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Diffstat (limited to 'REORG.TODO/stdio-common/printf_size.c')
| -rw-r--r-- | REORG.TODO/stdio-common/printf_size.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/REORG.TODO/stdio-common/printf_size.c b/REORG.TODO/stdio-common/printf_size.c new file mode 100644 index 0000000000..e20b76cf91 --- /dev/null +++ b/REORG.TODO/stdio-common/printf_size.c @@ -0,0 +1,236 @@ +/* Print size value using units for orders of magnitude. + Copyright (C) 1997-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#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) : _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 \ + { \ + const int outc = (ch); \ + if (putc (outc, fp) == EOF) \ + return -1; \ + ++done; \ + } while (0) + +#define PRINT(ptr, wptr, len) \ + do \ + { \ + 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; + long double ldbl; +#if __HAVE_DISTINCT_FLOAT128 + _Float128 f128; +#endif + } + fpnum; + const void *ptr = &fpnum; + + int is_neg = 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; + +#define PRINTF_SIZE_FETCH(FLOAT, VAR) \ + { \ + (VAR) = *(const FLOAT *) args[0]; \ + \ + /* Check for special values: not a number or infinity. */ \ + if (isnan (VAR)) \ + { \ + special = "nan"; \ + wspecial = L"nan"; \ + /* is_neg = 0; Already zero */ \ + } \ + else if (isinf (VAR)) \ + { \ + is_neg = signbit (VAR); \ + special = "inf"; \ + wspecial = L"inf"; \ + } \ + else \ + while ((VAR) >= divisor && tag[1] != '\0') \ + { \ + (VAR) /= divisor; \ + ++tag; \ + } \ + } + + /* Fetch the argument value. */ +#if __HAVE_DISTINCT_FLOAT128 + if (info->is_binary128) + PRINTF_SIZE_FETCH (_Float128, fpnum.f128) + else +#endif +#ifndef __NO_LONG_DOUBLE_MATH + if (info->is_long_double && sizeof (long double) > sizeof (double)) + PRINTF_SIZE_FETCH (long double, fpnum.ldbl) + else +#endif + PRINTF_SIZE_FETCH (double, fpnum.dbl.d) + +#undef PRINTF_SIZE_FETCH + + if (special) + { + int width = info->prec > info->width ? info->prec : info->width; + + if (is_neg || info->showsign || info->space) + --width; + width -= 3; + + if (!info->left && width > 0) + PADN (' ', width); + + if (is_neg) + 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; +} |