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author | Kiyoshi Aman <kiyoshi.aman+adelie@gmail.com> | 2019-06-05 00:10:11 -0500 |
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committer | Kiyoshi Aman <kiyoshi.aman+adelie@gmail.com> | 2019-06-05 00:10:11 -0500 |
commit | 0a732af73aa7a2378e6981d3a7443e50fd291d2c (patch) | |
tree | 7b06b42159bdf69ed9c2ccca55d0d10ec09d79e1 /usr.bin/time/strpct.c | |
parent | 781dfa351934e5c0f6927456458a9f1a19442107 (diff) | |
download | userland-0a732af73aa7a2378e6981d3a7443e50fd291d2c.tar.gz userland-0a732af73aa7a2378e6981d3a7443e50fd291d2c.tar.bz2 userland-0a732af73aa7a2378e6981d3a7443e50fd291d2c.tar.xz userland-0a732af73aa7a2378e6981d3a7443e50fd291d2c.zip |
usr.bin/time: this was inappropriately pruned at some point
Diffstat (limited to 'usr.bin/time/strpct.c')
-rw-r--r-- | usr.bin/time/strpct.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/usr.bin/time/strpct.c b/usr.bin/time/strpct.c new file mode 100644 index 0000000..135fcb6 --- /dev/null +++ b/usr.bin/time/strpct.c @@ -0,0 +1,125 @@ +/* $NetBSD: strpct.c,v 1.3 2012/01/07 18:40:56 christos Exp $ */ + +/*- + * Copyright (c) 1998 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Erik E. Fair + * + * 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. + */ + +/* + * Calculate a percentage without resorting to floating point + * and return a pointer to a string + * + * "digits" is the number of digits past the decimal place you want + * (zero being the straight percentage with no decimals) + * + * Erik E. Fair <fair@clock.org>, May 8, 1997 + */ + +#include <stdint.h> +#include <locale.h> +#include <limits.h> +#include <stdio.h> +#include <errno.h> + +#include "strpct.h" + +char * +strspct(char *buf, size_t bufsiz, intmax_t numerator, intmax_t denominator, + size_t digits) +{ + int sign; + + switch (bufsiz) { + case 1: + *buf = '\0'; + /*FALLTHROUGH*/ + case 0: + return buf; + default: + break; + } + + if (denominator < 0) { + denominator = -denominator; + sign = 1; + } else + sign = 0; + + if (numerator < 0) { + numerator = -numerator; + sign++; + } + + sign &= 1; + (void)strpct(buf + sign, bufsiz - sign, (uintmax_t)numerator, + (uintmax_t)denominator, digits); + if (sign) + *buf = '-'; + return buf; +} + +char * +strpct(char *buf, size_t bufsiz, uintmax_t numerator, uintmax_t denominator, + size_t digits) +{ + uintmax_t factor, result; + size_t u; + + factor = 100; + for (u = 0; u < digits; u++) { + /* watch out for overflow! */ + if (factor < (UINTMAX_MAX / 10)) + factor *= 10; + else + break; + } + + /* watch out for overflow! */ + if (numerator < (UINTMAX_MAX / factor)) + numerator *= factor; + else { + /* toss some of the bits of lesser significance */ + denominator /= factor; + } + + if (denominator == 0) + denominator = 1; + + result = numerator / denominator; + + if (digits == 0) + (void)snprintf(buf, bufsiz, "%ju", result); + else { + factor /= 100; /* undo initialization */ + + (void)snprintf(buf, bufsiz, "%ju%s%0*ju", + result / factor, localeconv()->decimal_point, (int)u, + result % factor); + } + + return buf; +} |