diff options
Diffstat (limited to 'timezone/zdump.c')
| -rw-r--r-- | timezone/zdump.c | 377 |
1 files changed, 297 insertions, 80 deletions
diff --git a/timezone/zdump.c b/timezone/zdump.c index 20bb916..bd71326 100644 --- a/timezone/zdump.c +++ b/timezone/zdump.c @@ -1,4 +1,4 @@ -static char elsieid[] = "@(#)zdump.c 7.40"; +static char elsieid[] = "@(#)zdump.c 7.61"; /* ** This code has been made independent of the rest of the time @@ -11,6 +11,15 @@ static char elsieid[] = "@(#)zdump.c 7.40"; #include "sys/types.h" /* for time_t */ #include "time.h" /* for struct tm */ #include "stdlib.h" /* for exit, malloc, atoi */ +#include "float.h" /* for FLT_MAX and DBL_MAX */ + +#ifndef ZDUMP_LO_YEAR +#define ZDUMP_LO_YEAR (-500) +#endif /* !defined ZDUMP_LO_YEAR */ + +#ifndef ZDUMP_HI_YEAR +#define ZDUMP_HI_YEAR 2500 +#endif /* !defined ZDUMP_HI_YEAR */ #ifndef MAX_STRING_LENGTH #define MAX_STRING_LENGTH 1024 @@ -61,9 +70,20 @@ static char elsieid[] = "@(#)zdump.c 7.40"; #endif /* !defined DAYSPERNYEAR */ #ifndef isleap -#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) +#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) #endif /* !defined isleap */ +#ifndef isleap_sum +/* +** See tzfile.h for details on isleap_sum. +*/ +#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) +#endif /* !defined isleap_sum */ + +#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) +#define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR) +#define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY) + #if HAVE_GETTEXT #include "locale.h" /* for setlocale */ #include "libintl.h" @@ -115,18 +135,60 @@ static char elsieid[] = "@(#)zdump.c 7.40"; extern char ** environ; extern int getopt P((int argc, char * const argv[], - const char * options)); + const char * options)); extern char * optarg; extern int optind; extern char * tzname[2]; +static time_t absolute_min_time; +static time_t absolute_max_time; +static size_t longest; +static char * progname; + static char * abbr P((struct tm * tmp)); static long delta P((struct tm * newp, struct tm * oldp)); +static void dumptime P((const struct tm * tmp)); static time_t hunt P((char * name, time_t lot, time_t hit)); -static size_t longest; -static char * progname; +static void setabsolutes P((void)); static void show P((char * zone, time_t t, int v)); -static void dumptime P((const struct tm * tmp)); +static const char * tformat P((void)); +static time_t yeartot P((long y)); + +#ifndef TYPECHECK +#define my_localtime localtime +#else /* !defined TYPECHECK */ +static struct tm * +my_localtime(tp) +time_t * tp; +{ + register struct tm * tmp; + + tmp = localtime(tp); + if (tp != NULL && tmp != NULL) { + struct tm tm; + register time_t t; + + tm = *tmp; + t = mktime(&tm); + if (t - *tp >= 1 || *tp - t >= 1) { + (void) fflush(stdout); + (void) fprintf(stderr, "\n%s: ", progname); + (void) fprintf(stderr, tformat(), *tp); + (void) fprintf(stderr, " ->"); + (void) fprintf(stderr, " sec %d", tmp->tm_sec); + (void) fprintf(stderr, " min %d", tmp->tm_min); + (void) fprintf(stderr, " hour %d", tmp->tm_hour); + (void) fprintf(stderr, " mday %d", tmp->tm_mday); + (void) fprintf(stderr, " mon %d", tmp->tm_mon); + (void) fprintf(stderr, " year %d", tmp->tm_year); + (void) fprintf(stderr, " -> "); + (void) fprintf(stderr, tformat(), t); + (void) fprintf(stderr, "\n"); + } + } + return tmp; +} +#endif /* !defined TYPECHECK */ int main(argc, argv) @@ -136,18 +198,22 @@ char * argv[]; register int i; register int c; register int vflag; - register char * cutoff; - register int cutyear; - register long cuttime; - char ** fakeenv; + register char * cutarg; + register long cutloyear = ZDUMP_LO_YEAR; + register long cuthiyear = ZDUMP_HI_YEAR; + register time_t cutlotime; + register time_t cuthitime; + register char ** fakeenv; time_t now; time_t t; time_t newt; - time_t hibit; struct tm tm; struct tm newtm; + register struct tm * tmp; + register struct tm * newtmp; - INITIALIZE(cuttime); + INITIALIZE(cutlotime); + INITIALIZE(cuthitime); #if HAVE_GETTEXT (void) setlocale(LC_MESSAGES, ""); #ifdef TZ_DOMAINDIR @@ -162,39 +228,50 @@ char * argv[]; (void) exit(EXIT_SUCCESS); } vflag = 0; - cutoff = NULL; + cutarg = NULL; while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v') if (c == 'v') vflag = 1; - else cutoff = optarg; + else cutarg = optarg; if ((c != EOF && c != -1) || (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) { (void) fprintf(stderr, -_("%s: usage is %s [ --version ] [ -v ] [ -c cutoff ] zonename ...\n"), - argv[0], argv[0]); +_("%s: usage is %s [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"), + progname, progname); (void) exit(EXIT_FAILURE); } - if (cutoff != NULL) { - int y; - - cutyear = atoi(cutoff); - cuttime = 0; - for (y = EPOCH_YEAR; y < cutyear; ++y) - cuttime += DAYSPERNYEAR + isleap(y); - cuttime *= SECSPERHOUR * HOURSPERDAY; + if (vflag) { + if (cutarg != NULL) { + long lo; + long hi; + char dummy; + + if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) { + cuthiyear = hi; + } else if (sscanf(cutarg, "%ld,%ld%c", + &lo, &hi, &dummy) == 2) { + cutloyear = lo; + cuthiyear = hi; + } else { +(void) fprintf(stderr, _("%s: wild -c argument %s\n"), + progname, cutarg); + (void) exit(EXIT_FAILURE); + } + } + setabsolutes(); + cutlotime = yeartot(cutloyear); + cuthitime = yeartot(cuthiyear); } (void) time(&now); longest = 0; for (i = optind; i < argc; ++i) if (strlen(argv[i]) > longest) longest = strlen(argv[i]); - for (hibit = 1; (hibit << 1) != 0; hibit <<= 1) - continue; { register int from; register int to; - for (i = 0; environ[i] != NULL; ++i) + for (i = 0; environ[i] != NULL; ++i) continue; fakeenv = (char **) malloc((size_t) ((i + 2) * sizeof *fakeenv)); @@ -219,58 +296,129 @@ _("%s: usage is %s [ --version ] [ -v ] [ -c cutoff ] zonename ...\n"), show(argv[i], now, FALSE); continue; } - /* - ** Get lowest value of t. - */ - t = hibit; - if (t > 0) /* time_t is unsigned */ - t = 0; + t = absolute_min_time; show(argv[i], t, TRUE); t += SECSPERHOUR * HOURSPERDAY; show(argv[i], t, TRUE); - tm = *localtime(&t); - (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); + if (t < cutlotime) + t = cutlotime; + tmp = my_localtime(&t); + if (tmp != NULL) { + tm = *tmp; + (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); + } for ( ; ; ) { - if (cutoff != NULL && t >= cuttime) + if (t >= cuthitime) break; newt = t + SECSPERHOUR * 12; - if (cutoff != NULL && newt >= cuttime) + if (newt >= cuthitime) break; if (newt <= t) break; - newtm = *localtime(&newt); - if (delta(&newtm, &tm) != (newt - t) || + newtmp = localtime(&newt); + if (newtmp != NULL) + newtm = *newtmp; + if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) : + (delta(&newtm, &tm) != (newt - t) || newtm.tm_isdst != tm.tm_isdst || - strcmp(abbr(&newtm), buf) != 0) { + strcmp(abbr(&newtm), buf) != 0)) { newt = hunt(argv[i], t, newt); - newtm = *localtime(&newt); - (void) strncpy(buf, abbr(&newtm), - (sizeof buf) - 1); + newtmp = localtime(&newt); + if (newtmp != NULL) { + newtm = *newtmp; + (void) strncpy(buf, + abbr(&newtm), + (sizeof buf) - 1); + } } t = newt; tm = newtm; + tmp = newtmp; } - /* - ** Get highest value of t. - */ - t = ~((time_t) 0); - if (t < 0) /* time_t is signed */ - t &= ~hibit; + t = absolute_max_time; t -= SECSPERHOUR * HOURSPERDAY; show(argv[i], t, TRUE); t += SECSPERHOUR * HOURSPERDAY; show(argv[i], t, TRUE); } if (fflush(stdout) || ferror(stdout)) { - (void) fprintf(stderr, "%s: ", argv[0]); + (void) fprintf(stderr, "%s: ", progname); (void) perror(_("Error writing standard output")); (void) exit(EXIT_FAILURE); } exit(EXIT_SUCCESS); + /* If exit fails to exit... */ + return EXIT_FAILURE; +} + +static void +setabsolutes() +{ + if (0.5 == (time_t) 0.5) { + /* + ** time_t is floating. + */ + if (sizeof (time_t) == sizeof (float)) { + absolute_min_time = (time_t) -FLT_MAX; + absolute_max_time = (time_t) FLT_MAX; + } else if (sizeof (time_t) == sizeof (double)) { + absolute_min_time = (time_t) -DBL_MAX; + absolute_max_time = (time_t) DBL_MAX; + } else { + (void) fprintf(stderr, +_("%s: use of -v on system with floating time_t other than float or double\n"), + progname); + (void) exit(EXIT_FAILURE); + } + } else if (0 > (time_t) -1) { + /* + ** time_t is signed. + */ + register time_t hibit; - /* gcc -Wall pacifier */ - for ( ; ; ) - continue; + for (hibit = 1; (hibit * 2) != 0; hibit *= 2) + continue; + absolute_min_time = hibit; + absolute_max_time = -(hibit + 1); + } else { + /* + ** time_t is unsigned. + */ + absolute_min_time = 0; + absolute_max_time = absolute_min_time - 1; + } +} + +static time_t +yeartot(y) +const long y; +{ + register long myy; + register long seconds; + register time_t t; + + myy = EPOCH_YEAR; + t = 0; + while (myy != y) { + if (myy < y) { + seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; + ++myy; + if (t > absolute_max_time - seconds) { + t = absolute_max_time; + break; + } + t += seconds; + } else { + --myy; + seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; + if (t < absolute_min_time + seconds) { + t = absolute_min_time; + break; + } + t -= seconds; + } + } + return t; } static time_t @@ -279,25 +427,39 @@ char * name; time_t lot; time_t hit; { - time_t t; - struct tm lotm; - struct tm tm; - static char loab[MAX_STRING_LENGTH]; - - lotm = *localtime(&lot); - (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); - while ((hit - lot) >= 2) { - t = lot / 2 + hit / 2; + time_t t; + long diff; + struct tm lotm; + register struct tm * lotmp; + struct tm tm; + register struct tm * tmp; + char loab[MAX_STRING_LENGTH]; + + lotmp = my_localtime(&lot); + if (lotmp != NULL) { + lotm = *lotmp; + (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); + } + for ( ; ; ) { + diff = (long) (hit - lot); + if (diff < 2) + break; + t = lot; + t += diff / 2; if (t <= lot) ++t; else if (t >= hit) --t; - tm = *localtime(&t); - if (delta(&tm, &lotm) == (t - lot) && + tmp = my_localtime(&t); + if (tmp != NULL) + tm = *tmp; + if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : + (delta(&tm, &lotm) == (t - lot) && tm.tm_isdst == lotm.tm_isdst && - strcmp(abbr(&tm), loab) == 0) { + strcmp(abbr(&tm), loab) == 0)) { lot = t; lotm = tm; + lotmp = tmp; } else hit = t; } show(name, lot, TRUE); @@ -314,14 +476,14 @@ delta(newp, oldp) struct tm * newp; struct tm * oldp; { - long result; - int tmy; + register long result; + register int tmy; if (newp->tm_year < oldp->tm_year) return -delta(oldp, newp); result = 0; for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy) - result += DAYSPERNYEAR + isleap(tmy + (long) TM_YEAR_BASE); + result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE); result += newp->tm_yday - oldp->tm_yday; result *= HOURSPERDAY; result += newp->tm_hour - oldp->tm_hour; @@ -338,22 +500,30 @@ char * zone; time_t t; int v; { - struct tm * tmp; + register struct tm * tmp; (void) printf("%-*s ", (int) longest, zone); if (v) { - dumptime(gmtime(&t)); - (void) printf(" UTC = "); + tmp = gmtime(&t); + if (tmp == NULL) { + (void) printf(tformat(), t); + } else { + dumptime(tmp); + (void) printf(" UTC"); + } + (void) printf(" = "); } - tmp = localtime(&t); + tmp = my_localtime(&t); dumptime(tmp); - if (*abbr(tmp) != '\0') - (void) printf(" %s", abbr(tmp)); - if (v) { - (void) printf(" isdst=%d", tmp->tm_isdst); + if (tmp != NULL) { + if (*abbr(tmp) != '\0') + (void) printf(" %s", abbr(tmp)); + if (v) { + (void) printf(" isdst=%d", tmp->tm_isdst); #ifdef TM_GMTOFF - (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF); + (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF); #endif /* defined TM_GMTOFF */ + } } (void) printf("\n"); } @@ -371,6 +541,33 @@ struct tm * tmp; return (result == NULL) ? &nada : result; } +/* +** The code below can fail on certain theoretical systems; +** it works on all known real-world systems as of 2004-12-30. +*/ + +static const char * +tformat() +{ + if (0.5 == (time_t) 0.5) { /* floating */ + if (sizeof (time_t) > sizeof (double)) + return "%Lg"; + return "%g"; + } + if (0 > (time_t) -1) { /* signed */ + if (sizeof (time_t) > sizeof (long)) + return "%lld"; + if (sizeof (time_t) > sizeof (int)) + return "%ld"; + return "%d"; + } + if (sizeof (time_t) > sizeof (unsigned long)) + return "%llu"; + if (sizeof (time_t) > sizeof (unsigned int)) + return "%lu"; + return "%u"; +} + static void dumptime(timeptr) register const struct tm * timeptr; @@ -384,7 +581,13 @@ register const struct tm * timeptr; }; register const char * wn; register const char * mn; + register int lead; + register int trail; + if (timeptr == NULL) { + (void) printf("NULL"); + return; + } /* ** The packaged versions of localtime and gmtime never put out-of-range ** values in tm_wday or tm_mon, but since this code might be compiled @@ -398,9 +601,23 @@ register const struct tm * timeptr; (int) (sizeof mon_name / sizeof mon_name[0])) mn = "???"; else mn = mon_name[timeptr->tm_mon]; - (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d %ld", + (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ", wn, mn, timeptr->tm_mday, timeptr->tm_hour, - timeptr->tm_min, timeptr->tm_sec, - timeptr->tm_year + (long) TM_YEAR_BASE); + timeptr->tm_min, timeptr->tm_sec); +#define DIVISOR 10 + trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR; + lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + + trail / DIVISOR; + trail %= DIVISOR; + if (trail < 0 && lead > 0) { + trail += DIVISOR; + --lead; + } else if (lead < 0 && trail > 0) { + trail -= DIVISOR; + ++lead; + } + if (lead == 0) + (void) printf("%d", trail); + else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail)); } |