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typedef long unsigned int size_t;

extern void abort (void);

extern char *strcpy (char *, const char *);

extern int strcmp (const char *, const char *);

typedef __builtin_va_list va_list;

static const char null[] = "(null)";

int g (char *s, const char *format, va_list ap)

{

  const char *f;

  const char *string;

  char spec;

  static const void *step0_jumps[] = {

    &&do_precision,

    &&do_form_integer,

    &&do_form_string,

  };

  f = format;

  if (*f == '\0')

    goto all_done;

  do

    {

      spec = (*++f);

      goto *(step0_jumps[2]);

    /* begin switch table. */

    do_precision:

      ++f;

      __builtin_va_arg (ap, int);

      spec = *f;

      goto *(step0_jumps[2]);

      do_form_integer:

        __builtin_va_arg (ap, unsigned long int);

        goto end;

      do_form_string:

        string = __builtin_va_arg (ap, const char *);

        strcpy (s, string);

      /* End of switch table. */

      end:

      ++f;

    }

  while (*f != '\0');

all_done:

  return 0;

}

void

f (char *s, const char *f, ...)

{

  va_list ap;

  __builtin_va_start (ap, f);

  g (s, f, ap);

  __builtin_va_end (ap);

}

int

main (void)

{

  char buf[10];

  f (buf, "%s", "asdf", 0);

  if (strcmp (buf, "asdf"))

    abort ();

  return 0;

}