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string.c: return reallocated pointer

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* string.c (str_fill_term): return new pointer reallocated by
  filling terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55212 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2016-05-30 07:20:28 +00:00
parent bfc9c3766f
commit 79a85b18cc
4 changed files with 36 additions and 1 deletions
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23
ext/-test-/string/cstr.c
View file

@ -49,6 +49,28 @@ bug_str_cstr_term_char(VALUE str)
return rb_enc_uint_chr((unsigned int)c, enc);
}
static VALUE
bug_str_unterminated_substring(VALUE str, VALUE vbeg, VALUE vlen)
{
long beg = NUM2LONG(vbeg);
long len = NUM2LONG(vlen);
rb_str_modify(str);
if (len < 0) rb_raise(rb_eArgError, "negative length: %ld", len);
if (RSTRING_LEN(str) < beg) rb_raise(rb_eIndexError, "beg: %ld", beg);
if (RSTRING_LEN(str) < beg + len) rb_raise(rb_eIndexError, "end: %ld", beg + len);
str = rb_str_new_shared(str);
if (STR_EMBED_P(str)) {
RSTRING(str)->basic.flags &= ~RSTRING_EMBED_LEN_MASK;
RSTRING(str)->basic.flags |= len << RSTRING_EMBED_LEN_SHIFT;
memmove(RSTRING(str)->as.ary, RSTRING(str)->as.ary + beg, len);
}
else {
RSTRING(str)->as.heap.ptr += beg;
RSTRING(str)->as.heap.len = len;
}
return str;
}
static VALUE
bug_str_s_cstr_term(VALUE self, VALUE str)
{
@ -114,6 +136,7 @@ Init_cstr(VALUE klass)
rb_define_method(klass, "cstr_term", bug_str_cstr_term, 0);
rb_define_method(klass, "cstr_unterm", bug_str_cstr_unterm, 1);
rb_define_method(klass, "cstr_term_char", bug_str_cstr_term_char, 0);
rb_define_method(klass, "unterminated_substring", bug_str_unterminated_substring, 2);
rb_define_singleton_method(klass, "cstr_term", bug_str_s_cstr_term, 1);
rb_define_singleton_method(klass, "cstr_unterm", bug_str_s_cstr_unterm, 2);
rb_define_singleton_method(klass, "cstr_term_char", bug_str_s_cstr_term_char, 1);