diff options
Diffstat (limited to 'toolbox/upstream-netbsd/lib/libc/gen/humanize_number.c')
| -rw-r--r-- | toolbox/upstream-netbsd/lib/libc/gen/humanize_number.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/toolbox/upstream-netbsd/lib/libc/gen/humanize_number.c b/toolbox/upstream-netbsd/lib/libc/gen/humanize_number.c new file mode 100644 index 0000000..533560f --- /dev/null +++ b/toolbox/upstream-netbsd/lib/libc/gen/humanize_number.c @@ -0,0 +1,161 @@ +/* $NetBSD: humanize_number.c,v 1.16 2012/03/17 20:01:14 christos 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> +#if defined(LIBC_SCCS) && !defined(lint) +__RCSID("$NetBSD: humanize_number.c,v 1.16 2012/03/17 20:01:14 christos Exp $"); +#endif /* LIBC_SCCS and not lint */ + +#include "namespace.h" +#include <assert.h> +#include <inttypes.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <locale.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, r, s1, s2, sign; + int64_t divisor, max, post = 1; + size_t i, baselen, maxscale; + + _DIAGASSERT(buf != NULL); + _DIAGASSERT(suffix != NULL); + _DIAGASSERT(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 ((size_t)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; + baselen = 3; /* sign, digit, prefix */ + if (-bytes < INT64_MAX / 100) + bytes *= -100; + else { + bytes = -bytes; + post = 100; + baselen += 2; + } + } else { + sign = 1; + baselen = 2; /* digit, prefix */ + if (bytes < INT64_MAX / 100) + bytes *= 100; + else { + post = 100; + baselen += 2; + } + } + 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) { + _DIAGASSERT(__type_fit(int, i)); + return (int)i; + } + } else + for (i = 0; i < (size_t)scale && i < maxscale; i++) + bytes /= divisor; + bytes *= post; + + /* 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); +} |