abs.c

来自「Mac OS X 10.4.9 for x86 Source Code gcc」· C语言 代码 · 共 38 行

extern int inside_main;
extern void abort (void);
#ifdef __OPTIMIZE__
#define ABORT_INSIDE_MAIN do { if (inside_main) abort (); } while (0)
#else
#define ABORT_INSIDE_MAIN do { } while (0)
#endif

typedef __INTMAX_TYPE__ intmax_t;

int
abs (int x)
{
  ABORT_INSIDE_MAIN;
  return x < 0 ? -x : x;
}

long
labs (long x)
{
  ABORT_INSIDE_MAIN;
  return x < 0 ? -x : x;
}

long long
llabs (long long x)
{
  ABORT_INSIDE_MAIN;
  return x < 0 ? -x : x;
}

intmax_t
imaxabs (intmax_t x)
{
  ABORT_INSIDE_MAIN;
  return x < 0 ? -x : x;
}