aboutsummaryrefslogtreecommitdiff
path: root/coreutils
diff options
context:
space:
mode:
Diffstat (limited to 'coreutils')
-rw-r--r--coreutils/who.c44
1 files changed, 28 insertions, 16 deletions
diff --git a/coreutils/who.c b/coreutils/who.c
index 85a0025c3..dfbb4c046 100644
--- a/coreutils/who.c
+++ b/coreutils/who.c
@@ -42,35 +42,47 @@ static void idle_string(char *str6, time_t t)
int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int who_main(int argc UNUSED_PARAM, char **argv)
{
- char str6[6];
struct utmp *ut;
- struct stat st;
- char *name;
unsigned opt;
opt_complementary = "=0";
- opt = getopt32(argv, "a");
+ opt = getopt32(argv, "aH");
+ if (opt & 2) // -H
+ printf("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST\n");
setutent();
- printf("USER TTY IDLE TIME HOST\n");
while ((ut = getutent()) != NULL) {
- if (ut->ut_user[0] && (opt || ut->ut_type == USER_PROCESS)) {
- time_t tmp;
- /* ut->ut_line is device name of tty - "/dev/" */
- name = concat_path_file("/dev", ut->ut_line);
+ if (ut->ut_user[0]
+ && ((opt & 1) || ut->ut_type == USER_PROCESS)
+ ) {
+ char str6[6];
+ char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1];
+ struct stat st;
+ time_t seconds;
+
str6[0] = '?';
str6[1] = '\0';
+ strcpy(name, "/dev/");
+ safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1,
+ ut->ut_line,
+ sizeof(ut->ut_line)+1
+ );
if (stat(name, &st) == 0)
idle_string(str6, st.st_atime);
/* manpages say ut_tv.tv_sec *is* time_t,
* but some systems have it wrong */
- tmp = ut->ut_tv.tv_sec;
- /* 15 chars for time: Nov 10 19:33:20 */
- printf("%-10s %-8s %-9s %-15.15s %s\n",
- ut->ut_user, ut->ut_line, str6,
- ctime(&tmp) + 4, ut->ut_host);
- if (ENABLE_FEATURE_CLEAN_UP)
- free(name);
+ seconds = ut->ut_tv.tv_sec;
+ /* How wide time field can be?
+ * "Nov 10 19:33:20": 15 chars
+ * "2010-11-10 19:33": 16 chars
+ */
+ printf("%-15.*s %-15.*s %-7s %-16.16s %.*s\n",
+ (int)sizeof(ut->ut_user), ut->ut_user,
+ (int)sizeof(ut->ut_line), ut->ut_line,
+ str6,
+ ctime(&seconds) + 4,
+ (int)sizeof(ut->ut_host), ut->ut_host
+ );
}
}
if (ENABLE_FEATURE_CLEAN_UP)