llvm-project/compiler-rt/test/sanitizer_common/TestCases/scanf-ldbl.c

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// RUN: %clang %s -o %t && %run %t 2>&1
#include <assert.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv) {
long double ld;
memset(&ld, 255, sizeof ld);
sscanf("4.0", "%Lf", &ld);
assert(ld == 4.0);
return 0;
}