1 /* Print size value using units for orders of magnitude.
2 Copyright (C) 1997-2013 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5 Based on a proposal by Larry McVoy <lm@sgi.com>.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
28 /* This defines make it possible to use the same code for GNU C library and
29 the GNU I/O library. */
30 #define PUT(f, s, n) _IO_sputn (f, s, n)
31 #define PAD(f, c, n) (wide ? _IO_wpadn (f, c, n) : _IO_padn (f, c, n))
32 /* We use this file GNU C library and GNU I/O library. So make
35 #define putc(c, f) (wide \
36 ? (int)_IO_putwc_unlocked (c, f) : _IO_putc_unlocked (c, f))
37 #define size_t _IO_size_t
40 /* Macros for doing the actual output. */
45 const int outc = (ch); \
46 if (putc (outc, fp) == EOF) \
51 #define PRINT(ptr, wptr, len) \
54 size_t outlen = (len); \
57 if (PUT (fp, wide ? (const char *) wptr : ptr, outlen) != outlen) \
65 while (outlen-- > 0) \
68 while (outlen-- > 0) \
73 #define PADN(ch, len) \
76 if (PAD (fp, ch, len) != len) \
82 /* Prototype for helper functions. */
83 extern int __printf_fp (FILE *fp, const struct printf_info *info,
84 const void *const *args);
88 __printf_size (FILE *fp, const struct printf_info *info,
89 const void *const *args)
91 /* Units for the both formats. */
92 #define BINARY_UNITS " kmgtpezy"
93 #define DECIMAL_UNITS " KMGTPEZY"
94 static const char units[2][sizeof (BINARY_UNITS)] =
96 BINARY_UNITS, /* For binary format. */
97 DECIMAL_UNITS /* For decimal format. */
99 const char *tag = units[isupper (info->spec) != 0];
100 int divisor = isupper (info->spec) ? 1000 : 1024;
102 /* The floating-point value to output. */
105 union ieee754_double dbl;
106 union ieee854_long_double ldbl;
109 const void *ptr = &fpnum;
113 /* "NaN" or "Inf" for the special cases. */
114 const char *special = NULL;
115 const wchar_t *wspecial = NULL;
117 struct printf_info fp_info;
119 int wide = info->wide;
122 /* Fetch the argument value. */
123 #ifndef __NO_LONG_DOUBLE_MATH
124 if (info->is_long_double && sizeof (long double) > sizeof (double))
126 fpnum.ldbl.d = *(const long double *) args[0];
128 /* Check for special values: not a number or infinity. */
129 if (__isnanl (fpnum.ldbl.d))
133 // fpnum_sign = 0; Already zero
135 else if ((res = __isinfl (fpnum.ldbl.d)))
142 while (fpnum.ldbl.d >= divisor && tag[1] != '\0')
144 fpnum.ldbl.d /= divisor;
149 #endif /* no long double */
151 fpnum.dbl.d = *(const double *) args[0];
153 /* Check for special values: not a number or infinity. */
154 if (__isnan (fpnum.dbl.d))
158 // fpnum_sign = 0; Already zero
160 else if ((res = __isinf (fpnum.dbl.d)))
167 while (fpnum.dbl.d >= divisor && tag[1] != '\0')
169 fpnum.dbl.d /= divisor;
176 int width = info->prec > info->width ? info->prec : info->width;
178 if (fpnum_sign < 0 || info->showsign || info->space)
182 if (!info->left && width > 0)
187 else if (info->showsign)
189 else if (info->space)
192 PRINT (special, wspecial, 3);
194 if (info->left && width > 0)
200 /* Prepare to print the number. We want to use `__printf_fp' so we
201 have to prepare a `printf_info' structure. */
204 fp_info.prec = info->prec < 0 ? 3 : info->prec;
207 if (fp_info.left && fp_info.pad == L' ')
209 /* We must do the padding ourself since the unit character must
210 be placed before the padding spaces. */
213 done = __printf_fp (fp, &fp_info, &ptr);
217 if (info->width > done)
218 PADN (' ', info->width - done);
223 /* We can let __printf_fp do all the printing and just add our
224 unit character afterwards. */
225 fp_info.width = info->width - 1;
227 done = __printf_fp (fp, &fp_info, &ptr);
234 ldbl_strong_alias (__printf_size, printf_size);
236 /* This is the function used by `vfprintf' to determine number and
237 type of the arguments. */
239 printf_size_info (const struct printf_info *info, size_t n, int *argtypes)
241 /* We need only one double or long double argument. */
243 argtypes[0] = PA_DOUBLE | (info->is_long_double ? PA_FLAG_LONG_DOUBLE : 0);