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string.c: shrink too big buffer

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* string.c (rb_str_resize): shrink the buffer even if new length
  is same but it is enough smaller than the capacity.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46408 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2014-06-12 04:09:26 +00:00
parent dfd8c5d402
commit b35a6f91d2
1 changed files with 4 additions and 1 deletions
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5
string.c
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@ -1969,9 +1969,10 @@ rb_str_resize(VALUE str, long len)
ENC_CODERANGE_CLEAR(str);
slen = RSTRING_LEN(str);
if (len != slen) {
{
const int termlen = TERM_LEN(str);
if (STR_EMBED_P(str)) {
if (len == slen) return str;
if (len + termlen <= RSTRING_EMBED_LEN_MAX + 1) {
STR_SET_EMBED_LEN(str, len);
TERM_FILL(RSTRING(str)->as.ary + len, termlen);
@ -1990,11 +1991,13 @@ rb_str_resize(VALUE str, long len)
return str;
}
else if (!independent) {
if (len == slen) return str;
str_make_independent_expand(str, len - slen);
}
else if (slen < len || slen - len > 1024) {
REALLOC_N(RSTRING(str)->as.heap.ptr, char, len + termlen);
}
else if (len == slen) return str;
RSTRING(str)->as.heap.aux.capa = len;
RSTRING(str)->as.heap.len = len;
TERM_FILL(RSTRING(str)->as.heap.ptr + len, termlen); /* sentinel */