import ctypes::*;

export libc;
export libc_constants;
export pipe;
export fd_FILE;
export close;
export fclose;
export waitpid;
export getcwd;
export exec_suffix;
export target_os;
export dylib_filename;
export get_exe_path;

// FIXME Refactor into unix_os module or some such. Doesn't
// seem to work right now.

#[link_name = ""]
#[abi = "cdecl"]
native mod libc {
    fn read(fd: fd_t, buf: *u8, count: size_t) -> ssize_t;
    fn write(fd: fd_t, buf: *u8, count: size_t) -> ssize_t;
    fn fread(buf: *u8, size: size_t, n: size_t, f: libc::FILE) -> size_t;
    fn fwrite(buf: *u8, size: size_t, n: size_t, f: libc::FILE) -> size_t;
    fn open(s: str::sbuf, flags: c_int, mode: unsigned) -> fd_t;
    fn close(fd: fd_t) -> int;
    type FILE;
    fn fopen(path: str::sbuf, mode: str::sbuf) -> FILE;
    fn fdopen(fd: fd_t, mode: str::sbuf) -> FILE;
    fn fclose(f: FILE);
    fn fgetc(f: FILE) -> c_int;
    fn ungetc(c: c_int, f: FILE);
    fn feof(f: FILE) -> c_int;
    fn fseek(f: FILE, offset: long, whence: c_int) -> c_int;
    fn ftell(f: FILE) -> long;
    type dir;
    fn opendir(d: str::sbuf) -> dir;
    fn closedir(d: dir) -> c_int;
    type dirent;
    fn readdir(d: dir) -> dirent;
    fn getenv(n: str::sbuf) -> str::sbuf;
    fn setenv(n: str::sbuf, v: str::sbuf, overwrite: c_int) -> c_int;
    fn unsetenv(n: str::sbuf) -> c_int;
    fn pipe(buf: *mutable fd_t) -> c_int;
    fn waitpid(pid: pid_t, &status: c_int, options: c_int) -> pid_t;
}

mod libc_constants {
    const O_RDONLY: int   = 0i32;
    const O_WRONLY: int   = 1i32;
    const O_RDWR: int     = 2i32;
    const O_APPEND: int   = 8i32;
    const O_CREAT: int    = 512i32;
    const O_EXCL: int     = 2048i32;
    const O_TRUNC: int    = 1024i32;
    const O_TEXT: int     = 0i32;    // nonexistent in darwin libc
    const O_BINARY: int   = 0i32;    // nonexistent in darwin libc

    const S_IRUSR: uint   = 256u32;
    const S_IWUSR: uint   = 128u32;
}

fn pipe() -> {in: fd_t, out: fd_t} {
    let fds = {mutable in: 0i32, mutable out: 0i32};
    assert (os::libc::pipe(ptr::mut_addr_of(fds.in)) == 0i32);
    ret {in: fds.in, out: fds.out};
}

fn fd_FILE(fd: fd_t) -> libc::FILE {
    ret str::as_buf("r", {|modebuf| libc::fdopen(fd, modebuf) });
}

fn close(fd: fd_t) -> int {
    libc::close(fd)
}

fn fclose(file: libc::FILE) {
    libc::fclose(file)
}

fn waitpid(pid: pid_t) -> i32 {
    let status = 0i32;
    assert (os::libc::waitpid(pid, status, 0i32) != -1i32);
    ret status;
}

#[abi = "cdecl"]
native mod rustrt {
    fn rust_getcwd() -> str;
}

fn getcwd() -> str { ret rustrt::rust_getcwd(); }

native "cdecl" mod mac_libc = "" {
    fn _NSGetExecutablePath(buf: str::sbuf,
                            bufsize: *mutable uint32_t) -> c_int;
}

fn exec_suffix() -> str { ret ""; }

fn target_os() -> str { ret "macos"; }

fn dylib_filename(base: str) -> str { ret "lib" + base + ".dylib"; }

fn get_exe_path() -> option::t<fs::path> {
    // FIXME: This doesn't handle the case where the buffer is too small
    let bufsize = 1023u32;
    let path = str::unsafe_from_bytes(vec::init_elt(0u8, bufsize as uint));
    ret str::as_buf(path, { |path_buf|
        if mac_libc::_NSGetExecutablePath(path_buf,
                                          ptr::mut_addr_of(bufsize)) == 0i32 {
            option::some(fs::dirname(path) + fs::path_sep())
        } else {
            option::none
        }
    });
}

// Local Variables:
// mode: rust;
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End: