2 ; Christian Groessler, Jan-2003
4 ; int open(const char *name,int flags,...);
13 .destructor closeallfiles, 17
17 .import fddecusage,newfd
19 .import __do_oserror,incsp4
20 .import ldaxysp,addysp
30 dey ; parm count < 4 shouldn't be needed to be checked
31 dey ; (it generates a c compiler warning)
34 beq parmok ; parameter count ok
35 jsr addysp ; fix stack, throw away unused parameters
37 parmok: jsr findfreeiocb
38 beq iocbok ; we found one
40 lda #<EMFILE ; "too many open files"
41 seterr: jsr __seterrno
42 jsr incsp4 ; clean up stack
47 ; process the mode argument
50 jsr clriocb ; init with zero
52 jsr ldaxysp ; get mode
59 cmp #O_RDONLY ; DOS supports append with write-only only
66 .ifndef UCASE_FILENAME
67 invret: lda #<EINVAL ; file name is too long
89 ; process the filename argument
98 invret: lda #<EINVAL ; file name is too long
103 .endif ; defined UCASE_FILENAME
107 ;AX - points to filename
108 ;Y - iocb to use, if open needed
109 jsr newfd ; maybe we don't need to open and can reuse an iocb
110 ; returns fd num to use in tmp2, all regs unchanged
111 bcs doopen ; C set: open needed
112 lda #0 ; clears N flag
131 .ifdef UCASE_FILENAME
133 jsr addysp ; free used space on the stack
134 .endif ; defined UCASE_FILENAME
136 jsr incsp4 ; clean up stack
145 jsr fddecusage ; decrement usage counter of fd as open failed
148 ok: lda tmp2 ; get fd
156 ; closeallfiles: Close all files opened by the program.