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sprintf.c: NULL as str

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* sprintf.c (ruby_vsnprintf, ruby_snprintf): allow NULL as str,
  just count the expected buffer size.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59789 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-09-09 09:16:59 +00:00
parent 6c3c48e3d5
commit 067d9e9ce9
3 changed files with 26 additions and 6 deletions
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8
ext/-test-/printf/printf.c
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@ -90,6 +90,13 @@ printf_test_call(int argc, VALUE *argv, VALUE self)
return rb_assoc_new(result, rb_usascii_str_new_cstr(format));
}
static VALUE
snprintf_count(VALUE self, VALUE str)
{
int n = ruby_snprintf(NULL, 0, "%s", StringValueCStr(str));
return INT2FIX(n);
}
void
Init_printf(void)
{
@ -98,4 +105,5 @@ Init_printf(void)
rb_define_singleton_method(m, "v", printf_test_v, 1);
rb_define_singleton_method(m, "q", printf_test_q, 1);
rb_define_singleton_method(m, "call", printf_test_call, -1);
rb_define_singleton_method(m, "sncount", snprintf_count, 1);
}