan A. Haubenthal <polluks@web.de>, 2003-11-08
5 ; Greg King, 2003-05-18
6 ; Stefan Haubenthal, 2005-01-07
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 ; call2048:rem arg1 " arg 2 is quoted " arg3 "" arg5
18 ; "call" 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
30 ; Maximum number of arguments allowed in the argument table.
31 ; (An argument contains a comma, at least.)
38 MAXARGS = 10 ; Maximum number of arguments allowed
39 REM = $B2 ; BASIC token-code
40 NAME_LEN = 15 ; maximum length of command-name
43 .if MAXARGS > (BASIC_BUF_LEN - 2)/2
44 .error "Too many arguments"
47 ; Get possible command-line arguments. Goes into the special INIT segment,
48 ; which may be reused after the startup code is run
54 ; Assume that the program was loaded, a moment ago, by the traditional LOAD
55 ; statement. Save the "most-recent filename" as argument #0.
56 ; Because the buffer, that we're copying into, was zeroed out,
57 ; we don't need to add a NUL character.
62 ldy #NAME_LEN - 1 ; limit the length
67 inc __argc ; argc always is equal to, at least, 1
69 ; Find the "rem" token.
73 beq done ; no "rem" no args.
79 ; Find the next argument.
84 cmp #' ' ; Skip leading spaces
87 ; Found start of next argument. We've incremented the pointer in X already, so
88 ; it points to the second character of the argument. This is useful since we
89 ; will check now for a quoted argument, in which case we will have to skip this
92 found: cmp #'"' ; Is the argument quoted?
93 beq setterm ; Jump if so
94 dex ; Reset pointer to first argument character
95 lda #' ' ; A space ends the argument
96 setterm:sta term ; Set end of argument marker
98 ; Now store a pointer to the argument into the next slot. Since the BASIC
99 ; input buffer is located at the start of a RAM page, no calculations are
103 sta argv,y ; argv[y]= &arg
108 inc __argc ; Found another arg
110 ; Search for the end of the argument
112 argloop:lda BASIC_BUF,x
118 ; We've found the end of the argument. X points one character behind it, and
119 ; A contains the terminating character. To make the argument a valid C string,
120 ; replace the terminating character by a zero.
125 ; Check if the maximum number of command line arguments is reached. If not,
126 ; parse the next one.
128 lda __argc ; Get low byte of argument count
129 cmp #MAXARGS ; Maximum number of arguments reached?
130 bcc next ; Parse next one if not
132 ; (The last vector in argv[] already is NULL.)
140 ; These arrays are zeroed before initmainargs is called.
141 ; char name[NAME_LEN+1];
142 ; char* argv[MAXARGS+1]={name};
146 name: .res NAME_LEN + 1