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Add approximate scaled format functions

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Used to produce human-readable values in logs, reports etc.
Eg: 1,073,741,824 -> "1.07g" (SI) and "1.00G" (binary).
This commit is contained in:
Andrew Bettison 2016-09-20 15:46:17 +09:30
parent cea2221f47
commit d9c9d465df
2 changed files with 49 additions and 0 deletions
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29
numeric_str.c
View File

@ -304,3 +304,32 @@ int str_to_uint64_interval_ms(const char *str, int64_t *result, const char **aft
return 1;
}
strbuf strbuf_append_double_scaled_binary(strbuf sb, double value)
{
const char *suffix = " KMGTP";
while (value >= 1024 && suffix[1]){
value = value / 1024;
suffix++;
}
int precision = value < 10 ? 2 : value < 100 ? 1 : 0;
strbuf_sprintf(sb, "%.*f", precision, value);
if (*suffix && *suffix != ' ') {
strbuf_putc(sb, *suffix);
}
return sb;
}
strbuf strbuf_append_double_scaled_si(strbuf sb, double value)
{
const char *suffix = " kmgtp";
while (value >= 1000 && suffix[1]){
value = value / 1000;
suffix++;
}
int precision = value < 10 ? 2 : value < 100 ? 1 : 0;
strbuf_sprintf(sb, "%.*f", precision, value);
if (*suffix && *suffix != ' ') {
strbuf_putc(sb, *suffix);
}
return sb;
}

20
numeric_str.h
View File

@ -107,6 +107,26 @@ uint64_t scale_factor(const char *str, const char **afterp);
strbuf strbuf_append_uint32_scaled(strbuf sb, uint32_t value);
strbuf strbuf_append_uint64_scaled(strbuf sb, uint64_t value);
/* Append a double value to a strbuf in ASCII decimal fixed-point format with three significant
* digits, optionally scaled with either a binary scale suffix in the set {KMGTP}: 'K' = 1<<10, 'M'
* = 1<<20, 'G' = * 1<<30, etc., or an S.I. scale suffix in the set {kmgtp}: 'k' = 1e3, 'm' = 1e6,
* etc. This format is lossy because it always applies the scale, which may truncate insignificant
* digits.
*
* Eg, binary S.I.
* 1000 -> "1000" 1000 -> "1.00k"
* 1001 -> "1001" 1001 -> "1.00k"
* 1024 -> "1.00K" 1024 -> "1.02k"
* 1025 -> "1.00K" 1025 -> "1.03k"
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
strbuf strbuf_append_double_scaled_binary(strbuf sb, double value);
strbuf strbuf_append_double_scaled_si(strbuf sb, double value);
#define alloca_double_scaled_binary(v) strbuf_str(strbuf_append_double_scaled_binary(strbuf_alloca(10), (v)))
#define alloca_double_scaled_si(v) strbuf_str(strbuf_append_double_scaled_si(strbuf_alloca(10), (v)))
/* Parse a string as a time interval (seconds) in millisecond resolution. Return the number of
* milliseconds. Valid strings are all unsigned ASCII decimal numbers with up to three digits after
* the decimal point.