1 #ifndef lint 2 #ifndef NOID 3 static char elsieid[] = "@(#)zdump.c 7.28"; 4 #endif /* !defined NOID */ 5 #endif /* !defined lint */ 6 7 #ifndef lint 8 static const char rcsid[] = 9 "$FreeBSD: src/usr.sbin/zic/zdump.c,v 1.7 1999/08/28 01:21:19 peter Exp $"; 10 #endif /* not lint */ 11 12 /* 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. 16 */ 17 18 #include <err.h> 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 */ 24 #include <unistd.h> 25 26 #ifndef MAX_STRING_LENGTH 27 #define MAX_STRING_LENGTH 1024 28 #endif /* !defined MAX_STRING_LENGTH */ 29 30 #ifndef TRUE 31 #define TRUE 1 32 #endif /* !defined TRUE */ 33 34 #ifndef FALSE 35 #define FALSE 0 36 #endif /* !defined FALSE */ 37 38 #ifndef EXIT_SUCCESS 39 #define EXIT_SUCCESS 0 40 #endif /* !defined EXIT_SUCCESS */ 41 42 #ifndef EXIT_FAILURE 43 #define EXIT_FAILURE 1 44 #endif /* !defined EXIT_FAILURE */ 45 46 #ifndef SECSPERMIN 47 #define SECSPERMIN 60 48 #endif /* !defined SECSPERMIN */ 49 50 #ifndef MINSPERHOUR 51 #define MINSPERHOUR 60 52 #endif /* !defined MINSPERHOUR */ 53 54 #ifndef SECSPERHOUR 55 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 56 #endif /* !defined SECSPERHOUR */ 57 58 #ifndef HOURSPERDAY 59 #define HOURSPERDAY 24 60 #endif /* !defined HOURSPERDAY */ 61 62 #ifndef EPOCH_YEAR 63 #define EPOCH_YEAR 1970 64 #endif /* !defined EPOCH_YEAR */ 65 66 #ifndef TM_YEAR_BASE 67 #define TM_YEAR_BASE 1900 68 #endif /* !defined TM_YEAR_BASE */ 69 70 #ifndef DAYSPERNYEAR 71 #define DAYSPERNYEAR 365 72 #endif /* !defined DAYSPERNYEAR */ 73 74 #ifndef isleap 75 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) 76 #endif /* !defined isleap */ 77 78 #if HAVE_GETTEXT - 0 79 #include "locale.h" /* for setlocale */ 80 #include "libintl.h" 81 #endif /* HAVE_GETTEXT - 0 */ 82 83 #ifndef GNUC_or_lint 84 #ifdef lint 85 #define GNUC_or_lint 86 #endif /* defined lint */ 87 #ifndef lint 88 #ifdef __GNUC__ 89 #define GNUC_or_lint 90 #endif /* defined __GNUC__ */ 91 #endif /* !defined lint */ 92 #endif /* !defined GNUC_or_lint */ 93 94 #ifndef INITIALIZE 95 #ifdef GNUC_or_lint 96 #define INITIALIZE(x) ((x) = 0) 97 #endif /* defined GNUC_or_lint */ 98 #ifndef GNUC_or_lint 99 #define INITIALIZE(x) 100 #endif /* !defined GNUC_or_lint */ 101 #endif /* !defined INITIALIZE */ 102 103 /* 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. 107 */ 108 109 #ifndef _ 110 #if HAVE_GETTEXT - 0 111 #define _(msgid) gettext(msgid) 112 #else /* !(HAVE_GETTEXT - 0) */ 113 #define _(msgid) msgid 114 #endif /* !(HAVE_GETTEXT - 0) */ 115 #endif /* !defined _ */ 116 117 #ifndef TZ_DOMAIN 118 #define TZ_DOMAIN "tz" 119 #endif /* !defined TZ_DOMAIN */ 120 121 #ifndef P 122 #ifdef __STDC__ 123 #define P(x) x 124 #endif /* defined __STDC__ */ 125 #ifndef __STDC__ 126 #define P(x) () 127 #endif /* !defined __STDC__ */ 128 #endif /* !defined P */ 129 130 extern char ** environ; 131 extern char * tzname[2]; 132 133 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); 140 141 int 142 main(argc, argv) 143 int argc; 144 char * argv[]; 145 { 146 register int i; 147 register int c; 148 register int vflag; 149 register char * cutoff; 150 register int cutyear; 151 register long cuttime; 152 char ** fakeenv; 153 time_t now; 154 time_t t; 155 time_t newt; 156 time_t hibit; 157 struct tm tm; 158 struct tm newtm; 159 160 INITIALIZE(cuttime); 161 #if HAVE_GETTEXT - 0 162 (void) setlocale(LC_MESSAGES, ""); 163 #ifdef TZ_DOMAINDIR 164 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR); 165 #endif /* defined(TEXTDOMAINDIR) */ 166 (void) textdomain(TZ_DOMAIN); 167 #endif /* HAVE_GETTEXT - 0 */ 168 vflag = 0; 169 cutoff = NULL; 170 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v') 171 if (c == 'v') 172 vflag = 1; 173 else cutoff = optarg; 174 if ((c != EOF && c != -1) || 175 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) { 176 usage(); 177 } 178 if (cutoff != NULL) { 179 int y; 180 181 cutyear = atoi(cutoff); 182 cuttime = 0; 183 for (y = EPOCH_YEAR; y < cutyear; ++y) 184 cuttime += DAYSPERNYEAR + isleap(y); 185 cuttime *= SECSPERHOUR * HOURSPERDAY; 186 } 187 (void) time(&now); 188 longest = 0; 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) 193 continue; 194 { 195 register int from; 196 register int to; 197 198 for (i = 0; environ[i] != NULL; ++i) 199 continue; 200 fakeenv = (char **) malloc((size_t) ((i + 2) * 201 sizeof *fakeenv)); 202 if (fakeenv == NULL || 203 (fakeenv[0] = (char *) malloc((size_t) (longest + 204 4))) == NULL) 205 errx(EXIT_FAILURE, 206 _("malloc() failed")); 207 to = 0; 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]; 212 fakeenv[to] = NULL; 213 environ = fakeenv; 214 } 215 for (i = optind; i < argc; ++i) { 216 static char buf[MAX_STRING_LENGTH]; 217 218 (void) strcpy(&fakeenv[0][3], argv[i]); 219 if (!vflag) { 220 show(argv[i], now, FALSE); 221 continue; 222 } 223 /* 224 ** Get lowest value of t. 225 */ 226 t = hibit; 227 if (t > 0) /* time_t is unsigned */ 228 t = 0; 229 show(argv[i], t, TRUE); 230 t += SECSPERHOUR * HOURSPERDAY; 231 show(argv[i], t, TRUE); 232 tm = *localtime(&t); 233 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); 234 for ( ; ; ) { 235 if (cutoff != NULL && t >= cuttime) 236 break; 237 newt = t + SECSPERHOUR * 12; 238 if (cutoff != NULL && newt >= cuttime) 239 break; 240 if (newt <= t) 241 break; 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), 249 (sizeof buf) - 1); 250 } 251 t = newt; 252 tm = newtm; 253 } 254 /* 255 ** Get highest value of t. 256 */ 257 t = ~((time_t) 0); 258 if (t < 0) /* time_t is signed */ 259 t &= ~hibit; 260 t -= SECSPERHOUR * HOURSPERDAY; 261 show(argv[i], t, TRUE); 262 t += SECSPERHOUR * HOURSPERDAY; 263 show(argv[i], t, TRUE); 264 } 265 if (fflush(stdout) || ferror(stdout)) 266 errx(EXIT_FAILURE, _("error writing standard output")); 267 exit(EXIT_SUCCESS); 268 269 /* gcc -Wall pacifier */ 270 for ( ; ; ) 271 continue; 272 } 273 274 static void 275 usage(void) 276 { 277 fprintf(stderr, _("usage: zdump [-v] [-c cutoff] zonename ...\n")); 278 exit(EXIT_FAILURE); 279 } 280 281 static time_t 282 hunt(name, lot, hit) 283 char * name; 284 time_t lot; 285 time_t hit; 286 { 287 time_t t; 288 struct tm lotm; 289 struct tm tm; 290 static char loab[MAX_STRING_LENGTH]; 291 292 lotm = *localtime(&lot); 293 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); 294 while ((hit - lot) >= 2) { 295 t = lot / 2 + hit / 2; 296 if (t <= lot) 297 ++t; 298 else if (t >= hit) 299 --t; 300 tm = *localtime(&t); 301 if (delta(&tm, &lotm) == (t - lot) && 302 tm.tm_isdst == lotm.tm_isdst && 303 strcmp(abbr(&tm), loab) == 0) { 304 lot = t; 305 lotm = tm; 306 } else hit = t; 307 } 308 show(name, lot, TRUE); 309 show(name, hit, TRUE); 310 return hit; 311 } 312 313 /* 314 ** Thanks to Paul Eggert (eggert@twinsun.com) for logic used in delta. 315 */ 316 317 static long 318 delta(newp, oldp) 319 struct tm * newp; 320 struct tm * oldp; 321 { 322 long result; 323 int tmy; 324 325 if (newp->tm_year < oldp->tm_year) 326 return -delta(oldp, newp); 327 result = 0; 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; 337 return result; 338 } 339 340 static void 341 show(zone, t, v) 342 char * zone; 343 time_t t; 344 int v; 345 { 346 struct tm * tmp; 347 348 (void) printf("%-*s ", (int) longest, zone); 349 if (v) 350 (void) printf("%.24s UTC = ", asctime(gmtime(&t))); 351 tmp = localtime(&t); 352 (void) printf("%.24s", asctime(tmp)); 353 if (*abbr(tmp) != '\0') 354 (void) printf(" %s", abbr(tmp)); 355 if (v) { 356 (void) printf(" isdst=%d", tmp->tm_isdst); 357 #ifdef TM_GMTOFF 358 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF); 359 #endif /* defined TM_GMTOFF */ 360 } 361 (void) printf("\n"); 362 } 363 364 static char * 365 abbr(tmp) 366 struct tm * tmp; 367 { 368 register char * result; 369 static char nada; 370 371 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1) 372 return &nada; 373 result = tzname[tmp->tm_isdst]; 374 return (result == NULL) ? &nada : result; 375 } 376