mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-11-16 00:15:08 +01:00
67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
|
/*
|
||
|
|
* percent.c - Take percentage of a number
|
||
|
|
*
|
||
|
|
* Copyright (C) 2006 Theodore Ts'o <tytso@mit.edu>
|
||
|
|
*
|
||
|
|
* %Begin-Header%
|
||
|
|
* This file may be redistributed under the terms of the GNU Library
|
||
|
|
* General Public License, version 2.
|
||
|
|
* %End-Header%
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "e2p.h"
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We work really hard to calculate this accurately, while avoiding
|
||
|
|
* an overflow. "Is there a hyphen in anal-retentive?" :-)
|
||
|
|
*/
|
||
|
|
unsigned int e2p_percent(int percent, unsigned int base)
|
||
|
|
{
|
||
|
|
unsigned int mask = ~((1 << (sizeof(unsigned int) - 1) * 8) - 1);
|
||
|
|
|
||
|
|
if (!percent)
|
||
|
|
return 0;
|
||
|
|
if (100 % percent == 0)
|
||
|
|
return base / (100 / percent);
|
||
|
|
if (mask & base)
|
||
|
|
return (base / 100) * percent;
|
||
|
|
return base * percent / 100;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef DEBUG
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
unsigned int base;
|
||
|
|
int percent;
|
||
|
|
char *p;
|
||
|
|
int log_block_size = 0;
|
||
|
|
|
||
|
|
if (argc != 3) {
|
||
|
|
fprintf(stderr, "Usage: %s percent base\n", argv[0]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
percent = strtoul(argv[1], &p, 0);
|
||
|
|
if (p[0] && p[1]) {
|
||
|
|
fprintf(stderr, "Bad percent: %s\n", argv[1]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
base = strtoul(argv[2], &p, 0);
|
||
|
|
if (p[0] && p[1]) {
|
||
|
|
fprintf(stderr, "Bad base: %s\n", argv[2]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
printf("%d percent of %u is %u.\n", percent, base,
|
||
|
|
e2p_percent(percent, base));
|
||
|
|
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
#endif
|