From: Pietro Gagliardi <pietro10@mac.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] Small program "PlanKey" (paraphrase of DOSKey)
Date: Fri, 23 Jan 2009 06:27:11 -0500 [thread overview]
Message-ID: <082FE5DA-8AC5-4FE8-A37C-9C8C0623A088@mac.com> (raw)
In-Reply-To: <8ccc8ba40901230250u2ddb93d7hcdb57c123a111ffa@mail.gmail.com>
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Erik modified rc directly to add a history system.
On Jan 23, 2009, at 5:50 AM, Francisco J Ballesteros wrote:
> Russ posted two script called " and "" time ago on this list,
> IIRC.
>
>
> On Fri, Jan 23, 2009 at 11:03 AM, pavel.klinkovsky@gmail.com
> <pavel.klinkovsky@gmail.com> wrote:
>> Hi all,
>>
>> In Plan9 I missed the simple way to repeat previous (or previous of
>> previous etc.) command in the terminal.
>> I prepared a very small (an stupid) program to allow that.
>>
>> Compile the following source code and run it in that way:
>> 8.out | rc -i
>>
>> You can insert the commands, and if you want to walk through the
>> "history", just press CTRL+K (backward) or CTRL+L (foreward).
>>
>> That is all, folks. ;-)
>>
>> Pavel
>>
>>
>> #include <u.h>
>> #include <libc.h>
>>
>> enum
>> {
>> KCtrlD = 0x04,
>> KCtrlK = 0x0B,
>> KCtrlL = 0x0C,
>> KDelete = 0x7F,
>>
>> MaxLen = 128,
>> MaxDepth = 10
>> };
>>
>> struct Line
>> {
>> int len;
>> char buf[MaxLen];
>> };
>> typedef struct Line Line;
>>
>> void
>> main(void)
>> {
>> // Console control file descriptor
>> int cfd;
>> // End flag
>> int end = 0;
>> // Actual read character
>> char c;
>> // Array of BackSpaces
>> char bs[MaxLen];
>> // Array of Lines
>> Line line[MaxDepth];
>> // Index of actual line
>> int act = 0;
>> // Index of stored line
>> int stored = 0;
>>
>> memset(bs, '\b', sizeof(bs));
>> memset(line, 0, sizeof(line));
>>
>> cfd = open("/dev/consctl", OWRITE);
>> if (cfd < 0)
>> sysfatal("%r");
>> write(cfd, "rawon", 5);
>>
>> while (!end) {
>> if (read(0, &c, sizeof(c)) < 0)
>> sysfatal("%r");
>>
>> switch (c) {
>> case KCtrlD:
>> case KDelete:
>> end++;
>> break;
>>
>> case '\b':
>> if (line[act].len > 0) {
>> line[act].len--;
>> write(2, &c, sizeof(c));
>> }
>> break;
>>
>> case '\n':
>> if (line[act].len > 0)
>> write(1, line[act].buf, line[act].len);
>> write(1, &c, sizeof(c));
>> write(2, &c, sizeof(c));
>> act = stored = (act + 1) % MaxDepth;
>> line[act].len = 0;
>> break;
>>
>> case KCtrlK:
>> write(2, bs, line[act].len);
>> stored = (stored + MaxDepth - 1) % MaxDepth;
>> line[act] = line[stored];
>> write(2, line[act].buf, line[act].len);
>> break;
>>
>> case KCtrlL:
>> write(2, bs, line[act].len);
>> stored = (stored + 1) % MaxDepth;
>> line[act] = line[stored];
>> write(2, line[act].buf, line[act].len);
>> break;
>>
>> case -0x11:
>> read(0, &c, sizeof(c));
>> read(0, &c, sizeof(c));
>> break;
>>
>> default:
>> if (line[act].len < MaxLen) {
>> line[act].buf[line[act].len++] = c;
>> write(2, &c, sizeof(c));
>> }
>> break;
>> }
>> }
>>
>> close(cfd);
>>
>> exits(nil);
>> }
>>
>>
>
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next prev parent reply other threads:[~2009-01-23 11:27 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-23 10:03 pavel.klinkovsky
2009-01-23 10:50 ` Francisco J Ballesteros
2009-01-23 11:27 ` Pietro Gagliardi [this message]
2009-01-23 11:35 ` Pietro Gagliardi
2009-01-23 12:56 ` roger peppe
2009-01-23 14:14 ` erik quanstrom
2009-01-26 12:41 ` cej
2009-01-26 10:31 ` pavel.klinkovsky
2009-01-27 3:29 ` Roman Shaposhnik
2009-01-27 3:42 ` erik quanstrom
2009-01-27 4:43 ` Roman Shaposhnik
2009-01-27 6:35 ` Akshat Kumar
2009-01-27 6:44 ` Akshat Kumar
2009-01-27 20:01 ` Roman V. Shaposhnik
2009-01-27 20:10 ` erik quanstrom
2009-01-27 22:01 ` Roman V. Shaposhnik
2009-01-27 22:26 ` erik quanstrom
2009-01-27 22:58 ` sqweek
2009-01-27 23:42 ` erik quanstrom
2009-01-28 0:35 ` Anthony Sorace
2009-01-28 5:59 ` lucio
2009-01-28 19:00 ` erik quanstrom
2009-01-28 22:19 ` Joel C. Salomon
2009-01-28 22:51 ` Francisco J Ballesteros
2009-01-29 0:26 ` Akshat Kumar
2009-01-29 2:09 ` erik quanstrom
2009-01-29 8:49 ` cej
2009-01-29 11:50 ` Anthony Sorace
2009-01-29 13:04 ` roger peppe
2009-01-29 13:53 ` cej
2009-01-29 16:14 ` jimmy brisson
2009-01-29 13:53 ` erik quanstrom
2009-01-29 15:20 ` Akshat Kumar
2009-01-29 16:40 ` Roman V. Shaposhnik
2009-01-29 16:52 ` erik quanstrom
2009-01-29 17:03 ` Akshat Kumar
2009-01-29 17:09 ` Brian L. Stuart
2009-01-27 7:09 ` Russ Cox
2009-01-27 22:12 ` Roman V. Shaposhnik
2009-01-27 22:25 ` Christopher Nielsen
2009-01-27 22:31 ` Roman V. Shaposhnik
2009-01-27 22:43 ` Christopher Nielsen
2009-01-27 22:50 ` Roman V. Shaposhnik
2009-01-27 23:11 ` Christopher Nielsen
2009-01-27 23:40 ` Roman V. Shaposhnik
2009-01-28 3:15 ` Christopher Nielsen
2009-01-28 7:22 ` Eris Discordia
2009-01-27 23:01 ` sqweek
2009-01-26 10:31 ` pavel.klinkovsky
2009-01-27 3:21 ` Roman Shaposhnik
2009-01-27 9:37 ` Pavel Klinkovsky
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