| 1 | #include <sys/types.h> |
| 2 | #include <time.h> |
| 3 | #include "datetime.h" |
| 4 | #include "fork.h" |
| 5 | #include "wait.h" |
| 6 | #include "fd.h" |
| 7 | #include "fmt.h" |
| 8 | #include "strerr.h" |
| 9 | #include "substdio.h" |
| 10 | #include "subfd.h" |
| 11 | #include "readwrite.h" |
| 12 | #include "exit.h" |
| 13 | |
| 14 | #define FATAL "predate: fatal: " |
| 15 | |
| 16 | static char *montab[12] = { |
| 17 | "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec" |
| 18 | }; |
| 19 | |
| 20 | char num[FMT_ULONG]; |
| 21 | char outbuf[1024]; |
| 22 | |
| 23 | void main(argc,argv) |
| 24 | int argc; |
| 25 | char **argv; |
| 26 | { |
| 27 | time_t now; |
| 28 | struct tm *tm; |
| 29 | struct datetime dt; |
| 30 | datetime_sec utc; |
| 31 | datetime_sec local; |
| 32 | int minutes; |
| 33 | int pi[2]; |
| 34 | substdio ss; |
| 35 | int wstat; |
| 36 | int pid; |
| 37 | |
| 38 | sig_pipeignore(); |
| 39 | |
| 40 | if (!argv[1]) |
| 41 | strerr_die1x(100,"predate: usage: predate child"); |
| 42 | |
| 43 | if (pipe(pi) == -1) |
| 44 | strerr_die2sys(111,FATAL,"unable to create pipe: "); |
| 45 | |
| 46 | switch(pid = fork()) { |
| 47 | case -1: |
| 48 | strerr_die2sys(111,FATAL,"unable to fork: "); |
| 49 | case 0: |
| 50 | close(pi[1]); |
| 51 | if (fd_move(0,pi[0]) == -1) |
| 52 | strerr_die2sys(111,FATAL,"unable to set up fds: "); |
| 53 | sig_pipedefault(); |
| 54 | execvp(argv[1],argv + 1); |
| 55 | strerr_die4sys(111,FATAL,"unable to run ",argv[1],": "); |
| 56 | } |
| 57 | close(pi[0]); |
| 58 | substdio_fdbuf(&ss,write,pi[1],outbuf,sizeof(outbuf)); |
| 59 | |
| 60 | time(&now); |
| 61 | |
| 62 | tm = gmtime(&now); |
| 63 | dt.year = tm->tm_year; |
| 64 | dt.mon = tm->tm_mon; |
| 65 | dt.mday = tm->tm_mday; |
| 66 | dt.hour = tm->tm_hour; |
| 67 | dt.min = tm->tm_min; |
| 68 | dt.sec = tm->tm_sec; |
| 69 | utc = datetime_untai(&dt); /* utc == now, if gmtime ignores leap seconds */ |
| 70 | |
| 71 | tm = localtime(&now); |
| 72 | dt.year = tm->tm_year; |
| 73 | dt.mon = tm->tm_mon; |
| 74 | dt.mday = tm->tm_mday; |
| 75 | dt.hour = tm->tm_hour; |
| 76 | dt.min = tm->tm_min; |
| 77 | dt.sec = tm->tm_sec; |
| 78 | local = datetime_untai(&dt); |
| 79 | |
| 80 | substdio_puts(&ss,"Date: "); |
| 81 | substdio_put(&ss,num,fmt_uint(num,dt.mday)); |
| 82 | substdio_puts(&ss," "); |
| 83 | substdio_puts(&ss,montab[dt.mon]); |
| 84 | substdio_puts(&ss," "); |
| 85 | substdio_put(&ss,num,fmt_uint(num,dt.year + 1900)); |
| 86 | substdio_puts(&ss," "); |
| 87 | substdio_put(&ss,num,fmt_uint0(num,dt.hour,2)); |
| 88 | substdio_puts(&ss,":"); |
| 89 | substdio_put(&ss,num,fmt_uint0(num,dt.min,2)); |
| 90 | substdio_puts(&ss,":"); |
| 91 | substdio_put(&ss,num,fmt_uint0(num,dt.sec,2)); |
| 92 | |
| 93 | if (local < utc) { |
| 94 | minutes = (utc - local + 30) / 60; |
| 95 | substdio_puts(&ss," -"); |
| 96 | substdio_put(&ss,num,fmt_uint0(num,minutes / 60,2)); |
| 97 | substdio_put(&ss,num,fmt_uint0(num,minutes % 60,2)); |
| 98 | } |
| 99 | else { |
| 100 | minutes = (local - utc + 30) / 60; |
| 101 | substdio_puts(&ss," +"); |
| 102 | substdio_put(&ss,num,fmt_uint0(num,minutes / 60,2)); |
| 103 | substdio_put(&ss,num,fmt_uint0(num,minutes % 60,2)); |
| 104 | } |
| 105 | |
| 106 | substdio_puts(&ss,"\n"); |
| 107 | substdio_copy(&ss,subfdin); |
| 108 | substdio_flush(&ss); |
| 109 | close(pi[1]); |
| 110 | |
| 111 | if (wait_pid(&wstat,pid) == -1) |
| 112 | strerr_die2sys(111,FATAL,"wait failed: "); |
| 113 | if (wait_crashed(wstat)) |
| 114 | strerr_die2x(111,FATAL,"child crashed"); |
| 115 | _exit(wait_exitcode(wstat)); |
| 116 | } |