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Fix String#byteslice with MRB_UTF8_STRING and some edge cases

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Example:

  $ bin/mruby -e '
    p "あa".byteslice(1)
    p "bar".byteslice(3)
    p "bar".byteslice(4..0)
  '

  Before this patch:

    "a"
    ""
    RangeError (4..0 out of range)

  After this patch (same as Ruby):

    "\x81"
    nil
    nil
This commit is contained in:
KOBAYASHI Shuji
2019-06-25 22:58:21 +09:00
parent cb3ee2d050
commit 75df13a973
4 changed files with 101 additions and 58 deletions
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include/mruby/string.h
+3
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@@ -438,6 +438,9 @@ mrb_value mrb_str_inspect(mrb_state *mrb, mrb_value str);
#define mrb_str_buf_cat(mrb, str, ptr, len) mrb_str_cat(mrb, str, ptr, len)
#define mrb_str_buf_append(mrb, str, str2) mrb_str_cat_str(mrb, str, str2)
mrb_bool mrb_str_beg_len(mrb_int str_len, mrb_int *begp, mrb_int *lenp);
mrb_value mrb_str_byte_subseq(mrb_state *mrb, mrb_value str, mrb_int beg, mrb_int len);
#ifdef MRB_UTF8_STRING
mrb_int mrb_utf8_len(const char *str, mrb_int byte_len);
#endif