source: buchla-68k/orig/DATE/DATE.C@ 0170798

Last change on this file since 0170798 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Imported original source code.
  • Property mode set to 100755
File size: 6.1 KB
RevLine 
[3ae31e9]1/*
2 =============================================================================
3 date.c -- date - with format capabilities
4 Version 1 -- 1988-01-14
5 =============================================================================
6*/
7
8#include "types.h"
9#include "utmp.h"
10#include "stdio.h"
11#include "time.h"
12
13#define MONTH itoa(tim->tm_mon+1, cp,2)
14#define DAY itoa(tim->tm_mday, cp, 2)
15#define YEAR itoa(tim->tm_year, cp, 2)
16#define HOUR itoa(tim->tm_hour, cp, 2)
17#define MINUTE itoa(tim->tm_min, cp, 2)
18#define SECOND itoa(tim->tm_sec, cp, 2)
19#define JULIAN itoa(tim->tm_yday+1, cp, 3)
20#define WEEKDAY itoa(tim->tm_wday, cp, 1)
21#define MODHOUR itoa(h, cp, 2)
22#define dysize(A) (((A) % 4) ? 365 : 366)
23
24int dmsize[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
25
26char month[12][3] = {
27
28 "Jan","Feb","Mar","Apr",
29 "May","Jun","Jul","Aug",
30 "Sep","Oct","Nov","Dec"
31};
32
33char days[7][3] = {
34
35 "Sun","Mon","Tue","Wed",
36 "Thu","Fri","Sat"
37};
38
39char *itoa();
40char *cbp;
41long timbuf;
42
43struct utmp wtmp[2] = {
44
45 {"", "", OTIME_MSG, 0, OLD_TIME, 0, 0, 0},
46 {"", "", NTIME_MSG, 0, NEW_TIME, 0, 0, 0}
47};
48
49/*
50 =============================================================================
51 gpair() -- get 2 digits
52 =============================================================================
53*/
54
55int
56gpair()
57{
58 register int c, d;
59 register char *cp;
60
61 cp = cbp;
62
63 if(*cp == 0)
64 return(-1);
65
66 c = (*cp++ - '0') * 10;
67
68 if (c<0 || c>100)
69 return(-1);
70
71 if(*cp == 0)
72 return(-1);
73
74 if ((d = *cp++ - '0') < 0 || d > 9)
75 return(-1);
76
77 cbp = cp;
78
79 return (c+d);
80}
81
82/*
83 */
84
85/*
86 =============================================================================
87 gtime() -- get time
88 =============================================================================
89*/
90
91int
92gtime()
93{
94 register int i;
95 register int y, t;
96 int d, h, m;
97 long nt;
98
99 tzset();
100
101 t = gpair();
102
103 if (t < 1 OR t > 12)
104 return(1);
105
106 d = gpair();
107
108 if(d < 1 OR d > 31)
109 return(1);
110
111 h = gpair();
112
113 if (h EQ 24) {
114
115 h = 0;
116 d++;
117 }
118
119 m = gpair();
120
121 if (m < 0 OR m > 59)
122 return(1);
123
124 y = gpair();
125
126 if (y < 0) {
127
128 (void) time(&nt);
129 y = localtime(&nt)->tm_year;
130 }
131
132 if (*cbp EQ 'p')
133 h += 12;
134
135 if (h < 0 OR h > 23)
136 return(1);
137
138 timbuf = 0;
139 y += 1900;
140
141 for(i = 1970; i < y; i++)
142 timbuf += dysize(i);
143
144 /* Leap year */
145
146 if (dysize(y) EQ 366 AND t GE 3)
147 timbuf += 1;
148
149 while (--t)
150 timbuf += dmsize[t - 1];
151
152 timbuf += (d - 1);
153 timbuf *= 24;
154 timbuf += h;
155 timbuf *= 60;
156 timbuf += m;
157 timbuf *= 60;
158
159 return(0);
160}
161
162/*
163 */
164
165/*
166 =============================================================================
167 itoa(i,ptr,dig)
168 =============================================================================
169*/
170
171char *
172itoa(i, ptr, dig)
173register int i;
174register char *ptr;
175register int dig;
176{
177 switch(dig) {
178
179 case 3:
180 *ptr++ = i/100 + '0';
181 i = i - i / 100 * 100;
182
183 case 2:
184 *ptr++ = i / 10 + '0';
185
186 case 1:
187 *ptr++ = i % 10 + '0';
188 }
189
190 return(ptr);
191}
192
193/*
194 */
195
196main(argc, argv)
197int argc;
198int **argv;
199{
200 register char *aptr, *cp, c;
201 int h, hflag, i, tfailed, wf;
202 long tbuf, time(), lseek();
203 struct tm *tim;
204 char buf[200], *tzn;
205
206 tfailed = 0;
207
208 if(argc > 1) {
209
210 cbp = (char *)argv[1];
211
212 if(*cbp == '+') {
213
214 hflag = 0;
215
216 for(cp=buf;cp< &buf[200];)
217 *cp++ = '\0';
218
219 (void) time(&tbuf);
220 tim = localtime(&tbuf);
221 aptr = (char *)argv[1];
222 aptr++;
223 cp = buf;
224
225 while(c = *aptr++) {
226
227 if(c == '%')
228 switch(*aptr++) {
229
230 case '%':
231 *cp++ = '%';
232 continue;
233
234 case 'n':
235 *cp++ = '\n';
236 continue;
237
238 case 't':
239 *cp++ = '\t';
240 continue;
241
242 case 'm' :
243 cp = MONTH;
244 continue;
245
246 case 'd':
247 cp = DAY;
248 continue;
249
250 case 'y' :
251 cp = YEAR;
252 continue;
253
254 case 'D':
255 cp = MONTH;
256 *cp++ = '/';
257 cp = DAY;
258 *cp++ = '/';
259 cp = YEAR;
260 continue;
261
262 case 'H':
263 cp = HOUR;
264 continue;
265
266 case 'M':
267 cp = MINUTE;
268 continue;
269
270 case 'S':
271 cp = SECOND;
272 continue;
273
274 case 'T':
275 cp = HOUR;
276 *cp++ = ':';
277 cp = MINUTE;
278 *cp++ = ':';
279 cp = SECOND;
280 continue;
281
282 case 'j':
283 cp = JULIAN;
284 continue;
285
286 case 'w':
287 cp = WEEKDAY;
288 continue;
289
290 case 'r':
291 if((h = tim->tm_hour) >= 12)
292 hflag++;
293
294 if((h %= 12) == 0)
295 h = 12;
296
297 cp = MODHOUR;
298 *cp++ = ':';
299 cp = MINUTE;
300 *cp++ = ':';
301 cp = SECOND;
302 *cp++ = ' ';
303
304 if(hflag)
305 *cp++ = 'P';
306 else
307 *cp++ = 'A';
308
309 *cp++ = 'M';
310 continue;
311
312 case 'h':
313 for(i=0; i<3; i++)
314 *cp++ = month[tim->tm_mon][i];
315 continue;
316
317 case 'a':
318 for(i=0; i<3; i++)
319 *cp++ = days[tim->tm_wday][i];
320 continue;
321
322 default:
323 (void) fprintf(stderr, "date: bad format character - %c\n", *--aptr);
324 exit(2);
325 } /* endsw */
326
327 *cp++ = c;
328
329 } /* endwh */
330
331 *cp = '\n';
332 (void) write(1,buf,(cp - &buf[0]) + 1);
333 exit(0);
334 }
335
336 if(*cbp == '-') {
337
338 (void) fprintf(stderr,"date: no TOY clock\n");
339 exit(2);
340 }
341
342 if(gtime()) {
343
344 (void) fprintf(stderr,"date: bad conversion\n");
345 exit(2);
346 }
347
348 /* convert to Greenwich time, on assumption of Standard time. */
349
350 timbuf += timezone;
351
352 /* Now fix up to local daylight time. */
353
354 if (localtime(&timbuf)->tm_isdst)
355 timbuf += -1*60*60;
356
357 (void) time(&wtmp[0].ut_time);
358
359 if(stime(&timbuf) < 0) {
360
361 tfailed++;
362 (void) fprintf(stderr, "date: no permission\n");
363
364 } else {
365 (void) time(&wtmp[1].ut_time);
366
367/* Attempt to write entries to the utmp file and to the wtmp file. */
368
369 pututline(&wtmp[0]) ;
370 pututline(&wtmp[1]) ;
371
372 if ((wf = open(WTMP_FILE, 1)) >= 0) {
373
374 (void) lseek(wf, 0L, 2);
375 (void) write(wf, (char *)wtmp, sizeof(wtmp));
376 }
377 }
378 }
379
380 if (tfailed==0)
381 (void) time(&timbuf);
382
383 cbp = ctime(&timbuf);
384 (void) write(1, cbp, 20);
385 tzn = tzname[localtime(&timbuf)->tm_isdst];
386
387 if (tzn)
388 (void) write(1, tzn, 3);
389
390 (void) write(1, cbp + 19, 6);
391 exit(tfailed ? 2 : 0);
392}
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