vasnprintf.c

gnu tar 源码包。 tar 软件是 Unix 系统下的一个打包软件

		length = augmented_length;
	      }
	    else
	      {
		do
		  result[length++] = (unsigned char) *cp++;
		while (--n > 0);
	      }
	  }
	if (i == d.count)
	  break;

	/* Execute a single directive.  */
	if (dp->conversion == '%')
	  {
	    size_t augmented_length;

	    if (!(dp->arg_index == ARG_NONE))
	      abort ();
	    augmented_length = xsum (length, 1);
	    ENSURE_ALLOCATION (augmented_length);
	    result[length] = '%';
	    length = augmented_length;
	  }
	else
	  {
	    if (!(dp->arg_index != ARG_NONE))
	      abort ();

	    if (dp->conversion == 'n')
	      {
		switch (a.arg[dp->arg_index].type)
		  {
		  case TYPE_COUNT_SCHAR_POINTER:
		    *a.arg[dp->arg_index].a.a_count_schar_pointer = length;
		    break;
		  case TYPE_COUNT_SHORT_POINTER:
		    *a.arg[dp->arg_index].a.a_count_short_pointer = length;
		    break;
		  case TYPE_COUNT_INT_POINTER:
		    *a.arg[dp->arg_index].a.a_count_int_pointer = length;
		    break;
		  case TYPE_COUNT_LONGINT_POINTER:
		    *a.arg[dp->arg_index].a.a_count_longint_pointer = length;
		    break;
#if HAVE_LONG_LONG_INT
		  case TYPE_COUNT_LONGLONGINT_POINTER:
		    *a.arg[dp->arg_index].a.a_count_longlongint_pointer = length;
		    break;
#endif
		  default:
		    abort ();
		  }
	      }
#if ENABLE_UNISTDIO
	    /* The unistdio extensions.  */
	    else if (dp->conversion == 'U')
	      {
		arg_type type = a.arg[dp->arg_index].type;
		int flags = dp->flags;
		int has_width;
		size_t width;
		int has_precision;
		size_t precision;

		has_width = 0;
		width = 0;
		if (dp->width_start != dp->width_end)
		  {
		    if (dp->width_arg_index != ARG_NONE)
		      {
			int arg;

			if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
			  abort ();
			arg = a.arg[dp->width_arg_index].a.a_int;
			if (arg < 0)
			  {
			    /* "A negative field width is taken as a '-' flag
			        followed by a positive field width."  */
			    flags |= FLAG_LEFT;
			    width = (unsigned int) (-arg);
			  }
			else
			  width = arg;
		      }
		    else
		      {
			const FCHAR_T *digitp = dp->width_start;

			do
			  width = xsum (xtimes (width, 10), *digitp++ - '0');
			while (digitp != dp->width_end);
		      }
		    has_width = 1;
		  }

		has_precision = 0;
		precision = 0;
		if (dp->precision_start != dp->precision_end)
		  {
		    if (dp->precision_arg_index != ARG_NONE)
		      {
			int arg;

			if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
			  abort ();
			arg = a.arg[dp->precision_arg_index].a.a_int;
			/* "A negative precision is taken as if the precision
			    were omitted."  */
			if (arg >= 0)
			  {
			    precision = arg;
			    has_precision = 1;
			  }
		      }
		    else
		      {
			const FCHAR_T *digitp = dp->precision_start + 1;

			precision = 0;
			while (digitp != dp->precision_end)
			  precision = xsum (xtimes (precision, 10), *digitp++ - '0');
			has_precision = 1;
		      }
		  }

		switch (type)
		  {
		  case TYPE_U8_STRING:
		    {
		      const uint8_t *arg = a.arg[dp->arg_index].a.a_u8_string;
		      const uint8_t *arg_end;
		      size_t characters;

		      if (has_precision)
			{
			  /* Use only PRECISION characters, from the left.  */
			  arg_end = arg;
			  characters = 0;
			  for (; precision > 0; precision--)
			    {
			      int count = u8_strmblen (arg_end);
			      if (count == 0)
				break;
			      if (count < 0)
				{
				  if (!(result == resultbuf || result == NULL))
				    free (result);
				  if (buf_malloced != NULL)
				    free (buf_malloced);
				  CLEANUP ();
				  errno = EILSEQ;
				  return NULL;
				}
			      arg_end += count;
			      characters++;
			    }
			}
		      else if (has_width)
			{
			  /* Use the entire string, and count the number of
			     characters.  */
			  arg_end = arg;
			  characters = 0;
			  for (;;)
			    {
			      int count = u8_strmblen (arg_end);
			      if (count == 0)
				break;
			      if (count < 0)
				{
				  if (!(result == resultbuf || result == NULL))
				    free (result);
				  if (buf_malloced != NULL)
				    free (buf_malloced);
				  CLEANUP ();
				  errno = EILSEQ;
				  return NULL;
				}
			      arg_end += count;
			      characters++;
			    }
			}
		      else
			{
			  /* Use the entire string.  */
			  arg_end = arg + u8_strlen (arg);
			  /* The number of characters doesn't matter.  */
			  characters = 0;
			}

		      if (has_width && width > characters
			  && !(dp->flags & FLAG_LEFT))
			{
			  size_t n = width - characters;
			  ENSURE_ALLOCATION (xsum (length, n));
			  DCHAR_SET (result + length, ' ', n);
			  length += n;
			}

# if DCHAR_IS_UINT8_T
		      {
			size_t n = arg_end - arg;
			ENSURE_ALLOCATION (xsum (length, n));
			DCHAR_CPY (result + length, arg, n);
			length += n;
		      }
# else
		      { /* Convert.  */
			DCHAR_T *converted = result + length;
			size_t converted_len = allocated - length;
#  if DCHAR_IS_TCHAR
			/* Convert from UTF-8 to locale encoding.  */
			if (u8_conv_to_encoding (locale_charset (),
						 iconveh_question_mark,
						 arg, arg_end - arg, NULL,
						 &converted, &converted_len)
			    < 0)
#  else
			/* Convert from UTF-8 to UTF-16/UTF-32.  */
			converted =
			  U8_TO_DCHAR (arg, arg_end - arg,
				       converted, &converted_len);
			if (converted == NULL)
#  endif
			  {
			    int saved_errno = errno;
			    if (!(result == resultbuf || result == NULL))
			      free (result);
			    if (buf_malloced != NULL)
			      free (buf_malloced);
			    CLEANUP ();
			    errno = saved_errno;
			    return NULL;
			  }
			if (converted != result + length)
			  {
			    ENSURE_ALLOCATION (xsum (length, converted_len));
			    DCHAR_CPY (result + length, converted, converted_len);
			    free (converted);
			  }
			length += converted_len;
		      }
# endif

		      if (has_width && width > characters
			  && (dp->flags & FLAG_LEFT))
			{
			  size_t n = width - characters;
			  ENSURE_ALLOCATION (xsum (length, n));
			  DCHAR_SET (result + length, ' ', n);
			  length += n;
			}
		    }
		    break;

		  case TYPE_U16_STRING:
		    {
		      const uint16_t *arg = a.arg[dp->arg_index].a.a_u16_string;
		      const uint16_t *arg_end;
		      size_t characters;

		      if (has_precision)
			{
			  /* Use only PRECISION characters, from the left.  */
			  arg_end = arg;
			  characters = 0;
			  for (; precision > 0; precision--)
			    {
			      int count = u16_strmblen (arg_end);
			      if (count == 0)
				break;
			      if (count < 0)
				{
				  if (!(result == resultbuf || result == NULL))
				    free (result);
				  if (buf_malloced != NULL)
				    free (buf_malloced);
				  CLEANUP ();
				  errno = EILSEQ;
				  return NULL;
				}
			      arg_end += count;
			      characters++;
			    }
			}
		      else if (has_width)
			{
			  /* Use the entire string, and count the number of
			     characters.  */
			  arg_end = arg;
			  characters = 0;
			  for (;;)
			    {
			      int count = u16_strmblen (arg_end);
			      if (count == 0)
				break;
			      if (count < 0)
				{
				  if (!(result == resultbuf || result == NULL))
				    free (result);
				  if (buf_malloced != NULL)
				    free (buf_malloced);
				  CLEANUP ();
				  errno = EILSEQ;
				  return NULL;
				}
			      arg_end += count;
			      characters++;
			    }
			}
		      else
			{
			  /* Use the entire string.  */
			  arg_end = arg + u16_strlen (arg);
			  /* The number of characters doesn't matter.  */
			  characters = 0;
			}

		      if (has_width && width > characters
			  && !(dp->flags & FLAG_LEFT))
			{
			  size_t n = width - characters;
			  ENSURE_ALLOCATION (xsum (length, n));
			  DCHAR_SET (result + length, ' ', n);
			  length += n;
			}

# if DCHAR_IS_UINT16_T
		      {
			size_t n = arg_end - arg;
			ENSURE_ALLOCATION (xsum (length, n));
			DCHAR_CPY (result + length, arg, n);
			length += n;
		      }
# else
		      { /* Convert.  */
			DCHAR_T *converted = result + length;
			size_t converted_len = allocated - length;
#  if DCHAR_IS_TCHAR
			/* Convert from UTF-16 to locale encoding.  */
			if (u16_conv_to_encoding (locale_charset (),
						  iconveh_question_mark,
						  arg, arg_end - arg, NULL,
						  &converted, &converted_len)
			    < 0)
#  else
			/* Convert from UTF-16 to UTF-8/UTF-32.  */
			converted =
			  U16_TO_DCHAR (arg, arg_end - arg,
					converted, &converted_len);
			if (converted == NULL)
#  endif
			  {
			    int saved_errno = errno;
			    if (!(result == resultbuf || result == NULL))
			      free (result);
			    if (buf_malloced != NULL)
			      free (buf_malloced);
			    CLEANUP ();
			    errno = saved_errno;
			    return NULL;
			  }
			if (converted != result + length)
			  {
			    ENSURE_ALLOCATION (xsum (length, converted_len));
			    DCHAR_CPY (result + length, converted, converted_len);
			    free (converted);
			  }
			length += converted_len;
		      }
# endif

		      if (has_width && width > characters
			  && (dp->flags & FLAG_LEFT))
			{
			  size_t n = width - characters;
			  ENSURE_ALLOCATION (xsum (length, n));
			  DCHAR_SET (result + length, ' ', n);
			  length += n;
			}
		    }
		    break;

		  case TYPE_U32_STRING:
		    {
		      const uint32_t *arg = a.arg[dp->arg_index].a.a_u32_string;
		      const uint32_t *arg_end;
		      size_t characters;

		      if (has_precision)
			{
			  /* Use only PRECISION characters, from the left.  */
			  arg_end = arg;
			  characters = 0;
			  for (; precision > 0; precision--)
			    {
			      int count = u32_strmblen (arg_end);
			      if (count == 0)
				break;
			      if (count < 0)
				{
				  if (!(result == resultbuf || result == NULL))
				    free (result);
				  if (buf_malloced != NULL)
				    free (buf_malloced);
				  CLEANUP ();
				  errno = EILSEQ;
				  return NULL;
				}
			      arg_end += count;
			      characters++;
			    }
			}
		      else if (has_width)
			{
			  /* Use the entire string, and count the number of
			     characters.  */
			  arg_end = arg;
			  characters = 0;
			  for (;;)
			    {
			      int count = u32_strmblen (arg_end);
			      if (count == 0)
				break;
			      if (count < 0)
				{
				  if (!(result == resultbuf || result == NULL))
				    free (result);
				  if (buf_malloced != NULL)
				    free (buf_malloced);
				  CLEANUP ();
				  errno = EILSEQ;
				  return NULL;
				}
			      arg_end += count;
			      characters++;
			    }
			}
		      else
			{
			  /* Use the entire string.  */
			  arg_end = arg + u32_strlen (arg);
			  /* The number of characters doesn't matter.  */
			  characters = 0;
			}

		      if (has_width && width > characters
			  && !(dp->flags & FLAG_LEFT))
			{
			  size_t n = width - characters;
			  ENSURE_ALLOCATION (xsum (length, n));
			  DCHAR_SET (result + length, ' ', n);
			  length += n;
			}

# if DCHAR_IS_UINT32_T
		      {
			size_t n = arg_end - arg;
			ENSURE_ALLOCATION (xsum (length, n));
			DCHAR_CPY (result + length, arg, n);
			length += n;
		      }
# else
		      { /* Convert.  */
			DCHAR_T *converted = result + length;
			size_t converted_len = allocated - length;
#  if DCHAR_IS_TCHAR
			/* Convert from UTF-32 to locale encoding.  */
			if (u32_conv_to_encoding (locale_charset (),
						  iconveh_question_mark,
						  arg, arg_end - arg, NULL,
						  &converted, &converted_len)
			    < 0)
#  else
			/* Convert from UTF-32 to UTF-8/UTF-16.  */
			converted =
			  U32_TO_DCHAR (arg, arg_end - arg,
					converted, &converted_len);
			if (converted == NULL)
#  endif
			  {
			    int saved_errno = errno;
			    if (!(result == resultbuf || result == NULL))
			      free (result);
			    if (buf_malloced != NULL)
			      free (buf_malloced);
			    CLEANUP ();
			    errno = saved_errno;
			    return NULL;
			  }
			if (converted != result + length)
			  {
			    ENSURE_ALLOCATION (xsum (length, converted_len));
			    DCHAR_CPY (result + length, converted, converted_len);
			    free (converted);
			  }
			length += converted_len;
		      }
# endif

		      if (has_width && width > characters
			  && (dp->flags & FLAG_LEFT))
			{
			  size_t n = width - characters;
			  ENSURE_ALLOCATION (xsum (length, n));