3 static char elsieid[] = "@(#)zdump.c 7.28";
4 #endif /* !defined NOID */
5 #endif /* !defined lint */
9 * $FreeBSD: src/usr.sbin/zic/zdump.c,v 1.7 1999/08/28 01:21:19 peter Exp $
10 * $DragonFly: src/usr.sbin/zic/zdump.c,v 1.2 2003/06/17 04:30:05 dillon Exp $
13 ** This code has been made independent of the rest of the time
14 ** conversion package to increase confidence in the verification it provides.
15 ** You can use this code to help in verifying other implementations.
19 #include <stdio.h> /* for stdout, stderr */
20 #include <stdlib.h> /* for exit, malloc, atoi */
21 #include <string.h> /* for strcpy */
22 #include <sys/types.h> /* for time_t */
23 #include <time.h> /* for struct tm */
26 #ifndef MAX_STRING_LENGTH
27 #define MAX_STRING_LENGTH 1024
28 #endif /* !defined MAX_STRING_LENGTH */
32 #endif /* !defined TRUE */
36 #endif /* !defined FALSE */
39 #define EXIT_SUCCESS 0
40 #endif /* !defined EXIT_SUCCESS */
43 #define EXIT_FAILURE 1
44 #endif /* !defined EXIT_FAILURE */
48 #endif /* !defined SECSPERMIN */
51 #define MINSPERHOUR 60
52 #endif /* !defined MINSPERHOUR */
55 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
56 #endif /* !defined SECSPERHOUR */
59 #define HOURSPERDAY 24
60 #endif /* !defined HOURSPERDAY */
63 #define EPOCH_YEAR 1970
64 #endif /* !defined EPOCH_YEAR */
67 #define TM_YEAR_BASE 1900
68 #endif /* !defined TM_YEAR_BASE */
71 #define DAYSPERNYEAR 365
72 #endif /* !defined DAYSPERNYEAR */
75 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
76 #endif /* !defined isleap */
79 #include "locale.h" /* for setlocale */
81 #endif /* HAVE_GETTEXT - 0 */
86 #endif /* defined lint */
90 #endif /* defined __GNUC__ */
91 #endif /* !defined lint */
92 #endif /* !defined GNUC_or_lint */
96 #define INITIALIZE(x) ((x) = 0)
97 #endif /* defined GNUC_or_lint */
100 #endif /* !defined GNUC_or_lint */
101 #endif /* !defined INITIALIZE */
104 ** For the benefit of GNU folk...
105 ** `_(MSGID)' uses the current locale's message library string for MSGID.
106 ** The default is to use gettext if available, and use MSGID otherwise.
111 #define _(msgid) gettext(msgid)
112 #else /* !(HAVE_GETTEXT - 0) */
113 #define _(msgid) msgid
114 #endif /* !(HAVE_GETTEXT - 0) */
115 #endif /* !defined _ */
118 #define TZ_DOMAIN "tz"
119 #endif /* !defined TZ_DOMAIN */
124 #endif /* defined __STDC__ */
127 #endif /* !defined __STDC__ */
128 #endif /* !defined P */
130 extern char ** environ;
131 extern char * tzname[2];
133 static char * abbr P((struct tm * tmp));
134 static long delta P((struct tm * newp, struct tm * oldp));
135 static time_t hunt P((char * name, time_t lot, time_t hit));
136 static size_t longest;
137 static char * progname;
138 static void show P((char * zone, time_t t, int v));
139 static void usage(void);
149 register char * cutoff;
150 register int cutyear;
151 register long cuttime;
162 (void) setlocale(LC_MESSAGES, "");
164 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
165 #endif /* defined(TEXTDOMAINDIR) */
166 (void) textdomain(TZ_DOMAIN);
167 #endif /* HAVE_GETTEXT - 0 */
170 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
173 else cutoff = optarg;
174 if ((c != EOF && c != -1) ||
175 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
178 if (cutoff != NULL) {
181 cutyear = atoi(cutoff);
183 for (y = EPOCH_YEAR; y < cutyear; ++y)
184 cuttime += DAYSPERNYEAR + isleap(y);
185 cuttime *= SECSPERHOUR * HOURSPERDAY;
189 for (i = optind; i < argc; ++i)
190 if (strlen(argv[i]) > longest)
191 longest = strlen(argv[i]);
192 for (hibit = 1; (hibit << 1) != 0; hibit <<= 1)
198 for (i = 0; environ[i] != NULL; ++i)
200 fakeenv = (char **) malloc((size_t) ((i + 2) *
202 if (fakeenv == NULL ||
203 (fakeenv[0] = (char *) malloc((size_t) (longest +
206 _("malloc() failed"));
208 (void) strcpy(fakeenv[to++], "TZ=");
209 for (from = 0; environ[from] != NULL; ++from)
210 if (strncmp(environ[from], "TZ=", 3) != 0)
211 fakeenv[to++] = environ[from];
215 for (i = optind; i < argc; ++i) {
216 static char buf[MAX_STRING_LENGTH];
218 (void) strcpy(&fakeenv[0][3], argv[i]);
220 show(argv[i], now, FALSE);
224 ** Get lowest value of t.
227 if (t > 0) /* time_t is unsigned */
229 show(argv[i], t, TRUE);
230 t += SECSPERHOUR * HOURSPERDAY;
231 show(argv[i], t, TRUE);
233 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
235 if (cutoff != NULL && t >= cuttime)
237 newt = t + SECSPERHOUR * 12;
238 if (cutoff != NULL && newt >= cuttime)
242 newtm = *localtime(&newt);
243 if (delta(&newtm, &tm) != (newt - t) ||
244 newtm.tm_isdst != tm.tm_isdst ||
245 strcmp(abbr(&newtm), buf) != 0) {
246 newt = hunt(argv[i], t, newt);
247 newtm = *localtime(&newt);
248 (void) strncpy(buf, abbr(&newtm),
255 ** Get highest value of t.
258 if (t < 0) /* time_t is signed */
260 t -= SECSPERHOUR * HOURSPERDAY;
261 show(argv[i], t, TRUE);
262 t += SECSPERHOUR * HOURSPERDAY;
263 show(argv[i], t, TRUE);
265 if (fflush(stdout) || ferror(stdout))
266 errx(EXIT_FAILURE, _("error writing standard output"));
269 /* gcc -Wall pacifier */
277 fprintf(stderr, _("usage: zdump [-v] [-c cutoff] zonename ...\n"));
290 static char loab[MAX_STRING_LENGTH];
292 lotm = *localtime(&lot);
293 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
294 while ((hit - lot) >= 2) {
295 t = lot / 2 + hit / 2;
301 if (delta(&tm, &lotm) == (t - lot) &&
302 tm.tm_isdst == lotm.tm_isdst &&
303 strcmp(abbr(&tm), loab) == 0) {
308 show(name, lot, TRUE);
309 show(name, hit, TRUE);
314 ** Thanks to Paul Eggert (eggert@twinsun.com) for logic used in delta.
325 if (newp->tm_year < oldp->tm_year)
326 return -delta(oldp, newp);
328 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
329 result += DAYSPERNYEAR + isleap(tmy + TM_YEAR_BASE);
330 result += newp->tm_yday - oldp->tm_yday;
331 result *= HOURSPERDAY;
332 result += newp->tm_hour - oldp->tm_hour;
333 result *= MINSPERHOUR;
334 result += newp->tm_min - oldp->tm_min;
335 result *= SECSPERMIN;
336 result += newp->tm_sec - oldp->tm_sec;
348 (void) printf("%-*s ", (int) longest, zone);
350 (void) printf("%.24s UTC = ", asctime(gmtime(&t)));
352 (void) printf("%.24s", asctime(tmp));
353 if (*abbr(tmp) != '\0')
354 (void) printf(" %s", abbr(tmp));
356 (void) printf(" isdst=%d", tmp->tm_isdst);
358 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
359 #endif /* defined TM_GMTOFF */
368 register char * result;
371 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
373 result = tzname[tmp->tm_isdst];
374 return (result == NULL) ? &nada : result;