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iostream.jl
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iostream.jl
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## IOStream
const sizeof_ios_t = int(ccall(:jl_sizeof_ios_t, Int32, ()))
type IOStream <: IO
handle::Ptr{Void}
ios::Array{UInt8,1}
name::AbstractString
mark::Int64
IOStream(name::AbstractString, buf::Array{UInt8,1}) = new(pointer(buf), buf, name, -1)
end
# TODO: delay adding finalizer, e.g. for memio with a small buffer, or
# in the case where we takebuf it.
function IOStream(name::AbstractString, finalize::Bool)
buf = zeros(UInt8,sizeof_ios_t)
x = IOStream(name, buf)
if finalize
finalizer(x, close)
end
return x
end
IOStream(name::AbstractString) = IOStream(name, true)
convert(T::Type{Ptr{Void}}, s::IOStream) = convert(T, s.ios)
show(io::IO, s::IOStream) = print(io, "IOStream(", s.name, ")")
fd(s::IOStream) = int(ccall(:jl_ios_fd, Clong, (Ptr{Void},), s.ios))
stat(s::IOStream) = stat(fd(s))
close(s::IOStream) = ccall(:ios_close, Void, (Ptr{Void},), s.ios)
isopen(s::IOStream) = bool(ccall(:ios_isopen, Cint, (Ptr{Void},), s.ios))
function flush(s::IOStream)
sigatomic_begin()
systemerror("flush", ccall(:ios_flush, Cint, (Ptr{Void},), s.ios) != 0)
sigatomic_end()
s
end
iswritable(s::IOStream) = bool(ccall(:ios_get_writable, Cint, (Ptr{Void},), s.ios))
isreadable(s::IOStream) = bool(ccall(:ios_get_readable, Cint, (Ptr{Void},), s.ios))
modestr(s::IO) = modestr(isreadable(s), iswritable(s))
modestr(r::Bool, w::Bool) = r ? (w ? "r+" : "r") : (w ? "w" : error("Neither readable nor writable"))
function truncate(s::IOStream, n::Integer)
systemerror("truncate", ccall(:ios_trunc, Int32, (Ptr{Void}, UInt), s.ios, n) != 0)
return s
end
function seek(s::IOStream, n::Integer)
ret = ccall(:ios_seek, FileOffset, (Ptr{Void}, FileOffset), s.ios, n)
systemerror("seek", ret == -1)
ret < -1 && error("seek failed")
return s
end
seekstart(s::IO) = seek(s,0)
function seekend(s::IOStream)
systemerror("seekend", ccall(:ios_seek_end, FileOffset, (Ptr{Void},), s.ios) != 0)
return s
end
function skip(s::IOStream, delta::Integer)
ret = ccall(:ios_skip, FileOffset, (Ptr{Void}, FileOffset), s.ios, delta)
systemerror("skip", ret == -1)
ret < -1 && error("skip failed")
return s
end
function position(s::IOStream)
pos = ccall(:ios_pos, FileOffset, (Ptr{Void},), s.ios)
systemerror("position", pos == -1)
return pos
end
eof(s::IOStream) = ccall(:ios_eof_blocking, Int32, (Ptr{Void},), s.ios)!=0
# For interfacing with C FILE* functions
immutable CFILE
ptr::Ptr{Void}
end
function CFILE(s::IO)
@unix_only FILEp = ccall(:fdopen, Ptr{Void}, (Cint, Ptr{UInt8}), convert(Cint, fd(s)), modestr(s))
@windows_only FILEp = ccall(:_fdopen, Ptr{Void}, (Cint, Ptr{UInt8}), convert(Cint, fd(s)), modestr(s))
systemerror("fdopen", FILEp == C_NULL)
seek(CFILE(FILEp), position(s))
end
convert(::Type{CFILE}, s::IO) = CFILE(s)
function seek(h::CFILE, offset::Integer)
systemerror("fseek", ccall(:fseek, Cint, (Ptr{Void}, Clong, Cint),
h.ptr, convert(Clong, offset), int32(0)) != 0)
h
end
position(h::CFILE) = ccall(:ftell, Clong, (Ptr{Void},), h.ptr)
## constructing and opening streams ##
# "own" means the descriptor will be closed with the IOStream
function fdio(name::AbstractString, fd::Integer, own::Bool=false)
s = IOStream(name)
ccall(:ios_fd, Ptr{Void}, (Ptr{Void}, Clong, Int32, Int32),
s.ios, fd, 0, own);
return s
end
fdio(fd::Integer, own::Bool=false) = fdio(string("<fd ",fd,">"), fd, own)
function open(fname::AbstractString, rd::Bool, wr::Bool, cr::Bool, tr::Bool, ff::Bool)
s = IOStream(string("<file ",fname,">"))
systemerror("opening file $fname",
ccall(:ios_file, Ptr{Void},
(Ptr{UInt8}, Ptr{UInt8}, Int32, Int32, Int32, Int32),
s.ios, fname, rd, wr, cr, tr) == C_NULL)
if ff
systemerror("seeking to end of file $fname", ccall(:ios_seek_end, FileOffset, (Ptr{Void},), s.ios) != 0)
end
return s
end
open(fname::AbstractString) = open(fname, true, false, false, false, false)
function open(fname::AbstractString, mode::AbstractString)
mode == "r" ? open(fname, true , false, false, false, false) :
mode == "r+" ? open(fname, true , true , false, false, false) :
mode == "w" ? open(fname, false, true , true , true , false) :
mode == "w+" ? open(fname, true , true , true , true , false) :
mode == "a" ? open(fname, false, true , true , false, true ) :
mode == "a+" ? open(fname, true , true , true , false, true ) :
error("invalid open mode: ", mode)
end
function open(f::Function, args...)
io = open(args...)
try
f(io)
finally
close(io)
end
end
## low-level calls ##
write(s::IOStream, b::UInt8) = int(ccall(:ios_putc, Int32, (UInt8, Ptr{Void}), b, s.ios))
function write{T}(s::IOStream, a::Array{T})
if isbits(T)
if !iswritable(s)
error("attempt to write to a read-only IOStream")
end
int(ccall(:ios_write, UInt, (Ptr{Void}, Ptr{Void}, UInt),
s.ios, a, length(a)*sizeof(T)))
else
invoke(write, (IO, Array), s, a)
end
end
function write(s::IOStream, p::Ptr, nb::Integer)
if !iswritable(s)
error("attempt to write to a read-only IOStream")
end
int(ccall(:ios_write, UInt, (Ptr{Void}, Ptr{Void}, UInt), s.ios, p, nb))
end
function write{T,N,A<:Array}(s::IOStream, a::SubArray{T,N,A})
if !isbits(T) || stride(a,1)!=1
return invoke(write, (Any, AbstractArray), s, a)
end
colsz = size(a,1)*sizeof(T)
if N<=1
return write(s, pointer(a, 1), colsz)
else
cartesianmap((idxs...)->write(s, pointer(a, idxs), colsz),
tuple(1, size(a)[2:end]...))
return colsz*trailingsize(a,2)
end
end
# num bytes available without blocking
nb_available(s::IOStream) = ccall(:jl_nb_available, Int32, (Ptr{Void},), s.ios)
function read(s::IOStream, ::Type{UInt8})
b = ccall(:ios_getc, Int32, (Ptr{Void},), s.ios)
if b == -1
throw(EOFError())
end
uint8(b)
end
function read!{T}(s::IOStream, a::Array{T})
if isbits(T)
nb = length(a)*sizeof(T)
if ccall(:ios_readall, UInt,
(Ptr{Void}, Ptr{Void}, UInt), s.ios, a, nb) < nb
throw(EOFError())
end
else
invoke(read!, (IO, Array), s, a)
end
a
end
## text I/O ##
function write(s::IOStream, c::Char)
if !iswritable(s)
error("attempt to write to a read-only IOStream")
end
int(ccall(:ios_pututf8, Int32, (Ptr{Void}, Char), s.ios, c))
end
read(s::IOStream, ::Type{Char}) = ccall(:jl_getutf8, Char, (Ptr{Void},), s.ios)
takebuf_string(s::IOStream) =
ccall(:jl_takebuf_string, ByteString, (Ptr{Void},), s.ios)
takebuf_array(s::IOStream) =
ccall(:jl_takebuf_array, Vector{UInt8}, (Ptr{Void},), s.ios)
function takebuf_raw(s::IOStream)
sz = position(s)
buf = ccall(:jl_takebuf_raw, Ptr{UInt8}, (Ptr{Void},), s.ios)
return buf, sz
end
function sprint(size::Integer, f::Function, args...)
s = IOBuffer(Array(UInt8,size), true, true)
truncate(s,0)
f(s, args...)
takebuf_string(s)
end
sprint(f::Function, args...) = sprint(0, f, args...)
write(x) = write(STDOUT::IO, x)
function readuntil(s::IOStream, delim::UInt8)
ccall(:jl_readuntil, Array{UInt8,1}, (Ptr{Void}, UInt8), s.ios, delim)
end
function readbytes!(s::IOStream, b::Array{UInt8}, nb=length(b))
olb = lb = length(b)
nr = 0
while !eof(s) && nr < nb
if lb < nr+1
lb = max(65536, (nr+1) * 2)
resize!(b, lb)
end
nr += int(ccall(:ios_readall, UInt,
(Ptr{Void}, Ptr{Void}, UInt),
s.ios, pointer(b, nr+1), min(lb-nr, nb-nr)))
end
if lb > olb
resize!(b, nr) # shrink to just contain input data if was resized
end
return nr
end
## Character streams ##
const _chtmp = Array(Char, 1)
function peekchar(s::IOStream)
if ccall(:ios_peekutf8, Int32, (Ptr{Void}, Ptr{Char}), s, _chtmp) < 0
return char(-1)
end
return _chtmp[1]
end
function peek(s::IOStream)
ccall(:ios_peekc, Int32, (Ptr{Void},), s)
end
function skipchars(s::IOStream, pred; linecomment::Char=char(0xffffffff))
ch = peekchar(s); status = int(ch)
while status >= 0 && (pred(ch) || ch == linecomment)
if ch == linecomment
readline(s)
else
read(s, Char) # advance one character
end
ch = peekchar(s); status = int(ch)
end
return s
end