+#if !USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF
+
+/* Use a different function name, to make it possible that the 'wchar_t'
+ parametrization and the 'char' parametrization get compiled in the same
+ translation unit. */
+# if WIDE_CHAR_VERSION
+# define MAX_ROOM_NEEDED wmax_room_needed
+# else
+# define MAX_ROOM_NEEDED max_room_needed
+# endif
+
+/* Returns the number of TCHAR_T units needed as temporary space for the result
+ of sprintf or SNPRINTF of a single conversion directive. */
+static size_t
+MAX_ROOM_NEEDED (const arguments *ap, size_t arg_index, FCHAR_T conversion,
+ arg_type type, int flags, size_t width, int has_precision,
+ size_t precision, int pad_ourselves)
+{
+ size_t tmp_length;
+
+ switch (conversion)
+ {
+ case 'd': case 'i': case 'u':
+# if HAVE_LONG_LONG_INT
+ if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
+ tmp_length =
+ (unsigned int) (sizeof (unsigned long long) * CHAR_BIT
+ * 0.30103 /* binary -> decimal */
+ )
+ + 1; /* turn floor into ceil */
+ else
+# endif
+ if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
+ tmp_length =
+ (unsigned int) (sizeof (unsigned long) * CHAR_BIT
+ * 0.30103 /* binary -> decimal */
+ )
+ + 1; /* turn floor into ceil */
+ else
+ tmp_length =
+ (unsigned int) (sizeof (unsigned int) * CHAR_BIT
+ * 0.30103 /* binary -> decimal */
+ )
+ + 1; /* turn floor into ceil */
+ if (tmp_length < precision)
+ tmp_length = precision;
+ /* Multiply by 2, as an estimate for FLAG_GROUP. */
+ tmp_length = xsum (tmp_length, tmp_length);
+ /* Add 1, to account for a leading sign. */
+ tmp_length = xsum (tmp_length, 1);
+ break;
+
+ case 'o':
+# if HAVE_LONG_LONG_INT
+ if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
+ tmp_length =
+ (unsigned int) (sizeof (unsigned long long) * CHAR_BIT
+ * 0.333334 /* binary -> octal */
+ )
+ + 1; /* turn floor into ceil */
+ else
+# endif
+ if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
+ tmp_length =
+ (unsigned int) (sizeof (unsigned long) * CHAR_BIT
+ * 0.333334 /* binary -> octal */
+ )
+ + 1; /* turn floor into ceil */
+ else
+ tmp_length =
+ (unsigned int) (sizeof (unsigned int) * CHAR_BIT
+ * 0.333334 /* binary -> octal */
+ )
+ + 1; /* turn floor into ceil */
+ if (tmp_length < precision)
+ tmp_length = precision;
+ /* Add 1, to account for a leading sign. */
+ tmp_length = xsum (tmp_length, 1);
+ break;
+
+ case 'x': case 'X':
+# if HAVE_LONG_LONG_INT
+ if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
+ tmp_length =
+ (unsigned int) (sizeof (unsigned long long) * CHAR_BIT
+ * 0.25 /* binary -> hexadecimal */
+ )
+ + 1; /* turn floor into ceil */
+ else
+# endif
+ if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
+ tmp_length =
+ (unsigned int) (sizeof (unsigned long) * CHAR_BIT
+ * 0.25 /* binary -> hexadecimal */
+ )
+ + 1; /* turn floor into ceil */
+ else
+ tmp_length =
+ (unsigned int) (sizeof (unsigned int) * CHAR_BIT
+ * 0.25 /* binary -> hexadecimal */
+ )
+ + 1; /* turn floor into ceil */
+ if (tmp_length < precision)
+ tmp_length = precision;
+ /* Add 2, to account for a leading sign or alternate form. */
+ tmp_length = xsum (tmp_length, 2);
+ break;
+
+ case 'f': case 'F':
+ if (type == TYPE_LONGDOUBLE)
+ tmp_length =
+ (unsigned int) (LDBL_MAX_EXP
+ * 0.30103 /* binary -> decimal */
+ * 2 /* estimate for FLAG_GROUP */
+ )
+ + 1 /* turn floor into ceil */
+ + 10; /* sign, decimal point etc. */
+ else
+ tmp_length =
+ (unsigned int) (DBL_MAX_EXP
+ * 0.30103 /* binary -> decimal */
+ * 2 /* estimate for FLAG_GROUP */
+ )
+ + 1 /* turn floor into ceil */
+ + 10; /* sign, decimal point etc. */
+ tmp_length = xsum (tmp_length, precision);
+ break;
+
+ case 'e': case 'E': case 'g': case 'G':
+ tmp_length =
+ 12; /* sign, decimal point, exponent etc. */
+ tmp_length = xsum (tmp_length, precision);
+ break;
+
+ case 'a': case 'A':
+ if (type == TYPE_LONGDOUBLE)
+ tmp_length =
+ (unsigned int) (LDBL_DIG
+ * 0.831 /* decimal -> hexadecimal */
+ )
+ + 1; /* turn floor into ceil */
+ else
+ tmp_length =
+ (unsigned int) (DBL_DIG
+ * 0.831 /* decimal -> hexadecimal */
+ )
+ + 1; /* turn floor into ceil */
+ if (tmp_length < precision)
+ tmp_length = precision;
+ /* Account for sign, decimal point etc. */
+ tmp_length = xsum (tmp_length, 12);
+ break;
+
+ case 'c':
+# if HAVE_WINT_T && !WIDE_CHAR_VERSION
+ if (type == TYPE_WIDE_CHAR)
+ tmp_length = MB_CUR_MAX;
+ else
+# endif
+ tmp_length = 1;
+ break;
+
+ case 's':
+# if HAVE_WCHAR_T
+ if (type == TYPE_WIDE_STRING)
+ {
+# if WIDE_CHAR_VERSION
+ /* ISO C says about %ls in fwprintf:
+ "If the precision is not specified or is greater than the size
+ of the array, the array shall contain a null wide character."
+ So if there is a precision, we must not use wcslen. */
+ const wchar_t *arg = ap->arg[arg_index].a.a_wide_string;
+
+ if (has_precision)
+ tmp_length = local_wcsnlen (arg, precision);
+ else
+ tmp_length = local_wcslen (arg);
+# else
+ /* ISO C says about %ls in fprintf:
+ "If a precision is specified, no more than that many bytes are
+ written (including shift sequences, if any), and the array
+ shall contain a null wide character if, to equal the multibyte
+ character sequence length given by the precision, the function
+ would need to access a wide character one past the end of the
+ array."
+ So if there is a precision, we must not use wcslen. */
+ /* This case has already been handled separately in VASNPRINTF. */
+ abort ();
+# endif
+ }
+ else
+# endif
+ {
+# if WIDE_CHAR_VERSION
+ /* ISO C says about %s in fwprintf:
+ "If the precision is not specified or is greater than the size
+ of the converted array, the converted array shall contain a
+ null wide character."
+ So if there is a precision, we must not use strlen. */
+ /* This case has already been handled separately in VASNPRINTF. */
+ abort ();
+# else
+ /* ISO C says about %s in fprintf:
+ "If the precision is not specified or greater than the size of
+ the array, the array shall contain a null character."
+ So if there is a precision, we must not use strlen. */
+ const char *arg = ap->arg[arg_index].a.a_string;
+
+ if (has_precision)
+ tmp_length = local_strnlen (arg, precision);
+ else
+ tmp_length = strlen (arg);
+# endif
+ }
+ break;
+
+ case 'p':
+ tmp_length =
+ (unsigned int) (sizeof (void *) * CHAR_BIT
+ * 0.25 /* binary -> hexadecimal */
+ )
+ + 1 /* turn floor into ceil */
+ + 2; /* account for leading 0x */
+ break;
+
+ default:
+ abort ();
+ }
+
+ if (!pad_ourselves)
+ {
+# if ENABLE_UNISTDIO
+ /* Padding considers the number of characters, therefore the number of
+ elements after padding may be
+ > max (tmp_length, width)
+ but is certainly
+ <= tmp_length + width. */
+ tmp_length = xsum (tmp_length, width);
+# else
+ /* Padding considers the number of elements, says POSIX. */
+ if (tmp_length < width)
+ tmp_length = width;
+# endif
+ }
+
+ tmp_length = xsum (tmp_length, 1); /* account for trailing NUL */
+
+ return tmp_length;
+}
+
+#endif
+