1 | /* Print size value using units for orders of magnitude. |
2 | Copyright (C) 1997-2016 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>. |
6 | |
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. |
11 | |
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. |
16 | |
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/>. */ |
20 | |
21 | #include <ctype.h> |
22 | #include <ieee754.h> |
23 | #include <math.h> |
24 | #include <printf.h> |
25 | #include <libioP.h> |
26 | |
27 | |
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 |
33 | names equal. */ |
34 | #undef putc |
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 |
38 | #define FILE _IO_FILE |
39 | |
40 | /* Macros for doing the actual output. */ |
41 | |
42 | #define outchar(ch) \ |
43 | do \ |
44 | { \ |
45 | const int outc = (ch); \ |
46 | if (putc (outc, fp) == EOF) \ |
47 | return -1; \ |
48 | ++done; \ |
49 | } while (0) |
50 | |
51 | #define PRINT(ptr, wptr, len) \ |
52 | do \ |
53 | { \ |
54 | size_t outlen = (len); \ |
55 | if (len > 20) \ |
56 | { \ |
57 | if (PUT (fp, wide ? (const char *) wptr : ptr, outlen) != outlen) \ |
58 | return -1; \ |
59 | ptr += outlen; \ |
60 | done += outlen; \ |
61 | } \ |
62 | else \ |
63 | { \ |
64 | if (wide) \ |
65 | while (outlen-- > 0) \ |
66 | outchar (*wptr++); \ |
67 | else \ |
68 | while (outlen-- > 0) \ |
69 | outchar (*ptr++); \ |
70 | } \ |
71 | } while (0) |
72 | |
73 | #define PADN(ch, len) \ |
74 | do \ |
75 | { \ |
76 | if (PAD (fp, ch, len) != len) \ |
77 | return -1; \ |
78 | done += len; \ |
79 | } \ |
80 | while (0) |
81 | |
82 | /* Prototype for helper functions. */ |
83 | extern int __printf_fp (FILE *fp, const struct printf_info *info, |
84 | const void *const *args); |
85 | |
86 | |
87 | int |
88 | __printf_size (FILE *fp, const struct printf_info *info, |
89 | const void *const *args) |
90 | { |
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)] = |
95 | { |
96 | BINARY_UNITS, /* For binary format. */ |
97 | DECIMAL_UNITS /* For decimal format. */ |
98 | }; |
99 | const char *tag = units[isupper (info->spec) != 0]; |
100 | int divisor = isupper (info->spec) ? 1000 : 1024; |
101 | |
102 | /* The floating-point value to output. */ |
103 | union |
104 | { |
105 | union ieee754_double dbl; |
106 | long double ldbl; |
107 | } |
108 | fpnum; |
109 | const void *ptr = &fpnum; |
110 | |
111 | int is_neg = 0; |
112 | |
113 | /* "NaN" or "Inf" for the special cases. */ |
114 | const char *special = NULL; |
115 | const wchar_t *wspecial = NULL; |
116 | |
117 | struct printf_info fp_info; |
118 | int done = 0; |
119 | int wide = info->wide; |
120 | |
121 | /* Fetch the argument value. */ |
122 | #ifndef __NO_LONG_DOUBLE_MATH |
123 | if (info->is_long_double && sizeof (long double) > sizeof (double)) |
124 | { |
125 | fpnum.ldbl = *(const long double *) args[0]; |
126 | |
127 | /* Check for special values: not a number or infinity. */ |
128 | if (isnan (fpnum.ldbl)) |
129 | { |
130 | special = "nan" ; |
131 | wspecial = L"nan" ; |
132 | // is_neg = 0; Already zero |
133 | } |
134 | else if (isinf (fpnum.ldbl)) |
135 | { |
136 | is_neg = signbit (fpnum.ldbl); |
137 | special = "inf" ; |
138 | wspecial = L"inf" ; |
139 | } |
140 | else |
141 | while (fpnum.ldbl >= divisor && tag[1] != '\0') |
142 | { |
143 | fpnum.ldbl /= divisor; |
144 | ++tag; |
145 | } |
146 | } |
147 | else |
148 | #endif /* no long double */ |
149 | { |
150 | fpnum.dbl.d = *(const double *) args[0]; |
151 | |
152 | /* Check for special values: not a number or infinity. */ |
153 | if (isnan (fpnum.dbl.d)) |
154 | { |
155 | special = "nan" ; |
156 | wspecial = L"nan" ; |
157 | // is_neg = 0; Already zero |
158 | } |
159 | else if (isinf (fpnum.dbl.d)) |
160 | { |
161 | is_neg = signbit (fpnum.dbl.d); |
162 | special = "inf" ; |
163 | wspecial = L"inf" ; |
164 | } |
165 | else |
166 | while (fpnum.dbl.d >= divisor && tag[1] != '\0') |
167 | { |
168 | fpnum.dbl.d /= divisor; |
169 | ++tag; |
170 | } |
171 | } |
172 | |
173 | if (special) |
174 | { |
175 | int width = info->prec > info->width ? info->prec : info->width; |
176 | |
177 | if (is_neg || info->showsign || info->space) |
178 | --width; |
179 | width -= 3; |
180 | |
181 | if (!info->left && width > 0) |
182 | PADN (' ', width); |
183 | |
184 | if (is_neg) |
185 | outchar ('-'); |
186 | else if (info->showsign) |
187 | outchar ('+'); |
188 | else if (info->space) |
189 | outchar (' '); |
190 | |
191 | PRINT (special, wspecial, 3); |
192 | |
193 | if (info->left && width > 0) |
194 | PADN (' ', width); |
195 | |
196 | return done; |
197 | } |
198 | |
199 | /* Prepare to print the number. We want to use `__printf_fp' so we |
200 | have to prepare a `printf_info' structure. */ |
201 | fp_info = *info; |
202 | fp_info.spec = 'f'; |
203 | fp_info.prec = info->prec < 0 ? 3 : info->prec; |
204 | fp_info.wide = wide; |
205 | |
206 | if (fp_info.left && fp_info.pad == L' ') |
207 | { |
208 | /* We must do the padding ourself since the unit character must |
209 | be placed before the padding spaces. */ |
210 | fp_info.width = 0; |
211 | |
212 | done = __printf_fp (fp, &fp_info, &ptr); |
213 | if (done > 0) |
214 | { |
215 | outchar (*tag); |
216 | if (info->width > done) |
217 | PADN (' ', info->width - done); |
218 | } |
219 | } |
220 | else |
221 | { |
222 | /* We can let __printf_fp do all the printing and just add our |
223 | unit character afterwards. */ |
224 | fp_info.width = info->width - 1; |
225 | |
226 | done = __printf_fp (fp, &fp_info, &ptr); |
227 | if (done > 0) |
228 | outchar (*tag); |
229 | } |
230 | |
231 | return done; |
232 | } |
233 | ldbl_strong_alias (__printf_size, printf_size); |
234 | |
235 | /* This is the function used by `vfprintf' to determine number and |
236 | type of the arguments. */ |
237 | int |
238 | printf_size_info (const struct printf_info *info, size_t n, int *argtypes) |
239 | { |
240 | /* We need only one double or long double argument. */ |
241 | if (n >= 1) |
242 | argtypes[0] = PA_DOUBLE | (info->is_long_double ? PA_FLAG_LONG_DOUBLE : 0); |
243 | |
244 | return 1; |
245 | } |
246 | |