Function mi_printf_amount

3rd/mimalloc-2.0.9/src/stats.c:135–161

unit > 0 : size in binary bytes unit == 0: count as decimal unit < 0 : count in binary

// unit == 0: count as decimal
// unit < 0 : count in binary
static void mi_printf_amount(int64_t n, int64_t unit, mi_output_fun* out, void* arg, const char* fmt) {
  char buf[32]; buf[0] = 0;
  int  len = 32;
  const char* suffix = (unit <= 0 ? " " : "B");
  const int64_t base = (unit == 0 ? 1000 : 1024);
  if (unit>0) n *= unit;

  const int64_t pos = (n < 0 ? -n : n);
  if (pos < base) {
    if (n!=1 || suffix[0] != 'B') {  // skip printing 1 B for the unit column
      snprintf(buf, len, "%d %-3s", (int)n, (n==0 ? "" : suffix));
    }
  }
  else {
    int64_t divider = base;
    const char* magnitude = "K";
    if (pos >= divider*base) { divider *= base; magnitude = "M"; }
    if (pos >= divider*base) { divider *= base; magnitude = "G"; }
    const int64_t tens = (n / (divider/10));
    const long whole = (long)(tens/10);
    const long frac1 = (long)(tens%10);
    char unitdesc[8];
    snprintf(unitdesc, 8, "%s%s%s", magnitude, (base==1024 ? "i" : ""), suffix);
    snprintf(buf, len, "%ld.%ld %-3s", whole, (frac1 < 0 ? -frac1 : frac1), unitdesc);
  }
  _mi_fprintf(out, arg, (fmt==NULL ? "%11s" : fmt), buf);
}


static void mi_print_amount(int64_t n, int64_t unit, mi_output_fun* out, void* arg) {