Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
51 lines
1.3 KiB
51 lines
1.3 KiB
16 years ago
|
#define PREFIX_START (-24)
|
||
|
|
/* Smallest power of then for which there is a prefix defined.
|
||
|
|
If the set of prefixes will be extended, change this constant
|
||
|
|
and update the table "prefix". */
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <math.h>
|
||
|
|
|
||
|
|
static char *eng(double value, int digits, int numeric)
|
||
|
|
{
|
||
|
|
static char *prefix[] = {
|
||
|
|
"y", "z", "a", "f", "p", "n", "u", "m", "",
|
||
|
|
"k", "M", "G", "T", "P", "E", "Z", "Y"
|
||
|
|
};
|
||
|
|
#define PREFIX_END (PREFIX_START+\
|
||
|
|
(int)((sizeof(prefix)/sizeof(char *)-1)*3))
|
||
|
|
|
||
|
|
int expof10;
|
||
|
|
static char result[100];
|
||
|
|
char *res = result;
|
||
|
|
|
||
|
|
if (value < 0.)
|
||
|
|
{
|
||
|
|
*res++ = '-';
|
||
|
|
value = -value;
|
||
|
|
}
|
||
|
|
|
||
|
|
expof10 = (int) log10(value);
|
||
|
|
if(expof10 > 0)
|
||
|
|
expof10 = (expof10/3)*3;
|
||
|
|
else
|
||
|
|
expof10 = (-expof10+3)/3*(-3);
|
||
|
|
|
||
|
|
value *= pow(10,-expof10);
|
||
|
|
|
||
|
|
if (value >= 1000.)
|
||
|
|
{ value /= 1000.0; expof10 += 3; }
|
||
|
|
else if(value >= 100.0)
|
||
|
|
digits -= 2;
|
||
|
|
else if(value >= 10.0)
|
||
|
|
digits -= 1;
|
||
|
|
|
||
|
|
if(numeric || (expof10 < PREFIX_START) ||
|
||
|
|
(expof10 > PREFIX_END))
|
||
|
|
sprintf(res, "%.*fe%d", digits-1, value, expof10);
|
||
|
|
else
|
||
|
|
sprintf(res, "%.*f %s", digits-1, value,
|
||
|
|
prefix[(expof10-PREFIX_START)/3]);
|
||
|
|
return result;
|
||
|
|
}
|