struc

[Hjort Nidudsson]

Using struct member as argument to invoke (16bit) seems to fail, like:

    invoke strcpy, addr config.cf_path, string

Test code: (struc.asm):

The segment part of the argument is (in some cases) adding offset.
.model small
.stack 128
.data
foo struc
c_b1    db ?
c_b2    db ?
foo ends
bar foo <?>
.code
start:  mov ax,seg bar.c_b2
    sub ax,seg _DATA
    mov ah,4Ch
    int 21h
end start

This works: (return 0)

jwasm -mz struc.asm

This fails: (return 1)

jwasm struc.asm
wlink F struc.obj SYS DOS

[Steve A]

Untested on 16bit, but, this seems to work on 32bit:

foo struct
c_b1 db    20 dup(0)  ; or whatever string length
c_b2 db    20 dup(0)
foo ends
bar foo <?>

  assume edi:PTR foo         ; point edi to struct
  mov edi, offset bar        ; load struct address
  invoke strcpy, addr .c_b1, addr string

  ; blah blah blah
  ; do stuff

  assume edi:nothing

[japheth]

I confirm the second error (struct member as operand for SEG operator)

will be fixed in v2.07.

[japheth]

> Using struct member as argument to invoke (16bit) seems to fail, like:
> invoke strcpy, addr config.cf_path, string

You'll have to provide a full test case. I extended the code and I'm unable to see a problem:

.model small
.stack 128
foo struc
c_w1 dw ?
c_s2 db 12 dup (?)
foo ends
strcpy proto c :ptr byte, :ptr byte
.data
bar foo <?>
string dw szX
szX db "abc",0
.code
main proc
local x:foo
    invoke strcpy, addr bar.c_s2, string
    invoke strcpy, addr x.c_s2, string
    ret
main endp
start:
    mov ah,4Ch
    int 21h
end start

[Hjort Nidudsson]

As I remember (don’t find the old source) the strcpy code generated an exception, and I notice from the output that the segment was increased. I don’t remember the actual argument (.something), but I wrote the test from this assumption.