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[svn] Check for random.

Published in <sxs4rngh6t2.fsf@florida.arsdigita.de>.
This commit is contained in:
hniksic 2001-11-27 02:11:13 -08:00
parent bae3162c03
commit 7175ea4a12
6 changed files with 51 additions and 1 deletions

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@ -1,3 +1,7 @@
2001-11-27 Hrvoje Niksic <hniksic@arsdigita.com>
* configure.in: Check for random.
2001-11-26 Hrvoje Niksic <hniksic@arsdigita.com>
* configure.in: Check for usleep.

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@ -175,7 +175,7 @@ AC_FUNC_MMAP
AC_CHECK_FUNCS(strdup strstr strcasecmp strncasecmp strpbrk)
AC_CHECK_FUNCS(gettimeofday mktime strptime)
AC_CHECK_FUNCS(strerror snprintf vsnprintf select signal symlink access isatty)
AC_CHECK_FUNCS(uname gethostname usleep)
AC_CHECK_FUNCS(uname gethostname random usleep)
dnl
dnl Check if we need to compile in getopt.c.

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@ -1,3 +1,8 @@
2001-11-27 Hrvoje Niksic <hniksic@arsdigita.com>
* cmpt.c (random): New function, a simple-minded replacement for
random() on systems that don't have it.
2001-11-26 Hrvoje Niksic <hniksic@arsdigita.com>
* config.h.in: Put a HAVE_USLEEP stub.

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@ -1222,3 +1222,38 @@ usleep (unsigned long usec)
return 0;
}
#endif /* not HAVE_USLEEP */
#ifndef HAVE_RANDOM
/* For the systems without random: a really simple congruential RNG,
only good enough for what Wget uses it for. Before you panic: this
is not used for any kind of cryptography. */
static long random_seed;
#define RANDOM_A 9301
#define RANDOM_C 49297
#define RANDOM_M 233280
static int
random_1 (void)
{
if (!random_seed)
random_seed = time (NULL);
random_seed = (random_seed * RANDOM_A + RANDOM_C) % RANDOM_M;
return random_seed;
}
long
random (void)
{
/* Upper bits of random() are a bit more random. Compose random()
from higher bits of three call to random(). */
unsigned r1 = random_1 () >> 8;
unsigned r2 = random_1 () >> 4;
unsigned r3 = random_1 ();
long result = r1 ^ r2 ^ r3;
return result;
}
#endif /* not HAVE_RANDOM */

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@ -168,6 +168,9 @@ char *alloca ();
/* Define if you have the usleep function. */
#undef HAVE_USLEEP
/* Define if you have the random function. */
#undef HAVE_RANDOM
/* Define if you have the <string.h> header file. */
#undef HAVE_STRING_H

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@ -166,6 +166,9 @@ int vsnprintf ();
#ifndef HAVE_USLEEP
int usleep ();
#endif
#ifndef HAVE_RANDOM
long random ();
#endif
/* SunOS brain damage -- for some reason, SunOS header files fail to
declare the functions below, which causes all kinds of problems