Date: Wed, 1 Dec 1999 13:28:13 +0100 (CET) From: dalroi@wit401310.student.utwente.nl To: FreeBSD-gnats-submit@freebsd.org Subject: misc/15205: Addition to /usr/games/random Message-ID: <19991201122813.D48BA1EE3@wit401310.student.utwente.nl>
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>Number: 15205
>Category: misc
>Synopsis: Addition to /usr/games/random
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Wed Dec 1 05:40:02 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Alban Hertroys
>Release: FreeBSD 3.3-STABLE i386
>Organization:
>Environment:
FreeBSD 3.3-STABLE, i386
>Description:
The random command is not capable of what one would suspect it
to do: printing one random line out of it's input.
It can do so with numbers (random -e <denominator>), but not with lines
of input.
>How-To-Repeat:
not applicable
>Fix:
The following patch adds the '-s' option to random, which prints one
random line out of every <denominator> lines of input.
Thus, "ls /bin | random -s 8" would result in, for example:
chmod
domainname
pax
stty
(ls /bin results in 32 files on my system; 32/8 = 4 results)
And "ls /bin | random -s $#" (invoked from a shell script) would result in one
line from ls /bin.
I use this for my random signature selector script. I suppose it has other
uses.
diff -c games/random.orig/random.6 games/random/random.6
*** games/random.orig/random.6 Mon Nov 29 20:09:59 1999
--- games/random/random.6 Mon Nov 29 20:09:01 1999
***************
*** 39,45 ****
.Nd random lines from a file or random numbers
.Sh SYNOPSIS
.Nm random
! .Op Fl er
.Op Ar denominator
.Sh DESCRIPTION
.Nm Random
--- 39,45 ----
.Nd random lines from a file or random numbers
.Sh SYNOPSIS
.Nm random
! .Op Fl esr
.Op Ar denominator
.Sh DESCRIPTION
.Nm Random
***************
*** 60,65 ****
--- 60,73 ----
exit value of 0 to
.Ar denominator
\&- 1, inclusive.
+ .It Fl s
+ If the
+ .Fl s
+ option is specified,
+ .Nm random
+ copies one random line out of every
+ .Ar denominator
+ lines to stdout, instead.
.It Fl r
The
.Fl r
diff -c games/random.orig/random.c games/random/random.c
*** games/random.orig/random.c Mon Nov 29 19:26:29 1999
--- games/random/random.c Mon Nov 29 20:03:20 1999
***************
*** 63,73 ****
{
extern int optind;
double denom;
! int ch, random_exit, selected, unbuffer_output;
char *ep;
! random_exit = unbuffer_output = 0;
! while ((ch = getopt(argc, argv, "er")) != -1)
switch (ch) {
case 'e':
random_exit = 1;
--- 63,73 ----
{
extern int optind;
double denom;
! int ch, random_exit, selected, unbuffer_output, random_select, index;
char *ep;
! random_exit = unbuffer_output = random_select = 0;
! while ((ch = getopt(argc, argv, "esr")) != -1)
switch (ch) {
case 'e':
random_exit = 1;
***************
*** 75,80 ****
--- 75,83 ----
case 'r':
unbuffer_output = 1;
break;
+ case 's':
+ random_select = 1;
+ break;
default:
case '?':
usage();
***************
*** 116,138 ****
if (unbuffer_output)
setbuf(stdout, NULL);
/*
* Select whether to print the first line. (Prime the pump.)
* We find a random number between 0 and denom - 1 and, if it's
* 0 (which has a 1 / denom chance of being true), we select the
* line.
*/
! selected = (int)(denom * random() / LONG_MAX) == 0;
! while ((ch = getchar()) != EOF) {
! if (selected)
! (void)putchar(ch);
! if (ch == '\n') {
! /* End of that line. See if we got an error. */
! if (ferror(stdout))
! err(2, "stdout");
!
! /* Now see if the next line is to be printed. */
! selected = (int)(denom * random() / LONG_MAX) == 0;
}
}
if (ferror(stdin))
--- 119,164 ----
if (unbuffer_output)
setbuf(stdout, NULL);
+ if (random_select == 0) {
/*
* Select whether to print the first line. (Prime the pump.)
* We find a random number between 0 and denom - 1 and, if it's
* 0 (which has a 1 / denom chance of being true), we select the
* line.
*/
! selected = (int)(denom * random() / LONG_MAX) == 0;
! while ((ch = getchar()) != EOF) {
! if (selected)
! (void)putchar(ch);
! if (ch == '\n') {
! /* End of that line. See if we got an error. */
! if (ferror(stdout))
! err(2, "stdout");
!
! /* Now see if the next line is to be printed. */
! selected = (int)(denom * random() / LONG_MAX) == 0;
! }
! }
! } else {
! /*
! * Print one random line out of every denom lines.
! */
! selected = (int)(denom * random() / LONG_MAX);
! index = 0;
! while ((ch = getchar()) != EOF) {
! if (selected == index)
! (void)putchar(ch);
! if (ch == '\n') {
! /* End of that line. See if we got an error. */
! if (ferror(stdout))
! err(2,"stdout");
!
! index++;
! if (index >= denom) {
! index = 0;
! selected = (int)(denom * random() / LONG_MAX);
! }
! }
}
}
if (ferror(stdin))
***************
*** 144,149 ****
usage()
{
! (void)fprintf(stderr, "usage: random [-er] [denominator]\n");
exit(1);
}
--- 170,175 ----
usage()
{
! (void)fprintf(stderr, "usage: random [-esr] [denominator]\n");
exit(1);
}
>Release-Note:
>Audit-Trail:
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