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varmod-localtime.mk revision 1.6 
      1 # $NetBSD: varmod-localtime.mk,v 1.6 2020/12/21 20:47:29 rillig Exp $
      2 #
      3 # Tests for the :localtime variable modifier, which formats a timestamp
      4 # using strftime(3) in local time.
      5 
      6 .if ${TZ} != "Europe/Berlin"	# see unit-tests/Makefile
      7 .  error
      8 .endif
      9 
     10 # Test for the default time format, %c.  Since the time always varies, it's
     11 # only possible to check for the general format here.  The names of the
     12 # month and weekday are always in English, independent from the locale.
     13 # Example: Thu Oct 29 18:56:41 2020
     14 .if ${:U:localtime:tW:M??? ??? ?? ??\:??\:?? ????} == ""
     15 .  error
     16 .endif
     17 
     18 
     19 # modifier name too short, falling back to the SysV modifier.
     20 .if ${%Y:L:localtim=1593536400} != "%Y"
     21 .  error
     22 .endif
     23 
     24 
     25 # 2020-07-01T00:00:00Z
     26 .if ${%Y:L:localtime=1593536400} != "2020"
     27 .  error
     28 .endif
     29 
     30 
     31 # modifier name too long, falling back to the SysV modifier.
     32 .if ${%Y:L:localtimer=1593536400} != "%Y"
     33 .  error
     34 .endif
     35 
     36 
     37 # If the modifier name is not matched exactly, fall back to the
     38 # :from=to modifier.
     39 .if ${gmtime:L:gm%=local%} != "localtime"
     40 .  error
     41 .endif
     42 
     43 
     44 # As of 2020-08-16, it is not possible to pass the seconds via a
     45 # variable expression.  This is because parsing of the :localtime
     46 # modifier stops at the '$' and returns to ApplyModifiers.
     47 #
     48 # There, a colon would be skipped but not a dollar.
     49 # Parsing therefore continues at the '$' of the ${:U159...}, looking
     50 # for an ordinary variable modifier.
     51 #
     52 # At this point, the ${:U} is expanded and interpreted as a variable
     53 # modifier, which results in the error message "Unknown modifier '1'".
     54 #
     55 # If ApplyModifier_Localtime were to pass its argument through
     56 # ParseModifierPart, this would work.
     57 #
     58 # XXX: Where does the empty line 4 in varmod-localtime.exp come from?
     59 # TODO: Remove the \n from "Invalid time value: %s\n" in var.c.
     60 .if ${%Y:L:localtime=${:U1593536400}} != "mtime=11593536400}"
     61 .  error
     62 .endif
     63 
     64 
     65 # Before var.c 1.631 from 2020-10-31 21:40:20, it was possible to pass
     66 # negative time stamps to the :localtime modifier, resulting in dates before
     67 # 1970.  Going back 50 years in the past is not a practical use case for
     68 # make.  Therefore, since var.c 1.631, negative time stamps produce a
     69 # parse error.
     70 .if ${:L:localtime=-1} != ""
     71 .  error
     72 .else
     73 .  error
     74 .endif
     75 
     76 
     77 # Spaces were allowed before var.c 1.631, not because it would make sense
     78 # but just as a side-effect from using strtoul.
     79 .if ${:L:localtime= 1} != ""
     80 .  error
     81 .endif
     82 
     83 
     84 # 0 means now; this differs from GNode.mtime, where a 0 means nonexistent.
     85 # Since "now" constantly changes, the strongest possible test is to match the
     86 # resulting pattern.
     87 .if !${:L:localtime=0:tW:M??? ??? ?? ??\:??\:?? 20??}
     88 .  error
     89 .endif
     90 
     91 
     92 .if ${:L:localtime=1} != "Thu Jan  1 01:00:01 1970"
     93 .  error
     94 .endif
     95 
     96 
     97 # INT32_MAX
     98 .if ${:L:localtime=2147483647} != "Tue Jan 19 04:14:07 2038"
     99 .  error
    100 .endif
    101 
    102 
    103 .if ${:L:localtime=2147483648} == "Tue Jan 19 04:14:08 2038"
    104 # All systems that have unsigned time_t or 64-bit time_t.
    105 .elif ${:L:localtime=2147483648} != "Fri Dec 13 21:45:52 1901"
    106 # FreeBSD-12.0-i386 still has 32-bit signed time_t.
    107 .else
    108 .  error
    109 .endif
    110 
    111 
    112 # Integer overflow, at least before var.c 1.631 from 2020-10-31.
    113 # Because this modifier is implemented using strtoul, the parsed time was
    114 # ULONG_MAX, which got converted to -1.  This resulted in a time stamp of
    115 # the second before 1970.
    116 #
    117 # Since var.c 1.613, the overflow is detected and produces a parse error.
    118 .if ${:L:localtime=10000000000000000000000000000000} != ""
    119 .  error
    120 .else
    121 .  error
    122 .endif
    123 
    124 # Before var.c 1.613 from 2020-10-31, there was no error handling while
    125 # parsing the :localtime modifier, thus no error message is printed.  Parsing
    126 # stopped after the '=', and the remaining string was parsed for more variable
    127 # modifiers.  Because of the unknown modifier 'e' from the 'error', the whole
    128 # variable value was discarded and thus not printed.
    129 .if ${:L:localtime=error} != ""
    130 .  error
    131 .else
    132 .  error
    133 .endif
    134 
    135 
    136 all:
    137