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#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "datetime.h"
#include "wait.h"
#include "fd.h"
#include "fmt.h"
#include "logmsg.h"
#include "buffer.h"
#include "exit.h"
#include "sig.h"
#define WHO "predate"
static char *montab[12] = {
"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"
};
char num[FMT_ULONG];
char outbuf[1024];
int main(int argc, char **argv)
{
time_t now;
struct tm *tm;
struct datetime dt;
datetime_sec utc;
datetime_sec local;
int minutes;
int pi[2];
buffer bo;
int wstat;
int pid;
sig_pipeignore();
if (!argv[1])
logmsg(WHO,100,USAGE,"predate child");
if (pipe(pi) == -1)
logmsg(WHO,111,FATAL,"unable to create pipe");
switch (pid = fork()) {
case -1:
logmsg(WHO,111,FATAL,"unable to fork");
case 0:
close(pi[1]);
if (fd_move(0,pi[0]) == -1)
logmsg(WHO,111,FATAL,"unable to set up fds");
sig_pipedefault();
execvp(argv[1],argv + 1);
logmsg(WHO,111,FATAL,B("unable to run: ",argv[1]));
}
close(pi[0]);
buffer_init(&bo,write,pi[1],outbuf,sizeof(outbuf));
time(&now);
tm = gmtime(&now);
dt.year = tm->tm_year;
dt.mon = tm->tm_mon;
dt.mday = tm->tm_mday;
dt.hour = tm->tm_hour;
dt.min = tm->tm_min;
dt.sec = tm->tm_sec;
utc = datetime_untai(&dt); /* utc == now, if gmtime ignores leap seconds */
tm = localtime(&now);
dt.year = tm->tm_year;
dt.mon = tm->tm_mon;
dt.mday = tm->tm_mday;
dt.hour = tm->tm_hour;
dt.min = tm->tm_min;
dt.sec = tm->tm_sec;
local = datetime_untai(&dt);
buffer_puts(&bo,"Date: ");
buffer_put(&bo,num,fmt_uint(num,dt.mday));
buffer_puts(&bo," ");
buffer_puts(&bo,montab[dt.mon]);
buffer_puts(&bo," ");
buffer_put(&bo,num,fmt_uint(num,dt.year + 1900));
buffer_puts(&bo," ");
buffer_put(&bo,num,fmt_uint0(num,dt.hour,2));
buffer_puts(&bo,":");
buffer_put(&bo,num,fmt_uint0(num,dt.min,2));
buffer_puts(&bo,":");
buffer_put(&bo,num,fmt_uint0(num,dt.sec,2));
if (local < utc) {
minutes = (utc - local + 30) / 60;
buffer_puts(&bo," -");
buffer_put(&bo,num,fmt_uint0(num,minutes / 60,2));
buffer_put(&bo,num,fmt_uint0(num,minutes % 60,2));
}
else {
minutes = (local - utc + 30) / 60;
buffer_puts(&bo," +");
buffer_put(&bo,num,fmt_uint0(num,minutes / 60,2));
buffer_put(&bo,num,fmt_uint0(num,minutes % 60,2));
}
buffer_puts(&bo,"\n");
buffer_copy(&bo,buffer_0);
buffer_flush(&bo);
close(pi[1]);
if (wait_pid(&wstat,pid) == -1)
logmsg(WHO,111,FATAL,"wait failed");
if (wait_crashed(wstat))
logmsg(WHO,111,FATAL,"child crashed");
_exit(wait_exitcode(wstat));
}
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