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/* nwho.c */
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <utmp.h>
#include <errno.h>
#include <sys/wait.h>
#include "all_defs.h"
#define S(a,b) str_copy(a,b)
#define SN(a,b,c) str_copynz(a,b,c)
#define SF(a,b,c) fmt_str_(a,b,c)
#define N(a,b,c,d) fmt_nmb_(a,b,c,d)
void usage(char *buf) {
write(1,buf,str_copy(buf, "usage: nwho [-alpquw] [file]\n"));
_exit(1);
}
int main(int argc, char **argv) {
struct utmp ut[1];
struct tm *tm;
struct stat st;
char *montab = "JanFebMarAprMayJunJulAugSepOctNovDec";
char buf[1024];
time_t id;
char *ipasc, mesg, *p;
unsigned char flagaddr = 0;
char flagpid = 0;
char flagcheck = 1;
char flagup = 0;
char flagmesg = 0;
int fd;
argc--; argv++;
while (argc>0) {
p = argv[0];
if (*p != '-') break;
for (++p; *p; ++p)
switch (*p) {
case 'q': flagcheck = 0; break;
case 'l': ++flagaddr; break;
case 'p': flagpid = 1; break;
case 'u': flagup = 1; break;
case 'w': flagmesg = 1; break;
case 'a': flagup=1; flagpid=1; ++flagaddr; flagmesg=1; break;
default: usage(buf);
}
argc--; argv++;
}
if (argc>0) p = argv[0];
else p = _PATH_UTMP;
fd = open(p, O_RDONLY);
if (fd == -1) {write(1,"error open input\n",17); _exit(1);}
while (utmp_io(fd, ut, F_RDLCK)) {
if (ut->ut_type != USER_PROCESS) continue;
if (flagcheck)
if (kill(ut->ut_pid, 0) && errno == ESRCH) continue;
id = ut->ut_tv.tv_sec;
id += get_tz(id);
tm = nv_gmtime(&id);
mesg = '?';
id = -1;
S(buf, "/dev/");
buf[5 + SN(buf+5, ut->ut_line, UT_LINESIZE)] = '\0';
if (!stat(buf, &st)) {
if ((st.st_mode & 0020) == 0020) mesg = '+';
else mesg = '-';
id = (time(0) - st.st_mtime)/60;
}
/*----------------------------------------------*/
p = buf;
p += SF(p, ut->ut_user,12);
if (flagmesg) {
*p++ = mesg; *p++ = ' ';}
p += SF(p, ut->ut_line, 7); *p++ = ' ';
if (flagpid) {
p += N(p, ut->ut_pid, 5,0); *p++ = ' ';}
p += SN(p, montab + (tm->tm_mon)*3, 3); *p++ = ' ';
p += N(p, tm->tm_mday, 2,0); *p++ = ' ';
p += N(p, tm->tm_hour, 2,0); *p++ = ':';
p += N(p, tm->tm_min, 2,1); *p++ = ' ';
if (flagup) {
if (id >= 24*60) {
id /= 60;
p += N(p, id/24, 3,0); p += S(p,"d+");
p += N(p, id%24, 2,1); p += S(p,"h ");
} else if (id > 0) {
p += N(p, id/60, 2,0); *p++ = ':';
p += N(p, id%60, 2,1); *p++ = ' ';
} else if (id == 0) {
p += SF(p," .",6);
} else
p += SF(p," ?",6);
}
*p++ = '(';
if (ut->ut_addr) {
unsigned char *z = (unsigned char *)&ut->ut_addr;
int k;
ipasc = p;
for (k=0; k<4; k++) {
p += fmt_ulong(p, (unsigned long)z[k]);
*p++ = '.';
}
*--p = 0;
} else ipasc = "";
if (flagaddr>1 ||
(flagaddr && str_diffn(ipasc, ut->ut_host, 20))) {
*p++ = '=';
p += SN(p,ut->ut_host,90);
}
*p++ = ')'; *p++ = '\n';
write(1,buf, p-buf);
}
close(fd);
return 0;
}
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