1 /* Print size value using units for orders of magnitude. 2 Copyright (C) 1997,1998,1999,2000,2001,2002 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, write to the Free 19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 20 02111-1307 USA. */ 21 22 #include <libioP.h> 23 24 #include <stdio_private.h> 25 #include <ctype.h> 26 #include <ieee754.h> 27 #include <math.h> 28 #include <printf.h> 29 30 31 /* This defines make it possible to use the same code for GNU C library and 32 the GNU I/O library. */ 33 #ifdef USE_IN_LIBIO 34 # define PUT(f, s, n) _IO_sputn (f, s, n) 35 # define PAD(f, c, n) (wide ? _IO_wpadn (f, c, n) : INTUSE(_IO_padn) (f, c, n)) 36 /* We use this file GNU C library and GNU I/O library. So make 37 names equal. */ 38 # undef putc 39 # define putc(c, f) (wide \ 40 ? (int)_IO_putwc_unlocked (c, f) : _IO_putc_unlocked (c, f)) 41 # define size_t _IO_size_t 42 # define FILE _IO_FILE 43 #else /* ! USE_IN_LIBIO */ 44 # define PUT(f, s, n) fwrite (s, 1, n, f) 45 # define PAD(f, c, n) __printf_pad (f, c, n) 46 ssize_t __printf_pad __P ((FILE *, char pad, int n)); /* In vfprintf.c. */ 47 #endif /* USE_IN_LIBIO */ 48 49 /* Macros for doing the actual output. */ 50 51 #define outchar(ch) \ 52 do \ 53 { \ 54 register const int outc = (ch); \ 55 if (putc (outc, fp) == EOF) \ 56 return -1; \ 57 ++done; \ 58 } while (0) 59 60 #define PRINT(ptr, wptr, len) \ 61 do \ 62 { \ 63 register size_t outlen = (len); \ 64 if (len > 20) \ 65 { \ 66 if (PUT (fp, wide ? (const char *) wptr : ptr, outlen) != outlen) \ 67 return -1; \ 68 ptr += outlen; \ 69 done += outlen; \ 70 } \ 71 else \ 72 { \ 73 if (wide) \ 74 while (outlen-- > 0) \ 75 outchar (*wptr++); \ 76 else \ 77 while (outlen-- > 0) \ 78 outchar (*ptr++); \ 79 } \ 80 } while (0) 81 82 #define PADN(ch, len) \ 83 do \ 84 { \ 85 if (PAD (fp, ch, len) != len) \ 86 return -1; \ 87 done += len; \ 88 } \ 89 while (0) 90 91 92 int 93 printf_size (FILE *fp, const struct printf_info *info, const void *const *args) 94 { 95 /* Units for the both formats. */ 96 #define BINARY_UNITS " kmgtpezy" 97 #define DECIMAL_UNITS " KMGTPEZY" 98 static const char units[2][sizeof (BINARY_UNITS)] = 99 { 100 BINARY_UNITS, /* For binary format. */ 101 DECIMAL_UNITS /* For decimal format. */ 102 }; 103 const char *tag = units[isupper (info->spec) != 0]; 104 int divisor = isupper (info->spec) ? 1000 : 1024; 105 106 /* The floating-point value to output. */ 107 union 108 { 109 union ieee754_double dbl; 110 union ieee854_long_double ldbl; 111 } 112 fpnum; 113 const void *ptr = &fpnum; 114 115 int negative = 0; 116 117 /* "NaN" or "Inf" for the special cases. */ 118 const char *special = NULL; 119 const wchar_t *wspecial = NULL; 120 121 struct printf_info fp_info; 122 int done = 0; 123 int wide = info->wide; 124 125 126 /* Fetch the argument value. */ 127 #ifndef __NO_LONG_DOUBLE_MATH 128 if (info->is_long_double && sizeof (long double) > sizeof (double)) 129 { 130 fpnum.ldbl.d = *(const long double *) args[0]; 131 132 /* Check for special values: not a number or infinity. */ 133 if (isnan (fpnum.ldbl.d)) 134 { 135 special = "nan"; 136 wspecial = L"nan"; 137 negative = 0; 138 } 139 else if (isinf (fpnum.ldbl.d)) 140 { 141 special = "inf"; 142 wspecial = L"inf"; 143 144 negative = fpnum.ldbl.d < 0; 145 } 146 else 147 while (fpnum.ldbl.d >= divisor && tag[1] != '\0') 148 { 149 fpnum.ldbl.d /= divisor; 150 ++tag; 151 } 152 } 153 else 154 #endif /* no long double */ 155 { 156 fpnum.dbl.d = *(const double *) args[0]; 157 158 /* Check for special values: not a number or infinity. */ 159 if (isnan (fpnum.dbl.d)) 160 { 161 special = "nan"; 162 wspecial = L"nan"; 163 negative = 0; 164 } 165 else if (isinf (fpnum.dbl.d)) 166 { 167 special = "inf"; 168 wspecial = L"inf"; 169 170 negative = fpnum.dbl.d < 0; 171 } 172 else 173 while (fpnum.dbl.d >= divisor && tag[1] != '\0') 174 { 175 fpnum.dbl.d /= divisor; 176 ++tag; 177 } 178 } 179 180 if (special) 181 { 182 int width = info->prec > info->width ? info->prec : info->width; 183 184 if (negative || info->showsign || info->space) 185 --width; 186 width -= 3; 187 188 if (!info->left && width > 0) 189 PADN (' ', width); 190 191 if (negative) 192 outchar ('-'); 193 else if (info->showsign) 194 outchar ('+'); 195 else if (info->space) 196 outchar (' '); 197 198 PRINT (special, wspecial, 3); 199 200 if (info->left && width > 0) 201 PADN (' ', width); 202 203 return done; 204 } 205 206 /* Prepare to print the number. We want to use `__printf_fp' so we 207 have to prepare a `printf_info' structure. */ 208 fp_info.spec = 'f'; 209 fp_info.prec = info->prec < 0 ? 3 : info->prec; 210 fp_info.is_long_double = info->is_long_double; 211 fp_info.is_short = info->is_short; 212 fp_info.is_long = info->is_long; 213 fp_info.alt = info->alt; 214 fp_info.space = info->space; 215 fp_info.left = info->left; 216 fp_info.showsign = info->showsign; 217 fp_info.group = info->group; 218 fp_info.extra = info->extra; 219 fp_info.pad = info->pad; 220 fp_info.wide = wide; 221 222 if (fp_info.left && fp_info.pad == L' ') 223 { 224 /* We must do the padding ourself since the unit character must 225 be placed before the padding spaces. */ 226 fp_info.width = 0; 227 228 done = __printf_fp (fp, &fp_info, &ptr); 229 if (done > 0) 230 { 231 outchar (*tag); 232 if (info->width > done) 233 PADN (' ', info->width - done); 234 } 235 } 236 else 237 { 238 /* We can let __printf_fp do all the printing and just add our 239 unit character afterwards. */ 240 fp_info.width = info->width - 1; 241 242 done = __printf_fp (fp, &fp_info, &ptr); 243 if (done > 0) 244 outchar (*tag); 245 } 246 247 return done; 248 } 249 250 /* This is the function used by `vfprintf' to determine number and 251 type of the arguments. */ 252 int 253 printf_size_info (const struct printf_info *info, size_t n, int *argtypes) 254 { 255 /* We need only one double or long double argument. */ 256 if (n >= 1) 257 argtypes[0] = PA_DOUBLE | (info->is_long_double ? PA_FLAG_LONG_DOUBLE : 0); 258 259 return 1; 260 } 261