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author | 2021-05-09 14:20:58 -0400 | |
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committer | 2021-05-09 14:20:58 -0400 | |
commit | 5fd83771641d15c418f747bd343ba6738d3875f7 (patch) | |
tree | 5abf0f78f680d9837dbd93d4d4c3933bb7509599 /file_cmds/csh/strpct.c | |
download | apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.gz apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.zst apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.zip |
Import macOS userland
adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
Diffstat (limited to 'file_cmds/csh/strpct.c')
-rw-r--r-- | file_cmds/csh/strpct.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/file_cmds/csh/strpct.c b/file_cmds/csh/strpct.c new file mode 100644 index 0000000..ac3b32d --- /dev/null +++ b/file_cmds/csh/strpct.c @@ -0,0 +1,99 @@ +/* $NetBSD: strpct.c,v 1.2 1998/05/08 18:43:54 fair 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 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 <sys/types.h> +#include <machine/limits.h> + +#include <stdio.h> + +char * strpct __P((u_long, u_long, u_int)); + +char * +strpct(numerator, denominator, digits) + u_long numerator, denominator; + u_int digits; +{ + int i; + u_long result, factor; + static char percent[32]; + + /* I should check for digit overflow here, too XXX */ + factor = 100L; + for(i = 0; i < digits; i++) { + factor *= 10; + } + + /* watch out for overflow! */ + if (numerator < (ULONG_MAX / factor)) { + numerator *= factor; + } else { + /* toss some of the bits of lesser significance */ + denominator /= factor; + } + + if (denominator == 0L) + denominator = 1L; + + result = numerator / denominator; + + if (digits == 0) { + (void) snprintf(percent, sizeof(percent), "%lu%%", result); + } else { + char fmt[32]; + + /* indirection to produce the right output format */ + (void) snprintf(fmt, sizeof(fmt), "%%lu.%%0%ulu%%%%", digits); + + factor /= 100L; /* undo initialization */ + + (void) snprintf(percent, sizeof(percent), + fmt, result / factor, result % factor); + } + + return(percent); +} |