diff options
Diffstat (limited to 'string.c')
-rw-r--r-- | string.c | 9 |
1 files changed, 5 insertions, 4 deletions
@@ -4567,13 +4567,14 @@ rb_str_setbyte(VALUE str, VALUE index, VALUE value) { long pos = NUM2LONG(index); int byte = NUM2INT(value); + long len = RSTRING_LEN(str); - rb_str_modify(str); - - if (pos < -RSTRING_LEN(str) || RSTRING_LEN(str) <= pos) + if (pos < -len || len <= pos) rb_raise(rb_eIndexError, "index %ld out of string", pos); if (pos < 0) - pos += RSTRING_LEN(str); + pos += len; + + rb_str_modify(str); RSTRING_PTR(str)[pos] = byte; |