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https://frontier.innolan.net/rainlance/amiga-tz.git
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vast simplification
SCCS-file: date.c SCCS-SID: 3.12
This commit is contained in:
Arthur David Olson
committed by
Paul Eggert
Paul Eggert
parent
fdc8f357ac
commit
9a7608ada2
376
date.c
376
date.c
@ -55,71 +55,35 @@ static char sccsid[] = "@(#)date.c 4.23 (Berkeley) 9/20/88";
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/*
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** What options should be provided?
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** We normally provide everything we can, and "#define X_OPTION"
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** for each option provided. If "NO_X_OPTION" is defined for some case,
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** we leave the option out.
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** If "NO_X_OPTION" is defined for some case, we leave the option out.
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**
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** "-u" is provided unconditionally.
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*/
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/*
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** Nothing special needed for BSD's "-n" option to not notify networked systems
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** of a time change--on non-networked systems, "date -n" == "date".
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*/
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#ifndef N_OPTION
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#ifndef NO_N_OPTION
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#define N_OPTION
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#endif /* !defined NO_N_OPTION */
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#endif /* !defined N_OPTION */
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/*
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** BSD's "-d dst" and "-t min-west" options, for setting the kernel's
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** notion of dst and offset, require the "settimeofday" system call;
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** its availability is deduced from "DST_NONE" being defined.
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*/
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#ifndef D_OPTION
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#ifndef NO_D_OPTION
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#ifdef DST_NONE
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#define D_OPTION
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#endif /* defined DST_NONE */
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#endif /* !defined NO_D_OPTION */
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#endif /* !defined D_OPTION */
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#ifndef T_OPTION
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#ifndef NO_T_OPTION
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#ifdef DST_NONE
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#define T_OPTION
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#endif /* defined DST_NONE */
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#endif /* !defined NO_T_OPTION */
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#endif /* !defined T_OPTION */
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/*
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** Sun's "-a sss.fff" option to slowly adjust the time requires the
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** "adjtime" system call. We assume it's available if DST_NONE is defined.
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*/
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#ifndef A_OPTION
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#ifndef NO_A_OPTION
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#ifdef DST_NONE
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#define A_OPTION
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#endif /* defined DST_NONE */
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#endif /* !defined NO_A_OPTION */
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#endif /* !defined A_OPTION */
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/*
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** So much for options. One "combination" setting makes life easier.
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*/
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#ifdef D_OPTION
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#define D_OR_T_OPTION
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#else /* !defined D_OPTION */
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#ifdef T_OPTION
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#define D_OR_T_OPTION
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#endif /* defined T_OPTION */
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#endif /* !defined D_OPTION */
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/*
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** Finally, a feature.
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*/
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@ -154,6 +118,15 @@ static char sccsid[] = "@(#)date.c 4.23 (Berkeley) 9/20/88";
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#define EXIT_FAILURE 1
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#endif /* !defined EXIT_FAILURE */
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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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extern double atof();
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extern char ** environ;
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extern char * getlogin();
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extern int logwtmp();
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@ -168,7 +141,9 @@ static int retval = EXIT_SUCCESS;
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static void checkfinal();
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static int comptm();
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static time_t convert();
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static void display();
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static void dogmt();
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static void errensure();
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static void iffy();
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#ifdef TSP_SETDATE
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@ -176,14 +151,13 @@ int netsettime();
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#endif /* defined TSP_SETDATE */
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static char * nondigit();
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static void oops();
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static time_t convert();
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static void reset();
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static void timeout();
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static void usage();
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static void wildinput();
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static time_t xtime();
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static char options[132];
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static char usemes[132];
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static char usemes[132];
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int
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main(argc, argv)
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@ -193,26 +167,18 @@ char * argv[];
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register char * format;
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register char * value;
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register char * cp;
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register char * username;
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register int ch;
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register int convtype;
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register int dousg;
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register int aflag = 0;
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register int dflag = 0;
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register int nflag = 0;
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register int tflag = 0;
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register int minuteswest;
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register int dsttime;
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register float adjust;
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time_t now;
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time_t t;
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#ifdef DST_NONE
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static struct timeval tv; /* static so tv_usec is 0 */
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#endif /* defined DST_NONE */
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#ifdef TSP_SETDATE
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register int nflag = 0;
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#endif /* defined TSP_SETDATE */
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#ifdef D_OR_T_OPTION
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register int dflag = 0;
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register int tflag = 0;
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struct timezone tz;
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#endif /* defined D_OR_T_OPTION */
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#ifdef A_OPTION
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register int aflag = 0;
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struct timeval atv;
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#endif /* defined A_OPTION */
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char options[132];
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(void) time(&now);
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format = value = NULL;
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@ -255,27 +221,11 @@ char * argv[];
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default:
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usage();
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case 'u': /* do it in GMT */
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{
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register char ** saveenv;
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static char * fakeenv[] = {
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"TZ=GMT0",
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NULL
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};
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saveenv = environ;
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environ = fakeenv;
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tzset();
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environ = saveenv;
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}
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dogmt();
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break;
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#ifdef N_OPTION
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case 'n': /* don't set network */
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#ifdef TSP_SETDATE
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nflag = 1;
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#endif /* defined TSP_SETDATE */
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break;
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#endif /* defined N_OPTION */
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#ifdef D_OPTION
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case 'd': /* daylight savings time */
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if (dflag) {
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(void) fprintf(stderr,
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@ -284,13 +234,11 @@ char * argv[];
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}
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dflag = 1;
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cp = optarg;
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tz.tz_dsttime = atoi(cp);
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if (*optarg == '\0' || *nondigit(cp) != '\0')
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dsttime = atoi(cp);
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if (*cp == '\0' || *nondigit(cp) != '\0')
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wildinput("-t value", optarg,
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"must be a non-negative number");
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break;
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#endif /* defined D_OPTION */
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#ifdef T_OPTION
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case 't': /* minutes west of GMT */
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if (tflag) {
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(void) fprintf(stderr,
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@ -299,15 +247,13 @@ char * argv[];
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}
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tflag = 1;
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cp = optarg;
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tz.tz_minuteswest = atoi(cp);
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minuteswest = atoi(cp);
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if (*cp == '+' || *cp == '-')
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++cp;
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if (*cp == '\0' || *nondigit(cp) != '\0')
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wildinput("-d value", optarg,
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"must be a number");
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break;
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#endif /* defined T_OPTION */
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#ifdef A_OPTION
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case 'a': /* adjustment */
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if (aflag) {
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(void) fprintf(stderr,
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@ -316,28 +262,19 @@ char * argv[];
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}
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aflag = 1;
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cp = optarg;
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{
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float f;
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extern double atof();
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f = atof(cp);
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if (*cp == '+' || *cp == '-')
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++cp;
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if (*cp == '\0' || strcmp(cp, ".") == 0)
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wildinput("-a value", optarg,
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"must be a number");
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cp = nondigit(cp);
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if (*cp == '.')
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++cp;
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if (*nondigit(cp) != '\0')
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wildinput("-a value", optarg,
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"must be a number");
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atv.tv_sec = (int) f;
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atv.tv_usec =
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(int) ((f - atv.tv_sec) * 1000000);
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}
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adjust = atof(cp);
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if (*cp == '+' || *cp == '-')
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++cp;
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if (*cp == '\0' || strcmp(cp, ".") == 0)
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wildinput("-a value", optarg,
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"must be a number");
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cp = nondigit(cp);
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if (*cp == '.')
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++cp;
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if (*nondigit(cp) != '\0')
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wildinput("-a value", optarg,
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"must be a number");
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break;
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#endif /* defined A_OPTION */
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}
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}
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while (optind < argc) {
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@ -359,50 +296,100 @@ char * argv[];
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}
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}
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if (value != NULL) {
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t = convert(value, (convtype = 0), now);
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#ifdef USG_INPUT
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t = convert(value, (dousg = FALSE), now);
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if (t == -1)
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t = convert(value, (convtype = 1), now);
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#endif /* defined USG_INPUT */
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t = convert(value, (dousg = TRUE), now);
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if (t == -1) {
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/*
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** Utterly nonsensical time,
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** or time that falls in a DST transition hole.
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** Out of range values,
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** or time that falls in a DST transition hole?
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*/
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dogmt();
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t = convert(value, FALSE, now);
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if (t == -1)
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t = convert(value, TRUE, now);
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wildinput("time", value,
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"can't be converted to time_t");
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(t == -1) ?
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"out of range value given" :
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"time skipped when clock springs forward");
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}
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}
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/*
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** Entire command line has now been checked.
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*/
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#ifdef A_OPTION
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if (aflag) {
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if (adjtime(&atv, (struct timeval *) NULL) != 0)
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#ifdef DST_NONE
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struct timeval tv;
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tv.tv_sec = (int) adjust;
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tv.tv_usec = (int) ((adjust - tv.tv_sec) * 1000000);
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if (adjtime(&tv, (struct timeval *) NULL) != 0)
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oops("date: error: adjtime");
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#else /* !defined DST_NONE */
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reset((time_t) (now + adjust), nflag);
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#endif /* !defined DST_NONE */
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/*
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** Sun silently ignores everything else; we follow suit.
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*/
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(void) exit(retval);
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}
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#endif /* defined A_OPTION */
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#ifdef D_OR_T_OPTION
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if (dflag || tflag) {
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struct timezone outz;
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#ifdef DST_NONE
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struct timezone tz;
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if (!dflag || !tflag)
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if (gettimeofday((struct timeval *) NULL, &outz) != 0)
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if (gettimeofday((struct timeval *) NULL, &tz) != 0)
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oops("date: error: gettimeofday");
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if (dflag)
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outz.tz_dsttime = tz.tz_dsttime;
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tz.tz_dsttime = dsttime;
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if (tflag)
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outz.tz_minuteswest = tz.tz_minuteswest;
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if (settimeofday((struct timeval *) NULL, &outz) != 0)
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tz.tz_minuteswest = minuteswest;
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if (settimeofday((struct timeval *) NULL, &tz) != 0)
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oops("date: error: settimeofday");
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#else /* !defined DST_NONE */
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(void) fprintf(stderr,
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"date: warning: kernel doesn't keep -d/-t information, option ignored\n");
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#endif /* !defined DST_NONE */
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}
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#endif /* defined D_OR_T_OPTION */
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if (value == NULL)
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display(format);
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reset(t, nflag);
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checkfinal(value, dousg, t, now);
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display(format);
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/* gcc -Wall pacifier */
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for ( ; ; )
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;
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}
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static void
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dogmt()
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{
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register char ** saveenv;
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static char * fakeenv[] = { "TZ=GMT0", NULL };
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saveenv = environ;
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environ = fakeenv;
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tzset();
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environ = saveenv;
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}
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static void
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reset(t, nflag)
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time_t t;
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int nflag;
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{
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register char * username;
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#ifdef DST_NONE
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static struct timeval tv; /* static so tv_usec is 0 */
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#endif /* defined DST_NONE */
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#ifdef EBUG
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return;
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#endif
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username = getlogin();
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if (username == NULL || *username == '\0') /* single-user or no tty */
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username = "root";
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@ -417,14 +404,12 @@ char * argv[];
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if (nflag || !netsettime(tv))
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#endif /* defined TSP_SETDATE */
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{
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#ifndef EBUG
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logwtmp(OTIME_MSG, TIME_USER, "");
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if (settimeofday(&tv, (struct timezone *) NULL) == 0) {
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logwtmp(NTIME_MSG, TIME_USER, "");
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syslog(LOG_AUTH | LOG_NOTICE, "date set by %s",
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username);
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} else oops("date: error: settimeofday");
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#endif /* !defined EBUG */
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}
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#else /* !defined DST_NONE */
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logwtmp(OTIME_MSG, TIME_USER, "");
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@ -432,13 +417,6 @@ char * argv[];
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logwtmp(NTIME_MSG, TIME_USER, "");
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else oops("date: error: stime");
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#endif /* !defined DST_NONE */
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checkfinal(value, convtype, t);
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display(format);
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/* gcc -Wall pacifier */
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for ( ; ; )
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;
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}
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static void
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@ -486,13 +464,16 @@ char * string;
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}
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static void
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iffy(thist, thatt)
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iffy(thist, thatt, value, reason)
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time_t thist;
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time_t thatt;
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char * value;
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char * reason;
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{
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struct tm tm;
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(void) fprintf(stderr, "date: error: ambiguous time. ");
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(void) fprintf(stderr, "date: warning: ambiguous time \"%s\", %s.\n",
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value, reason);
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tm = *gmtime(&thist);
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(void) fprintf(stderr, "Time was set as if you used\n");
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/*
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@ -751,14 +732,12 @@ register struct tm * btmp;
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** Check for iffy input.
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*/
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#ifndef USG_INPUT
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/*ARGSUSED*/
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#endif /* defined USG_INPUT */
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static void
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checkfinal(value, convtype, t)
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checkfinal(value, didusg, t, oldnow)
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char * value;
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int convtype;
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int didusg;
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time_t t;
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time_t oldnow;
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{
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time_t othert;
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struct tm tm;
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@ -766,14 +745,12 @@ time_t t;
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register int pass;
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register long offset;
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|
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#ifdef USG_INPUT
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/*
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** If USG_INPUT is defined, check for USG/BSD ambiguity.
|
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** See if there's both a USG and a BSD interpretation.
|
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*/
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othert = convert(value, !convtype, t);
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othert = convert(value, !didusg, oldnow);
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if (othert != -1 && othert != t)
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iffy(t, othert);
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#endif /* defined USG_INPUT */
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iffy(t, othert, value, "year could be at start or end");
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/*
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** See if there's both a DST and a STD version.
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*/
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@ -782,7 +759,8 @@ time_t t;
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othertm.tm_isdst = !tm.tm_isdst;
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othert = mktime(&tm);
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if (othert != -1 && comptm(&tm, &othertm))
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iffy(t, othert);
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iffy(t, othert, value,
|
||||
"both standard and summer time versions exist");
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/*
|
||||
** Final check.
|
||||
**
|
||||
@ -811,7 +789,9 @@ time_t t;
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else othert = t - 60 * offset;
|
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othertm = *localtime(&othert);
|
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if (comptm(&tm, &othertm) == 0)
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iffy(t, othert);
|
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iffy(t, othert, value,
|
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"multiple same-type times exist");
|
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}
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}
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@ -822,98 +802,90 @@ time_t t;
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||||
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#define ATOI2(ar) (ar[0] - '0') * 10 + (ar[1] - '0'); ar += 2;
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|
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#ifndef USG_INPUT
|
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/*ARGSUSED*/
|
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#endif /* !defined USG_INPUT */
|
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static time_t
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convert(format, dousg, t)
|
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register char * format;
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convert(value, dousg, t)
|
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register char * value;
|
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int dousg;
|
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time_t t;
|
||||
{
|
||||
register char * cp;
|
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register char * endp;
|
||||
register int i;
|
||||
register int year;
|
||||
register int cent, year_in_cent, month, hour, day, mins, secs;
|
||||
struct tm tm, outtm;
|
||||
time_t outt;
|
||||
|
||||
cp = format;
|
||||
#ifndef USG_INPUT
|
||||
if (dousg)
|
||||
return -1;
|
||||
#endif /* !defined USG_INPUT */
|
||||
|
||||
tm = *localtime(&t);
|
||||
endp = strchr(format, '.');
|
||||
cent = (tm.tm_year + TM_YEAR_BASE) / 100;
|
||||
year_in_cent = (tm.tm_year + TM_YEAR_BASE) - cent * 100;
|
||||
month = tm.tm_mon + 1;
|
||||
day = tm.tm_mday;
|
||||
hour = tm.tm_hour;
|
||||
mins = tm.tm_min;
|
||||
|
||||
endp = strchr(value, '.');
|
||||
if (endp == NULL) {
|
||||
endp = strchr(format, '\0');
|
||||
tm.tm_sec = 0;
|
||||
endp = strchr(value, '\0');
|
||||
secs = 0;
|
||||
} else {
|
||||
cp = endp + 1;
|
||||
if (strlen(cp) != 2)
|
||||
wildinput("time", format,
|
||||
wildinput("time", value,
|
||||
"seconds part is not two characters");
|
||||
if (!isdigit(cp[1]) || !isdigit(cp[2]))
|
||||
wildinput("time", format,
|
||||
wildinput("time", value,
|
||||
"seconds part contains a nondigit");
|
||||
tm.tm_sec = ATOI2(cp);
|
||||
secs = ATOI2(cp);
|
||||
}
|
||||
for (cp = format; cp < endp; ++cp)
|
||||
|
||||
for (cp = value; cp < endp; ++cp)
|
||||
if (!isdigit(*cp))
|
||||
wildinput("time", format,
|
||||
wildinput("time", value,
|
||||
"main part contains a nondigit");
|
||||
cp = format;
|
||||
|
||||
cp = value;
|
||||
switch (endp - cp) {
|
||||
default:
|
||||
wildinput("time", format, "main part is wrong length");
|
||||
wildinput("time", value, "main part is wrong length");
|
||||
case 12: /* yyyymmddhhmm */
|
||||
cent = ATOI2(cp);
|
||||
year_in_cent = ATOI2(cp);
|
||||
/* fall through to. . . */
|
||||
case 8: /* mmddhhmm */
|
||||
tm.tm_mon = ATOI2(cp);
|
||||
--tm.tm_mon;
|
||||
month = ATOI2(cp);
|
||||
/* fall through to. . . */
|
||||
case 6: /* ddhhmm */
|
||||
tm.tm_mday = ATOI2(cp);
|
||||
day = ATOI2(cp);
|
||||
/* fall through to. . . */
|
||||
case 4: /* hhmm */
|
||||
tm.tm_hour = ATOI2(cp);
|
||||
tm.tm_min = ATOI2(cp);
|
||||
hour = ATOI2(cp);
|
||||
mins = ATOI2(cp);
|
||||
break;
|
||||
case 10: /* Ulp! yymmddhhmm or mmddhhmmyy */
|
||||
#ifdef USG_INPUT
|
||||
if (dousg) {
|
||||
tm.tm_mon = ATOI2(cp);
|
||||
--tm.tm_mon;
|
||||
tm.tm_mday = ATOI2(cp);
|
||||
tm.tm_hour = ATOI2(cp);
|
||||
tm.tm_min = ATOI2(cp);
|
||||
|
||||
year = tm.tm_year + TM_YEAR_BASE;
|
||||
year -= year % 100;
|
||||
year += ATOI2(cp);
|
||||
tm.tm_year = year - TM_YEAR_BASE;
|
||||
|
||||
break;
|
||||
case 10:
|
||||
if (!dousg) {
|
||||
year_in_cent = ATOI2(cp);
|
||||
}
|
||||
month = ATOI2(cp);
|
||||
day = ATOI2(cp);
|
||||
hour = ATOI2(cp);
|
||||
mins = ATOI2(cp);
|
||||
if (dousg) {
|
||||
year_in_cent = ATOI2(cp);
|
||||
}
|
||||
#endif /* defined USG_INPUT */
|
||||
year = tm.tm_year + TM_YEAR_BASE;
|
||||
year -= year % 100;
|
||||
year += ATOI2(cp);
|
||||
tm.tm_year = year - TM_YEAR_BASE;
|
||||
|
||||
tm.tm_mon = ATOI2(cp);
|
||||
--tm.tm_mon;
|
||||
tm.tm_mday = ATOI2(cp);
|
||||
tm.tm_hour = ATOI2(cp);
|
||||
tm.tm_min = ATOI2(cp);
|
||||
|
||||
break;
|
||||
case 12: /* yyyymmddhhmm--BSD wins in the 21st century */
|
||||
year = ATOI2(cp);
|
||||
year *= 100;
|
||||
year += ATOI2(cp);
|
||||
tm.tm_year = year - TM_YEAR_BASE;
|
||||
tm.tm_mon = ATOI2(cp);
|
||||
--tm.tm_mon;
|
||||
tm.tm_mday = ATOI2(cp);
|
||||
tm.tm_hour = ATOI2(cp);
|
||||
tm.tm_min = ATOI2(cp);
|
||||
break;
|
||||
}
|
||||
|
||||
tm.tm_year = cent * 100 + year_in_cent - TM_YEAR_BASE;
|
||||
tm.tm_mon = month - 1;
|
||||
tm.tm_mday = day;
|
||||
tm.tm_hour = hour;
|
||||
tm.tm_min = mins;
|
||||
tm.tm_sec = secs;
|
||||
tm.tm_isdst = -1;
|
||||
outtm = tm;
|
||||
outt = mktime(&outtm);
|
||||
|
||||
Reference in New Issue
Block a user