#include <fcntl.h>
#include <assert.h>
#include <stdarg.h>
-#ifdef HAVE_LOCALE_H
-# include <locale.h>
-#endif
+#include <locale.h>
/* For TIOCGWINSZ and friends: */
#ifdef HAVE_SYS_IOCTL_H
grouping, which we still want to use it for legibility.
In those locales set the sep char to ',', unless that
character is used for decimal point, in which case set it
- to " ". */
+ to ".". */
if (*lconv->decimal_point != ',')
cached_sep = ",";
else
- cached_sep = " ";
+ cached_sep = ".";
cached_grouping = "\x03";
}
initialized = true;
#undef PR
#undef W
+#undef SPRINTF_WGINT
#undef DIGITS_1
#undef DIGITS_2
#undef DIGITS_3
return 0;
#endif /* neither TIOCGWINSZ nor WINDOWS */
}
+\f
+/* Whether the rnd system (either rand or [dl]rand48) has been
+ seeded. */
+static int rnd_seeded;
/* Return a random number between 0 and MAX-1, inclusive.
- If MAX is greater than the value of RAND_MAX+1 on the system, the
- returned value will be in the range [0, RAND_MAX]. This may be
- fixed in a future release.
-
+ If the system does not support lrand48 and MAX is greater than the
+ value of RAND_MAX+1 on the system, the returned value will be in
+ the range [0, RAND_MAX]. This may be fixed in a future release.
The random number generator is seeded automatically the first time
it is called.
- This uses rand() for portability. It has been suggested that
- random() offers better randomness, but this is not required for
- Wget, so I chose to go for simplicity and use rand
- unconditionally.
-
- DO NOT use this for cryptographic purposes. It is only meant to be
- used in situations where quality of the random numbers returned
- doesn't really matter. */
+ This uses lrand48 where available, rand elsewhere. DO NOT use it
+ for cryptography. It is only meant to be used in situations where
+ quality of the random numbers returned doesn't really matter. */
int
random_number (int max)
{
- static int seeded;
+#ifdef HAVE_DRAND48
+ if (!rnd_seeded)
+ {
+ srand48 ((long) time (NULL) ^ (long) getpid ());
+ rnd_seeded = 1;
+ }
+ return lrand48 () % max;
+#else /* not HAVE_DRAND48 */
+
double bounded;
int rnd;
-
- if (!seeded)
+ if (!rnd_seeded)
{
- srand (time (NULL));
- seeded = 1;
+ srand ((unsigned) time (NULL) ^ (unsigned) getpid ());
+ rnd_seeded = 1;
}
rnd = rand ();
- /* On systems that don't define RAND_MAX, assume it to be 2**15 - 1,
- and enforce that assumption by masking other bits. */
-#ifndef RAND_MAX
-# define RAND_MAX 32767
- rnd &= RAND_MAX;
-#endif
+ /* Like rand() % max, but uses the high-order bits for better
+ randomness on architectures where rand() is implemented using a
+ simple congruential generator. */
- /* This is equivalent to rand() % max, but uses the high-order bits
- for better randomness on architecture where rand() is implemented
- using a simple congruential generator. */
+ bounded = (double) max * rnd / (RAND_MAX + 1.0);
+ return (int) bounded;
- bounded = (double)max * rnd / (RAND_MAX + 1.0);
- return (int)bounded;
+#endif /* not HAVE_DRAND48 */
}
/* Return a random uniformly distributed floating point number in the
- [0, 1) range. The precision of returned numbers is 9 digits.
-
- Modify this to use erand48() where available! */
+ [0, 1) range. Uses drand48 where available, and a really lame
+ kludge elsewhere. */
double
random_float (void)
{
- /* We can't rely on any specific value of RAND_MAX, but I'm pretty
- sure it's greater than 1000. */
- int rnd1 = random_number (1000);
- int rnd2 = random_number (1000);
- int rnd3 = random_number (1000);
- return rnd1 / 1000.0 + rnd2 / 1000000.0 + rnd3 / 1000000000.0;
+#ifdef HAVE_DRAND48
+ if (!rnd_seeded)
+ {
+ srand48 ((long) time (NULL) ^ (long) getpid ());
+ rnd_seeded = 1;
+ }
+ return drand48 ();
+#else /* not HAVE_DRAND48 */
+ return ( random_number (10000) / 10000.0
+ + random_number (10000) / (10000.0 * 10000.0)
+ + random_number (10000) / (10000.0 * 10000.0 * 10000.0)
+ + random_number (10000) / (10000.0 * 10000.0 * 10000.0 * 10000.0));
+#endif /* not HAVE_DRAND48 */
}
\f
/* Implementation of run_with_timeout, a generic timeout-forcing
mergesort_internal (base, temp, size, 0, nmemb - 1, cmpfun);
}
}
+\f
+/* Print a decimal number. If it is equal to or larger than ten, the
+ number is rounded. Otherwise it is printed with one significant
+ digit without trailing zeros and with no more than three fractional
+ digits total. For example, 0.1 is printed as "0.1", 0.035 is
+ printed as "0.04", 0.0091 as "0.009", and 0.0003 as simply "0".
+
+ This is useful for displaying durations because it provides
+ order-of-magnitude information without unnecessary clutter --
+ long-running downloads are shown without the fractional part, and
+ short ones still retain one significant digit. */
+
+const char *
+print_decimal (double number)
+{
+ static char buf[32];
+ double n = number >= 0 ? number : -number;
+
+ if (n >= 9.95)
+ /* Cut off at 9.95 because the below %.1f would round 9.96 to
+ "10.0" instead of "10". OTOH 9.94 will print as "9.9". */
+ snprintf (buf, sizeof buf, "%.0f", number);
+ else if (n >= 0.95)
+ snprintf (buf, sizeof buf, "%.1f", number);
+ else if (n >= 0.001)
+ snprintf (buf, sizeof buf, "%.1g", number);
+ else if (n >= 0.0005)
+ /* round [0.0005, 0.001) to 0.001 */
+ snprintf (buf, sizeof buf, "%.3f", number);
+ else
+ /* print numbers close to 0 as 0, not 0.000 */
+ strcpy (buf, "0");
+
+ return buf;
+}
projects / wget / blobdiff