lib/util.cc

   1 /*
   2  * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #define _etext etext
  10
  11 #include "squid.h"
  12 #include "util.h"
  13
  14 #if HAVE_STRING_H
  15 #include <string.h>
  16 #endif
  17 #if HAVE_CTYPE_H
  18 #include <ctype.h>
  19 #endif
  20 #if HAVE_UNISTD_H
  21 #include <unistd.h>
  22 #endif
  23 #if HAVE_MATH_H
  24 #include <math.h>
  25 #endif
  26
  27 void
  28 Tolower(char *q)
  29 {
  30     char *s = q;
  31
  32     while (*s) {
  33         *s = xtolower(*s);
  34         s++;
  35     }
  36 }
  37
  38 /* somewhat safer calculation of %s */
  39 double
  40 xpercent(double part, double whole)
  41 {
  42     return xdiv(100 * part, whole);
  43 }
  44
  45 int
  46 xpercentInt(double part, double whole)
  47 {
  48     return (int) rint(xpercent(part, whole));
  49 }
  50
  51 /* somewhat safer division */
  52 double
  53 xdiv(double nom, double denom)
  54 {
  55     return (denom != 0.0) ? nom / denom : -1.0;
  56 }
  57
  58 /* integer to string */
  59 const char *
  60 xitoa(int num)
  61 {
  62     static char buf[24];    /* 2^64 = 18446744073709551616 */
  63     snprintf(buf, sizeof(buf), "%d", num);
  64     return buf;
  65 }
  66
  67 /* int64_t to string */
  68 const char *
  69 xint64toa(int64_t num)
  70 {
  71     static char buf[24];    /* 2^64 = 18446744073709551616 */
  72     snprintf(buf, sizeof(buf), "%" PRId64, num);
  73     return buf;
  74 }
  75
  76 const char *
  77 double_to_str(char *buf, int buf_size, double value)
  78 {
  79     /* select format */
  80
  81     if (value < 1e9)
  82         snprintf(buf, buf_size, "%.2f MB", value / 1e6);
  83     else if (value < 1e12)
  84         snprintf(buf, buf_size, "%.3f GB", value / 1e9);
  85     else
  86         snprintf(buf, buf_size, "%.4f TB", value / 1e12);
  87
  88     return buf;
  89 }
  90