diff options
Diffstat (limited to 'io.c')
-rw-r--r-- | io.c | 11 |
1 files changed, 8 insertions, 3 deletions
@@ -2072,7 +2072,7 @@ io_shift_cbuf(rb_io_t *fptr, int len, VALUE *strp) } static void -io_setstrbuf(VALUE *str,long len) +io_setstrbuf(VALUE *str, long len) { #ifdef _WIN32 len = (len + 1) & ~1L; /* round up for wide char */ @@ -2081,8 +2081,13 @@ io_setstrbuf(VALUE *str,long len) *str = rb_str_new(0, 0); } else { - StringValue(*str); - len -= RSTRING_LEN(*str); + VALUE s = StringValue(*str); + long clen = RSTRING_LEN(s); + if (clen >= len) { + if (clen != len) rb_str_set_len(s, len); + return; + } + len -= clen; } rb_str_modify_expand(*str, len); } |