type file-state {
source: (handle buffered-file)
eof?: boolean
}
fn init-file-state _self: (addr file-state), filename: (addr array byte) {
var self/eax: (addr file-state) <- copy _self
load-file self, filename
var eof/eax: (addr boolean) <- get self, eof?
copy-to *eof, 0 # false
}
fn load-file _self: (addr file-state), filename: (addr array byte) {
var self/eax: (addr file-state) <- copy _self
var out/esi: (addr handle buffered-file) <- get self, source
open filename, 0, out # 0 = read mode
}
fn next-char _self: (addr file-state) -> result/eax: byte {
var self/ecx: (addr file-state) <- copy _self
var source/eax: (addr handle buffered-file) <- get self, source
var in/eax: (addr buffered-file) <- lookup *source
result <- read-byte-buffered in
# if result == EOF, set eof?
compare result, 0xffffffff # EOF marker
{
var eof/ecx: (addr boolean) <- get self, eof?
copy-to *eof, 1 # true
}
}
fn done-reading? _self: (addr file-state) -> result/eax: boolean {
var self/eax: (addr file-state) <- copy _self
var eof/eax: (addr boolean) <- get self, eof?
result <- copy *eof
}
fn dump in: (addr buffered-file) {
var c/eax: byte <- read-byte-buffered in
compare c, 0xffffffff # EOF marker
break-if-=
print-byte c
loop
}