add seconds(1) command
This commit is contained in:
cinap_lenrek
parent
b5565b0403
commit
f5dd576a50
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@ -11,3 +11,6 @@ of each
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.IR file .
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.SH SOURCE
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.B /sys/src/cmd/mtime.c
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.SH SEE ALSO
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.IR du (1),
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.IR seconds (1)
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48
sys/man/1/seconds
Normal file
48
sys/man/1/seconds
Normal file
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@ -0,0 +1,48 @@
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.TH SECONDS 1
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.SH NAME
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seconds \- convert human-readable date (and time) to seconds since epoch
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.SH SYNOPSIS
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.B seconds
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.I date
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\&...
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.SH DESCRIPTION
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.I Seconds
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prints the number of seconds since 1 Jan 1970
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corresponding to one or more human-readable
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.IR date s.
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Each
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.I date
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must be
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.I one
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argument;
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it will usually be necessary to enclose it in quotes.
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.PP
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.I Seconds
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accepts a somewhat wider range of input than just output from
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.IR date (1).
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The main requirement is that the date must be fully specified,
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with a day of month, month and year
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in any order.
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The month must be an English name (or abbreviation),
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not a number, and the year must contain 4 digits.
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Unambiguous time-zone names are understood (i.e., not
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.LR IST )
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or time zones may be written as
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.IR ±hhmm .
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Case is ignored.
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.SH EXAMPLES
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Print the names of all files under
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.L \&.
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modified since the start of 23 May 2011.
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.IP
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.EX
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du -ta | awk '$1 >= '^`{seconds '23 may 2011'}^' {print $2}'
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.EE
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.SH SEE ALSO
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.IR date (1),
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.IR du (1),
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.IR mtime (1),
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.IR ctime (2)
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.SH BUGS
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All-numeric dates, popular in the USA, are simply ambiguous,
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more so if the year is truncated to 2 digits.
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472
sys/src/cmd/seconds.c
Normal file
472
sys/src/cmd/seconds.c
Normal file
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@ -0,0 +1,472 @@
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/*
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* seconds absolute_date ... - convert absolute_date to seconds since epoch
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*/
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#include <u.h>
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#include <libc.h>
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#include <ctype.h>
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typedef ulong Time;
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enum {
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AM, PM, HR24,
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/* token types */
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Month = 1,
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Year,
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Day,
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Timetok,
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Tz,
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Dtz,
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Ignore,
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Ampm,
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Maxtok = 6, /* only this many chars are stored in datetktbl */
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Maxdateflds = 25,
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};
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/*
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* macros for squeezing values into low 7 bits of "value".
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* all timezones we care about are divisible by 10, and the largest value
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* (780) when divided is 78.
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*/
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#define TOVAL(tp, v) ((tp)->value = (v) / 10)
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#define FROMVAL(tp) ((tp)->value * 10) /* uncompress */
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/* keep this struct small since we have an array of them */
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typedef struct {
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char token[Maxtok];
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char type;
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schar value;
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} Datetok;
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int dtok_numparsed;
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/* forwards */
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Datetok *datetoktype(char *s, int *bigvalp);
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static Datetok datetktbl[];
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static unsigned szdatetktbl;
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/* parse 1- or 2-digit number, advance *cpp past it */
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static int
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eatnum(char **cpp)
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{
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int c, x;
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char *cp;
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cp = *cpp;
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c = *cp;
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if (!isascii(c) || !isdigit(c))
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return -1;
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x = c - '0';
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c = *++cp;
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if (isascii(c) && isdigit(c)) {
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x = 10*x + c - '0';
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cp++;
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}
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*cpp = cp;
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return x;
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}
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/* return -1 on failure */
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int
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parsetime(char *time, Tm *tm)
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{
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tm->hour = eatnum(&time);
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if (tm->hour == -1 || *time++ != ':')
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return -1; /* only hour; too short */
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tm->min = eatnum(&time);
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if (tm->min == -1)
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return -1;
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if (*time++ != ':') {
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tm->sec = 0;
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return 0; /* no seconds; okay */
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}
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tm->sec = eatnum(&time);
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if (tm->sec == -1)
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return -1;
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/* this may be considered too strict. garbage at end of time? */
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return *time == '\0' || isascii(*time) && isspace(*time)? 0: -1;
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}
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/*
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* try to parse pre-split timestr in fields as an absolute date
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*/
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int
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tryabsdate(char **fields, int nf, Tm *now, Tm *tm)
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{
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int i, mer = HR24, bigval = -1;
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long flg = 0, ty;
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char *p;
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char upzone[32];
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Datetok *tp;
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now = localtime(time(0)); /* default to local time (zone) */
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tm->tzoff = now->tzoff;
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strncpy(tm->zone, now->zone, sizeof tm->zone);
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tm->mday = tm->mon = tm->year = -1; /* mandatory */
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tm->hour = tm->min = tm->sec = 0;
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dtok_numparsed = 0;
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for (i = 0; i < nf; i++) {
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if (fields[i][0] == '\0')
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continue;
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tp = datetoktype(fields[i], &bigval);
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ty = (1L << tp->type) & ~(1L << Ignore);
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if (flg & ty)
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return -1; /* repeated type */
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flg |= ty;
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switch (tp->type) {
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case Year:
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tm->year = bigval;
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if (tm->year < 1970 || tm->year > 2106)
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return -1; /* can't represent in ulong */
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/* convert 4-digit year to 1900 origin */
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if (tm->year >= 1900)
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tm->year -= 1900;
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break;
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case Day:
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tm->mday = bigval;
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break;
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case Month:
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tm->mon = tp->value - 1; /* convert to zero-origin */
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break;
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case Timetok:
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if (parsetime(fields[i], tm) < 0)
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return -1;
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break;
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case Dtz:
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case Tz:
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tm->tzoff = FROMVAL(tp);
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/* tm2sec needs the name in upper case */
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strcpy(upzone, fields[i]);
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for (p = upzone; *p; p++)
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if (isascii(*p) && islower(*p))
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*p = toupper(*p);
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strncpy(tm->zone, upzone, sizeof tm->zone);
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break;
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case Ignore:
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break;
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case Ampm:
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mer = tp->value;
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break;
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default:
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return -1; /* bad token type: CANTHAPPEN */
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}
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}
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if (tm->year == -1 || tm->mon == -1 || tm->mday == -1)
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return -1; /* missing component */
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if (mer == PM)
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tm->hour += 12;
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return 0;
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}
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int
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prsabsdate(char *timestr, Tm *now, Tm *tm)
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{
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int nf;
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char *fields[Maxdateflds];
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static char delims[] = "- \t\n/,";
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nf = gettokens(timestr, fields, nelem(fields), delims+1);
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if (nf > nelem(fields))
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return -1;
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if (tryabsdate(fields, nf, now, tm) < 0) {
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char *p = timestr;
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/*
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* could be a DEC-date; glue it all back together, split it
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* with dash as a delimiter and try again. Yes, this is a
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* hack, but so are DEC-dates.
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*/
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while (--nf > 0) {
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while (*p++ != '\0')
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;
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p[-1] = ' ';
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}
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nf = gettokens(timestr, fields, nelem(fields), delims);
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if (nf > nelem(fields) || tryabsdate(fields, nf, now, tm) < 0)
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return -1;
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}
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return 0;
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}
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int
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validtm(Tm *tm)
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{
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if (tm->year < 0 || tm->mon < 0 || tm->mon > 11 ||
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tm->mday < 1 || tm->hour < 0 || tm->hour >= 24 ||
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tm->min < 0 || tm->min > 59 ||
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tm->sec < 0 || tm->sec > 61) /* allow 2 leap seconds */
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return 0;
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return 1;
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}
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Time
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seconds(char *timestr)
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{
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Tm date;
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memset(&date, 0, sizeof date);
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if (prsabsdate(timestr, localtime(time(0)), &date) < 0)
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return -1;
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return validtm(&date)? tm2sec(&date): -1;
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}
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int
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convert(char *timestr)
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{
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char *copy;
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Time tstime;
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copy = strdup(timestr);
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if (copy == nil)
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sysfatal("out of memory");
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tstime = seconds(copy);
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free(copy);
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if (tstime == -1) {
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fprint(2, "%s: `%s' not a valid date\n", argv0, timestr);
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return 1;
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}
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print("%lud\n", tstime);
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return 0;
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}
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static void
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usage(void)
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{
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fprint(2, "usage: %s date-time ...\n", argv0);
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exits("usage");
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}
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void
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main(int argc, char **argv)
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{
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int i, sts;
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sts = 0;
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ARGBEGIN{
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default:
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usage();
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}ARGEND
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if (argc == 0)
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usage();
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for (i = 0; i < argc; i++)
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sts |= convert(argv[i]);
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exits(sts != 0? "bad": 0);
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}
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/*
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* Binary search -- from Knuth (6.2.1) Algorithm B. Special case like this
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* is WAY faster than the generic bsearch().
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*/
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Datetok *
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datebsearch(char *key, Datetok *base, unsigned nel)
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{
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int cmp;
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Datetok *last = base + nel - 1, *pos;
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while (last >= base) {
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pos = base + ((last - base) >> 1);
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cmp = key[0] - pos->token[0];
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if (cmp == 0) {
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cmp = strncmp(key, pos->token, Maxtok);
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if (cmp == 0)
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return pos;
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}
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if (cmp < 0)
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last = pos - 1;
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else
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base = pos + 1;
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}
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return 0;
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}
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Datetok *
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datetoktype(char *s, int *bigvalp)
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{
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char *cp = s;
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char c = *cp;
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static Datetok t;
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Datetok *tp = &t;
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if (isascii(c) && isdigit(c)) {
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int len = strlen(cp);
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if (len > 3 && (cp[1] == ':' || cp[2] == ':'))
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tp->type = Timetok;
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else {
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if (bigvalp != nil)
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*bigvalp = atoi(cp); /* won't fit in tp->value */
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if (len == 4)
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tp->type = Year;
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else if (++dtok_numparsed == 1)
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tp->type = Day;
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else
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tp->type = Year;
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}
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} else if (c == '-' || c == '+') {
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int val = atoi(cp + 1);
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int hr = val / 100;
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int min = val % 100;
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val = hr*60 + min;
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TOVAL(tp, c == '-'? -val: val);
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tp->type = Tz;
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} else {
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char lowtoken[Maxtok+1];
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char *ltp = lowtoken, *endltp = lowtoken+Maxtok;
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/* copy to lowtoken to avoid modifying s */
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while ((c = *cp++) != '\0' && ltp < endltp)
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*ltp++ = (isascii(c) && isupper(c)? tolower(c): c);
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*ltp = '\0';
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tp = datebsearch(lowtoken, datetktbl, szdatetktbl);
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if (tp == nil) {
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tp = &t;
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tp->type = Ignore;
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}
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}
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return tp;
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}
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/*
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* to keep this table reasonably small, we divide the lexval for Tz and Dtz
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* entries by 10 and truncate the text field at MAXTOKLEN characters.
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* the text field is not guaranteed to be NUL-terminated.
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*/
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static Datetok datetktbl[] = {
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/* text token lexval */
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"acsst", Dtz, 63, /* Cent. Australia */
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"acst", Tz, 57, /* Cent. Australia */
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"adt", Dtz, -18, /* Atlantic Daylight Time */
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"aesst", Dtz, 66, /* E. Australia */
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"aest", Tz, 60, /* Australia Eastern Std Time */
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"ahst", Tz, 60, /* Alaska-Hawaii Std Time */
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"am", Ampm, AM,
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"apr", Month, 4,
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"april", Month, 4,
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"ast", Tz, -24, /* Atlantic Std Time (Canada) */
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"at", Ignore, 0, /* "at" (throwaway) */
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"aug", Month, 8,
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"august", Month, 8,
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"awsst", Dtz, 54, /* W. Australia */
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"awst", Tz, 48, /* W. Australia */
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"bst", Tz, 6, /* British Summer Time */
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"bt", Tz, 18, /* Baghdad Time */
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"cadt", Dtz, 63, /* Central Australian DST */
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"cast", Tz, 57, /* Central Australian ST */
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"cat", Tz, -60, /* Central Alaska Time */
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"cct", Tz, 48, /* China Coast */
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"cdt", Dtz, -30, /* Central Daylight Time */
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"cet", Tz, 6, /* Central European Time */
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"cetdst", Dtz, 12, /* Central European Dayl.Time */
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"cst", Tz, -36, /* Central Standard Time */
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"dec", Month, 12,
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"decemb", Month, 12,
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"dnt", Tz, 6, /* Dansk Normal Tid */
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"dst", Ignore, 0,
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"east", Tz, -60, /* East Australian Std Time */
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"edt", Dtz, -24, /* Eastern Daylight Time */
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"eet", Tz, 12, /* East. Europe, USSR Zone 1 */
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"eetdst", Dtz, 18, /* Eastern Europe */
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"est", Tz, -30, /* Eastern Standard Time */
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"feb", Month, 2,
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"februa", Month, 2,
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"fri", Ignore, 5,
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"friday", Ignore, 5,
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"fst", Tz, 6, /* French Summer Time */
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"fwt", Dtz, 12, /* French Winter Time */
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"gmt", Tz, 0, /* Greenwish Mean Time */
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"gst", Tz, 60, /* Guam Std Time, USSR Zone 9 */
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"hdt", Dtz, -54, /* Hawaii/Alaska */
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"hmt", Dtz, 18, /* Hellas ? ? */
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"hst", Tz, -60, /* Hawaii Std Time */
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"idle", Tz, 72, /* Intl. Date Line, East */
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"idlw", Tz, -72, /* Intl. Date Line, West */
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"ist", Tz, 12, /* Israel */
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"it", Tz, 22, /* Iran Time */
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"jan", Month, 1,
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"januar", Month, 1,
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"jst", Tz, 54, /* Japan Std Time,USSR Zone 8 */
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"jt", Tz, 45, /* Java Time */
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"jul", Month, 7,
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"july", Month, 7,
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"jun", Month, 6,
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"june", Month, 6,
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"kst", Tz, 54, /* Korea Standard Time */
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"ligt", Tz, 60, /* From Melbourne, Australia */
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"mar", Month, 3,
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"march", Month, 3,
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"may", Month, 5,
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"mdt", Dtz, -36, /* Mountain Daylight Time */
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"mest", Dtz, 12, /* Middle Europe Summer Time */
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"met", Tz, 6, /* Middle Europe Time */
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"metdst", Dtz, 12, /* Middle Europe Daylight Time*/
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"mewt", Tz, 6, /* Middle Europe Winter Time */
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"mez", Tz, 6, /* Middle Europe Zone */
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"mon", Ignore, 1,
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"monday", Ignore, 1,
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"mst", Tz, -42, /* Mountain Standard Time */
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"mt", Tz, 51, /* Moluccas Time */
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"ndt", Dtz, -15, /* Nfld. Daylight Time */
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"nft", Tz, -21, /* Newfoundland Standard Time */
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"nor", Tz, 6, /* Norway Standard Time */
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"nov", Month, 11,
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"novemb", Month, 11,
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"nst", Tz, -21, /* Nfld. Standard Time */
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"nt", Tz, -66, /* Nome Time */
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"nzdt", Dtz, 78, /* New Zealand Daylight Time */
|
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"nzst", Tz, 72, /* New Zealand Standard Time */
|
||||
"nzt", Tz, 72, /* New Zealand Time */
|
||||
"oct", Month, 10,
|
||||
"octobe", Month, 10,
|
||||
"on", Ignore, 0, /* "on" (throwaway) */
|
||||
"pdt", Dtz, -42, /* Pacific Daylight Time */
|
||||
"pm", Ampm, PM,
|
||||
"pst", Tz, -48, /* Pacific Standard Time */
|
||||
"sadt", Dtz, 63, /* S. Australian Dayl. Time */
|
||||
"sast", Tz, 57, /* South Australian Std Time */
|
||||
"sat", Ignore, 6,
|
||||
"saturd", Ignore, 6,
|
||||
"sep", Month, 9,
|
||||
"sept", Month, 9,
|
||||
"septem", Month, 9,
|
||||
"set", Tz, -6, /* Seychelles Time ?? */
|
||||
"sst", Dtz, 12, /* Swedish Summer Time */
|
||||
"sun", Ignore, 0,
|
||||
"sunday", Ignore, 0,
|
||||
"swt", Tz, 6, /* Swedish Winter Time */
|
||||
"thu", Ignore, 4,
|
||||
"thur", Ignore, 4,
|
||||
"thurs", Ignore, 4,
|
||||
"thursd", Ignore, 4,
|
||||
"tue", Ignore, 2,
|
||||
"tues", Ignore, 2,
|
||||
"tuesda", Ignore, 2,
|
||||
"ut", Tz, 0,
|
||||
"utc", Tz, 0,
|
||||
"wadt", Dtz, 48, /* West Australian DST */
|
||||
"wast", Tz, 42, /* West Australian Std Time */
|
||||
"wat", Tz, -6, /* West Africa Time */
|
||||
"wdt", Dtz, 54, /* West Australian DST */
|
||||
"wed", Ignore, 3,
|
||||
"wednes", Ignore, 3,
|
||||
"weds", Ignore, 3,
|
||||
"wet", Tz, 0, /* Western Europe */
|
||||
"wetdst", Dtz, 6, /* Western Europe */
|
||||
"wst", Tz, 48, /* West Australian Std Time */
|
||||
"ydt", Dtz, -48, /* Yukon Daylight Time */
|
||||
"yst", Tz, -54, /* Yukon Standard Time */
|
||||
"zp4", Tz, -24, /* GMT +4 hours. */
|
||||
"zp5", Tz, -30, /* GMT +5 hours. */
|
||||
"zp6", Tz, -36, /* GMT +6 hours. */
|
||||
};
|
||||
static unsigned szdatetktbl = nelem(datetktbl);
|
||||
Loading…
Reference in a new issue