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string.c: use the usable size

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* string.c (rb_str_change_terminator_length): when called after
  the content has been copied, old terminator length no longer
  makes sense.  use the whole usable size instead of capacity
  without terminator.  [ruby-core:80257] [Bug #13339]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58042 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-03-21 05:28:38 +00:00
parent c8d66b5d82
commit f0e6e47999
1 changed files with 3 additions and 3 deletions
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6
string.c
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@ -2102,11 +2102,11 @@ str_fill_term(VALUE str, char *s, long len, int termlen)
void
rb_str_change_terminator_length(VALUE str, const int oldtermlen, const int termlen)
{
long capa = str_capacity(str, oldtermlen);
long capa = str_capacity(str, oldtermlen) + oldtermlen;
long len = RSTRING_LEN(str);
assert(capa >= len);
if (capa - len < termlen - oldtermlen) {
if (capa - len < termlen) {
rb_check_lockedtmp(str);
str_make_independent_expand(str, len, 0L, termlen);
}
@ -2118,7 +2118,7 @@ rb_str_change_terminator_length(VALUE str, const int oldtermlen, const int terml
if (!STR_EMBED_P(str)) {
/* modify capa instead of realloc */
assert(!FL_TEST((str), STR_SHARED));
RSTRING(str)->as.heap.aux.capa = capa - (termlen - oldtermlen);
RSTRING(str)->as.heap.aux.capa = capa - termlen;
}
if (termlen > oldtermlen) {
TERM_FILL(RSTRING_PTR(str) + len, termlen);