kc3-lang/libbsd/src/humanize_number.c

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• Hash : acb577d6
  Author :
  Date : 2008-06-13T05:25:57
  

  Sync humanize_number from NetBSD Add the missing man page.

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• src/humanize_number.c

• /*	$NetBSD: humanize_number.c,v 1.14 2008/04/28 20:22:59 martin Exp $	*/
  
  /*
   * Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
   * All rights reserved.
   *
   * This code is derived from software contributed to The NetBSD Foundation
   * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   * NASA Ames Research Center, by Luke Mewburn and by Tomas Svensson.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  #include <assert.h>
  #include <inttypes.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <locale.h>
  #include <libutil.h>
  
  int
  humanize_number(char *buf, size_t len, int64_t bytes,
      const char *suffix, int scale, int flags)
  {
  	const char *prefixes, *sep;
  	int	b, i, r, maxscale, s1, s2, sign;
  	int64_t	divisor, max;
  	size_t	baselen;
  
  	assert(buf != NULL);
  	assert(suffix != NULL);
  	assert(scale >= 0);
  
  	if (flags & HN_DIVISOR_1000) {
  		/* SI for decimal multiplies */
  		divisor = 1000;
  		if (flags & HN_B)
  			prefixes = "B\0k\0M\0G\0T\0P\0E";
  		else
  			prefixes = "\0\0k\0M\0G\0T\0P\0E";
  	} else {
  		/*
  		 * binary multiplies
  		 * XXX IEC 60027-2 recommends Ki, Mi, Gi...
  		 */
  		divisor = 1024;
  		if (flags & HN_B)
  			prefixes = "B\0K\0M\0G\0T\0P\0E";
  		else
  			prefixes = "\0\0K\0M\0G\0T\0P\0E";
  	}
  
  #define	SCALE2PREFIX(scale)	(&prefixes[(scale) << 1])
  	maxscale = 7;
  
  	if (scale >= maxscale &&
  	    (scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0)
  		return (-1);
  
  	if (buf == NULL || suffix == NULL)
  		return (-1);
  
  	if (len > 0)
  		buf[0] = '\0';
  	if (bytes < 0) {
  		sign = -1;
  		bytes *= -100;
  		baselen = 3;		/* sign, digit, prefix */
  	} else {
  		sign = 1;
  		bytes *= 100;
  		baselen = 2;		/* digit, prefix */
  	}
  	if (flags & HN_NOSPACE)
  		sep = "";
  	else {
  		sep = " ";
  		baselen++;
  	}
  	baselen += strlen(suffix);
  
  	/* Check if enough room for `x y' + suffix + `\0' */
  	if (len < baselen + 1)
  		return (-1);
  
  	if (scale & (HN_AUTOSCALE | HN_GETSCALE)) {
  		/* See if there is additional columns can be used. */
  		for (max = 100, i = len - baselen; i-- > 0;)
  			max *= 10;
  
  		/*
  		 * Divide the number until it fits the given column.
  		 * If there will be an overflow by the rounding below,
  		 * divide once more.
  		 */
  		for (i = 0; bytes >= max - 50 && i < maxscale; i++)
  			bytes /= divisor;
  
  		if (scale & HN_GETSCALE)
  			return (i);
  	} else
  		for (i = 0; i < scale && i < maxscale; i++)
  			bytes /= divisor;
  
  	/* If a value <= 9.9 after rounding and ... */
  	if (bytes < 995 && i > 0 && flags & HN_DECIMAL) {
  		/* baselen + \0 + .N */
  		if (len < baselen + 1 + 2)
  			return (-1);
  		b = ((int)bytes + 5) / 10;
  		s1 = b / 10;
  		s2 = b % 10;
  		r = snprintf(buf, len, "%d%s%d%s%s%s",
  		    sign * s1, localeconv()->decimal_point, s2,
  		    sep, SCALE2PREFIX(i), suffix);
  	} else
  		r = snprintf(buf, len, "%" PRId64 "%s%s%s",
  		    sign * ((bytes + 50) / 100),
  		    sep, SCALE2PREFIX(i), suffix);
  
  	return (r);
  }
  

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