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Correct an error in the previous revision. RAND_MAX is the maximum value

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for rand(3), not random(3).  random(3) is defined to return values between
0 and 2^31-1, so add a local RANDOM_MAX constant to this file that is
defined as 2^31-1 and use that in place of RAND_MAX.

Reviewed by:	bde
Approved by:	re (dwhite)
MFC after:	1 week
This commit is contained in:
John Baldwin 2005-06-22 15:24:00 +00:00
parent afc7f38c6b
commit 59c2bcbae9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=147530
1 changed files with 9 additions and 3 deletions
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12
games/random/random.c
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@ -62,6 +62,12 @@ __FBSDID("$FreeBSD$");
#include "randomize_fd.h" #include "randomize_fd.h"
/*
* The random() function is defined to return values between 0 and
* 2^31 - 1 inclusive in random(3).
*/
#define RANDOM_MAX 0x7fffffffL
static void usage(void); static void usage(void);
int int
@ -158,7 +164,7 @@ main(int argc, char *argv[])
/* Compute a random exit status between 0 and denom - 1. */ /* Compute a random exit status between 0 and denom - 1. */
if (random_exit) if (random_exit)
return (int)((denom * random()) / RAND_MAX); return (int)((denom * random()) / RANDOM_MAX);
/* /*
* Select whether to print the first line. (Prime the pump.) * Select whether to print the first line. (Prime the pump.)
@ -166,7 +172,7 @@ main(int argc, char *argv[])
* 0 (which has a 1 / denom chance of being true), we select the * 0 (which has a 1 / denom chance of being true), we select the
* line. * line.
*/ */
selected = (int)(denom * random() / RAND_MAX) == 0; selected = (int)(denom * random() / RANDOM_MAX) == 0;
while ((ch = getchar()) != EOF) { while ((ch = getchar()) != EOF) {
if (selected) if (selected)
(void)putchar(ch); (void)putchar(ch);
@ -176,7 +182,7 @@ main(int argc, char *argv[])
err(2, "stdout"); err(2, "stdout");
/* Now see if the next line is to be printed. */ /* Now see if the next line is to be printed. */
selected = (int)(denom * random() / RAND_MAX) == 0; selected = (int)(denom * random() / RANDOM_MAX) == 0;
} }
} }
if (ferror(stdin)) if (ferror(stdin))