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Diffstat (limited to 'stdio-common/printf_fphex.c')
| -rw-r--r-- | stdio-common/printf_fphex.c | 493 |
1 files changed, 493 insertions, 0 deletions
diff --git a/stdio-common/printf_fphex.c b/stdio-common/printf_fphex.c new file mode 100644 index 0000000000..4e30d94c61 --- /dev/null +++ b/stdio-common/printf_fphex.c @@ -0,0 +1,493 @@ +/* Print floating point number in hexadecimal notation according to ISO C99. + 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. + + 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 <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <wchar.h> +#include "_itoa.h" +#include "_itowa.h" +#include <locale/localeinfo.h> + +/* #define NDEBUG 1*/ /* Undefine this for debugging assertions. */ +#include <assert.h> + +/* This defines make it possible to use the same code for GNU C library and + the GNU I/O library. */ +#ifdef USE_IN_LIBIO +# include <libioP.h> +# 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 +#else /* ! USE_IN_LIBIO */ +# define PUT(f, s, n) fwrite (s, 1, n, f) +# define PAD(f, c, n) __printf_pad (f, c, n) +ssize_t __printf_pad (FILE *, char pad, int n) __THROW; /* In vfprintf.c. */ +#endif /* USE_IN_LIBIO */ + +/* 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 (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) + +#ifndef MIN +# define MIN(a,b) ((a)<(b)?(a):(b)) +#endif + + +int +__printf_fphex (FILE *fp, + const struct printf_info *info, + const void *const *args) +{ + /* The floating-point value to output. */ + union + { + union ieee754_double dbl; + union ieee854_long_double ldbl; + } + fpnum; + + /* Locale-dependent representation of decimal point. */ + const char *decimal; + wchar_t decimalwc; + + /* "NaN" or "Inf" for the special cases. */ + const char *special = NULL; + const wchar_t *wspecial = NULL; + + /* Buffer for the generated number string for the mantissa. The + maximal size for the mantissa is 128 bits. */ + char numbuf[32]; + char *numstr; + char *numend; + wchar_t wnumbuf[32]; + wchar_t *wnumstr; + wchar_t *wnumend; + int negative; + + /* The maximal exponent of two in decimal notation has 5 digits. */ + char expbuf[5]; + char *expstr; + wchar_t wexpbuf[5]; + wchar_t *wexpstr; + int expnegative; + int exponent; + + /* Non-zero is mantissa is zero. */ + int zero_mantissa; + + /* The leading digit before the decimal point. */ + char leading; + + /* Precision. */ + int precision = info->prec; + + /* Width. */ + int width = info->width; + + /* Number of characters written. */ + int done = 0; + + /* Nonzero if this is output on a wide character stream. */ + int wide = info->wide; + + + /* Figure out the decimal point character. */ + if (info->extra == 0) + { + decimal = _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT); + decimalwc = _NL_CURRENT_WORD (LC_NUMERIC, _NL_NUMERIC_DECIMAL_POINT_WC); + } + else + { + decimal = _NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT); + decimalwc = _NL_CURRENT_WORD (LC_MONETARY, + _NL_MONETARY_DECIMAL_POINT_WC); + } + /* The decimal point character must never be zero. */ + assert (*decimal != '\0' && decimalwc != L'\0'); + + + /* 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)) + { + if (isupper (info->spec)) + { + special = "NAN"; + wspecial = L"NAN"; + } + else + { + special = "nan"; + wspecial = L"nan"; + } + negative = 0; + } + else + { + if (__isinfl (fpnum.ldbl.d)) + { + if (isupper (info->spec)) + { + special = "INF"; + wspecial = L"INF"; + } + else + { + special = "inf"; + wspecial = L"inf"; + } + } + + negative = signbit (fpnum.ldbl.d); + } + } + 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)) + { + if (isupper (info->spec)) + { + special = "NAN"; + wspecial = L"NAN"; + } + else + { + special = "nan"; + wspecial = L"nan"; + } + negative = 0; + } + else + { + if (__isinf (fpnum.dbl.d)) + { + if (isupper (info->spec)) + { + special = "INF"; + wspecial = L"INF"; + } + else + { + special = "inf"; + wspecial = L"inf"; + } + } + + negative = signbit (fpnum.dbl.d); + } + } + + if (special) + { + int width = 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; + } + + if (info->is_long_double == 0 || sizeof (double) == sizeof (long double)) + { + /* We have 52 bits of mantissa plus one implicit digit. Since + 52 bits are representable without rest using hexadecimal + digits we use only the implicit digits for the number before + the decimal point. */ + unsigned long long int num; + + num = (((unsigned long long int) fpnum.dbl.ieee.mantissa0) << 32 + | fpnum.dbl.ieee.mantissa1); + + zero_mantissa = num == 0; + + if (sizeof (unsigned long int) > 6) + { + wnumstr = _itowa_word (num, wnumbuf + (sizeof wnumbuf) / sizeof (wchar_t), 16, + info->spec == 'A'); + numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, + info->spec == 'A'); + } + else + { + wnumstr = _itowa (num, wnumbuf + sizeof wnumbuf / sizeof (wchar_t), 16, + info->spec == 'A'); + numstr = _itoa (num, numbuf + sizeof numbuf, 16, + info->spec == 'A'); + } + + /* Fill with zeroes. */ + while (wnumstr > wnumbuf + (sizeof wnumbuf - 52) / sizeof (wchar_t)) + { + *--wnumstr = L'0'; + *--numstr = '0'; + } + + leading = fpnum.dbl.ieee.exponent == 0 ? '0' : '1'; + + exponent = fpnum.dbl.ieee.exponent; + + if (exponent == 0) + { + if (zero_mantissa) + expnegative = 0; + else + { + /* This is a denormalized number. */ + expnegative = 1; + exponent = IEEE754_DOUBLE_BIAS - 1; + } + } + else if (exponent >= IEEE754_DOUBLE_BIAS) + { + expnegative = 0; + exponent -= IEEE754_DOUBLE_BIAS; + } + else + { + expnegative = 1; + exponent = -(exponent - IEEE754_DOUBLE_BIAS); + } + } +#ifdef PRINT_FPHEX_LONG_DOUBLE + else + PRINT_FPHEX_LONG_DOUBLE; +#endif + + /* Look for trailing zeroes. */ + if (! zero_mantissa) + { + wnumend = &wnumbuf[sizeof wnumbuf / sizeof wnumbuf[0]]; + numend = &numbuf[sizeof numbuf / sizeof numbuf[0]]; + while (wnumend[-1] == L'0') + { + --wnumend; + --numend; + } + + if (precision == -1) + precision = numend - numstr; + else if (precision < numend - numstr + && (numstr[precision] > '8' + || (('A' < '0' || 'a' < '0') + && numstr[precision] < '0') + || (numstr[precision] == '8' + && (precision + 1 < numend - numstr + /* Round to even. */ + || (precision > 0 + && ((numstr[precision - 1] & 1) + ^ (isdigit (numstr[precision - 1]) == 0))) + || (precision == 0 + && ((leading & 1) + ^ (isdigit (leading) == 0))))))) + { + /* Round up. */ + int cnt = precision; + while (--cnt >= 0) + { + char ch = numstr[cnt]; + /* We assume that the digits and the letters are ordered + like in ASCII. This is true for the rest of GNU, too. */ + if (ch == '9') + { + wnumstr[cnt] = (wchar_t) info->spec; + numstr[cnt] = info->spec; /* This is tricky, + think about it! */ + break; + } + else if (tolower (ch) < 'f') + { + ++numstr[cnt]; + ++wnumstr[cnt]; + break; + } + else + { + numstr[cnt] = '0'; + wnumstr[cnt] = L'0'; + } + } + if (cnt < 0) + { + /* The mantissa so far was fff...f Now increment the + leading digit. Here it is again possible that we + get an overflow. */ + if (leading == '9') + leading = info->spec; + else if (tolower (leading) < 'f') + ++leading; + else + { + leading = '1'; + if (expnegative) + { + exponent -= 4; + if (exponent <= 0) + { + exponent = -exponent; + expnegative = 0; + } + } + else + exponent += 4; + } + } + } + } + else + { + if (precision == -1) + precision = 0; + numend = numstr; + wnumend = wnumstr; + } + + /* Now we can compute the exponent string. */ + expstr = _itoa_word (exponent, expbuf + sizeof expbuf, 10, 0); + wexpstr = _itowa_word (exponent, + wexpbuf + sizeof wexpbuf / sizeof (wchar_t), 10, 0); + + /* Now we have all information to compute the size. */ + width -= ((negative || info->showsign || info->space) + /* Sign. */ + + 2 + 1 + 0 + precision + 1 + 1 + /* 0x h . hhh P ExpoSign. */ + + ((expbuf + sizeof expbuf) - expstr)); + /* Exponent. */ + + /* Count the decimal point. + A special case when the mantissa or the precision is zero and the `#' + is not given. In this case we must not print the decimal point. */ + if (precision > 0 || info->alt) + width -= wide ? 1 : strlen (decimal); + + if (!info->left && info->pad != '0' && width > 0) + PADN (' ', width); + + if (negative) + outchar ('-'); + else if (info->showsign) + outchar ('+'); + else if (info->space) + outchar (' '); + + outchar ('0'); + if ('X' - 'A' == 'x' - 'a') + outchar (info->spec + ('x' - 'a')); + else + outchar (info->spec == 'A' ? 'X' : 'x'); + + if (!info->left && info->pad == '0' && width > 0) + PADN ('0', width); + + outchar (leading); + + if (precision > 0 || info->alt) + { + const wchar_t *wtmp = &decimalwc; + PRINT (decimal, wtmp, wide ? 1 : strlen (decimal)); + } + + if (precision > 0) + { + ssize_t tofill = precision - (numend - numstr); + PRINT (numstr, wnumstr, MIN (numend - numstr, precision)); + if (tofill > 0) + PADN ('0', tofill); + } + + if ('P' - 'A' == 'p' - 'a') + outchar (info->spec + ('p' - 'a')); + else + outchar (info->spec == 'A' ? 'P' : 'p'); + + outchar (expnegative ? '-' : '+'); + + PRINT (expstr, wexpstr, (expbuf + sizeof expbuf) - expstr); + + if (info->left && info->pad != '0' && width > 0) + PADN (info->pad, width); + + return done; +} |