3 static const char elsieid[] = "@(#)zdump.c 7.28";
4 #endif /* !defined NOID */
5 #endif /* !defined lint */
8 static const char rcsid[] =
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 void show P((char * zone, time_t t, int v));
138 static void usage(void);
148 register char * cutoff;
149 register int cutyear;
150 register long cuttime;
161 (void) setlocale(LC_MESSAGES, "");
163 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
164 #endif /* defined(TEXTDOMAINDIR) */
165 (void) textdomain(TZ_DOMAIN);
166 #endif /* HAVE_GETTEXT - 0 */
169 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
172 else cutoff = optarg;
173 if ((c != EOF && c != -1) ||
174 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
177 if (cutoff != NULL) {
180 cutyear = atoi(cutoff);
182 for (y = EPOCH_YEAR; y < cutyear; ++y)
183 cuttime += DAYSPERNYEAR + isleap(y);
184 cuttime *= SECSPERHOUR * HOURSPERDAY;
188 for (i = optind; i < argc; ++i)
189 if (strlen(argv[i]) > longest)
190 longest = strlen(argv[i]);
191 for (hibit = 1; (hibit << 1) != 0; hibit <<= 1)
197 for (i = 0; environ[i] != NULL; ++i)
199 fakeenv = (char **) malloc((size_t) ((i + 2) *
201 if (fakeenv == NULL ||
202 (fakeenv[0] = (char *) malloc((size_t) (longest +
205 _("malloc() failed"));
207 (void) strcpy(fakeenv[to++], "TZ=");
208 for (from = 0; environ[from] != NULL; ++from)
209 if (strncmp(environ[from], "TZ=", 3) != 0)
210 fakeenv[to++] = environ[from];
214 for (i = optind; i < argc; ++i) {
215 static char buf[MAX_STRING_LENGTH];
217 (void) strcpy(&fakeenv[0][3], argv[i]);
219 show(argv[i], now, FALSE);
223 ** Get lowest value of t.
226 if (t > 0) /* time_t is unsigned */
228 show(argv[i], t, TRUE);
229 t += SECSPERHOUR * HOURSPERDAY;
230 show(argv[i], t, TRUE);
232 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
234 if (cutoff != NULL && t >= cuttime)
236 newt = t + SECSPERHOUR * 12;
237 if (cutoff != NULL && newt >= cuttime)
241 newtm = *localtime(&newt);
242 if (delta(&newtm, &tm) != (newt - t) ||
243 newtm.tm_isdst != tm.tm_isdst ||
244 strcmp(abbr(&newtm), buf) != 0) {
245 newt = hunt(argv[i], t, newt);
246 newtm = *localtime(&newt);
247 (void) strncpy(buf, abbr(&newtm),
254 ** Get highest value of t.
257 if (t < 0) /* time_t is signed */
259 t -= SECSPERHOUR * HOURSPERDAY;
260 show(argv[i], t, TRUE);
261 t += SECSPERHOUR * HOURSPERDAY;
262 show(argv[i], t, TRUE);
264 if (fflush(stdout) || ferror(stdout))
265 errx(EXIT_FAILURE, _("error writing standard output"));
268 /* gcc -Wall pacifier */
276 fprintf(stderr, _("usage: zdump [-v] [-c cutoff] zonename ...\n"));
289 static char loab[MAX_STRING_LENGTH];
291 lotm = *localtime(&lot);
292 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
293 while ((hit - lot) >= 2) {
294 t = lot / 2 + hit / 2;
300 if (delta(&tm, &lotm) == (t - lot) &&
301 tm.tm_isdst == lotm.tm_isdst &&
302 strcmp(abbr(&tm), loab) == 0) {
307 show(name, lot, TRUE);
308 show(name, hit, TRUE);
313 ** Thanks to Paul Eggert (eggert@twinsun.com) for logic used in delta.
324 if (newp->tm_year < oldp->tm_year)
325 return -delta(oldp, newp);
327 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
328 result += DAYSPERNYEAR + isleap(tmy + TM_YEAR_BASE);
329 result += newp->tm_yday - oldp->tm_yday;
330 result *= HOURSPERDAY;
331 result += newp->tm_hour - oldp->tm_hour;
332 result *= MINSPERHOUR;
333 result += newp->tm_min - oldp->tm_min;
334 result *= SECSPERMIN;
335 result += newp->tm_sec - oldp->tm_sec;
347 (void) printf("%-*s ", (int) longest, zone);
349 (void) printf("%.24s UTC = ", asctime(gmtime(&t)));
351 (void) printf("%.24s", asctime(tmp));
352 if (*abbr(tmp) != '\0')
353 (void) printf(" %s", abbr(tmp));
355 (void) printf(" isdst=%d", tmp->tm_isdst);
357 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
358 #endif /* defined TM_GMTOFF */
367 register char * result;
370 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
372 result = tzname[tmp->tm_isdst];
373 return (result == NULL) ? &nada : result;