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237 lines
6.5 KiB
C
237 lines
6.5 KiB
C
#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#if defined(REFCLOCK) && defined(CLOCK_PARSE) && defined(CLOCK_VARITEXT)
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/*
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* clk_varitext.c,v 1.0 1997/01/19 A.McConnell
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*
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* Supports Varitext's Radio Clock
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*
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* Used the Meinberg/Computime clock as a template for Varitext Radio Clock
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*
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* Copyright (C) 1992-1996 by Frank Kardel
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* Friedrich-Alexander Universitt Erlangen-Nrnberg, Germany
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include "ntp_fp.h"
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#include "ntp_unixtime.h"
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#include "ntp_calendar.h"
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#include "parse.h"
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#ifndef PARSESTREAM
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# include "ntp_stdlib.h"
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# include <stdio.h>
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#else
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# include "sys/parsestreams.h"
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extern void printf P((const char *, ...));
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#endif
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static const u_char VT_INITIALISED = 0x01;
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static const u_char VT_SYNCHRONISED = 0x02;
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static const u_char VT_ALARM_STATE = 0x04;
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static const u_char VT_BST = 0x08;
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static const u_char VT_SEASON_CHANGE = 0x10;
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static const u_char VT_LAST_TELEGRAM_OK = 0x20;
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/*
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* The Varitext receiver sends a datagram in the following format every minute
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*
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* Timestamp T:YY:MM:MD:WD:HH:MM:SSCRLFSTXXX
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* Pos 0123456789012345678901 2 3 4567
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* 0000000000111111111122 2 2 2222
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* Parse T: : : : : : : \r\n
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*
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* T Startcharacter "T" specifies start of the timestamp
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* YY Year MM Month 1-12
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* MD Day of the month
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* WD Day of week
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* HH Hour
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* MM Minute
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* SS Second
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* CR Carriage return
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* LF Linefeed
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* ST Status character
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* Bit 0 - Set= Initialised; Reset=Time Invalid (DO NOT USE)
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* Bit 1 - Set= Synchronised; Reset= Unsynchronised
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* Bit 2 - Set= Alarm state; Reset= No alarm
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* Bit 3 - Set= BST; Reset= GMT
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* Bit 4 - Set= Seasonal change in approx hour; Reset= No seasonal change expected
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* Bit 5 - Set= Last MSF telegram was OK; Reset= Last telegram was in error;
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* Bit 6 - Always set
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* Bit 7 - Unused
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* XXX Checksum calculated using Fletcher's method (ignored for now).
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*/
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static struct format varitext_fmt =
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{
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{
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{8, 2}, {5, 2}, {2, 2}, /* day, month, year */
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{14, 2}, {17, 2}, {20, 2}, /* hour, minute, second */
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{11, 2}, {24, 1} /* dayofweek, status */
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},
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(const unsigned char*)"T: : : : : : : \r\n ",
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0
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};
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static u_long cvt_varitext P((unsigned char *, int, struct format *, clocktime_t *, void *));
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static u_long inp_varitext P((parse_t *, unsigned int, timestamp_t *));
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struct varitext {
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unsigned char start_found;
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unsigned char end_found;
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unsigned char end_count;
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unsigned char previous_ch;
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timestamp_t tstamp;
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};
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clockformat_t clock_varitext =
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{
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inp_varitext, /* Because of the strange format we need to parse it ourselves */
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cvt_varitext, /* Varitext conversion */
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0, /* no PPS monitoring */
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(void *)&varitext_fmt, /* conversion configuration */
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"Varitext Radio Clock", /* Varitext Radio Clock */
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30, /* string buffer */
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sizeof(struct varitext), /* Private data size required to hold current parse state */
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};
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/*
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* cvt_varitext
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*
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* convert simple type format
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*/
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static u_long
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cvt_varitext(
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unsigned char *buffer,
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int size,
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struct format *format,
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clocktime_t *clock_time,
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void *local
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)
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{
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if (!Strok(buffer, format->fixed_string)) {
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return CVT_NONE;
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} else {
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if (Stoi(&buffer[format->field_offsets[O_DAY].offset], &clock_time->day,
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format->field_offsets[O_DAY].length) ||
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Stoi(&buffer[format->field_offsets[O_MONTH].offset], &clock_time->month,
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format->field_offsets[O_MONTH].length) ||
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Stoi(&buffer[format->field_offsets[O_YEAR].offset], &clock_time->year,
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format->field_offsets[O_YEAR].length) ||
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Stoi(&buffer[format->field_offsets[O_HOUR].offset], &clock_time->hour,
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format->field_offsets[O_HOUR].length) ||
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Stoi(&buffer[format->field_offsets[O_MIN].offset], &clock_time->minute,
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format->field_offsets[O_MIN].length) ||
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Stoi(&buffer[format->field_offsets[O_SEC].offset], &clock_time->second,
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format->field_offsets[O_SEC].length)) {
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return CVT_FAIL | CVT_BADFMT;
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} else {
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u_char *f = (u_char*) &buffer[format->field_offsets[O_FLAGS].offset];
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clock_time->flags = 0;
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clock_time->utcoffset = 0;
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if (((*f) & VT_BST)) /* BST flag is set so set to indicate daylight saving time is active and utc offset */
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{
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clock_time->utcoffset = -1*60*60;
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clock_time->flags |= PARSEB_DST;
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}
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/*
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if (!((*f) & VT_INITIALISED)) Clock not initialised
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clock_time->flags |= PARSEB_POWERUP;
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if (!((*f) & VT_SYNCHRONISED)) Clock not synchronised
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clock_time->flags |= PARSEB_NOSYNC;
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if (((*f) & VT_SEASON_CHANGE)) Seasonal change expected in the next hour
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clock_time->flags |= PARSEB_ANNOUNCE;
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*/
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return CVT_OK;
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}
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}
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}
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static u_long
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inp_varitext(
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parse_t *parseio,
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unsigned int ch,
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timestamp_t *tstamp
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)
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{
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struct varitext *t = (struct varitext *)parseio->parse_pdata;
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int rtc;
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parseprintf(DD_PARSE, ("inp_varitext(0x%lx, 0x%x, ...)\n", (long)parseio, ch));
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if (!t)
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return PARSE_INP_SKIP; /* local data not allocated - sigh! */
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if (ch == 'T')
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t->tstamp = *tstamp;
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if ((t->previous_ch == 'T') && (ch == ':'))
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{
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parseprintf(DD_PARSE, ("inp_varitext: START seen\n"));
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parseio->parse_data[0] = 'T';
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parseio->parse_index=1;
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parseio->parse_dtime.parse_stime = t->tstamp; /* Time stamp at packet start */
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t->start_found = 1;
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t->end_found = 0;
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t->end_count = 0;
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}
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if (t->start_found)
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{
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if ((rtc = parse_addchar(parseio, ch)) != PARSE_INP_SKIP)
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{
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parseprintf(DD_PARSE, ("inp_varitext: ABORTED due to too many characters\n"));
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memset(t, 0, sizeof(struct varitext));
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return rtc;
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}
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if (t->end_found)
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{
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if (++(t->end_count) == 4) /* Finally found the end of the message */
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{
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parseprintf(DD_PARSE, ("inp_varitext: END seen\n"));
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memset(t, 0, sizeof(struct varitext));
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if ((rtc = parse_addchar(parseio, 0)) == PARSE_INP_SKIP)
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return parse_end(parseio);
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else
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return rtc;
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}
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}
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if ((t->previous_ch == '\r') && (ch == '\n'))
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{
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t->end_found = 1;
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}
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}
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t->previous_ch = ch;
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return PARSE_INP_SKIP;
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}
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#else /* not (REFCLOCK && CLOCK_PARSE && CLOCK_VARITEXT) */
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int clk_varitext_bs;
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#endif /* not (REFCLOCK && CLOCK_PARSE && CLOCK_VARITEXT) */
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/*
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* Revision 1.0 1997/06/02 13:16:30 McConnell
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* File created
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*
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*/
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