sys/src/cmd/seconds.c

   1 #include <u.h>
   2 #include <libc.h>
   3
   4 char *knownfmt[] = {
   5         /* asctime */
   6         "WW MMM DD hh:mm:ss ?Z YYYY",
   7         /* RFC3339 */
   8         "YYYY-MM-DD[T]hh:mm:ss[Z]?Z",
   9         "YYYY-MM-DD[T]hh:mm:ss[Z]?Z",
  10         "YYYY-MM-DD[T]hh:mm:ss ?Z",
  11         "YYYY-MM-DD[T]hh:mm:ss?Z",
  12         nil,
  13 };
  14
  15 char *datefmt[] = {
  16         /* RFC5322 */
  17         "?W ?DD ?MMM ?YYYY",
  18         "?W, DD-?MM-YY",
  19         /* RFC822/RFC2822 */
  20         "DD MMM YYYY",
  21         "DD MMM YY",
  22         /* RFC850 */
  23         "WW, DD-MMM-YY",
  24         /* RFC1123 */
  25         "WWW, DD MMM YYYY",
  26         /* RFC 3339 and human-readable variants */
  27         "YYYY-MM-DD",
  28         "YYYY-MM-DD [@] ",
  29         /* random formats */
  30         "?W ?MMM ?DD ?YYYY",
  31         "?MMM ?DD ?YYYY",
  32         "?DD ?MM ?YYYY",
  33         "MMM ?DD ?YYYY",
  34         "YYYY ?MM ?DD",
  35         "YYYY ?DD ?MM",
  36         "YYYY/MM?/DD?",
  37         "MMM YYYY ?DD",
  38         "?DD YYYY MMM",
  39         "MM/DD/YYYY",
  40         nil
  41 };
  42
  43 char *timefmt[] = {
  44         " hh:mm:ss",
  45         " hh:mm",
  46         " hh",
  47         " hh:mm:ss ?A",
  48         " hh:mm ?A",
  49         " hh ?A",
  50         "",
  51         nil,
  52 };
  53
  54 char *zonefmt[] = {
  55         " ?Z",
  56         "",
  57         nil,
  58 };
  59
  60
  61 static void
  62 usage(void)
  63 {
  64         fprint(2, "usage: %s [-f fmt] date-time/win m...\n", argv0);
  65         exits("usage");
  66 }
  67
  68 /*
  69  * seconds absolute_date ... - convert absolute_date to seconds since epoch
  70  */
  71 void
  72 main(int argc, char **argv)
  73 {
  74         char **f, **df, **tf, **zf, *fmt, *ep, buf[256];
  75         Tzone *tz;
  76         Tm tm;
  77         int i;
  78
  79         fmt = nil;
  80         ARGBEGIN{
  81         case 'f':
  82                 fmt = EARGF(usage());
  83                 break;
  84         default:
  85                 usage();
  86         }ARGEND;
  87
  88         if((tz = tzload("local")) == nil)
  89                 sysfatal("bad local time: %r");
  90         for(i = 0; i < argc; i++){
  91                 if(fmt != nil){
  92                         if(tmparse(&tm, fmt, argv[i], tz, &ep) != nil && *ep == 0)
  93                                 goto Found;
  94                 }else{
  95                         for(f = knownfmt; *f != nil; f++)
  96                                 if(tmparse(&tm, *f, argv[i], tz, &ep) != nil && *ep == 0)
  97                                         goto Found;
  98                         for(df = datefmt; *df; df++)
  99                         for(tf = timefmt; *tf; tf++)
 100                         for(zf = zonefmt; *zf; zf++){
 101                                 snprint(buf, sizeof(buf), "%s%s%s", *df, *tf, *zf);
 102                                 if(tmparse(&tm, buf, argv[i], tz, &ep) != nil && *ep == 0)
 103                                         goto Found;
 104                         }
 105                 }
 106                 if(*ep == 0)
 107                         sysfatal("tmparse: %r");
 108                 else
 109                         sysfatal("tmparse: trailing junk");
 110 Found:
 111                 print("%lld\n", tmnorm(&tm));
 112         }
 113         exits(nil);
 114 }