Function which can be registered to use by printf for printing numbers
authordrepper <drepper>
Sun, 23 Mar 1997 15:27:52 +0000 (15:27 +0000)
committerdrepper <drepper>
Sun, 23 Mar 1997 15:27:52 +0000 (15:27 +0000)
using the abbreviations for the orders of magnitude of numbers.

stdio-common/printf_size.c [new file with mode: 0644]

diff --git a/stdio-common/printf_size.c b/stdio-common/printf_size.c
new file mode 100644 (file)
index 0000000..0184269
--- /dev/null
@@ -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 */
+\f
+/* 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)
+\f
+/* Prototype for helper functions.  */
+extern int __printf_fp (FILE *fp, const struct printf_info *info,
+                       const void *const *args);
+
+\f
+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;
+}
+\f
+/* 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;
+}