module IO::generic_readable - stringio: Ruby Standard Library Documentation

read_nonblock(integer[, outbuf [, opts]]) → string click to toggle source

Similar to read, but raises EOFError at end of string unless the +exception: false+ option is passed in.

static VALUE
strio_read_nonblock(int argc, VALUE *argv, VALUE self)
{
    VALUE opts = Qnil, val;

    rb_scan_args(argc, argv, "11:", NULL, NULL, &opts);

    if (!NIL_P(opts)) {
        argc--;
    }

    val = strio_read(argc, argv, self);
    if (NIL_P(val)) {
        if (!NIL_P(opts) &&
              rb_hash_lookup2(opts, sym_exception, Qundef) == Qfalse)
            return Qnil;
        else
            rb_eof_error();
    }

    return val;
}

readbyte → byte click to toggle source

Like getbyte, but raises an exception if already at end-of-stream; see Byte IO.

static VALUE
strio_readbyte(VALUE self)
{
    VALUE c = rb_funcallv(self, rb_intern("getbyte"), 0, 0);
    if (NIL_P(c)) rb_eof_error();
    return c;
}

readchar → string click to toggle source

Like getc, but raises an exception if already at end-of-stream; see Character IO.

static VALUE
strio_readchar(VALUE self)
{
    VALUE c = rb_funcallv(self, rb_intern("getc"), 0, 0);
    if (NIL_P(c)) rb_eof_error();
    return c;
}

readline(sep = $/, chomp: false) → string click to toggle source

readline(limit, chomp: false) → string

readline(sep, limit, chomp: false) → string

Reads a line as with IO#gets, but raises EOFError if already at end-of-file; see Line IO.

static VALUE
strio_readline(int argc, VALUE *argv, VALUE self)
{
    VALUE line = rb_funcallv_kw(self, rb_intern("gets"), argc, argv, RB_PASS_CALLED_KEYWORDS);
    if (NIL_P(line)) rb_eof_error();
    return line;
}

readpartial(integer[, outbuf]) → string

Similar to read, but raises EOFError at end of string instead of returning nil, as well as IO#sysread does.

Alias for: sysread

sysread(integer[, outbuf]) → string click to toggle source

Similar to read, but raises EOFError at end of string instead of returning nil, as well as IO#sysread does.

static VALUE
strio_sysread(int argc, VALUE *argv, VALUE self)
{
    VALUE val = rb_funcallv_kw(self, rb_intern("read"), argc, argv, RB_PASS_CALLED_KEYWORDS);
    if (NIL_P(val)) {
        rb_eof_error();
    }
    return val;
}

Also aliased as: readpartial