printf()のソースコードで、ソースコードリーディングのコツを身に付ける：main()関数の前には何があるのか（5）（2/3 ページ）

219:/* The function itself. */
220:int
221:vfprintf (FILE *s, const CHAR_T *format, va_list ap)
222:{
223: /* The character used as thousands separator. */
224:#ifdef COMPILE_WPRINTF
225: wchar_t thousands_sep = L'\0';
226:#else
227: const char *thousands_sep = NULL;
228:#endif
...

550:	LABEL (form_integer):							\
551:	/* Signed decimal integer. */						\
552:	base = 10;								\
553:										\
554:	if (is_longlong)							\
555:	   {									\
...
567:	   }									\
568:	 else									\
569:	   {									\
570:	     long int signed_number;						\
571:										\
572:	     if (fspec == NULL)							\
573:		{								\
574:		  if (is_long_num)						\
575:		     signed_number = va_arg (ap, long int);			\
576:		  else if (is_char)						\
577:		    signed_number = (signed char) va_arg (ap, unsigned int);	\
578:		  else if (!is_short)						\
579:		    signed_number = va_arg (ap, int);				\
580:		  else								\
581:		    signed_number = (short int) va_arg (ap, unsigned int);	\
582:		}								\
...

542:#define process_arg(fspec)							\
543:	  /* Start real work. We know about all flags and modifiers and		\
544:	     now process the wanted format specifier. */			\
545:	LABEL (form_percent):							\
546:	  /* Write a literal "%". */						\
547:	  outchar (L_('%'));							\
548:	  break;								\

147:#define outchar(Ch) \
148:	do									\
149:	  {									\
150:	   const INT_T outc = (Ch);						\
151:	   if (PUTC (outc, s) == EOF || done == INT_MAX)			\
152:	     {									\
153:	       done = -1;							\
154:	       goto all_done;							\
155:	     }									\
156:	   ++done;								\
157:	  }									\
158:	while (0)

...
102:# define PUTC(C, F) _IO_putc_unlocked (C, F)
...

412:#define _IO_putc_unlocked(_ch, _fp) \
413:	(_IO_BE ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end, 0) \
414:	 ? __overflow (_fp, (unsigned char) (_ch)) \
415:	 : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))