sys/src/cmd/seconds.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <ctype.h>
   4
   5 char *knownfmt[] = {
   6         /* asctime */
   7         "WW MMM DD hh:mm:ss ?Z YYYY",
   8         /* RFC3339 */
   9         "YYYY-MM-DD[T]hh:mm:ss[Z]?Z",
  10         "YYYY-MM-DD[T]hh:mm:ss[Z]?Z",
  11         "YYYY-MM-DD[T]hh:mm:ss ?Z",
  12         "YYYY-MM-DD[T]hh:mm:ss?Z",
  13         nil,
  14 };
  15
  16 char *datefmt[] = {
  17         /* RFC5322 */
  18         "?W ?DD ?MMM ?YYYY",
  19         "?W, DD-?MM-YY",
  20         /* RFC822/RFC2822 */
  21         "DD MMM YYYY",
  22         "DD MMM YY",
  23         /* RFC850 */
  24         "WW, DD-MMM-YY",
  25         /* RFC1123 */
  26         "WWW, DD MMM YYYY",
  27         /* RFC 3339 and human-readable variants */
  28         "YYYY-MM-DD",
  29         "YYYY-MM-DD [@] ",
  30         /* random formats */
  31         "?W ?MMM ?DD ?YYYY",
  32         "?MMM ?DD ?YYYY",
  33         "?DD ?MM ?YYYY",
  34         "MMM ?DD ?YYYY",
  35         "YYYY ?MM ?DD",
  36         "YYYY ?DD ?MM",
  37         "YYYY/MM?/DD?",
  38         "MMM YYYY ?DD",
  39         "?DD YYYY MMM",
  40         "MM/DD/YYYY",
  41         nil
  42 };
  43
  44 char *timefmt[] = {
  45         " hh:mm:ss",
  46         " hh:mm",
  47         " hh",
  48         " hh:mm:ss ?A",
  49         " hh:mm ?A",
  50         " hh ?A",
  51         "",
  52         nil,
  53 };
  54
  55 char *zonefmt[] = {
  56         " ?Z",
  57         "",
  58         nil,
  59 };
  60
  61 static int
  62 nojunk(char *p)
  63 {
  64         while(isspace(*p))
  65                 p++;
  66         if(*p == '\0')
  67                 return 1;
  68         werrstr("trailing junk");
  69         return 0;
  70 }
  71
  72 static void
  73 usage(void)
  74 {
  75         fprint(2, "usage: %s [-f fmt] date-time...\n", argv0);
  76         exits("usage");
  77 }
  78
  79 /*
  80  * seconds absolute_date ... - convert absolute_date to seconds since epoch
  81  */
  82 void
  83 main(int argc, char **argv)
  84 {
  85         char **f, **df, **tf, **zf, *fmt, *ep, buf[256];
  86         Tzone *tz;
  87         Tm tm;
  88         int i;
  89
  90         fmt = nil;
  91         ARGBEGIN{
  92         case 'f':
  93                 fmt = EARGF(usage());
  94                 break;
  95         default:
  96                 usage();
  97         }ARGEND;
  98
  99         if((tz = tzload("local")) == nil)
 100                 sysfatal("bad local time: %r");
 101         for(i = 0; i < argc; i++){
 102                 if(fmt != nil){
 103                         if(tmparse(&tm, fmt, argv[i], tz, &ep) && nojunk(ep))
 104                                 goto Found;
 105                 }else{
 106                         for(f = knownfmt; *f != nil; f++)
 107                                 if(tmparse(&tm, *f, argv[i], tz, &ep) != nil && nojunk(ep))
 108                                         goto Found;
 109                         for(df = datefmt; *df; df++)
 110                         for(tf = timefmt; *tf; tf++)
 111                         for(zf = zonefmt; *zf; zf++){
 112                                 snprint(buf, sizeof(buf), "%s%s%s", *df, *tf, *zf);
 113                                 if(tmparse(&tm, buf, argv[i], tz, &ep) != nil && nojunk(ep))
 114                                         goto Found;
 115                         }
 116                 }
 117                 sysfatal("tmparse: %r");
 118 Found:
 119                 print("%lld\n", tmnorm(&tm));
 120         }
 121         exits(nil);
 122 }