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MINOR: tools: add print_time_short() to print a condensed duration value

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When reporting some values in debugging output we often need to have
some condensed, stable-length values. This function prints a duration
from nanosecond to years with at least 4 digits of accuracy using the
most suitable unit, always on 7 chars.
This commit is contained in:
Willy Tarreau 2021-01-29 10:47:52 +01:00
parent 87ef323971
commit 4deeb1055f
2 changed files with 39 additions and 0 deletions
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1
include/haproxy/tools.h
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@ -790,6 +790,7 @@ int parse_http_date(const char *date, int len, struct tm *tm);
int parse_imf_date(const char *date, int len, struct tm *tm);
int parse_rfc850_date(const char *date, int len, struct tm *tm);
int parse_asctime_date(const char *date, int len, struct tm *tm);
int print_time_short(struct buffer *out, const char *pfx, uint64_t ns, const char *sfx);
/* Dynamically allocates a string of the proper length to hold the formatted
* output. NULL is returned on error. The caller is responsible for freeing the

38
src/tools.c
View file

@ -3817,6 +3817,44 @@ int parse_http_date(const char *date, int len, struct tm *tm)
return 0;
}
/* print the time <ns> in a short form (exactly 7 chars) at the end of buffer
* <out>. "-" is printed if the value is zero, "inf" if larger than 1000 years.
* It returns the new buffer length, or 0 if it doesn't fit. The value will be
* surrounded by <pfx> and <sfx> respectively if not NULL.
*/
int print_time_short(struct buffer *out, const char *pfx, uint64_t ns, const char *sfx)
{
double val = ns; // 52 bits of mantissa keep ns accuracy over 52 days
const char *unit;
if (!pfx)
pfx = "";
if (!sfx)
sfx = "";
do {
unit = " - "; if (val <= 0.0) break;
unit = "ns"; if (val < 1000.0) break;
unit = "us"; val /= 1000.0; if (val < 1000.0) break;
unit = "ms"; val /= 1000.0; if (val < 1000.0) break;
unit = "s "; val /= 1000.0; if (val < 60.0) break;
unit = "m "; val /= 60.0; if (val < 60.0) break;
unit = "h "; val /= 60.0; if (val < 24.0) break;
unit = "d "; val /= 24.0; if (val < 365.0) break;
unit = "yr"; val /= 365.0; if (val < 1000.0) break;
unit = " inf "; val = 0.0; break;
} while (0);
if (val <= 0.0)
return chunk_appendf(out, "%s%7s%s", pfx, unit, sfx);
else if (val < 10.0)
return chunk_appendf(out, "%s%1.3f%s%s", pfx, val, unit, sfx);
else if (val < 100.0)
return chunk_appendf(out, "%s%2.2f%s%s", pfx, val, unit, sfx);
else
return chunk_appendf(out, "%s%3.1f%s%s", pfx, val, unit, sfx);
}
/* Dynamically allocates a string of the proper length to hold the formatted
* output. NULL is returned on error. The caller is responsible for freeing the
* memory area using free(). The resulting string is returned in <out> if the