/* Print size value using units for orders of magnitude. Copyright (C) 1997-2002, 2004, 2006 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. Based on a proposal by Larry McVoy <lm@sgi.com>. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <ctype.h> #include <ieee754.h> #include <math.h> #include <printf.h> #include <libioP.h> /* This defines make it possible to use the same code for GNU C library and the GNU I/O library. */ #define PUT(f, s, n) _IO_sputn (f, s, n) #define PAD(f, c, n) (wide ? _IO_wpadn (f, c, n) : INTUSE(_IO_padn) (f, c, n)) /* We use this file GNU C library and GNU I/O library. So make names equal. */ #undef putc #define putc(c, f) (wide \ ? (int)_IO_putwc_unlocked (c, f) : _IO_putc_unlocked (c, f)) #define size_t _IO_size_t #define FILE _IO_FILE /* Macros for doing the actual output. */ #define outchar(ch) \ do \ { \ register const int outc = (ch); \ if (putc (outc, fp) == EOF) \ return -1; \ ++done; \ } while (0) #define PRINT(ptr, wptr, len) \ do \ { \ register size_t outlen = (len); \ if (len > 20) \ { \ if (PUT (fp, wide ? (const char *) wptr : ptr, outlen) != outlen) \ return -1; \ ptr += outlen; \ done += outlen; \ } \ else \ { \ if (wide) \ while (outlen-- > 0) \ outchar (*wptr++); \ else \ while (outlen-- > 0) \ outchar (*ptr++); \ } \ } while (0) #define PADN(ch, len) \ do \ { \ if (PAD (fp, ch, len) != len) \ return -1; \ done += len; \ } \ while (0) /* Prototype for helper functions. */ extern int __printf_fp (FILE *fp, const struct printf_info *info, const void *const *args); int __printf_size (FILE *fp, const struct printf_info *info, const void *const *args) { /* Units for the both formats. */ #define BINARY_UNITS " kmgtpezy" #define DECIMAL_UNITS " KMGTPEZY" static const char units[2][sizeof (BINARY_UNITS)] = { BINARY_UNITS, /* For binary format. */ DECIMAL_UNITS /* For decimal format. */ }; const char *tag = units[isupper (info->spec) != 0]; int divisor = isupper (info->spec) ? 1000 : 1024; /* The floating-point value to output. */ union { union ieee754_double dbl; union ieee854_long_double ldbl; } fpnum; const void *ptr = &fpnum; int negative = 0; /* "NaN" or "Inf" for the special cases. */ const char *special = NULL; const wchar_t *wspecial = NULL; struct printf_info fp_info; int done = 0; int wide = info->wide; /* Fetch the argument value. */ #ifndef __NO_LONG_DOUBLE_MATH if (info->is_long_double && sizeof (long double) > sizeof (double)) { fpnum.ldbl.d = *(const long double *) args[0]; /* Check for special values: not a number or infinity. */ if (__isnanl (fpnum.ldbl.d)) { special = "nan"; wspecial = L"nan"; negative = 0; } else if (__isinfl (fpnum.ldbl.d)) { special = "inf"; wspecial = L"inf"; negative = fpnum.ldbl.d < 0; } else while (fpnum.ldbl.d >= divisor && tag[1] != '\0') { fpnum.ldbl.d /= divisor; ++tag; } } else #endif /* no long double */ { fpnum.dbl.d = *(const double *) args[0]; /* Check for special values: not a number or infinity. */ if (__isnan (fpnum.dbl.d)) { special = "nan"; wspecial = L"nan"; negative = 0; } else if (__isinf (fpnum.dbl.d)) { special = "inf"; wspecial = L"inf"; negative = fpnum.dbl.d < 0; } else while (fpnum.dbl.d >= divisor && tag[1] != '\0') { fpnum.dbl.d /= divisor; ++tag; } } if (special) { int width = info->prec > info->width ? info->prec : info->width; if (negative || info->showsign || info->space) --width; width -= 3; if (!info->left && width > 0) PADN (' ', width); if (negative) outchar ('-'); else if (info->showsign) outchar ('+'); else if (info->space) outchar (' '); PRINT (special, wspecial, 3); if (info->left && width > 0) PADN (' ', width); return done; } /* Prepare to print the number. We want to use `__printf_fp' so we have to prepare a `printf_info' structure. */ fp_info = *info; fp_info.spec = 'f'; fp_info.prec = info->prec < 0 ? 3 : info->prec; fp_info.wide = wide; if (fp_info.left && fp_info.pad == L' ') { /* We must do the padding ourself since the unit character must be placed before the padding spaces. */ fp_info.width = 0; done = __printf_fp (fp, &fp_info, &ptr); if (done > 0) { outchar (*tag); if (info->width > done) PADN (' ', info->width - done); } } else { /* We can let __printf_fp do all the printing and just add our unit character afterwards. */ fp_info.width = info->width - 1; done = __printf_fp (fp, &fp_info, &ptr); if (done > 0) outchar (*tag); } return done; } ldbl_strong_alias (__printf_size, printf_size); /* This is the function used by `vfprintf' to determine number and type of the arguments. */ int printf_size_info (const struct printf_info *info, size_t n, int *argtypes) { /* We need only one double or long double argument. */ if (n >= 1) argtypes[0] = PA_DOUBLE | (info->is_long_double ? PA_FLAG_LONG_DOUBLE : 0); return 1; }