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Member "wrk-4.2.0/src/units.c" (7 Feb 2021, 2150 Bytes) of package /linux/www/wrk-4.2.0.tar.gz:

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    1 // Copyright (C) 2012 - Will Glozer.  All rights reserved.
    2 
    3 #include <stdlib.h>
    4 #include <stdio.h>
    5 #include <strings.h>
    6 #include <inttypes.h>
    7 
    8 #include "units.h"
    9 #include "aprintf.h"
   10 
   11 typedef struct {
   12     int scale;
   13     char *base;
   14     char *units[];
   15 } units;
   16 
   17 units time_units_us = {
   18     .scale = 1000,
   19     .base  = "us",
   20     .units = { "ms", "s", NULL }
   21 };
   22 
   23 units time_units_s = {
   24     .scale = 60,
   25     .base  = "s",
   26     .units = { "m", "h", NULL }
   27 };
   28 
   29 units binary_units = {
   30     .scale = 1024,
   31     .base  = "",
   32     .units = { "K", "M", "G", "T", "P", NULL }
   33 };
   34 
   35 units metric_units = {
   36     .scale = 1000,
   37     .base  = "",
   38     .units = { "k", "M", "G", "T", "P", NULL }
   39 };
   40 
   41 static char *format_units(long double n, units *m, int p) {
   42     long double amt = n, scale;
   43     char *unit = m->base;
   44     char *msg = NULL;
   45 
   46     scale = m->scale * 0.85;
   47 
   48     for (int i = 0; m->units[i+1] && amt >= scale; i++) {
   49         amt /= m->scale;
   50         unit = m->units[i];
   51     }
   52 
   53     aprintf(&msg, "%.*Lf%s", p, amt, unit);
   54 
   55     return msg;
   56 }
   57 
   58 static int scan_units(char *s, uint64_t *n, units *m) {
   59     uint64_t base, scale = 1;
   60     char unit[3] = { 0, 0, 0 };
   61     int i, c;
   62 
   63     if ((c = sscanf(s, "%"SCNu64"%2s", &base, unit)) < 1) return -1;
   64 
   65     if (c == 2 && strncasecmp(unit, m->base, 3)) {
   66         for (i = 0; m->units[i] != NULL; i++) {
   67             scale *= m->scale;
   68             if (!strncasecmp(unit, m->units[i], 3)) break;
   69         }
   70         if (m->units[i] == NULL) return -1;
   71     }
   72 
   73     *n = base * scale;
   74     return 0;
   75 }
   76 
   77 char *format_binary(long double n) {
   78     return format_units(n, &binary_units, 2);
   79 }
   80 
   81 char *format_metric(long double n) {
   82     return format_units(n, &metric_units, 2);
   83 }
   84 
   85 char *format_time_us(long double n) {
   86     units *units = &time_units_us;
   87     if (n >= 1000000.0) {
   88         n /= 1000000.0;
   89         units = &time_units_s;
   90     }
   91     return format_units(n, units, 2);
   92 }
   93 
   94 char *format_time_s(long double n) {
   95     return format_units(n, &time_units_s, 0);
   96 }
   97 
   98 int scan_metric(char *s, uint64_t *n) {
   99     return scan_units(s, n, &metric_units);
  100 }
  101 
  102 int scan_time(char *s, uint64_t *n) {
  103     return scan_units(s, n, &time_units_s);
  104 }