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void foo(const char *format, ...)
{
va_list ap;
int len;
char buf[20];
long long l = 1234567890;
l *= 100;
va_start(ap, format);
len = vsnprintf(buf, 0, format, ap);
va_end(ap);
if (len != 5) exit(1);
va_start(ap, format);
len = vsnprintf(0, 0, format, ap);
va_end(ap);
if (len != 5) exit(2);
if (snprintf(buf, 3, "hello") != 5 || strcmp(buf, "he") != 0) exit(3);
if (snprintf(buf, 20, "%lld", l) != 12 || strcmp(buf, "123456789000") != 0) exit(4);
if (snprintf(buf, 20, "%zu", 123456789) != 9 || strcmp(buf, "123456789") != 0) exit(5);
if (snprintf(buf, 20, "%2\$d %1\$d", 3, 4) != 3 || strcmp(buf, "4 3") != 0) exit(6);
if (snprintf(buf, 20, "%s", 0) < 3) exit(7);
printf("1");
exit(0);
}
int main(void) { foo("hello"); }
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