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-rw-r--r--stdio-common/printf_size.c250
1 files changed, 250 insertions, 0 deletions
diff --git a/stdio-common/printf_size.c b/stdio-common/printf_size.c
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+++ b/stdio-common/printf_size.c
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+/* 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;
+}
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