itos.h

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#pragma once
 
#include <stdio.h>
 
struct itos_ {
  // space to print a NUL-terminated ≤128-bit signed integer
  char str[41];
};
 
static inline struct itos_ itos_(long long i) {
  struct itos_ s;
  snprintf(s.str, sizeof(s.str), "%lld", i);
  return s;
}
 
#define ITOS(i) (itos_(i).str)