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Diffstat (limited to 'src/lib/libcmd/date.c')
| -rw-r--r-- | src/lib/libcmd/date.c | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/src/lib/libcmd/date.c b/src/lib/libcmd/date.c new file mode 100644 index 0000000..3f9a303 --- /dev/null +++ b/src/lib/libcmd/date.c @@ -0,0 +1,515 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1992-2012 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped +/* + * Glenn Fowler + * AT&T Research + * + * date -- set/display date + */ + +static const char usage[] = +"[-?\n@(#)$Id: date (AT&T Research) 2011-01-27 $\n]" +USAGE_LICENSE +"[+NAME?date - set/list/convert dates]" +"[+DESCRIPTION?\bdate\b sets the current date and time (with appropriate" +" privilege), lists the current date or file dates, or converts" +" dates.]" +"[+?Most common \adate\a forms are recognized, including those for" +" \bcrontab\b(1), \bls\b(1), \btouch\b(1), and the default" +" output from \bdate\b itself.]" +"[+?If the \adate\a operand consists of 4, 6, 8, 10 or 12 digits followed" +" by an optional \b.\b and two digits then it is interpreted as:" +" \aHHMM.SS\a, \addHHMM.SS\a, \ammddHHMM.SS\a, \ammddHHMMyy.SS\a or" +" \ayymmddHHMM.SS\a, or \ammddHHMMccyy.SS\a or \accyymmddHHMM.SS\a." +" Conflicting standards and practice allow a leading or trailing" +" 2 or 4 digit year for the 10 and 12 digit forms; the X/Open trailing" +" form is used to disambiguate (\btouch\b(1) uses the leading form.)" +" Avoid the 10 digit form to avoid confusion. The digit fields are:]{" +" [+cc?Century - 1, 19-20.]" +" [+yy?Year in century, 00-99.]" +" [+mm?Month, 01-12.]" +" [+dd?Day of month, 01-31.]" +" [+HH?Hour, 00-23.]" +" [+MM?Minute, 00-59.]" +" [+SS?Seconds, 00-60.]" +"}" +"[+?If more than one \adate\a operand is specified then:]{" +" [+1.?Each operand sets the reference date for the next" +" operand.]" +" [+2.?The date is listed for each operand.]" +" [+3.?The system date is not set.]" +"}" + +"[a:access-time|atime?List file argument access times.]" +"[c:change-time|ctime?List file argument change times.]" +"[d:date?Use \adate\a as the current date and do not set the system" +" clock.]:[date]" +"[e:epoch?Output the date in seconds since the epoch." +" Equivalent to \b--format=%s\b.]" +"[E:elapsed?Interpret pairs of arguments as start and stop dates, sum the" +" differences between all pairs, and list the result as a" +" \bfmtelapsed\b(3) elapsed time on the standard output. If there are" +" an odd number of arguments then the last time argument is differenced" +" with the current time.]" +"[f:format?Output the date according to the \bstrftime\b(3) \aformat\a." +" For backwards compatibility, a first argument of the form" +" \b+\b\aformat\a is equivalent to \b-f\b format." +" \aformat\a is in \bprintf\b(3) style, where %\afield\a names" +" a fixed size field, zero padded if necessary," +" and \\\ac\a and \\\annn\a sequences are as in C. Invalid" +" %\afield\a specifications and all other characters are copied" +" without change. \afield\a may be preceded by \b%-\b to turn off" +" padding or \b%_\b to pad with space, otherwise numeric fields" +" are padded with \b0\b and string fields are padded with space." +" \afield\a may also be preceded by \bE\b for alternate era" +" representation or \bO\b for alternate digit representation (if" +" supported by the current locale.) Finally, an integral \awidth\a" +" preceding \afield\a truncates the field to \awidth\a characters." +" The fields are:]:[format]{" +" [+%?% character]" +" [+a?abbreviated weekday name]" +" [+A?full weekday name]" +" [+b?abbreviated month name]" +" [+B?full month name]" +" [+c?\bctime\b(3) style date without the trailing newline]" +" [+C?2-digit century]" +" [+d?day of month number]" +" [+D?date as \amm/dd/yy\a]" +" [+e?blank padded day of month number]" +" [+f?locale default override date format]" +" [+F?%ISO 8601:2000 standard date format; equivalent to Y-%m-%d]" +" [+g?\bls\b(1) \b-l\b recent date with \ahh:mm\a]" +" [+G?\bls\b(1) \b-l\b distant date with \ayyyy\a]" +" [+h?abbreviated month name]" +" [+H?24-hour clock hour]" +" [+i?international \bdate\b(1) date with time zone type name]" +" [+I?12-hour clock hour]" +" [+j?1-offset Julian date]" +" [+J?0-offset Julian date]" +" [+k?\bdate\b(1) style date]" +" [+K?all numeric date; equivalent to \b%Y-%m-%d+%H:%M:%S\b; \b%_[EO]]K\b for space separator, %OK adds \b.%N\b, \b%EK\b adds \b%.N%z\b, \b%_EK\b adds \b.%N %z\b]" +" [+l?\bls\b(1) \b-l\b date; equivalent to \b%Q/%g/%G/\b]" +" [+L?locale default date format]" +" [+m?month number]" +" [+M?minutes]" +" [+n?newline character]" +" [+N?nanoseconds 000000000-999999999]" +" [+p?meridian (e.g., \bAM\b or \bPM\b)]" +" [+q?time zone type name (nation code)]" +" [+Q?\a<del>recent<del>distant<del>\a: \a<del>\a is a unique" +" delimter character; \arecent\a format for recent" +" dates, \adistant\a format otherwise]" +" [+r?12-hour time as \ahh:mm:ss meridian\a]" +" [+R?24-hour time as \ahh:mm\a]" +" [+s?number of seconds since the epoch; \a.prec\a preceding" +" \bs\b appends \aprec\a nanosecond digits, \b9\b if" +" \aprec\a is omitted]" +" [+S?seconds 00-60]" +" [+t?tab character]" +" [+T?24-hour time as \ahh:mm:ss\a]" +" [+u?weekday number 1(Monday)-7]" +" [+U?week number with Sunday as the first day]" +" [+V?ISO week number (i18n is \afun\a)]" +" [+w?weekday number 0(Sunday)-6]" +" [+W?week number with Monday as the first day]" +" [+x?locale date style that includes month, day and year]" +" [+X?locale time style that includes hours and minutes]" +" [+y?2-digit year (you'll be sorry)]" +" [+Y?4-digit year]" +" [+z?time zone \aSHHMM\a west of GMT offset where S is" +" \b+\b or \b-\b, use pad _ for \aSHH:MM\a]" +" [+Z?time zone name]" +" [+=[=]][-+]]flag?set (default or +) or clear (-) \aflag\a" +" for the remainder of \aformat\a, or for the remainder" +" of the process if \b==\b is specified. \aflag\a may be:]{" +" [+l?enable leap second adjustments]" +" [+n?convert \b%S\b as \b%S.%N\b]" +" [+u?UTC time zone]" +" }" +" [+#?equivalent to %s]" +" [+??alternate?use \aalternate\a format if a default format" +" override has not been specified, e.g., \bls\b(1) uses" +" \"%?%l\"; export TM_OPTIONS=\"format='\aoverride\a'\"" +" to override the default]" +"}" +"[i:incremental|adjust?Set the system time in incrementatl adjustments to" +" avoid complete time shift shock. Negative adjustments still maintain" +" monotonic increasing time. Not available on all systems.]" +"[L:last?List only the last time for multiple \adate\a operands.]" +"[l:leap-seconds?Include leap seconds in time calculations. Leap seconds" +" after the ast library release date are not accounted for.]" +"[m:modify-time|mtime?List file argument modify times.]" +"[n!:network?Set network time.]" +"[p:parse?Add \aformat\a to the list of \bstrptime\b(3) parse conversion" +" formats. \aformat\a follows the same conventions as the" +" \b--format\b option, with the addition of these format" +" fields:]:[format]{" +" [+|?If the format failed before this point then restart" +" the parse with the remaining format.]" +" [+&?Call the \btmdate\b(3) heuristic parser. This is" +" is the default when \b--parse\b is omitted.]" +"}" +"[R:rfc-2822?List date and time in RFC 2822 format " + "(%a, %-e %h %Y %H:%M:%S %z).]" +"[T:rfc-3339?List date and time in RFC 3339 format according to " + "\atype\a:]:[type]" + "{" + "[d:date?(%Y-%m-%d)]" + "[s:seconds?(%Y-%m-%d %H:%M:%S%_z)]" + "[n:ns|nanoseconds?(%Y-%m-%d %H:%M:%S.%N%_z)]" + "}" +"[s:show?Show the date without setting the system time.]" +"[u:utc|gmt|zulu|universal?Output dates in \acoordinated universal time\a (UTC).]" +"[U:unelapsed?Interpret each argument as \bfmtelapsed\b(3) elapsed" +" time and list the \bstrelapsed\b(3) 1/\ascale\a seconds.]#[scale]" +"[z:list-zones?List the known time zone table and exit. The table columns" +" are: country code, standard zone name, savings time zone name," +" minutes west of \bUTC\b, and savings time minutes offset. Blank" +" or empty entries are listed as \b-\b.]" + +"\n" +"\n[ +format | date ... | file ... ]\n" +"\n" + +"[+SEE ALSO?\bcrontab\b(1), \bls\b(1), \btouch\b(1), \bfmtelapsed\b(3)," +" \bstrftime\b(3), \bstrptime\b(3), \btm\b(3)]" +; + +#include <cmd.h> +#include <ls.h> +#include <proc.h> +#include <tmx.h> +#include <times.h> + +typedef struct Fmt +{ + struct Fmt* next; + char* format; +} Fmt_t; + +#ifndef ENOSYS +#define ENOSYS EINVAL +#endif + +/* + * set the system clock + * the standards wimped out here + */ + +static int +settime(Shbltin_t* context, const char* cmd, Time_t now, int adjust, int network) +{ + char* s; + char** argv; + char* args[5]; + char buf[1024]; + + if (!adjust && !network) + return tmxsettime(now); + argv = args; + s = "/usr/bin/date"; + if (!streq(cmd, s) && (!eaccess(s, X_OK) || !eaccess(s+=4, X_OK))) + { + *argv++ = s; + if (streq(astconf("UNIVERSE", NiL, NiL), "att")) + { + tmxfmt(buf, sizeof(buf), "%m%d%H" "%M%Y.%S", now); + if (adjust) + *argv++ = "-a"; + } + else + { + tmxfmt(buf, sizeof(buf), "%Y%m%d%H" "%M.%S", now); + if (network) + *argv++ = "-n"; + if (tm_info.flags & TM_UTC) + *argv++ = "-u"; + } + *argv++ = buf; + *argv = 0; + if (!sh_run(context, argv - args, args)) + return 0; + } + return -1; +} + +/* + * convert s to Time_t with error checking + */ + +static Time_t +convert(register Fmt_t* f, char* s, Time_t now) +{ + char* t; + char* u; + + do + { + now = tmxscan(s, &t, f->format, &u, now, 0); + if (!*t && (!f->format || !*u)) + break; + } while (f = f->next); + if (!f || *t) + error(3, "%s: invalid date specification", f ? t : s); + return now; +} + +int +b_date(int argc, register char** argv, Shbltin_t* context) +{ + register int n; + register char* s; + register Fmt_t* f; + char* t; + unsigned long u; + Time_t now; + Time_t ts; + Time_t te; + Time_t e; + char buf[1024]; + Fmt_t* fmts; + Fmt_t fmt; + struct stat st; + + char* cmd = argv[0]; /* original command path */ + char* format = 0; /* tmxfmt() format */ + char* string = 0; /* date string */ + int elapsed = 0; /* args are start/stop pairs */ + int filetime = 0; /* use this st_ time field */ + int increment = 0; /* incrementally adjust time */ + int last = 0; /* display the last time arg */ + Tm_zone_t* listzones = 0; /* known time zone table */ + int network = 0; /* don't set network time */ + int show = 0; /* show date and don't set */ + int unelapsed = 0; /* fmtelapsed() => strelapsed */ + + cmdinit(argc, argv, context, ERROR_CATALOG, 0); + tm_info.flags = TM_DATESTYLE; + fmts = &fmt; + fmt.format = ""; + fmt.next = 0; + for (;;) + { + switch (optget(argv, usage)) + { + case 'a': + case 'c': + case 'm': + filetime = opt_info.option[1]; + continue; + case 'd': + string = opt_info.arg; + show = 1; + continue; + case 'e': + format = "%s"; + continue; + case 'E': + elapsed = 1; + continue; + case 'f': + format = opt_info.arg; + continue; + case 'i': + increment = 1; + continue; + case 'l': + tm_info.flags |= TM_LEAP; + continue; + case 'L': + last = 1; + continue; + case 'n': + network = 1; + continue; + case 'p': + if (!(f = newof(0, Fmt_t, 1, 0))) + error(ERROR_SYSTEM|3, "out of space [format]"); + f->next = fmts; + f->format = opt_info.arg; + fmts = f; + continue; + case 'R': + format = "%a, %-e %h %Y %H:%M:%S %z"; + continue; + case 's': + show = 1; + continue; + case 'T': + switch (opt_info.num) + { + case 'd': + format = "%Y-%m-%d"; + continue; + case 'n': + format = "%Y-%m-%d %H:%M:%S.%N%_z"; + continue; + case 's': + format = "%Y-%m-%d %H:%M:%S%_z"; + continue; + } + continue; + case 'u': + tm_info.flags |= TM_UTC; + continue; + case 'U': + unelapsed = (int)opt_info.num; + continue; + case 'z': + listzones = tm_data.zone; + continue; + case '?': + error(ERROR_USAGE|4, "%s", opt_info.arg); + continue; + case ':': + error(2, "%s", opt_info.arg); + continue; + } + break; + } + argv += opt_info.index; + if (error_info.errors) + error(ERROR_USAGE|4, "%s", optusage(NiL)); + now = tmxgettime(); + if (listzones) + { + s = "-"; + while (listzones->standard) + { + if (listzones->type) + s = listzones->type; + sfprintf(sfstdout, "%3s %4s %4s %4d %4d\n", s, *listzones->standard ? listzones->standard : "-", listzones->daylight ? listzones->daylight : "-", listzones->west, listzones->dst); + listzones++; + show = 1; + } + } + else if (elapsed) + { + e = 0; + while (s = *argv++) + { + if (!(t = *argv++)) + { + argv--; + t = "now"; + } + ts = convert(fmts, s, now); + te = convert(fmts, t, now); + if (te > ts) + e += te - ts; + else + e += ts - te; + } + sfputr(sfstdout, fmtelapsed((unsigned long)tmxsec(e), 1), '\n'); + show = 1; + } + else if (unelapsed) + { + while (s = *argv++) + { + u = strelapsed(s, &t, unelapsed); + if (*t) + error(3, "%s: invalid elapsed time", s); + sfprintf(sfstdout, "%lu\n", u); + } + show = 1; + } + else if (filetime) + { + if (!*argv) + error(ERROR_USAGE|4, "%s", optusage(NiL)); + n = argv[1] != 0; + while (s = *argv++) + { + if (stat(s, &st)) + error(2, "%s: not found", s); + else + { + switch (filetime) + { + case 'a': + now = tmxgetatime(&st); + break; + case 'c': + now = tmxgetctime(&st); + break; + default: + now = tmxgetmtime(&st); + break; + } + tmxfmt(buf, sizeof(buf), format, now); + if (n) + sfprintf(sfstdout, "%s: %s\n", s, buf); + else + sfprintf(sfstdout, "%s\n", buf); + show = 1; + } + } + } + else + { + if ((s = *argv) && !format && *s == '+') + { + format = s + 1; + argv++; + s = *argv; + } + if (s || (s = string)) + { + if (*argv && string) + error(ERROR_USAGE|4, "%s", optusage(NiL)); + now = convert(fmts, s, now); + if (*argv && (s = *++argv)) + { + show = 1; + do + { + if (!last) + { + tmxfmt(buf, sizeof(buf), format, now); + sfprintf(sfstdout, "%s\n", buf); + } + now = convert(fmts, s, now); + } while (s = *++argv); + } + } + else + show = 1; + if (format || show) + { + tmxfmt(buf, sizeof(buf), format, now); + sfprintf(sfstdout, "%s\n", buf); + } + else if (settime(context, cmd, now, increment, network)) + error(ERROR_SYSTEM|3, "cannot set system time"); + } + while (fmts != &fmt) + { + f = fmts; + fmts = fmts->next; + free(f); + } + tm_info.flags = 0; + if (show && sfsync(sfstdout)) + error(ERROR_system(0), "write error"); + return error_info.errors != 0; +} |