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Diffstat (limited to 'stdio-common/printf_size.c')
| -rw-r--r-- | stdio-common/printf_size.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/stdio-common/printf_size.c b/stdio-common/printf_size.c new file mode 100644 index 0000000000..0184269181 --- /dev/null +++ b/stdio-common/printf_size.c @@ -0,0 +1,250 @@ +/* Print size value using units for orders of magnitude. + Copyright (C) 1997 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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> +#ifdef USE_IN_LIBIO +# include <libioP.h> +#else +# include <stdio.h> +#endif + + +/* This defines make it possible to use the same code for GNU C library and + the GNU I/O library. */ +#ifdef USE_IN_LIBIO +# define PUT(f, s, n) _IO_sputn (f, s, n) +# define PAD(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) _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 __P ((FILE *, char pad, int n)); /* 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, len) \ + do \ + { \ + register size_t outlen = (len); \ + if (len > 20) \ + { \ + if (PUT (fp, ptr, outlen) != outlen) \ + return -1; \ + ptr += outlen; \ + done += outlen; \ + } \ + 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. */ + static const char units[2][8] = + { + " kmgtps", /* For binary format. */ + " KMGTPS" /* 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; + + struct printf_info fp_info; + int done = 0; + + + /* Fetch the argument value. */ + 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"; + negative = 0; + } + else if (__isinfl (fpnum.ldbl.d)) + { + special = "inf"; + + negative = fpnum.ldbl.d < 0; + } + else + while (fpnum.ldbl.d >= divisor && tag[1] != '\0') + { + fpnum.ldbl.d /= divisor; + ++tag; + } + } + else + { + fpnum.dbl.d = *(const double *) args[0]; + + /* Check for special values: not a number or infinity. */ + if (__isnan (fpnum.dbl.d)) + { + special = "nan"; + negative = 0; + } + else if (__isinf (fpnum.dbl.d)) + { + special = "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, 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.spec = 'f'; + fp_info.prec = info->prec < 0 ? 3 : info->prec; + fp_info.is_long_double = info->is_long_double; + fp_info.is_short = info->is_short; + fp_info.is_long = info->is_long; + fp_info.alt = info->alt; + fp_info.space = info->space; + fp_info.left = info->left; + fp_info.showsign = info->showsign; + fp_info.group = info->group; + fp_info.extra = info->extra; + fp_info.pad = info->pad; + + 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; +} + +/* 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; +} |