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#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#include "buffer.h"
#include "exit.h"
#include "fd.h"
#include "fmt.h"
#include "logmsg.h"
#include "sig.h"
#include "wait.h"
#include "datetime.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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