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 /* Prototype for helper functions. */ 92 extern int __printf_fp (FILE *fp, const struct printf_info *info, 93 const void *const *args); 94 95 96 int 97 printf_size (FILE *fp, const struct printf_info *info, const void *const *args) 98 { 99 /* Units for the both formats. */ 100 #define BINARY_UNITS " kmgtpezy" 101 #define DECIMAL_UNITS " KMGTPEZY" 102 static const char units[2][sizeof (BINARY_UNITS)] = 103 { 104 BINARY_UNITS, /* For binary format. */ 105 DECIMAL_UNITS /* For decimal format. */ 106 }; 107 const char *tag = units[isupper (info->spec) != 0]; 108 int divisor = isupper (info->spec) ? 1000 : 1024; 109 110 /* The floating-point value to output. */ 111 union 112 { 113 union ieee754_double dbl; 114 union ieee854_long_double ldbl; 115 } 116 fpnum; 117 const void *ptr = &fpnum; 118 119 int negative = 0; 120 121 /* "NaN" or "Inf" for the special cases. */ 122 const char *special = NULL; 123 const wchar_t *wspecial = NULL; 124 125 struct printf_info fp_info; 126 int done = 0; 127 int wide = info->wide; 128 129 130 /* Fetch the argument value. */ 131 #ifndef __NO_LONG_DOUBLE_MATH 132 if (info->is_long_double && sizeof (long double) > sizeof (double)) 133 { 134 fpnum.ldbl.d = *(const long double *) args[0]; 135 136 /* Check for special values: not a number or infinity. */ 137 if (__isnanl (fpnum.ldbl.d)) 138 { 139 special = "nan"; 140 wspecial = L"nan"; 141 negative = 0; 142 } 143 else if (__isinfl (fpnum.ldbl.d)) 144 { 145 special = "inf"; 146 wspecial = L"inf"; 147 148 negative = fpnum.ldbl.d < 0; 149 } 150 else 151 while (fpnum.ldbl.d >= divisor && tag[1] != '\0') 152 { 153 fpnum.ldbl.d /= divisor; 154 ++tag; 155 } 156 } 157 else 158 #endif /* no long double */ 159 { 160 fpnum.dbl.d = *(const double *) args[0]; 161 162 /* Check for special values: not a number or infinity. */ 163 if (__isnan (fpnum.dbl.d)) 164 { 165 special = "nan"; 166 wspecial = L"nan"; 167 negative = 0; 168 } 169 else if (__isinf (fpnum.dbl.d)) 170 { 171 special = "inf"; 172 wspecial = L"inf"; 173 174 negative = fpnum.dbl.d < 0; 175 } 176 else 177 while (fpnum.dbl.d >= divisor && tag[1] != '\0') 178 { 179 fpnum.dbl.d /= divisor; 180 ++tag; 181 } 182 } 183 184 if (special) 185 { 186 int width = info->prec > width ? info->prec : info->width; 187 188 if (negative || info->showsign || info->space) 189 --width; 190 width -= 3; 191 192 if (!info->left && width > 0) 193 PADN (' ', width); 194 195 if (negative) 196 outchar ('-'); 197 else if (info->showsign) 198 outchar ('+'); 199 else if (info->space) 200 outchar (' '); 201 202 PRINT (special, wspecial, 3); 203 204 if (info->left && width > 0) 205 PADN (' ', width); 206 207 return done; 208 } 209 210 /* Prepare to print the number. We want to use `__printf_fp' so we 211 have to prepare a `printf_info' structure. */ 212 fp_info.spec = 'f'; 213 fp_info.prec = info->prec < 0 ? 3 : info->prec; 214 fp_info.is_long_double = info->is_long_double; 215 fp_info.is_short = info->is_short; 216 fp_info.is_long = info->is_long; 217 fp_info.alt = info->alt; 218 fp_info.space = info->space; 219 fp_info.left = info->left; 220 fp_info.showsign = info->showsign; 221 fp_info.group = info->group; 222 fp_info.extra = info->extra; 223 fp_info.pad = info->pad; 224 fp_info.wide = wide; 225 226 if (fp_info.left && fp_info.pad == L' ') 227 { 228 /* We must do the padding ourself since the unit character must 229 be placed before the padding spaces. */ 230 fp_info.width = 0; 231 232 done = __printf_fp (fp, &fp_info, &ptr); 233 if (done > 0) 234 { 235 outchar (*tag); 236 if (info->width > done) 237 PADN (' ', info->width - done); 238 } 239 } 240 else 241 { 242 /* We can let __printf_fp do all the printing and just add our 243 unit character afterwards. */ 244 fp_info.width = info->width - 1; 245 246 done = __printf_fp (fp, &fp_info, &ptr); 247 if (done > 0) 248 outchar (*tag); 249 } 250 251 return done; 252 } 253 254 /* This is the function used by `vfprintf' to determine number and 255 type of the arguments. */ 256 int 257 printf_size_info (const struct printf_info *info, size_t n, int *argtypes) 258 { 259 /* We need only one double or long double argument. */ 260 if (n >= 1) 261 argtypes[0] = PA_DOUBLE | (info->is_long_double ? PA_FLAG_LONG_DOUBLE : 0); 262 263 return 1; 264 } 265