method

syswrite

v1_9_1_378 - Show latest stable - 0 notes - Class: StringIO

syswrite(p1) public

Appends the given string to the underlying buffer string of strio. The stream must be opened for writing. If the argument is not a string, it will be converted to a string using to_s. Returns the number of bytes written. See IO#write.

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static VALUE
strio_write(VALUE self, VALUE str)
{
    struct StringIO *ptr = writable(StringIO(self));
    long len, olen;
    rb_encoding *enc, *enc2;

    if (TYPE(str) != T_STRING)
        str = rb_obj_as_string(str);
    enc = rb_enc_get(ptr->string);
    enc2 = rb_enc_get(str);
    if (enc != enc2 && enc != rb_ascii8bit_encoding()) {
        str = rb_str_conv_enc(str, enc2, enc);
    }
    len = RSTRING_LEN(str);
    if (len == 0) return INT2FIX(0);
    check_modifiable(ptr);
    olen = RSTRING_LEN(ptr->string);
    if (ptr->flags & FMODE_APPEND) {
        ptr->pos = olen;
    }
    if (ptr->pos == olen) {
        rb_str_cat(ptr->string, RSTRING_PTR(str), len);
    }
    else {
        strio_extend(ptr, ptr->pos, len);
        memmove(RSTRING_PTR(ptr->string)+ptr->pos, RSTRING_PTR(str), len);
        OBJ_INFECT(ptr->string, str);
    }
    OBJ_INFECT(ptr->string, self);
    ptr->pos += len;
    return LONG2NUM(len);
}

syswrite

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