ref: 20a1d2268d69a0bbe66d0f21999649133878377c
dir: /sys/src/cmd/seconds.c/
#include <u.h> #include <libc.h> #include <ctype.h> char *knownfmt[] = { /* asctime */ "WW MMM DD hh:mm:ss ?Z YYYY", /* RFC3339 */ "YYYY-MM-DD[T]hh:mm:ss[Z]?Z", "YYYY-MM-DD[T]hh:mm:ss[Z]?Z", "YYYY-MM-DD[T]hh:mm:ss ?Z", "YYYY-MM-DD[T]hh:mm:ss?Z", nil, }; char *datefmt[] = { /* RFC5322 */ "?W ?DD ?MMM ?YYYY", "?W, DD-?MM-YY", /* RFC822/RFC2822 */ "DD MMM YYYY", "DD MMM YY", /* RFC850 */ "WW, DD-MMM-YY", /* RFC1123 */ "WWW, DD MMM YYYY", /* RFC 3339 and human-readable variants */ "YYYY-MM-DD", "YYYY-MM-DD [@] ", /* random formats */ "?W ?MMM ?DD ?YYYY", "?MMM ?DD ?YYYY", "?DD ?MM ?YYYY", "MMM ?DD ?YYYY", "YYYY ?MM ?DD", "YYYY ?DD ?MM", "YYYY/MM?/DD?", "MMM YYYY ?DD", "?DD YYYY MMM", "MM/DD/YYYY", nil }; char *timefmt[] = { " hh:mm:ss", " hh:mm", " hh", " hh:mm:ss ?A", " hh:mm ?A", " hh ?A", "", nil, }; char *zonefmt[] = { " ?Z", "", nil, }; static int nojunk(char *p) { while(isspace(*p)) p++; if(*p == '\0') return 1; werrstr("trailing junk"); return 0; } static void usage(void) { fprint(2, "usage: %s [-f fmt] date-time...\n", argv0); exits("usage"); } /* * seconds absolute_date ... - convert absolute_date to seconds since epoch */ void main(int argc, char **argv) { char **f, **df, **tf, **zf, *fmt, *ep, buf[256]; Tzone *tz; Tm tm; int i; fmt = nil; ARGBEGIN{ case 'f': fmt = EARGF(usage()); break; default: usage(); }ARGEND; if((tz = tzload("local")) == nil) sysfatal("bad local time: %r"); for(i = 0; i < argc; i++){ if(fmt != nil){ if(tmparse(&tm, fmt, argv[i], tz, &ep) && nojunk(ep)) goto Found; }else{ for(f = knownfmt; *f != nil; f++) if(tmparse(&tm, *f, argv[i], tz, &ep) != nil && nojunk(ep)) goto Found; for(df = datefmt; *df; df++) for(tf = timefmt; *tf; tf++) for(zf = zonefmt; *zf; zf++){ snprint(buf, sizeof(buf), "%s%s%s", *df, *tf, *zf); if(tmparse(&tm, buf, argv[i], tz, &ep) != nil && nojunk(ep)) goto Found; } } sysfatal("tmparse: %r"); Found: print("%lld\n", tmnorm(&tm)); } exits(nil); }