6ca409e0e4
trylink: explain how to modify link and drastically decrease amount of padding (unfortunately, needs hand editing ATM). *: add ALIGN1 / ALIGN2 to global strings and arrays of bytes and shorts size saving: 0.5k
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* June 30, 2001 Manuel Novoa III
|
|
*
|
|
* All-integer version (hey, not everyone has floating point) of
|
|
* make_human_readable_str, modified from similar code I had written
|
|
* for busybox several months ago.
|
|
*
|
|
* Notes:
|
|
* 1) I'm using an unsigned long long to hold the product size * block_size,
|
|
* as df (which calls this routine) could request a representation of a
|
|
* partition size in bytes > max of unsigned long. If long longs aren't
|
|
* available, it would be possible to do what's needed using polynomial
|
|
* representations (say, powers of 1024) and manipulating coefficients.
|
|
* The base ten "bytes" output could be handled similarly.
|
|
*
|
|
* 2) This routine always outputs a decimal point and a tenths digit when
|
|
* display_unit != 0. Hence, it isn't uncommon for the returned string
|
|
* to have a length of 5 or 6.
|
|
*
|
|
* It might be nice to add a flag to indicate no decimal digits in
|
|
* that case. This could be either an additional parameter, or a
|
|
* special value of display_unit. Such a flag would also be nice for du.
|
|
*
|
|
* Some code to omit the decimal point and tenths digit is sketched out
|
|
* and "#if 0"'d below.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
|
|
const char *make_human_readable_str(unsigned long long size,
|
|
unsigned long block_size, unsigned long display_unit)
|
|
{
|
|
/* The code will adjust for additional (appended) units */
|
|
static const char zero_and_units[] ALIGN1 = { '0', 0, 'k', 'M', 'G', 'T' };
|
|
static const char fmt[] ALIGN1 = "%llu";
|
|
static const char fmt_tenths[] ALIGN1 = "%llu.%d%c";
|
|
|
|
static char str[21] ALIGN1; /* Sufficient for 64 bit unsigned integers */
|
|
|
|
unsigned long long val;
|
|
int frac;
|
|
const char *u;
|
|
const char *f;
|
|
|
|
u = zero_and_units;
|
|
f = fmt;
|
|
frac = 0;
|
|
|
|
val = size * block_size;
|
|
if (val == 0) {
|
|
return u;
|
|
}
|
|
|
|
if (display_unit) {
|
|
val += display_unit/2; /* Deal with rounding */
|
|
val /= display_unit; /* Don't combine with the line above!!! */
|
|
} else {
|
|
++u;
|
|
while ((val >= 1024)
|
|
&& (u < zero_and_units + sizeof(zero_and_units) - 1)
|
|
) {
|
|
f = fmt_tenths;
|
|
++u;
|
|
frac = (((int)(val % 1024)) * 10 + 1024/2) / 1024;
|
|
val /= 1024;
|
|
}
|
|
if (frac >= 10) { /* We need to round up here. */
|
|
++val;
|
|
frac = 0;
|
|
}
|
|
#if 0
|
|
/* Sample code to omit decimal point and tenths digit. */
|
|
if (/* no_tenths */ 1) {
|
|
if (frac >= 5) {
|
|
++val;
|
|
}
|
|
f = "%llu%*c" /* fmt_no_tenths */;
|
|
frac = 1;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* If f==fmt then 'frac' and 'u' are ignored. */
|
|
snprintf(str, sizeof(str), f, val, frac, *u);
|
|
|
|
return str;
|
|
}
|