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varmod-localtime.mk revision 1.8 
      1 # $NetBSD: varmod-localtime.mk,v 1.8 2021/01/19 05:26:34 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 ${localtime:L:local%=gm%} != "gmtime"
     40 .  error
     41 .endif
     42 
     43 
     44 # As of 2020-08-16, it is not possible to pass the seconds via a
     45 # variable expression.  This is because parsing of the :localtime
     46 # modifier stops at the '$' 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 .if ${%Y:L:localtime=${:U1593536400}} != "mtime=11593536400}"
     58 .  error
     59 .endif
     60 
     61 
     62 # Before var.c 1.631 from 2020-10-31 21:40:20, it was possible to pass
     63 # negative time stamps to the :localtime modifier, resulting in dates before
     64 # 1970.  Going back 50 years in the past is not a practical use case for
     65 # make.  Therefore, since var.c 1.631, negative time stamps produce a
     66 # parse error.
     67 .if ${:L:localtime=-1} != ""
     68 .  error
     69 .else
     70 .  error
     71 .endif
     72 
     73 
     74 # Spaces were allowed before var.c 1.631 from 2020-10-31 21:40:20, not
     75 # because it would make sense but just as a side-effect from using strtoul.
     76 .if ${:L:localtime= 1} != ""
     77 .  error
     78 .endif
     79 
     80 
     81 # 0 means now; this differs from GNode.mtime, where a 0 means nonexistent.
     82 # Since "now" constantly changes, the strongest possible test is to match the
     83 # resulting pattern.
     84 .if !${:L:localtime=0:tW:M??? ??? ?? ??\:??\:?? 20??}
     85 .  error
     86 .endif
     87 
     88 
     89 .if ${:L:localtime=1} != "Thu Jan  1 01:00:01 1970"
     90 .  error
     91 .endif
     92 
     93 
     94 # INT32_MAX
     95 .if ${:L:localtime=2147483647} != "Tue Jan 19 04:14:07 2038"
     96 .  error
     97 .endif
     98 
     99 
    100 .if ${:L:localtime=2147483648} == "Tue Jan 19 04:14:08 2038"
    101 # All systems that have unsigned time_t or 64-bit time_t.
    102 .elif ${:L:localtime=2147483648} == "Fri Dec 13 21:45:52 1901"
    103 # FreeBSD-12.0-i386 still has 32-bit signed time_t, see
    104 # sys/x86/include/_types.h, __LP64__.
    105 #
    106 # Linux on 32-bit systems may still have 32-bit signed time_t, see
    107 # sysdeps/unix/sysv/linux/generic/bits/typesizes.h, __TIMESIZE.
    108 .else
    109 .  error
    110 .endif
    111 
    112 
    113 # Integer overflow, at least before var.c 1.631 from 2020-10-31.
    114 # Because this modifier is implemented using strtoul, the parsed time was
    115 # ULONG_MAX, which got converted to -1.  This resulted in a time stamp of
    116 # the second before 1970.
    117 #
    118 # Since var.c 1.631, the overflow is detected and produces a parse error.
    119 .if ${:L:localtime=10000000000000000000000000000000} != ""
    120 .  error
    121 .else
    122 .  error
    123 .endif
    124 
    125 # Before var.c 1.631 from 2020-10-31, there was no error handling while
    126 # parsing the :localtime modifier, thus no error message was printed.  Parsing
    127 # stopped after the '=', and the remaining string was parsed for more variable
    128 # modifiers.  Because of the unknown modifier 'e' from the 'error', the whole
    129 # variable value was discarded and thus not printed.
    130 .if ${:L:localtime=error} != ""
    131 .  error
    132 .else
    133 .  error
    134 .endif
    135 
    136 
    137 all:
    138