461 lines
9.9 KiB
C
461 lines
9.9 KiB
C
/* $OpenBSD: zdump.c,v 1.14 2016/03/15 19:50:48 millert Exp $ */
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/*
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** This file is in the public domain, so clarified as of
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** 2009-05-17 by Arthur David Olson.
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*/
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/*
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** This code has been made independent of the rest of the time
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** conversion package to increase confidence in the verification it provides.
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** You can use this code to help in verifying other implementations.
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#define ZDUMP_LO_YEAR (-500)
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#define ZDUMP_HI_YEAR 2500
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#define MAX_STRING_LENGTH 1024
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#define TRUE 1
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#define FALSE 0
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#define SECSPERMIN 60
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#define MINSPERHOUR 60
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#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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#define HOURSPERDAY 24
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#define EPOCH_YEAR 1970
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#define TM_YEAR_BASE 1900
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#define DAYSPERNYEAR 365
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#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
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#define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
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#define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
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#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
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#ifndef isleap_sum
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/*
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** See tzfile.h for details on isleap_sum.
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*/
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#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
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#endif /* !defined isleap_sum */
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extern char **environ;
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extern char *tzname[2];
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extern char *__progname;
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time_t absolute_min_time;
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time_t absolute_max_time;
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size_t longest;
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int warned;
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static char *abbr(struct tm *tmp);
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static void abbrok(const char *abbrp, const char *zone);
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static long delta(struct tm *newp, struct tm *oldp);
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static void dumptime(const struct tm *tmp);
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static time_t hunt(char *name, time_t lot, time_t hit);
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static void setabsolutes(void);
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static void show(char *zone, time_t t, int v);
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static const char *tformat(void);
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static time_t yeartot(long y);
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static void usage(void);
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static void
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abbrok(const char * const abbrp, const char * const zone)
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{
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const char *cp;
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char *wp;
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if (warned)
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return;
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cp = abbrp;
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wp = NULL;
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while (isascii((unsigned char)*cp) &&
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(isalnum((unsigned char)*cp) || *cp == '-' || *cp == '+'))
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++cp;
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if (cp - abbrp < 3)
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wp = "has fewer than 3 characters";
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else if (cp - abbrp > 6)
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wp = "has more than 6 characters";
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else if (*cp)
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wp = "has characters other than ASCII alphanumerics, '-' or '+'";
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else
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return;
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fflush(stdout);
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fprintf(stderr, "%s: warning: zone \"%s\" abbreviation \"%s\" %s\n",
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__progname, zone, abbrp, wp);
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warned = TRUE;
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [-v] [-c [loyear,]hiyear] zonename ...\n",
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__progname);
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exit(EXIT_FAILURE);
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}
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int
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main(int argc, char *argv[])
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{
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int i, c, vflag = 0;
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char *cutarg = NULL;
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long cutloyear = ZDUMP_LO_YEAR;
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long cuthiyear = ZDUMP_HI_YEAR;
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time_t cutlotime = 0, cuthitime = 0;
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time_t now, t, newt;
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struct tm tm, newtm, *tmp, *newtmp;
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char **fakeenv;
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if (pledge("stdio rpath", NULL) == -1) {
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perror("pledge");
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exit(1);
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}
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while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v') {
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switch (c) {
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case 'v':
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vflag = 1;
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break;
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case 'c':
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cutarg = optarg;
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break;
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default:
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usage();
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break;
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}
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}
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if (c != -1 ||
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(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
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usage();
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}
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if (vflag) {
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if (cutarg != NULL) {
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long lo, hi;
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char dummy;
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if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
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cuthiyear = hi;
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} else if (sscanf(cutarg, "%ld,%ld%c",
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&lo, &hi, &dummy) == 2) {
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cutloyear = lo;
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cuthiyear = hi;
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} else {
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fprintf(stderr, "%s: wild -c argument %s\n",
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__progname, cutarg);
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exit(EXIT_FAILURE);
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}
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}
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setabsolutes();
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cutlotime = yeartot(cutloyear);
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cuthitime = yeartot(cuthiyear);
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}
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time(&now);
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longest = 0;
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for (i = optind; i < argc; ++i)
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if (strlen(argv[i]) > longest)
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longest = strlen(argv[i]);
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{
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int from, to;
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for (i = 0; environ[i] != NULL; ++i)
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continue;
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fakeenv = reallocarray(NULL, i + 2, sizeof *fakeenv);
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if (fakeenv == NULL ||
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(fakeenv[0] = malloc(longest + 4)) == NULL) {
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perror(__progname);
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exit(EXIT_FAILURE);
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}
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to = 0;
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strlcpy(fakeenv[to++], "TZ=", longest + 4);
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for (from = 0; environ[from] != NULL; ++from)
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if (strncmp(environ[from], "TZ=", 3) != 0)
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fakeenv[to++] = environ[from];
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fakeenv[to] = NULL;
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environ = fakeenv;
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}
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for (i = optind; i < argc; ++i) {
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char buf[MAX_STRING_LENGTH];
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strlcpy(&fakeenv[0][3], argv[i], longest + 1);
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if (!vflag) {
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show(argv[i], now, FALSE);
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continue;
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}
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warned = FALSE;
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t = absolute_min_time;
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show(argv[i], t, TRUE);
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t += SECSPERHOUR * HOURSPERDAY;
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show(argv[i], t, TRUE);
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if (t < cutlotime)
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t = cutlotime;
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tmp = localtime(&t);
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if (tmp != NULL) {
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tm = *tmp;
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strlcpy(buf, abbr(&tm), sizeof buf);
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}
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for ( ; ; ) {
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if (t >= cuthitime || t >= cuthitime - SECSPERHOUR * 12)
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break;
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newt = t + SECSPERHOUR * 12;
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newtmp = localtime(&newt);
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if (newtmp != NULL)
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newtm = *newtmp;
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if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
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(delta(&newtm, &tm) != (newt - t) ||
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newtm.tm_isdst != tm.tm_isdst ||
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strcmp(abbr(&newtm), buf) != 0)) {
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newt = hunt(argv[i], t, newt);
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newtmp = localtime(&newt);
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if (newtmp != NULL) {
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newtm = *newtmp;
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strlcpy(buf, abbr(&newtm), sizeof buf);
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}
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}
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t = newt;
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tm = newtm;
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tmp = newtmp;
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}
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t = absolute_max_time;
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t -= SECSPERHOUR * HOURSPERDAY;
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show(argv[i], t, TRUE);
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t += SECSPERHOUR * HOURSPERDAY;
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show(argv[i], t, TRUE);
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}
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if (fflush(stdout) || ferror(stdout)) {
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fprintf(stderr, "%s: ", __progname);
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perror("Error writing to standard output");
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exit(EXIT_FAILURE);
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}
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return 0;
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}
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static void
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setabsolutes(void)
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{
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time_t t = 0, t1 = 1;
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while (t < t1) {
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t = t1;
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t1 = 2 * t1 + 1;
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}
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absolute_max_time = t;
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t = -t;
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absolute_min_time = t - 1;
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if (t < absolute_min_time)
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absolute_min_time = t;
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}
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static time_t
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yeartot(const long y)
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{
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long myy = EPOCH_YEAR, seconds;
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time_t t = 0;
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while (myy != y) {
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if (myy < y) {
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seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
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++myy;
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if (t > absolute_max_time - seconds) {
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t = absolute_max_time;
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break;
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}
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t += seconds;
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} else {
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--myy;
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seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
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if (t < absolute_min_time + seconds) {
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t = absolute_min_time;
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break;
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}
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t -= seconds;
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}
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}
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return t;
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}
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static time_t
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hunt(char *name, time_t lot, time_t hit)
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{
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time_t t;
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long diff;
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struct tm lotm, *lotmp;
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struct tm tm, *tmp;
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char loab[MAX_STRING_LENGTH];
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lotmp = localtime(&lot);
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if (lotmp != NULL) {
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lotm = *lotmp;
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strlcpy(loab, abbr(&lotm), sizeof loab);
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}
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for ( ; ; ) {
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diff = (long) (hit - lot);
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if (diff < 2)
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break;
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t = lot;
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t += diff / 2;
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if (t <= lot)
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++t;
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else if (t >= hit)
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--t;
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tmp = localtime(&t);
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if (tmp != NULL)
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tm = *tmp;
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if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
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(delta(&tm, &lotm) == (t - lot) &&
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tm.tm_isdst == lotm.tm_isdst &&
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strcmp(abbr(&tm), loab) == 0)) {
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lot = t;
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lotm = tm;
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lotmp = tmp;
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} else
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hit = t;
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}
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show(name, lot, TRUE);
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show(name, hit, TRUE);
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return hit;
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}
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/*
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** Thanks to Paul Eggert for logic used in delta.
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*/
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static long
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delta(struct tm *newp, struct tm *oldp)
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{
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long result;
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int tmy;
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if (newp->tm_year < oldp->tm_year)
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return -delta(oldp, newp);
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result = 0;
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for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
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result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
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result += newp->tm_yday - oldp->tm_yday;
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result *= HOURSPERDAY;
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result += newp->tm_hour - oldp->tm_hour;
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result *= MINSPERHOUR;
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result += newp->tm_min - oldp->tm_min;
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result *= SECSPERMIN;
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result += newp->tm_sec - oldp->tm_sec;
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return result;
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}
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static void
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show(char *zone, time_t t, int v)
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{
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struct tm *tmp;
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printf("%-*s ", (int) longest, zone);
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if (v) {
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tmp = gmtime(&t);
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if (tmp == NULL) {
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printf(tformat(), t);
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} else {
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dumptime(tmp);
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printf(" UTC");
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}
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printf(" = ");
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}
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tmp = localtime(&t);
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dumptime(tmp);
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if (tmp != NULL) {
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if (*abbr(tmp) != '\0')
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printf(" %s", abbr(tmp));
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if (v) {
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printf(" isdst=%d", tmp->tm_isdst);
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#ifdef TM_GMTOFF
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printf(" gmtoff=%ld", tmp->TM_GMTOFF);
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#endif /* defined TM_GMTOFF */
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}
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}
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printf("\n");
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if (tmp != NULL && *abbr(tmp) != '\0')
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abbrok(abbr(tmp), zone);
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}
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static char *
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abbr(struct tm *tmp)
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{
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char *result;
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static char nada;
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if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
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return &nada;
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result = tzname[tmp->tm_isdst];
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return (result == NULL) ? &nada : result;
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}
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/*
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** The code below can fail on certain theoretical systems;
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** it works on all known real-world systems as of 2004-12-30.
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*/
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static const char *
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tformat(void)
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{
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return "%lld";
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}
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static void
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dumptime(const struct tm *timeptr)
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{
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static const char wday_name[][3] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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static const char mon_name[][3] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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const char *wn, *mn;
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int lead, trail;
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if (timeptr == NULL) {
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printf("NULL");
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return;
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}
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/*
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** The packaged versions of localtime and gmtime never put out-of-range
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** values in tm_wday or tm_mon, but since this code might be compiled
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** with other (perhaps experimental) versions, paranoia is in order.
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*/
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if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
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(int) (sizeof wday_name / sizeof wday_name[0]))
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wn = "???";
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else
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wn = wday_name[timeptr->tm_wday];
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if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
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(int) (sizeof mon_name / sizeof mon_name[0]))
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mn = "???";
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else
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mn = mon_name[timeptr->tm_mon];
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printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
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wn, mn,
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timeptr->tm_mday, timeptr->tm_hour,
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timeptr->tm_min, timeptr->tm_sec);
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#define DIVISOR 10
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trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
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lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
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trail / DIVISOR;
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trail %= DIVISOR;
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if (trail < 0 && lead > 0) {
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trail += DIVISOR;
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--lead;
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} else if (lead < 0 && trail > 0) {
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trail -= DIVISOR;
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++lead;
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}
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if (lead == 0)
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printf("%d", trail);
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else
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printf("%d%d", lead, ((trail < 0) ? -trail : trail));
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}
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