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Raise ArgumentError if sprintf format string ends with %

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* Add tests and specs. See ruby/spec#401.
  Patch by Yuta Iwama and Shintaro Morikawa.
  [ruby-core:80153] [Bug #13315] [Fix GH-1560]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58890 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
eregon 2017-05-25 15:33:28 +00:00
parent e779eee98b
commit fd8df3ab3d
3 changed files with 26 additions and 4 deletions
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5
sprintf.c
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@ -520,7 +520,10 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
VALUE sym = Qnil;
for (t = p; t < end && *t != '%'; t++) ;
if (t + 1 == end) ++t;
if (t + 1 == end) {
if (*t == '%') rb_raise(rb_eArgError, "incomplete format specifier");
++t;
}
PUSH(p, t - p);
if (coderange != ENC_CODERANGE_BROKEN && scanned < blen) {
scanned += rb_str_coderange_scan_restartable(buf+scanned, buf+blen, enc, &coderange);