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 }