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8211a3a80c
This import comprises the `zic' and `zdump' programs. Obtained from: Arthur David Olson, ftp://elsie.nci.nih.gov/pub/tzcode94g
308 lines
6.5 KiB
C
308 lines
6.5 KiB
C
#ifndef lint
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#ifndef NOID
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static char elsieid[] = "@(#)zdump.c 7.10";
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#endif /* !defined NOID */
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#endif /* !defined lint */
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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 "stdio.h" /* for stdout, stderr */
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#include "string.h" /* for strcpy */
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#include "sys/types.h" /* for time_t */
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#include "time.h" /* for struct tm */
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#ifndef MAX_STRING_LENGTH
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#define MAX_STRING_LENGTH 1024
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#endif /* !defined MAX_STRING_LENGTH */
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#ifndef TRUE
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#define TRUE 1
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#endif /* !defined TRUE */
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#ifndef FALSE
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#define FALSE 0
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#endif /* !defined FALSE */
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#ifndef EXIT_SUCCESS
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#define EXIT_SUCCESS 0
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#endif /* !defined EXIT_SUCCESS */
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#ifndef EXIT_FAILURE
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#define EXIT_FAILURE 1
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#endif /* !defined EXIT_FAILURE */
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#ifndef SECSPERMIN
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#define SECSPERMIN 60
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#endif /* !defined SECSPERMIN */
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#ifndef MINSPERHOUR
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#define MINSPERHOUR 60
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#endif /* !defined MINSPERHOUR */
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#ifndef SECSPERHOUR
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#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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#endif /* !defined SECSPERHOUR */
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#ifndef HOURSPERDAY
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#define HOURSPERDAY 24
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#endif /* !defined HOURSPERDAY */
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#ifndef EPOCH_YEAR
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#define EPOCH_YEAR 1970
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#endif /* !defined EPOCH_YEAR */
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#ifndef TM_YEAR_BASE
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#define TM_YEAR_BASE 1900
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#endif /* !defined TM_YEAR_BASE */
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#ifndef DAYSPERNYEAR
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#define DAYSPERNYEAR 365
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#endif /* !defined DAYSPERNYEAR */
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#ifndef isleap
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#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
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#endif /* !defined isleap */
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extern char ** environ;
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extern int getopt();
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extern char * optarg;
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extern int optind;
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extern time_t time();
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extern char * tzname[2];
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extern void tzset();
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#ifdef USG
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extern void exit();
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extern void perror();
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#endif /* defined USG */
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static char * abbr();
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static long delta();
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static time_t hunt();
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static int longest;
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static char * progname;
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static void show();
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int
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main(argc, argv)
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int argc;
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char * argv[];
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{
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register int i, c;
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register int vflag;
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register char * cutoff;
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register int cutyear;
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register long cuttime;
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time_t now;
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time_t t, newt;
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time_t hibit;
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struct tm tm, newtm;
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progname = argv[0];
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vflag = 0;
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cutoff = NULL;
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while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
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if (c == 'v')
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vflag = 1;
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else cutoff = optarg;
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if (c != EOF ||
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(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
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(void) fprintf(stderr,
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"%s: usage is %s [ -v ] [ -c cutoff ] zonename ...\n",
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argv[0], argv[0]);
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(void) exit(EXIT_FAILURE);
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}
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if (cutoff != NULL) {
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int y;
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cutyear = atoi(cutoff);
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cuttime = 0;
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for (y = EPOCH_YEAR; y < cutyear; ++y)
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cuttime += DAYSPERNYEAR + isleap(y);
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cuttime *= SECSPERHOUR * HOURSPERDAY;
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}
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(void) 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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for (hibit = 1; (hibit << 1) != 0; hibit <<= 1)
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continue;
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for (i = optind; i < argc; ++i) {
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register char ** saveenv;
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static char buf[MAX_STRING_LENGTH];
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char * fakeenv[2];
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if (strlen(argv[i]) + 4 > sizeof buf) {
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(void) fflush(stdout);
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(void) fprintf(stderr, "%s: argument too long -- %s\n",
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progname, argv[i]);
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(void) exit(EXIT_FAILURE);
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}
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(void) strcpy(buf, "TZ=");
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(void) strcat(buf, argv[i]);
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fakeenv[0] = buf;
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fakeenv[1] = NULL;
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saveenv = environ;
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environ = fakeenv;
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(void) tzset();
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environ = saveenv;
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show(argv[i], now, FALSE);
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if (!vflag)
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continue;
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/*
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** Get lowest value of t.
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*/
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t = hibit;
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if (t > 0) /* time_t is unsigned */
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t = 0;
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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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tm = *localtime(&t);
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(void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
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for ( ; ; ) {
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if (cutoff != NULL && t >= cuttime)
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break;
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newt = t + SECSPERHOUR * 12;
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if (cutoff != NULL && newt >= cuttime)
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break;
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if (newt <= t)
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break;
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newtm = *localtime(&newt);
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if (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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newtm = *localtime(&newt);
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(void) strncpy(buf, abbr(&newtm),
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(sizeof buf) - 1);
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}
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t = newt;
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tm = newtm;
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}
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/*
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** Get highest value of t.
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*/
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t = ~((time_t) 0);
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if (t < 0) /* time_t is signed */
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t &= ~hibit;
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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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(void) fprintf(stderr, "%s: Error writing standard output ",
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argv[0]);
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(void) perror("standard output");
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(void) exit(EXIT_FAILURE);
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}
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exit(EXIT_SUCCESS);
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/* gcc -Wall pacifier */
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for ( ; ; )
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continue;
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}
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static time_t
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hunt(name, lot, hit)
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char * name;
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time_t lot;
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time_t hit;
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{
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time_t t;
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struct tm lotm;
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struct tm tm;
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static char loab[MAX_STRING_LENGTH];
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lotm = *localtime(&lot);
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(void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
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while ((hit - lot) >= 2) {
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t = lot / 2 + hit / 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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tm = *localtime(&t);
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if (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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} else 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 (eggert@twinsun.com) for logic used in delta.
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*/
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static long
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delta(newp, oldp)
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struct tm * newp;
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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(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(zone, t, v)
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char * zone;
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time_t t;
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int v;
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{
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struct tm * tmp;
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extern struct tm * localtime();
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(void) printf("%-*s ", longest, zone);
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if (v)
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(void) printf("%.24s GMT = ", asctime(gmtime(&t)));
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tmp = localtime(&t);
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(void) printf("%.24s", asctime(tmp));
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if (*abbr(tmp) != '\0')
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(void) printf(" %s", abbr(tmp));
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if (v) {
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(void) printf(" isdst=%d", tmp->tm_isdst);
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#ifdef TM_GMTOFF
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(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
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#endif /* defined TM_GMTOFF */
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}
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(void) printf("\n");
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}
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static char *
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abbr(tmp)
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struct tm * tmp;
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{
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register char * result;
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static char nada[1];
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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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