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- #!/usr/local/bin/gawk -f
- # @(#) mlast.gawk 1.5 97/07/11
- # 93/03/14 john h. dubois iii (john@armory.com)
- # 93/12/03 Process last -w /etc/utmp first so that last does not have to
- # search through huge wtmp for users who have been logged in a
- # long time. Sort output to print most recent first.
- # Added command line options.
- # 93/12/19 Use gawk for strftime() and /dev/stderr
- # Removed uninteresting fields from last output & added age field
- # 93/12/31 Added x option
- # 94/01/22 Fixed sorting
- # 94/03/13 Exit 0 from command for gawk. Close all files.
- # 94/04/25 Added l and o options, header
- # 94/05/10 Added Old field
- # 94/06/06 Added L option
- # 95/05/21 Allow option defaults to be given in .mlast
- # 96/01/08 Make all debugging outpout go to /dev/stderr.
- # Changed meaning of t option. Added -number option.
- # Fixed endless loop if read from last fails.
- # 96/01/12 Subtract a minute from 'old'.
- # 96/01/13 Added i option.
- # 96/01/21 Also read $UHOME/.mlast and /etc/default/mlast
- # 96/07/17 Added es options.
- # 96/12/28 Added r option.
- # 97/02/26 Let TTY names be given on command line w/o option letter.
- # 97/07/11 1.5 Added gds options.
-
- BEGIN {
- Name = "mlast"
- Usage = "Usage: " Name " [-dehknorstTx] [-<number>] [-i<login,...>]\n"\
- " [-L<tty,...>] [-g<max-time-gap>] [tty ...]"
- rcFile = ".mlast"
- reportInterval = 100
- ARGC = Opts(Name,Usage,"g>sdnl:L:oti:r&>eThxk",0,
- "~/" rcFile ":$UHOME/" rcFile ":/etc/default/mlast","MAXTIMEGAP,SORTED,"\
- "SHOWDAY,NOSORT,TTYS,IGNORETTYS,NOHEADER,TTYSORT,IGNORENAMES,RUNNING",0,"k")
- if ("h" in Options) {
- printf \
- "%s: show last logins on enabled modem lines.\n"\
- "For each enabled modem line, a line is printed listing, for that TTY: the\n"\
- "last user to log in, the date of the last login, the duration of the last\n"\
- "login, comments (e.g. whether a user is currently logged in on it), the\n"\
- "amount of time that has passed since the last login (Age), and the amount\n"\
- "of time that has passed since the end of the last login, if there is\n"\
- "currently noone logged in on it (Old). Lines are sorted by Age, with the\n"\
- "oldest lines printed first. If any TTY names are given on the command\n"\
- "line, they are reported on instead of the set of enabled TTYs. TTY names\n"\
- "may be given with or without a leading \"/dev/\", with or without a\n"\
- "leading \"tty\", and as either the modem- or non-modem-control name.\n"\
- "Options:\n"\
- "Some of the following options can also be set by assigning values to\n"\
- "variables in a configuration file. Three configuration files are read,\n"\
- "in order: a file named %s in the invoking user's home directory; a file\n"\
- "named %s in the directory specified by the environment variable UHOME\n"\
- "(if it is set); and the file /etc/default/mlast. Variables are assigned\n"\
- "to with the syntax: varname=value or in the case of flags, by simply\n"\
- "putting the indicated variable name in the file without a value.\n"\
- "A variable assigned to in one of these files will override values assigned\n"\
- "to the same variable in one of the files read after it. To turn off an\n"\
- "option and prevent it from being set in a file read later, assign it a\n"\
- "value of 0. e.g. if TTYSORT is set in /etc/default/mlast, TTYSORT=0 in\n"\
- "a %s file will override it. Flag options can be turned off on the\n"\
- "command line by following them immediately with '-', e.g. -n- to turn off\n"\
- "the n option in such a way that it cannot be turned on in a config file.\n"\
- "-e: List enabled modem TTYs, then exit.\n"\
- "-T: Print the names of the TTYs that would be searched for, then exit.\n"\
- "-h: Print this help.\n"\
- "-k: Do not read the configuration files.\n"\
- "-<number>: Process only the last <number> login records in the wtmp file.\n"\
- "-n: Show logins as they are found, with no sorting. This lets output be\n"\
- " seen without waiting a long time for %s to find the wtmp entry\n"\
- " for a modem line that has not been logged into for a long time.\n"\
- " In the configuration file, put NOSORT.\n"\
- "-r: Like -n, but at intervals also reports what lines are still being\n"\
- " searched for to the standard error output. The report is printed when\n"\
- " %d records have been read since the last line was reported on.\n"\
- "-s: Print sorted login records after they have all been found. This is the\n"\
- " default, so this option is only used with -n or -r, which causes the\n"\
- " login records to be printed as they are found, then then printed again\n"\
- " in sorted order after they have all been found. (SORTED)\n"\
- "-d: Each time a new day is encountered in the last-login records, print it\n"\
- " to show how far back login searching has reached. (SHOWDAY)\n"\
- "-t: Sort by TTY name. In the configuration file, put TTYSORT.\n"\
- "-l<TTY,..>: Search for last logins on the TTYs given in the comma- or\n"\
- " space-separated list. This is another way of specifying which TTYs\n"\
- " to report on; the alternative is to simply give them as separate\n"\
- " arguments on the command line, without an option letter. In the\n"\
- " configuration file, assign a value to TTYS, e.g. TTYS=1a,2a\n"\
- "-L<TTY,..>: Do not report on the named TTYs even if they are enabled.\n"\
- " In the configuration file, assign a value to IGNORETTYS, e.g.\n"\
- " IGNORETTYS=tty1f,tty1g\n"\
- "-i<login,...>: When searching for the last login on a TTY, ignore the\n"\
- " login names given in the comma-separate list. Variable: IGNORENAMES.\n"\
- "-o: Do not print header. In the configuration file, put NOHEADER.\n"\
- "-g<max-time-gap>: Do rudimentary verification of wtmp records by skipping\n"\
- " records that have timestamps more than <max-time-gap> days different\n"\
- " than the last (non-skipped) record processed from the same file. \n"\
- " (MAXTIMEGAP)\n"\
- "-x: Print debugging info.\n",
- Name,rcFile,rcFile,rcFile,Name,reportInterval
- exit 0
- }
- Year = strftime("%Y")
- MkMonth2Num()
- Running = "r" in Options
- Unsorted = "n" in Options || Running
- Sorted = !Unsorted || "s" in Options
- ttySort = "t" in Options
- Debug = "x" in Options
- ShowDay = "d" in Options
- doHeader = !("o" in Options)
- if ("g" in Options)
- maxTimeGap = Options["g"] * 86400
- if ("e" in Options) {
- NumGettys = FindMGettys(GettyLines)
- qsortByArbIndex(GettyLines,k)
- for (i = 1; i <= NumGettys; i++)
- print k[i]
- exit 0
- }
- if ("&" in Options)
- NumLines = " -n " Options["&"]
- CurTime = systime()
- if (Debug)
- printf "Current time: %d\n",CurTime > "/dev/stderr"
- if ("i" in Options)
- MakeSet(IgnoreLogins,Options["i"],"[, ]+")
- if (ARGC > 1) {
- for (i = 1; i < ARGC; i++)
- if (!(ARGV[i] in GettyLines)) {
- GettyLines[ARGV[i]]
- NumGettys++
- }
- makeTTYmap(GettyLines,ttyMap)
- }
- else if ("l" in Options) {
- NumGettys = MakeSet(GettyLines,Options["l"],"[, ]+")
- makeTTYmap(GettyLines,ttyMap)
- }
- else {
- NumGettys = FindMGettys(GettyLines)
- if ("L" in Options) {
- MakeSet(NonGettyLines,Options["L"],"[, ]+")
- for (tty in NonGettyLines)
- if (tty in GettyLines) {
- delete GettyLines[tty]
- NumGettys--
- }
- }
- for (tty in GettyLines)
- ttyMap[tty] = tty
- }
- if ("T" in Options) {
- NumGettys = qsortByArbIndex(GettyLines,k)
- for (i = 1; i <= NumGettys; i++)
- print k[i]
- exit 0
- }
- if (Debug) {
- printf "Searching for:" > "/dev/stderr"
- for (Line in GettyLines)
- printf " %s",Line > "/dev/stderr"
- print "" > "/dev/stderr"
- }
- Format = "%-9s %-8s %16s %-21s %11s %9s"
- if (doHeader) {
- Header = sprintf(Format,"User","TTY","Login date","Dur","Age","Old")
- # If sorting, hold off on printing header so it doesn't come before
- # debugging and such that we might be printing
- if (Unsorted)
- print Header
- }
- split("/usr/bin/last -w /etc/utmp:/usr/bin/last" NumLines,Cmds,":")
- for (i = 1; i in Cmds; i++)
- if (!(NumGettys = \
- ProcLast(Cmds[i],GettyLines,NumGettys,Last,Ages,Format,IgnoreLogins,
- ShowDay,(i > 1) ? maxTimeGap : 0)))
- break
- if (Sorted) {
- if (ttySort) {
- if (Debug) {
- printf "Sorting tty names:" > "/dev/stderr"
- for (i in Ages)
- printf " %s",i > "/dev/stderr"
- print "" > "/dev/stderr"
- }
- qsortByArbIndex(Ages,k)
- }
- else {
- if (Debug) {
- printf "Sorting ages:" > "/dev/stderr"
- for (i in Ages)
- printf " %s",Ages[i] > "/dev/stderr"
- print "" > "/dev/stderr"
- }
- qsortArbIndByValue(Ages,k)
- }
- if (Debug)
- print "Done sorting." > "/dev/stderr"
- print Header
- for (i = 1; i in k; i++)
- print Last[k[i]]
- }
- }
-
- function makeTTYmap(GettyLines,ttyMap, names) {
- for (tty in GettyLines) {
- ttyMap[tty] = tty
- bothTTYnames(tty,names)
- ttyMap[names["upper"]] = tty
- ttyMap[names["lower"]] = tty
- }
- }
-
- # Last produces output like this:
- #User Line Device PID Login time Elapsed Time Comments
- #rstevew 3C tty3C 26585 Sun Mar 14 04:05 00:21 logged in
- # 1 2 3 4 5 6 7 8 9 10 ...
- # Globals: Count, LastDay, PrintedDay
-
- function ProcLast(Cmd,GettyLines,NumGettys,Last,Ages,Format,IgnoreLogins,
- ShowDay,maxTimeGap,
- Device,Month,DayOfMonth,TimeElem,Fields,Line,Age,LoginTime,Old,User,
- TimeSinceLogin,Day,lastRec) {
- # Exit 0 for gawk
- # Timezone is wiped out so last will print in GMT, to avoid having to
- # figure daylight savings when comparing last time to current time.
- Cmd = "TZ= " Cmd "; exit 0"
- if (Debug)
- print "Command is: " Cmd > "/dev/stderr"
- while ((Cmd | getline) == 1) {
- if (Running && ++reportCount == reportInterval)
- lineReport(NumGettys,GettyLines)
- if (Debug && ++Count == 100) {
- Total += Count
- Count = 0
- if (PrintedDay) {
- PrintedDay = 0
- print "" > "/dev/stderr"
- }
- printf "%d records read (now at %s %s %s %s).\n",
- Total,$5,$6,$7,$8 > "/dev/stderr"
- }
- if ($1 == "User")
- continue
- if (ShowDay) {
- Day = $6 "-" $7
- if (Day != LastDay) {
- if (!PrintedDay) {
- printf "Now at" > "/dev/stderr"
- PrintedDay = 1
- }
- printf " %s",Day > "/dev/stderr"
- LastDay = Day
- }
- }
- User = $1
- Device = $3
- if (!(Device in ttyMap) || User in IgnoreLogins) {
- if (maxTimeGap)
- lastRec = $0
- continue
- }
-
- Month = $6
- DayOfMonth = $7
- Ages[Device] = LoginTime = lastTime2unixtime(Year,Month,DayOfMonth,$8)
-
- if (maxTimeGap) {
- if (lastRec != "" && !checkGap(maxTimeGap,lastRec,LoginTime,Year)) {
- lastRec = $0
- continue
- }
- lastRec = $0
- }
-
- TimeSinceLogin = CurTime - LoginTime
-
- # Split login duration into hours & minutes
- split($9,TimeElem,":")
- # Calculate time since end of last login
- # Due to the way last calculates login duration, old may end up a
- # minute longer than it actually is, so subtract 60 seconds.
- Old = TimeSinceLogin - (TimeElem[1]*3600 + TimeElem[2]*60) - 60
-
- # Get Comments field by discarding User, Line, Device, PID, and date
- match($0,"^[^ ]+ +[^ ]+ +[^ ]+ +[^ ]+ +[^ ]+ +[^ ]+ +[^ ]+ +[^ ]+ +")
- Fields = substr($0,RLENGTH + 1)
-
- Age = sec2dhm(TimeSinceLogin)
- if (Old+0 > 60)
- Old = sec2dhm(Old)
- else
- Old = ""
- # Because last login time is given for GMT, must recreate it
- # with timezone taken into consideration
- # user tty login date
- Line = sprintf(Format,User,Device,strftime("%a %b %d %H:%M",LoginTime),
- Fields,Age,Old)
- if (Debug) {
- if (PrintedDay) {
- PrintedDay = 0
- print "" > "/dev/stderr"
- }
- printf "Found record for %s in output of \"%s\":\n%s\n",
- Device,Cmd,$0 > "/dev/stderr"
- printf "Date: %d (%s), age: %d (%s)\n",LoginTime,
- strftime("%c",LoginTime),TimeSinceLogin,Age > "/dev/stderr"
- }
-
- if (Unsorted) {
- if (PrintedDay) {
- PrintedDay = 0
- print "" > "/dev/stderr"
- }
- print Line
- }
- Last[Device] = Line
- delete GettyLines[ttyMap[Device]]
- delete ttyMap[Device]
- reportCount = 0
- if (!--NumGettys)
- break
- if (Debug)
- lineReport(NumGettys,GettyLines)
- }
- if (PrintedDay) {
- PrintedDay = 0
- print "" > "/dev/stderr"
- }
- close(Cmd)
- return NumGettys
- }
-
- function checkGap(maxTimeGap,lastRec,LoginTime,Year, Elem,lastTime) {
- split(lastRec,Elem," +")
- lastTime = lastTime2unixtime(Year,Elem[6],Elem[7],Elem[8])
- # print abs(LoginTime-lastTime)
- if ((abs(LoginTime - lastTime) > maxTimeGap))
- {
- if (PrintedDay) {
- PrintedDay = 0
- print "" > "/dev/stderr"
- }
- printf "Skipping record for %s - time gap too large (%d days)\n",
- strftime("%B %d %Y",LoginTime),abs(LoginTime - lastTime)/86400 \
- > "/dev/stderr"
- return 0
- }
- return 1
- }
-
- function lastTime2unixtime(Year,Month,Day,Time, TimeElem) {
- split(Time,TimeElem,":")
- return unixtime(Year,Month2Num[Month],Day,TimeElem[1],TimeElem[2],0)
- }
-
- function lineReport(NumGettys,GettyLines, Device) {
- if (PrintedDay) {
- PrintedDay = 0
- print "" > "/dev/stderr"
- }
- printf "Still searching for %d line(s):",NumGettys > "/dev/stderr"
- for (Device in GettyLines)
- printf " %s",Device > "/dev/stderr"
- print "" > "/dev/stderr"
- }
-
- # Getty lines:
- #01:2345:respawn:/etc/getty tty01 sc_m
- #3A:23:respawn:/usr/lib/uucp/uugetty -t60 tty3A 3
-
- function FindGettys(GettyLines, Line,F,Elem,NumGettys,Cmd,File) {
- File = "/etc/inittab"
- while ((getline Line < File) == 1) {
- if (Line ~ "^#")
- continue
- split(Line,F,":")
- if (F[3] == "respawn" && F[4] ~ "^[^ \t]*getty ") {
- split(F[4],Cmd,"[ \t]+")
- for (Elem = 2; Elem in Cmd; Elem++)
- if (Cmd[Elem] ~ "(^|/)tty") {
- GettyLines[Cmd[Elem]]
- NumGettys++
- break
- }
- }
- }
- close(File)
- return NumGettys
- }
-
- function FindMGettys(GettyLines, Elem,NumGettys) {
- NumGettys = FindGettys(GettyLines)
- for (Elem in GettyLines)
- if (Elem !~ "[A-Z]") {
- delete GettyLines[Elem]
- NumGettys--
- }
- return NumGettys
- }
-
- # MakeSet: make a set from a list.
- # An index with the name of each element of the list
- # is created in the given array.
- # Input variables:
- # Elements is a string containing the list of elements.
- # Sep is the character that separates the elements of the list.
- # Output variables:
- # Set is the array.
- # Return value: the number of elements added to the set.
- function MakeSet(Set,Elements,Sep, i,Num,Names) {
- Num = split(Elements,Names,Sep)
- for (i = 1; i <= Num; i++)
- Set[Names[i]]
- return Num
- }
-
- ### Begin qsort routines
-
- # Arr[] is an array of values with arbitrary indices.
- # k[] is returned with numeric indices 1..n.
- # The values in k[] are the indices of Arr[],
- # ordered so that if Arr[] is stepped through
- # in the order Arr[k[1]] .. Arr[k[n]], it will be stepped
- # through in order of the values of its elements.
- # The return value is the number of elements in the arrays (n).
- function qsortArbIndByValue(Arr,k, ArrInd,ElNum) {
- ElNum = 0
- for (ArrInd in Arr)
- k[++ElNum] = ArrInd
- qsortSegment(Arr,k,1,ElNum)
- return ElNum
- }
-
- # Sort a segment of an array.
- # Arr[] contains data with arbitrary indices.
- # k[] has indices 1..nelem, with the indices of arr[] as values.
- # This function sorts the elements of arr that are pointed to by
- # k[start..end], swapping the values of elements of k[] so that
- # when this function returns arr[k[start..end]] will be in order.
- function qsortSegment(Arr,k,start,end, left,right,sepval,tmp,tmpe,tmps) {
- # handle two-element case explicitly for a tiny speedup
- if ((end - start) == 1) {
- if (Arr[tmps = k[start]] > Arr[tmpe = k[end]]) {
- k[start] = tmpe
- k[end] = tmps
- }
- return
- }
- # Make sure comparisons act on these as numbers
- left = start+0
- right = end+0
- sepval = Arr[k[int((left + right) / 2)]]
- # Make every element <= sepval be to the left of every element > sepval
- while (left < right) {
- while (Arr[k[left]] < sepval)
- left++
- while (Arr[k[right]] > sepval)
- right--
- if (left < right) {
- tmp = k[left]
- k[left++] = k[right]
- k[right--] = tmp
- }
- }
- if (left == right)
- if (Arr[k[left]] < sepval)
- left++
- else
- right--
- if (start < right)
- qsortSegment(Arr,k,start,right)
- if (left < end)
- qsortSegment(Arr,k,left,end)
- }
-
- # Arr[] is an array of values with arbitrary indices.
- # k[] is returned with numeric indices 1..n.
- # The values in k are the indices of Arr[],
- # ordered so that if Arr[] is stepped through
- # in the order Arr[k[1]] .. Arr[k[n]], it will be stepped
- # through in order of the values of its indices.
- # The return value is the number of elements in the arrays (n).
- # If the indexes are numeric, Numeric should be true, so that they can be
- # compared as such rather than as strings. Numeric indexes do not have to be
- # contiguous.
- function qsortByArbIndex(Arr,k,Numeric, ArrInd,ElNum) {
- ElNum = 0
- if (Numeric)
- # Indexes do not preserve numeric type, so must be forced
- for (ArrInd in Arr)
- k[++ElNum] = ArrInd+0
- else
- for (ArrInd in Arr)
- k[++ElNum] = ArrInd
- qsortNumIndByValue(k,1,ElNum)
- return ElNum
- }
-
- # Arr is an array of elements with contiguous numeric indexes to be sorted
- # by value.
- # start and end are the starting and ending indexes of the range to be sorted.
- function qsortNumIndByValue(Arr,start,end, left,right,sepval,tmp,tmpe,tmps) {
- # handle two-element case explicitly for a tiny speedup
- if ((start - end) == 1) {
- if ((tmps = Arr[start]) > (tmpe = Arr[end])) {
- Arr[start] = tmpe
- Arr[end] = tmps
- }
- return
- }
- left = start+0
- right = end+0
- sepval = Arr[int((left + right) / 2)]
- while (left < right) {
- while (Arr[left] < sepval)
- left++
- while (Arr[right] > sepval)
- right--
- if (left <= right) {
- tmp = Arr[left]
- Arr[left++] = Arr[right]
- Arr[right--] = tmp
- }
- }
- if (start < right)
- qsortNumIndByValue(Arr,start,right)
- if (left < end)
- qsortNumIndByValue(Arr,left,end)
- }
-
- ### End qsort routines
-
- ### Start of ProcArgs library
- # @(#) ProcArgs 1.11 96/12/08
- # 92/02/29 john h. dubois iii (john@armory.com)
- # 93/07/18 Added "#" arg type
- # 93/09/26 Do not count -h against MinArgs
- # 94/01/01 Stop scanning at first non-option arg. Added ">" option type.
- # Removed meaning of "+" or "-" by itself.
- # 94/03/08 Added & option and *()< option types.
- # 94/04/02 Added NoRCopt to Opts()
- # 94/06/11 Mark numeric variables as such.
- # 94/07/08 Opts(): Do not require any args if h option is given.
- # 95/01/22 Record options given more than once. Record option num in argv.
- # 95/06/08 Added ExclusiveOptions().
- # 96/01/20 Let rcfiles be a colon-separated list of filenames.
- # Expand $VARNAME at the start of its filenames.
- # Let varname=0 and -option- turn off an option.
- # 96/05/05 Changed meaning of 7th arg to Opts; now can specify exactly how many
- # of the vars should be searched for in the environment.
- # Check for duplicate rcfiles.
- # 96/05/13 Return more specific error values. Note: ProcArgs() and InitOpts()
- # now return various negatives values on error, not just -1, and
- # Opts() may set Err to various positive values, not just 1.
- # Added AllowUnrecOpt.
- # 96/05/23 Check type given for & option
- # 96/06/15 Re-port to awk
- # 96/10/01 Moved file-reading code into ReadConfFile(), so that it can be
- # used by other functions.
- # 96/10/15 Added OptChars
- # 96/11/01 Added exOpts arg to Opts()
- # 96/11/16 Added ; type
- # 96/12/08 Added Opt2Set() & Opt2Sets()
- # 96/12/27 Added CmdLineOpt()
-
- # optlist is a string which contains all of the possible command line options.
- # A character followed by certain characters indicates that the option takes
- # an argument, with type as follows:
- # : String argument
- # ; Non-empty string argument
- # * Floating point argument
- # ( Non-negative floating point argument
- # ) Positive floating point argument
- # # Integer argument
- # < Non-negative integer argument
- # > Positive integer argument
- # The only difference the type of argument makes is in the runtime argument
- # error checking that is done.
-
- # The & option is a special case used to get numeric options without the
- # user having to give an option character. It is shorthand for [-+.0-9].
- # If & is included in optlist and an option string that begins with one of
- # these characters is seen, the value given to "&" will include the first
- # char of the option. & must be followed by a type character other than ":"
- # or ";".
- # Note that if e.g. &> is given, an option of -.5 will produce an error.
-
- # Strings in argv[] which begin with "-" or "+" are taken to be
- # strings of options, except that a string which consists solely of "-"
- # or "+" is taken to be a non-option string; like other non-option strings,
- # it stops the scanning of argv and is left in argv[].
- # An argument of "--" or "++" also stops the scanning of argv[] but is removed.
- # If an option takes an argument, the argument may either immediately
- # follow it or be given separately.
- # "-" and "+" options are treated the same. "+" is allowed because most awks
- # take any -options to be arguments to themselves. gawk 2.15 was enhanced to
- # stop scanning when it encounters an unrecognized option, though until 2.15.5
- # this feature had a flaw that caused problems in some cases. See the OptChars
- # parameter to explicitly set the option-specifier characters.
-
- # If an option that does not take an argument is given,
- # an index with its name is created in Options and its value is set to the
- # number of times it occurs in argv[].
-
- # If an option that does take an argument is given, an index with its name is
- # created in Options and its value is set to the value of the argument given
- # for it, and Options[option-name,"count"] is (initially) set to the 1.
- # If an option that takes an argument is given more than once,
- # Options[option-name,"count"] is incremented, and the value is assigned to
- # the index (option-name,instance) where instance is 2 for the second occurance
- # of the option, etc.
- # In other words, the first time an option with a value is encountered, the
- # value is assigned to an index consisting only of its name; for any further
- # occurances of the option, the value index has an extra (count) dimension.
-
- # The sequence number for each option found in argv[] is stored in
- # Options[option-name,"num",instance], where instance is 1 for the first
- # occurance of the option, etc. The sequence number starts at 1 and is
- # incremented for each option, both those that have a value and those that
- # do not. Options set from a config file have a value of 0 assigned to this.
-
- # Options and their arguments are deleted from argv.
- # Note that this means that there may be gaps left in the indices of argv[].
- # If compress is nonzero, argv[] is packed by moving its elements so that
- # they have contiguous integer indices starting with 0.
- # Option processing will stop with the first unrecognized option, just as
- # though -- was given except that unlike -- the unrecognized option will not be
- # removed from ARGV[]. Normally, an error value is returned in this case.
- # If AllowUnrecOpt is true, it is not an error for an unrecognized option to
- # be found, so the number of remaining arguments is returned instead.
- # If OptChars is not a null string, it is the set of characters that indicate
- # that an argument is an option string if the string begins with one of the
- # characters. A string consisting solely of two of the same option-indicator
- # characters stops the scanning of argv[]. The default is "-+".
- # argv[0] is not examined.
- # The number of arguments left in argc is returned.
- # If an error occurs, the global string OptErr is set to an error message
- # and a negative value is returned.
- # Current error values:
- # -1: option that required an argument did not get it.
- # -2: argument of incorrect type supplied for an option.
- # -3: unrecognized (invalid) option.
- function ProcArgs(argc,argv,OptList,Options,compress,AllowUnrecOpt,OptChars,
- ArgNum,ArgsLeft,Arg,ArgLen,ArgInd,Option,Pos,NumOpt,Value,HadValue,specGiven,
- NeedNextOpt,GotValue,OptionNum,Escape,dest,src,count,c,OptTerm,OptCharSet)
- {
- # ArgNum is the index of the argument being processed.
- # ArgsLeft is the number of arguments left in argv.
- # Arg is the argument being processed.
- # ArgLen is the length of the argument being processed.
- # ArgInd is the position of the character in Arg being processed.
- # Option is the character in Arg being processed.
- # Pos is the position in OptList of the option being processed.
- # NumOpt is true if a numeric option may be given.
- ArgsLeft = argc
- NumOpt = index(OptList,"&")
- OptionNum = 0
- if (OptChars == "")
- OptChars = "-+"
- while (OptChars != "") {
- c = substr(OptChars,1,1)
- OptChars = substr(OptChars,2)
- OptCharSet[c]
- OptTerm[c c]
- }
- for (ArgNum = 1; ArgNum < argc; ArgNum++) {
- Arg = argv[ArgNum]
- if (length(Arg) < 2 || !((specGiven = substr(Arg,1,1)) in OptCharSet))
- break # Not an option; quit
- if (Arg in OptTerm) {
- delete argv[ArgNum]
- ArgsLeft--
- break
- }
- ArgLen = length(Arg)
- for (ArgInd = 2; ArgInd <= ArgLen; ArgInd++) {
- Option = substr(Arg,ArgInd,1)
- if (NumOpt && Option ~ /[-+.0-9]/) {
- # If this option is a numeric option, make its flag be & and
- # its option string flag position be the position of & in
- # the option string.
- Option = "&"
- Pos = NumOpt
- # Prefix Arg with a char so that ArgInd will point to the
- # first char of the numeric option.
- Arg = "&" Arg
- ArgLen++
- }
- # Find position of flag in option string, to get its type (if any).
- # Disallow & as literal flag.
- else if (!(Pos = index(OptList,Option)) || Option == "&") {
- if (AllowUnrecOpt) {
- Escape = 1
- break
- }
- else {
- OptErr = "Invalid option: " specGiven Option
- return -3
- }
- }
-
- # Find what the value of the option will be if it takes one.
- # NeedNextOpt is true if the option specifier is the last char of
- # this arg, which means that if the option requires a value it is
- # the next arg.
- if (NeedNextOpt = (ArgInd >= ArgLen)) { # Value is the next arg
- if (GotValue = ArgNum + 1 < argc)
- Value = argv[ArgNum+1]
- }
- else { # Value is included with option
- Value = substr(Arg,ArgInd + 1)
- GotValue = 1
- }
-
- if (HadValue = AssignVal(Option,Value,Options,
- substr(OptList,Pos + 1,1),GotValue,"",++OptionNum,!NeedNextOpt,
- specGiven)) {
- if (HadValue < 0) # error occured
- return HadValue
- if (HadValue == 2)
- ArgInd++ # Account for the single-char value we used.
- else {
- if (NeedNextOpt) { # option took next arg as value
- delete argv[++ArgNum]
- ArgsLeft--
- }
- break # This option has been used up
- }
- }
- }
- if (Escape)
- break
- # Do not delete arg until after processing of it, so that if it is not
- # recognized it can be left in ARGV[].
- delete argv[ArgNum]
- ArgsLeft--
- }
- if (compress != 0) {
- dest = 1
- src = argc - ArgsLeft + 1
- for (count = ArgsLeft - 1; count; count--) {
- ARGV[dest] = ARGV[src]
- dest++
- src++
- }
- }
- return ArgsLeft
- }
-
- # Assignment to values in Options[] occurs only in this function.
- # Option: Option specifier character.
- # Value: Value to be assigned to option, if it takes a value.
- # Options[]: Options array to return values in.
- # ArgType: Argument type specifier character.
- # GotValue: Whether any value is available to be assigned to this option.
- # Name: Name of option being processed.
- # OptionNum: Number of this option (starting with 1) if set in argv[],
- # or 0 if it was given in a config file or in the environment.
- # SingleOpt: true if the value (if any) that is available for this option was
- # given as part of the same command line arg as the option. Used only for
- # options from the command line.
- # specGiven is the option specifier character use, if any (e.g. - or +),
- # for use in error messages.
- # Global variables: OptErr
- # Return value: negative value on error, 0 if option did not require an
- # argument, 1 if it did & used the whole arg, 2 if it required just one char of
- # the arg.
- # Current error values:
- # -1: Option that required an argument did not get it.
- # -2: Value of incorrect type supplied for option.
- # -3: Bad type given for option &
- function AssignVal(Option,Value,Options,ArgType,GotValue,Name,OptionNum,
- SingleOpt,specGiven, UsedValue,Err,NumTypes) {
- # If option takes a value... [
- NumTypes = "*()#<>]"
- if (Option == "&" && ArgType !~ "[" NumTypes) { # ]
- OptErr = "Bad type given for & option"
- return -3
- }
-
- if (UsedValue = (ArgType ~ "[:;" NumTypes)) { # ]
- if (!GotValue) {
- if (Name != "")
- OptErr = "Variable requires a value -- " Name
- else
- OptErr = "option requires an argument -- " Option
- return -1
- }
- if ((Err = CheckType(ArgType,Value,Option,Name,specGiven)) != "") {
- OptErr = Err
- return -2
- }
- # Mark this as a numeric variable; will be propogated to Options[] val.
- if (ArgType != ":" && ArgType != ";")
- Value += 0
- if ((Instance = ++Options[Option,"count"]) > 1)
- Options[Option,Instance] = Value
- else
- Options[Option] = Value
- }
- # If this is an environ or rcfile assignment & it was given a value...
- else if (!OptionNum && Value != "") {
- UsedValue = 1
- # If the value is "0" or "-" and this is the first instance of it,
- # do not set Options[Option]; this allows an assignment in an rcfile to
- # turn off an option (for the simple "Option in Options" test) in such
- # a way that it cannot be turned on in a later file.
- if (!(Option in Options) && (Value == "0" || Value == "-"))
- Instance = 1
- else
- Instance = ++Options[Option]
- # Save the value even though this is a flag
- Options[Option,Instance] = Value
- }
- # If this is a command line flag and has a - following it in the same arg,
- # it is being turned off.
- else if (OptionNum && SingleOpt && substr(Value,1,1) == "-") {
- UsedValue = 2
- if (Option in Options)
- Instance = ++Options[Option]
- else
- Instance = 1
- Options[Option,Instance]
- }
- # If this is a flag assignment without a value, increment the count for the
- # flag unless it was turned off. The indicator for a flag being turned off
- # is that the flag index has not been set in Options[] but it has an
- # instance count.
- else if (Option in Options || !((Option,1) in Options))
- # Increment number of times this flag seen; will inc null value to 1
- Instance = ++Options[Option]
- Options[Option,"num",Instance] = OptionNum
- return UsedValue
- }
-
- # Option is the option letter
- # Value is the value being assigned
- # Name is the var name of the option, if any
- # ArgType is one of:
- # : String argument
- # ; Non-null string argument
- # * Floating point argument
- # ( Non-negative floating point argument
- # ) Positive floating point argument
- # # Integer argument
- # < Non-negative integer argument
- # > Positive integer argument
- # specGiven is the option specifier character use, if any (e.g. - or +),
- # for use in error messages.
- # Returns null on success, err string on error
- function CheckType(ArgType,Value,Option,Name,specGiven, Err,ErrStr) {
- if (ArgType == ":")
- return ""
- if (ArgType == ";") {
- if (Value == "")
- Err = "must be a non-empty string"
- }
- # A number begins with optional + or -, and is followed by a string of
- # digits or a decimal with digits before it, after it, or both
- else if (Value !~ /^[-+]?([0-9]+|[0-9]*\.[0-9]+|[0-9]+\.)$/)
- Err = "must be a number"
- else if (ArgType ~ "[#<>]" && Value ~ /\./)
- Err = "may not include a fraction"
- else if (ArgType ~ "[()<>]" && Value < 0)
- Err = "may not be negative"
- # (
- else if (ArgType ~ "[)>]" && Value == 0)
- Err = "must be a positive number"
- if (Err != "") {
- ErrStr = "Bad value \"" Value "\". Value assigned to "
- if (Name != "")
- return ErrStr "variable " substr(Name,1,1) " " Err
- else {
- if (Option == "&")
- Option = Value
- return ErrStr "option " specGiven substr(Option,1,1) " " Err
- }
- }
- else
- return ""
- }
-
- # Note: only the above functions are needed by ProcArgs.
- # The rest of these functions call ProcArgs() and also do other
- # option-processing stuff.
-
- # Opts: Process command line arguments.
- # Opts processes command line arguments using ProcArgs()
- # and checks for errors. If an error occurs, a message is printed
- # and the program is exited.
- #
- # Input variables:
- # Name is the name of the program, for error messages.
- # Usage is a usage message, for error messages.
- # OptList the option description string, as used by ProcArgs().
- # MinArgs is the minimum number of non-option arguments that this
- # program should have, non including ARGV[0] and +h.
- # If the program does not require any non-option arguments,
- # MinArgs should be omitted or given as 0.
- # rcFiles, if given, is a colon-seprated list of filenames to read for
- # variable initialization. If a filename begins with ~/, the ~ is replaced
- # by the value of the environment variable HOME. If a filename begins with
- # $, the part from the character after the $ up until (but not including)
- # the first character not in [a-zA-Z0-9_] will be searched for in the
- # environment; if found its value will be substituted, if not the filename will
- # be discarded.
- # rcfiles are read in the order given.
- # Values given in them will not override values given on the command line,
- # and values given in later files will not override those set in earlier
- # files, because AssignVal() will store each with a different instance index.
- # The first instance of each variable, either on the command line or in an
- # rcfile, will be stored with no instance index, and this is the value
- # normally used by programs that call this function.
- # VarNames is a comma-separated list of variable names to map to options,
- # in the same order as the options are given in OptList.
- # If EnvSearch is given and nonzero, the first EnvSearch variables will also be
- # searched for in the environment. If set to -1, all values will be searched
- # for in the environment. Values given in the environment will override
- # those given in the rcfiles but not those given on the command line.
- # NoRCopt, if given, is an additional letter option that if given on the
- # command line prevents the rcfiles from being read.
- # See ProcArgs() for a description of AllowUnRecOpt and optChars, and
- # ExclusiveOptions() for a description of exOpts.
- # Special options:
- # If x is made an option and is given, some debugging info is output.
- # h is assumed to be the help option.
-
- # Global variables:
- # The command line arguments are taken from ARGV[].
- # The arguments that are option specifiers and values are removed from
- # ARGV[], leaving only ARGV[0] and the non-option arguments.
- # The number of elements in ARGV[] should be in ARGC.
- # After processing, ARGC is set to the number of elements left in ARGV[].
- # The option values are put in Options[].
- # On error, Err is set to a positive integer value so it can be checked for in
- # an END block.
- # Return value: The number of elements left in ARGV is returned.
- # Must keep OptErr global since it may be set by InitOpts().
- function Opts(Name,Usage,OptList,MinArgs,rcFiles,VarNames,EnvSearch,NoRCopt,
- AllowUnrecOpt,optChars,exOpts, ArgsLeft,e) {
- if (MinArgs == "")
- MinArgs = 0
- ArgsLeft = ProcArgs(ARGC,ARGV,OptList NoRCopt,Options,1,AllowUnrecOpt,
- optChars)
- if (ArgsLeft < (MinArgs+1) && !("h" in Options)) {
- if (ArgsLeft >= 0) {
- OptErr = "Not enough arguments"
- Err = 4
- }
- else
- Err = -ArgsLeft
- printf "%s: %s.\nUse -h for help.\n%s\n",
- Name,OptErr,Usage > "/dev/stderr"
- exit 1
- }
- if (rcFiles != "" && (NoRCopt == "" || !(NoRCopt in Options)) &&
- (e = InitOpts(rcFiles,Options,OptList,VarNames,EnvSearch)) < 0)
- {
- print Name ": " OptErr ".\nUse -h for help." > "/dev/stderr"
- Err = -e
- exit 1
- }
- if ((exOpts != "") && ((OptErr = ExclusiveOptions(exOpts,Options)) != ""))
- {
- printf "%s: Error: %s\n",Name,OptErr > "/dev/stderr"
- Err = 1
- exit 1
- }
- return ArgsLeft
- }
-
- # ReadConfFile(): Read a file containing var/value assignments, in the form
- # <variable-name><assignment-char><value>.
- # Whitespace (spaces and tabs) around a variable (leading whitespace on the
- # line and whitespace between the variable name and the assignment character)
- # is stripped. Lines that do not contain an assignment operator or which
- # contain a null variable name are ignored, other than possibly being noted in
- # the return value. If more than one assignment is made to a variable, the
- # first assignment is used.
- # Input variables:
- # File is the file to read.
- # Comment is the line-comment character. If it is found as the first non-
- # whitespace character on a line, the line is ignored.
- # Assign is the assignment string. The first instance of Assign on a line
- # separates the variable name from its value.
- # If StripWhite is true, whitespace around the value (whitespace between the
- # assignment char and trailing whitespace on the line) is stripped.
- # VarPat is a pattern that variable names must match.
- # Example: "^[a-zA-Z][a-zA-Z0-9]+$"
- # If FlagsOK is true, variables are allowed to be "set" by being put alone on
- # a line; no assignment operator is needed. These variables are set in
- # the output array with a null value. Lines containing nothing but
- # whitespace are still ignored.
- # Output variables:
- # Values[] contains the assignments, with the indexes being the variable names
- # and the values being the assigned values.
- # Lines[] contains the line number that each variable occured on. A flag set
- # is record by giving it an index in Lines[] but not in Values[].
- # Return value:
- # If any errors occur, a string consisting of descriptions of the errors
- # separated by newlines is returned. In no case will the string start with a
- # numeric value. If no errors occur, the number of lines read is returned.
- function ReadConfigFile(Values,Lines,File,Comment,Assign,StripWhite,VarPat,
- FlagsOK,
- Line,Status,Errs,AssignLen,LineNum,Var,Val) {
- if (Comment != "")
- Comment = "^" Comment
- AssignLen = length(Assign)
- if (VarPat == "")
- VarPat = "." # null varname not allowed
- while ((Status = (getline Line < File)) == 1) {
- LineNum++
- sub("^[ \t]+","",Line)
- if (Line == "") # blank line
- continue
- if (Comment != "" && Line ~ Comment)
- continue
- if (Pos = index(Line,Assign)) {
- Var = substr(Line,1,Pos-1)
- Val = substr(Line,Pos+AssignLen)
- if (StripWhite) {
- sub("^[ \t]+","",Val)
- sub("[ \t]+$","",Val)
- }
- }
- else {
- Var = Line # If no value, var is entire line
- Val = ""
- }
- if (!FlagsOK && Val == "") {
- Errs = Errs \
- sprintf("\nBad assignment on line %d of file %s: %s",
- LineNum,File,Line)
- continue
- }
- sub("[ \t]+$","",Var)
- if (Var !~ VarPat) {
- Errs = Errs sprintf("\nBad variable name on line %d of file %s: %s",
- LineNum,File,Var)
- continue
- }
- if (!(Var in Lines)) {
- Lines[Var] = LineNum
- if (Pos)
- Values[Var] = Val
- }
- }
- if (Status)
- Errs = Errs "\nCould not read file " File
- close(File)
- return Errs == "" ? LineNum : substr(Errs,2) # Skip first newline
- }
-
- # Variables:
- # Data is stored in Options[].
- # rcFiles, OptList, VarNames, and EnvSearch are as as described for Opts().
- # Global vars:
- # Sets OptErr. Uses ENVIRON[].
- # If anything is read from any of the rcfiles, sets READ_RCFILE to 1.
- function InitOpts(rcFiles,Options,OptList,VarNames,EnvSearch,
- Line,Var,Pos,Vars,Map,CharOpt,NumVars,TypesInd,Types,Type,Ret,i,rcFile,
- fNames,numrcFiles,filesRead,Err,Values,retStr) {
- split("",filesRead,"") # make awk know this is an array
- NumVars = split(VarNames,Vars,",")
- TypesInd = Ret = 0
- if (EnvSearch == -1)
- EnvSearch = NumVars
- for (i = 1; i <= NumVars; i++) {
- Var = Vars[i]
- CharOpt = substr(OptList,++TypesInd,1)
- if (CharOpt ~ "^[:;*()#<>&]$")
- CharOpt = substr(OptList,++TypesInd,1)
- Map[Var] = CharOpt
- Types[Var] = Type = substr(OptList,TypesInd+1,1)
- # Do not overwrite entries from environment
- if (i <= EnvSearch && Var in ENVIRON &&
- (Err = AssignVal(CharOpt,ENVIRON[Var],Options,Type,1,Var,0)) < 0)
- return Err
- }
-
- numrcFiles = split(rcFiles,fNames,":")
- for (i = 1; i <= numrcFiles; i++) {
- rcFile = fNames[i]
- if (rcFile ~ "^~/")
- rcFile = ENVIRON["HOME"] substr(rcFile,2)
- else if (rcFile ~ /^\$/) {
- rcFile = substr(rcFile,2)
- match(rcFile,"^[a-zA-Z0-9_]*")
- envvar = substr(rcFile,1,RLENGTH)
- if (envvar in ENVIRON)
- rcFile = ENVIRON[envvar] substr(rcFile,RLENGTH+1)
- else
- continue
- }
- if (rcFile in filesRead)
- continue
- # rcfiles are liable to be given more than once, e.g. UHOME and HOME
- # may be the same
- filesRead[rcFile]
- if ("x" in Options)
- printf "Reading configuration file %s\n",rcFile > "/dev/stderr"
- retStr = ReadConfigFile(Values,Lines,rcFile,"#","=",0,"",1)
- if (retStr > 0)
- READ_RCFILE = 1
- else if (ret != "") {
- OptErr = retStr
- Ret = -1
- }
- for (Var in Lines)
- if (Var in Map) {
- if ((Err = AssignVal(Map[Var],
- Var in Values ? Values[Var] : "",Options,Types[Var],
- Var in Values,Var,0)) < 0)
- return Err
- }
- else {
- OptErr = sprintf(\
- "Unknown var \"%s\" assigned to on line %d\nof file %s",Var,
- Lines[Var],rcFile)
- Ret = -1
- }
- }
-
- if ("x" in Options)
- for (Var in Map)
- if (Map[Var] in Options)
- printf "(%s) %s=%s\n",Map[Var],Var,Options[Map[Var]] > \
- "/dev/stderr"
- else
- printf "(%s) %s not set\n",Map[Var],Var > "/dev/stderr"
- return Ret
- }
-
- # OptSets is a semicolon-separated list of sets of option sets.
- # Within a list of option sets, the option sets are separated by commas. For
- # each set of sets, if any option in one of the sets is in Options[] AND any
- # option in one of the other sets is in Options[], an error string is returned.
- # If no conflicts are found, nothing is returned.
- # Example: if OptSets = "ab,def,g;i,j", an error will be returned due to
- # the exclusions presented by the first set of sets (ab,def,g) if:
- # (a or b is in Options[]) AND (d, e, or f is in Options[]) OR
- # (a or b is in Options[]) AND (g is in Options) OR
- # (d, e, or f is in Options[]) AND (g is in Options)
- # An error will be returned due to the exclusions presented by the second set
- # of sets (i,j) if: (i is in Options[]) AND (j is in Options[]).
- # todo: make options given on command line unset options given in config file
- # todo: that they conflict with.
- function ExclusiveOptions(OptSets,Options,
- Sets,SetSet,NumSets,Pos1,Pos2,Len,s1,s2,c1,c2,ErrStr,L1,L2,SetSets,NumSetSets,
- SetNum,OSetNum) {
- NumSetSets = split(OptSets,SetSets,";")
- # For each set of sets...
- for (SetSet = 1; SetSet <= NumSetSets; SetSet++) {
- # NumSets is the number of sets in this set of sets.
- NumSets = split(SetSets[SetSet],Sets,",")
- # For each set in a set of sets except the last...
- for (SetNum = 1; SetNum < NumSets; SetNum++) {
- s1 = Sets[SetNum]
- L1 = length(s1)
- for (Pos1 = 1; Pos1 <= L1; Pos1++)
- # If any of the options in this set was given, check whether
- # any of the options in the other sets was given. Only check
- # later sets since earlier sets will have already been checked
- # against this set.
- if ((c1 = substr(s1,Pos1,1)) in Options)
- for (OSetNum = SetNum+1; OSetNum <= NumSets; OSetNum++) {
- s2 = Sets[OSetNum]
- L2 = length(s2)
- for (Pos2 = 1; Pos2 <= L2; Pos2++)
- if ((c2 = substr(s2,Pos2,1)) in Options)
- ErrStr = ErrStr "\n"\
- sprintf("Cannot give both %s and %s options.",
- c1,c2)
- }
- }
- }
- if (ErrStr != "")
- return substr(ErrStr,2)
- return ""
- }
-
- # The value of each instance of option Opt that occurs in Options[] is made an
- # index of Set[].
- # The return value is the number of instances of Opt in Options.
- function Opt2Set(Options,Opt,Set, count) {
- if (!(Opt in Options))
- return 0
- Set[Options[Opt]]
- count = Options[Opt,"count"]
- for (; count > 1; count--)
- Set[Options[Opt,count]]
- return count
- }
-
- # The value of each instance of option Opt that occurs in Options[] that
- # begins with "!" is made an index of nSet[] (with the ! stripped from it).
- # Other values are made indexes of Set[].
- # The return value is the number of instances of Opt in Options.
- function Opt2Sets(Options,Opt,Set,nSet, count,aSet,ret) {
- ret = Opt2Set(Options,Opt,aSet)
- for (value in aSet)
- if (substr(value,1,1) == "!")
- nSet[substr(value,2)]
- else
- Set[value]
- return ret
- }
-
- # Returns true if option Opt was given on the command line.
- function CmdLineOpt(Options,Opt, i) {
- for (i = 1; (Opt,"num",i) in Options; i++)
- if (Options[Opt,"num",i] != 0)
- return 1
- return 0
- }
- ### End of ProcArgs library
- ### Begin timedate routines.
- # These functions operate on absolute dates & times.
-
- # convert month/day or year/month/day date to yymmdd date
- # uses global "year" var if year not given
- function makedate(InDate,Elements,d,date) {
- Elements = split(InDate,d,"/")
- date = d[1] * 100 + d[2]
- if (Elements == 2)
- date += year
- else if (Elements == 3)
- date = date * 100 + d[3]
- else
- return -1
- return date
- }
-
- # convert yymmdd date to yy/mm/dd date
- function unmakedate(Date) {
- return substr(Date,1,2) "/" substr(Date,3,2) "/" substr(Date,5,2)
- }
-
- function MkMonth2Num( Month) {
- split("Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec",Months,",")
- for (Month in Months)
- Month2Num[Months[Month]] = sprintf("%02d",Month)
- }
-
- # Takes a date and stores its components in the following elements of Date[]:
- # year yy
- # month mm
- # day dd
- # hour hh
- # min mm
- # The following are set in Date[] if given:
- # tz TTT|offset
- # lyear yyyy
- # weekday Www
- # sec ss
-
- # On success, the date in touch/date/etc. format (MMddhhmmyy) is returned.
- # On failure, a negative value is returned.
-
- # InDate form:
- # [Weekday[,] (Month [d]d)|([d]d Month) TZ|time|year TZ|time|year [TZ|time|year]
- # where Www is a weekday name that starts with a recognized 3-char prefix,
- # Month is a month name that starts with a recognized 3-char prefix,
- # [d]d is a day of the month,
- # TZ is a timezone name (three upper case alpha chars) or offset from GMT
- # as [-+]NNNN, time is of the form [h]h:mm[:ss],
- # and year is of the form [cc]nn where cc is >= 19.
- # Common patterns for a particular date:
- # [Tue[,]] Jun 12 11:02:46 [BST|-0800] [19]90
- # [Tue[,]] 12 Jun [19]90 11:02:46 [BST|-0800]
- function ParseDate(InDate,Date, El,MonthName,TimeEl,i,Months,Ind,Num) {
- if (!("Jan" in Month2Num)) {
- MkMonth2Num()
- split("month,day,hour,min,year",TouchParts,",")
- }
- # Clear Date[]
- split("",Date," ")
- Num = split(InDate,El," +")
- if (!(4 <= Num && Num <= 6))
- return -1
- Ind = 1
- if (El[Ind] ~ "^(Mon|Tue|Wed|Thu|Fri|Sat|Sun)[a-z]*,?") {
- Date["weekday"] = substr(El[Ind],1,3)
- Ind++
- }
- if ((El[Ind] + 0) > 0) {
- Date["day"] = sprintf("%02d",El[Ind++])
- MonthName = substr(El[Ind++],1,3)
- }
- else {
- MonthName = substr(El[Ind++],1,3)
- Date["day"] = sprintf("%02d",El[Ind++])
- }
- if ((Date["day"] + 0 > 31) || (Date["day"] + 0 < 1))
- return -5
- if (!(MonthName in Month2Num))
- return -3
- Date["month"] = Month2Num[MonthName]
- for (; Ind <= Num; Ind++) {
- if ((El[Ind] ~ "^[0-2]?[0-9]:[0-5][0-9](:[0-5][0-9])?$") && \
- !("hour" in Date)) {
- split(El[Ind],TimeEl,":")
- Date["hour"] = sprintf("%02d",TimeEl[1])
- Date["min"] = TimeEl[2]
- if (3 in TimeEl)
- Date["sec"] = TimeEl[3]
- }
- else if ((El[Ind] ~ "^[1-9][0-9][0-9][0-9]$") && !("year" in Date)) {
- Date["year"] = substr(El[Ind],3)
- Date["lyear"] = El[Ind]
- }
- else if ((El[Ind] ~ "^[0-9][0-9]$") && !("year" in Date))
- Date["year"] = El[Ind]
- else if ((El[Ind] ~ "^([A-Z][A-Z][A-Z])|([-+][0-2][0-9][0-5][0-9])$") \
- && !("tz" in Date))
- Date["tz"] = El[Ind]
- else
- return -2
- }
- for (i in TouchParts)
- if (!(TouchParts[i] in Date))
- return -i - 5
- touchdate = Date["month"] Date["day"] Date["hour"] Date["min"] Date["year"]
- return touchdate
- }
-
- # Convert a file timestamp as printed by 'l' to an epoch time.
- # noTZ should be 1 if the date output was produced with a 0 TZ; in this case
- # no attempt is made to undo the TZ adjustment.
- function lDate2unixtime(Mon,Day,Year,noTZ, Month) {
- if (!(1 in Month2Num)) {
- MkMonth2Num()
- CurYear = strftime("%y")
- CurMonth = strftime("%m")
- }
- Month = Month2Num[Mon]
- # Deal with varying dates printed by l
- # Use year if given
- # Subtract 1 from year if month given is from last year
- if (Year ~ ":") # If year is actually time...
- Year = (CurYear - (Month > CurMonth)) % 100
- return date2unixtime(Year,Month,Day,noTZ)
- }
-
- # Returns the number of seconds that passed from 1970 Jan 1 00:00:00
- # to the given date.
- # Timezone should be given as a numeric offset from GMT in seconds.
- # Use 0 for Timezone if the date being converted was not generated with a
- # timezone adjustment.
- function unixtime(Year,Month,Day,Hour,Minute,Second,Timezone) {
- return ((YMD2day(Year,Month,Day) * 24 + Hour) * 60 + Minute) * 60 + \
- Second + Timezone
- }
-
- # date2unixtime returns the number of seconds that passed from
- # 1970 Jan 1 00:00:00 GMT to the given date, which is assumed to be in the
- # local timezone. Note that if the given date occured in daylight savings
- # time and the current time (which is used to calculate TZOffset) is not,
- # or vice versa, this will be off by the DST shift.
- # If noTZ is set, the date is taken to be in GMT and TZ modifications are not
- # done.
- # Globals: Sets/uses TZOffset and MDays[].
- function date2unixtime(Year,Month,Day,noTZ, LeapDays) {
- if (!noTZ && TZOffset == "")
- MakeTZOffset()
- if (Year > 100)
- Year -= 1900
- LeapDays = int((Year - 68) / 4)
- if (Month <= 2 && Year % 4 == 0)
- LeapDays -= 1
- if (!MDays[2])
- split("0 31 59 90 120 151 181 212 243 273 304 334 365",MDays," ")
- return ((Year - 70) * 365 + MDays[Month + 0] + Day - 1 + LeapDays) \
- * 24 * 3600 - (noTZ ? 0 : TZOffset)
- }
-
- # Sets global TZOffset to the number of seconds that need to be substracted
- # from the local date (without time of day) to give an epoch time.
- # TZOffset can also be added to systime() before doing %86400 to get the
- # current day number in the local timezone.
- # Note that TZOffset is only correct if the given date is in the same DST
- # phase as the current date.
- # 95/03/26 Calculate TZOffset more accurately.
- function MakeTZOffset( t) {
- t = systime()
- TZOffset = strftime("%H",t)*3600+strftime("%M",t)*60+strftime("%S",t) - \
- t%86400
- if (strftime("%j",0) != "001") # If TZ offset > 0
- TZOffset -= 24*3600
- }
-
- # Convert a numeric timezone to a number of seconds.
- # Example: converts -0830 to -30600
- function TZ2sec(NTimezone) {
- if (NTimezone < 0) {
- NTimezone = substr(NTimezone,2)
- Mult = -1
- }
- else
- Mult = 1
- return (substr(NTimezone,1,2)*3600+substr(NTimezone,3,2)*60)*Mult
- }
-
- # Only works for current time... does *not* take a systime argument!
- function my_strftime(Format, Time) {
- "date \"+" Format "\"" | getline Time
- return Time
- }
-
- ### End timedate routines
- ### Begin epochdays routines.
- # These functions operate on epoch days and epoch months, which have the same 0
- # time as UNIX epoch seconds. These functions are mainly used to avoid having
- # to deal with timezone issues.
- # @(#) epochdays 1.1 95/08/26
-
- # YMD2day(year,month,day-of-month) returns the number of days that passed from
- # 1970 Jan 1 to the given date.
- # All parameters should be given in numeric form.
- # If year < 70, it is assumed to be part of the 2000 century
- # If year in (70..99), it is assumed to be part of the 1900 century.
- # Globals: sets and uses MDays[]
- function YMD2day(Year,Month,Day, LeapDays) {
- Year+=0
- Month+=0
- if (Year < 70)
- Year += 100
- else if (Year >= 100)
- Year -= 1900
- # Year is now the number of years since 1900.
- LeapDays = int((Year - 68) / 4)
- if (Month <= 2 && Year % 4 == 0)
- LeapDays -= 1
- if (!(0 in MDays))
- split("0 31 59 90 120 151 181 212 243 273 304 334 365",MDays," ")
- return (Year - 70) * 365 + MDays[Month] + Day - 1 + LeapDays
- }
-
- # date2day("yy/mm/dd") returns the number of days that passed from
- # 1970 Jan 1 to the given date. -1 is returned on error.
- # The fields are returned in Fields: year in Fields[1], month in Fields[2],
- # and day (if given) in Fields[3].
- function date2day(Date,Fields, Num,Year,Month) {
- Num = split(Date,Fields,"/")
- if (Num != 2 && Num != 3)
- return -1
- if (!(Year = Fields[1] + 0) || !(Month = Fields[2] + 0))
- return -1
- if (Num == 3)
- Day = Fields[3]
- return YMD2day(Year,Month,Day)
- }
-
- # diffdays(year1,month1,day-of-month1,year2,month2,day-of-month2)
- # returns the number of complete days that passed from date 1 to date 2
- function diffdays(year1,month1,day1,year2,month2,day2) {
- return YMD2day(year2,month2,day2) - YMD2day(year1,month1,day1)
- }
-
- # Given an epoch month, return the first day of that month
- function month2day(Month) {
- return YMD2day(int(Month/12) + 1970,Month % 12 + 1,1)
- }
-
- # Given an epoch day, returns epoch month
- function day2month(Day, Date) {
- day2YMD(Day,Date)
- return (Date["y"]-1970)*12 + Date["m"]-1
- }
-
- # Given an epoch month, returns the number of days in that month.
- function monthdays(month, year) {
- if (!(0 in MDur))
- split("31 28 31 30 31 30 31 31 30 31 30 31",MDur)
- year = int(month/12)
- month = month%12+1
- return (!((year+2)%4) && month == 2) ? 29 : MDur[month]
- }
-
- # Given an epoch day (day since 1970 Jan 1; day 0 = 1970 Jan 1, etc.),
- # returns the date elements in Date:
- # Date["y"] = year (4 digits), Date["m"] = month (jan = 1, etc.),
- # Date["d"] = day of month.
- # Globals: Sets/uses MDays[].
- function day2YMD(Day,Date, QYears,Year,NonLeapYears,Month) {
- if (!(0 in LDays)) {
- split("0 31 59 90 120 151 181 212 243 273 304 334 365",MDays," ")
- split("0 31 60 91 121 152 182 213 244 274 305 335 366",LDays," ")
- }
- Day += 365
- # Day is now # of days since Jan 1 1969. 1968 was a leap year.
- QYears = int(Day / (365*4+1))
- Year = 1969 + QYears * 4
- Day -= QYears * (365*4+1)
- # Day now contains no complete leap years.
- Year += NonLeapYears = int(Day/365)
- Leap = !(Year % 4)
- Day -= NonLeapYears * 365
- # Day now contains the day of year.
- # Find the month. Divide day by 32 to get either the correct month or
- # the month prior to it.
- Month = int(Day++ / 32) + 1
- if (Day > (Leap ? LDays[Month+1] : MDays[Month+1]))
- Month++
- Day -= Leap ? LDays[Month] : MDays[Month]
- Date["d"] = Day
- Date["m"] = Month
- Date["y"] = Year
- }
-
- # Given a month number, return a date in the form yy/mm
- function month2date(MonthNum) {
- return sprintf("%02d/%02d",(MonthNum / 12 + 70) % 100, MonthNum % 12 + 1)
- }
-
- # Given a day number, return a date in the form yy/mm/dd or yyyy/mm/dd
- # If century is true, the century is included as part of the year;
- # otherwise it is stripped.
- function day2date(day,century, year) {
- day2YMD(day,Date)
- year = Date["y"]
- if (!century)
- year %= 100
- return sprintf("%02d/%02d/%02d",year,Date["m"],Date["d"])
- }
-
- ### End epochdays routines
- ### Begin timeperiod routines.
- # These functions operate on periods of time.
-
- # Converts Seconds to the form [[[[<days>d]<hours>h]<min>m]<sec>s]
- function sec2dhms(Seconds, Days,Hours,Minutes,Time) {
- Days = int(Seconds / 86400)
- Seconds %= 86400
- Hours = int(Seconds / 3600)
- Seconds %= 3600
- Minutes = int(Seconds / 60)
- Seconds %= 60
- if (Days)
- Time = Days "d"
- if (Time || Hours)
- Time = Time Hours "h"
- if (Time || Minutes)
- Time = Time Minutes "m"
- if (!Time || Seconds)
- Time = Time Seconds "s"
- return Time
- }
-
- # Converts Seconds to the form [[[<days>d]hh:]mm:]ss
- function sec2dhms2(Seconds, Days,Hours,Minutes,Time) {
- Days = int(Seconds / 86400)
- Seconds %= 86400
- Hours = int(Seconds / 3600)
- Seconds %= 3600
- Minutes = int(Seconds / 60)
- Seconds %= 60
- if (Days)
- Time = Days "d "
- if (Time || Hours)
- Time = Time sprintf("%02d",Hours) ":"
- if (Time || Minutes)
- Time = Time sprintf("%02d",Minutes) ":"
- Time = Time sprintf("%02d",Seconds)
- return Time
- }
-
- # Converts Seconds to the form [[<days>d]hh:]mm|m
- function sec2dhm(Seconds, Days,Hours,Minutes,Time) {
- Days = int(Seconds / 86400)
- Seconds %= 86400
- Hours = int(Seconds / 3600)
- Seconds %= 3600
- Minutes = int(Seconds / 60)
- if (Days)
- Time = Days "d "
- if (Time || Hours)
- Time = Time sprintf("%02d",Hours) ":"
- if (Time)
- Time = Time sprintf("%02d",Minutes)
- else
- Time = Minutes
- return Time
- }
-
- # Converts Seconds to the form hours:mm:ss
- function sec2hms(Seconds, Hours,Minutes) {
- Hours = int(Seconds / 3600)
- Seconds %= 3600
- Minutes = int(Seconds / 60)
- Seconds %= 60
- return sprintf("%d:%02d:%02d",Hours,Minutes,Seconds)
- }
-
- ### End timeperiod routines
- ### start canonTTY library
- function nodevTTY(tty) {
- sub("^/dev/","",tty)
- return tty
- }
-
- function canonTTY(tty) {
- if (tty ~ "^/dev/")
- sub("^/dev/","",tty)
- else if (tty !~ /^tty/)
- tty = "tty" tty
- return tty
- }
-
- function shortTTY(tty) {
- # Strip leading "tty" only if name did not begin with /dev
- if (!sub("^/dev/","",tty))
- sub("^tty","",tty)
- return tty
- }
-
- # names["lower"] and names["upper"] are made the canonical non-modem-control
- # and modem-control versions of the TTY name respectively.
- # These are the name as passed but with the first alpha char after "tty"
- # (if any) converted to lowercase and uppercase respectively.
- # If the TTY name is an absolute path and is not of the form /dev/tty*, the
- # case conversion is not done.
- # Any leading /dev/ is stripped. If the name does not contain any directory
- # component and does not begin with "tty", it is prefixed with "tty".
- function bothTTYnames(tty,names, sTTY,letter) {
- sTTY = shortTTY(tty)
- if (tty ~ "^/" && tty !~ "^/dev/tty") {
- names["lower"] = names["upper"] = sTTY
- return 1
- }
- match(sTTY,"[a-zA-Z][^a-zA-Z]*$")
- letter = substr(sTTY,RSTART,1)
- tty = (tty ~ "/") ? "" : "tty"
- names["upper"] = tty PasteStr(sTTY,RSTART,toupper(letter))
- names["lower"] = tty PasteStr(sTTY,RSTART,tolower(letter))
- return 0
- }
- ### end canonTTY library
- ### Begin Strings routines
-
- # Delete the string starting at Start and having length Num from the middle
- # of string S, and return the remaining part.
- function DelStr(S,Start,Num) {
- return substr(S,1,Start - 1) substr(S,Start+Num)
- }
-
- # Insert NewStr into S at position Pos (between the Pos-1'th and the Pos'th
- # characters). S is padded with spaces if neccessary.
- function InsertStr(S,Pos,NewStr, e) {
- e = length(S)+1 # The position after the end of S
- if (e >= Pos)
- return substr(S,1,Pos-1) NewStr substr(S,Pos)
- for (; e < Pos; e++)
- S = S " "
- return S NewStr
- }
-
- # Search for char C in string S starting at position Pos, in the direction
- # specified by Dir (1 = forward, -1 = backward).
- # Return position char found at for success, 0 if not found before start or end
- # of string.
- function FindC(S,Pos,C,Dir, FoundC) {
- while (Pos > 0 && (FoundC = substr(S,Pos,1)) != C && FoundC != "")
- Pos += Dir
- if (FoundC == C)
- return Pos
- else
- return 0
- }
-
- # Split string S into array Arr, one character per index, starting with 1.
- # The number of characters in the string is returned.
- function SplitS(S,Arr, len,i) {
- len = length(S)
- for (i = 1; i <= len; i++)
- Arr[i] = substr(S,i,1)
- return len
- }
-
- # Paste NewStr onto S at position Pos, overwriting what was there
- # S is padded with spaces if neccessary.
- function PasteStr(S,Pos,NewStr, e) {
- e = length(S)+1 # The position after the end of S
- if (e >= Pos)
- return substr(S,1,Pos-1) NewStr substr(S,Pos+length(NewStr))
- for (; e < Pos; e++)
- S = S " "
- return S NewStr
- }
-
- ### End Strings routines
- ### Begin sign routines
-
- function sign(value) {
- if (value > 0)
- return 1
- else if (value < 0)
- return -1
- else
- return 0
- }
-
- function abs(value) {
- if (value >= 0)
- return value
- else
- return -value
- }
-
- ### End sign routines
-