io.c: read more data

* io.c (rb_io_each_codepoint): read more data when read partially.
  [ruby-core:70379] [Bug #11444]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51583 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 17 insertions, 0 deletions

diff --git a/io.c b/io.c
index 104f521378..fc973bc5c8 100644
--- a/io.c
+++ b/io.c
@@ -3763,8 +3763,25 @@ rb_io_each_codepoint(VALUE io)
 	    rb_yield(UINT2NUM(c));
 	}
 	else if (MBCLEN_INVALID_P(r)) {
+	  invalid:
 	    rb_raise(rb_eArgError, "invalid byte sequence in %s", rb_enc_name(enc));
 	}
+	else if (MBCLEN_NEEDMORE_P(r)) {
+	    char cbuf[8], *p = cbuf;
+	    int more = MBCLEN_NEEDMORE_LEN(r);
+	    if (more > numberof(cbuf)) goto invalid;
+	    more += n = fptr->rbuf.len;
+	    if (more > numberof(cbuf)) goto invalid;
+	    while ((n = (int)read_buffered_data(p, more, fptr)) > 0 &&
+		   (p += n, (more -= n) > 0)) {
+		if (io_fillbuf(fptr) < 0) goto invalid;
+		if ((n = fptr->rbuf.len) > more) n = more;
+	    }
+	    r = rb_enc_precise_mbclen(cbuf, p, enc);
+	    if (!MBCLEN_CHARFOUND_P(r)) goto invalid;
+	    c = rb_enc_codepoint(cbuf, p, enc);
+	    rb_yield(UINT2NUM(c));
+	}
 	else {
 	    continue;
 	}