1 /* Print size value using units for orders of magnitude.
2 Copyright (C) 1997-2002, 2004, 2006 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, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
27 #include <gnu/option-groups.h>
30 /* This defines make it possible to use the same code for GNU C library and
31 the GNU I/O library. */
32 #define PUT(f, s, n) _IO_sputn (f, s, n)
33 #define PAD(f, c, n) (wide ? _IO_wpadn (f, c, n) : INTUSE(_IO_padn) (f, c, n))
34 /* We use this file GNU C library and GNU I/O library. So make
37 #define putc(c, f) (wide \
38 ? (int)_IO_putwc_unlocked (c, f) : _IO_putc_unlocked (c, f))
39 #define size_t _IO_size_t
42 /* Macros for doing the actual output. */
47 register const int outc = (ch); \
48 if (putc (outc, fp) == EOF) \
53 #define PRINT(ptr, wptr, len) \
56 register size_t outlen = (len); \
59 if (PUT (fp, wide ? (const char *) wptr : ptr, outlen) != outlen) \
67 while (outlen-- > 0) \
70 while (outlen-- > 0) \
75 #define PADN(ch, len) \
78 if (PAD (fp, ch, len) != len) \
84 /* Prototype for helper functions. */
85 extern int __printf_fp (FILE *fp, const struct printf_info *info,
86 const void *const *args);
90 __printf_size (FILE *fp, const struct printf_info *info,
91 const void *const *args)
93 /* Units for the both formats. */
94 #define BINARY_UNITS " kmgtpezy"
95 #define DECIMAL_UNITS " KMGTPEZY"
96 static const char units[2][sizeof (BINARY_UNITS)] =
98 BINARY_UNITS, /* For binary format. */
99 DECIMAL_UNITS /* For decimal format. */
101 const char *tag = units[isupper (info->spec) != 0];
102 int divisor = isupper (info->spec) ? 1000 : 1024;
104 /* The floating-point value to output. */
107 union ieee754_double dbl;
108 union ieee854_long_double ldbl;
111 const void *ptr = &fpnum;
115 /* "NaN" or "Inf" for the special cases. */
116 const char *special = NULL;
117 const wchar_t *wspecial = NULL;
119 struct printf_info fp_info;
121 #if __OPTION_POSIX_C_LANG_WIDE_CHAR
122 int wide = info->wide;
124 /* This should never be called on a wide-oriented stream when
125 OPTION_POSIX_C_LANG_WIDE_CHAR is disabled, but the compiler can't
126 be trusted to figure that out. */
131 /* Fetch the argument value. */
132 #ifndef __NO_LONG_DOUBLE_MATH
133 if (info->is_long_double && sizeof (long double) > sizeof (double))
135 fpnum.ldbl.d = *(const long double *) args[0];
137 /* Check for special values: not a number or infinity. */
138 if (__isnanl (fpnum.ldbl.d))
144 else if (__isinfl (fpnum.ldbl.d))
149 negative = fpnum.ldbl.d < 0;
152 while (fpnum.ldbl.d >= divisor && tag[1] != '\0')
154 fpnum.ldbl.d /= divisor;
159 #endif /* no long double */
161 fpnum.dbl.d = *(const double *) args[0];
163 /* Check for special values: not a number or infinity. */
164 if (__isnan (fpnum.dbl.d))
170 else if (__isinf (fpnum.dbl.d))
175 negative = fpnum.dbl.d < 0;
178 while (fpnum.dbl.d >= divisor && tag[1] != '\0')
180 fpnum.dbl.d /= divisor;
187 int width = info->prec > info->width ? info->prec : info->width;
189 if (negative || info->showsign || info->space)
193 if (!info->left && width > 0)
198 else if (info->showsign)
200 else if (info->space)
203 PRINT (special, wspecial, 3);
205 if (info->left && width > 0)
211 /* Prepare to print the number. We want to use `__printf_fp' so we
212 have to prepare a `printf_info' structure. */
215 fp_info.prec = info->prec < 0 ? 3 : info->prec;
218 if (fp_info.left && fp_info.pad == L' ')
220 /* We must do the padding ourself since the unit character must
221 be placed before the padding spaces. */
224 done = __printf_fp (fp, &fp_info, &ptr);
228 if (info->width > done)
229 PADN (' ', info->width - done);
234 /* We can let __printf_fp do all the printing and just add our
235 unit character afterwards. */
236 fp_info.width = info->width - 1;
238 done = __printf_fp (fp, &fp_info, &ptr);
245 ldbl_strong_alias (__printf_size, printf_size);
247 /* This is the function used by `vfprintf' to determine number and
248 type of the arguments. */
250 printf_size_info (const struct printf_info *info, size_t n, int *argtypes)
252 /* We need only one double or long double argument. */
254 argtypes[0] = PA_DOUBLE | (info->is_long_double ? PA_FLAG_LONG_DOUBLE : 0);