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Added -l flag to "last" command. When used it allows "last" to

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display usernames longer than 8 characters long.
This commit is contained in:
Jesse Smith 2018-10-30 21:46:04 -03:00
parent be8e6b9e1c
commit 44fce86dde
3 changed files with 54 additions and 3 deletions
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4
doc/Changelog
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@ -27,7 +27,9 @@ sysvinit (2.92) unreleased; urgency=low
* shutdown command was setting environment variable INIT_HALT to
"POWERDOWN", this should have been "POWERDOWN" as specified in the
manual page. Fixed code to match manual page and init scripts.
Closes Debian bugs #717531 and ##590895
* Added -l flag to "last" command. When used it allows "last" to
display usernames longer than 8 characters long.
sysvinit (2.91) world; urgency=low

4
man/last.1
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@ -93,6 +93,10 @@ Print full login and logout times and dates.
.IP \fB\-i\fP
This option is like \fB-d\fP in that it displays the IP number of the remote
host, but it displays the IP number in numbers-and-dots notation.
.IP \fB\-l\fP
This option allows the display of usernames longer than 8 characters.
This may mess up formatting in some programs and make the output wider than
the standard 80 characters.
.IP \fB\-o\fP
Read an old-type wtmp file (written by linux-libc5 applications).
.IP \fB\-w\fP

47
src/last.c
View File

@ -77,6 +77,7 @@ int maxrecs = 0; /* Maximum number of records to list. */
int recsdone = 0; /* Number of records listed */
int showhost = 1; /* Show hostname too? */
int altlist = 0; /* Show hostname at the end. */
int allow_long_username = 0; /* Show usernames longer than 8 characters */
int usedns = 0; /* Use DNS to lookup the hostname. */
int useip = 0; /* Print IP address in number format */
int fulltime = 0; /* Print full dates and times */
@ -470,28 +471,69 @@ int list(struct utmp *p, time_t t, int what)
if (!usedns && (s = strchr(p->ut_host, '.')) != NULL &&
strcmp(s + 1, domainname) == 0) *s = 0;
#endif
#define str(s) # s
#define xstr(s) str(s)
if (!altlist) {
if (allow_long_username)
{
len = snprintf(final, sizeof(final),
oldfmt ? "%-" xstr(OLD_NAMESIZE) "." xstr(OLD_NAMESIZE) "s %-12.12s "
"%-16.16s %-16.16s %-7.7s %-12.12s\n"
: "%-" xstr(UT_NAMESIZE) "." xstr(UT_NAMESIZE) "s %-12.12s "
"%-16.16s %-16.16s %-7.7s %-12.12s\n",
p->ut_name, utline,
domain, logintime, logouttime, length);
}
else /* show short username */
{
len = snprintf(final, sizeof(final),
fulltime ?
"%-8.*s %-12.12s %-16.*s %-24.24s %-26.26s %-12.12s\n" :
"%-8.*s %-12.12s %-16.*s %-16.16s %-7.7s %-12.12s\n",
name_len, p->ut_name, utline,
domain_len, domain, logintime, logouttime, length);
} /* show short username */
} else {
if (allow_long_username)
{
len = snprintf(final, sizeof(final),
oldfmt ? "%-" xstr(OLD_NAMESIZE) "." xstr(OLD_NAMESIZE) "s %-12.12s "
"%-16.16s %-7.7s %-16.16s %s\n"
: "%-" xstr(UT_NAMESIZE) "." xstr(UT_NAMESIZE) "s %-12.12s "
"%-16.16s %-7.7s %-16.16s %s\n",
p->ut_name, utline,
logintime, logouttime, length, domain);
}
else /* show short username */
{
len = snprintf(final, sizeof(final),
fulltime ?
"%-8.*s %-12.12s %-24.24s %-26.26s %-12.12s %s\n" :
"%-8.*s %-12.12s %-16.16s %-7.7s %-12.12s %s\n",
name_len, p->ut_name, utline,
logintime, logouttime, length, domain);
} /* done showing short username */
}
} else
if (allow_long_username)
{
len = snprintf(final, sizeof(final),
oldfmt ? "%-" xstr(OLD_NAMESIZE) "." xstr(OLD_NAMESIZE) "s %-12.12s "
"%-16.16s %-7.7s %-12.12s\n"
: "%-" xstr(UT_NAMESIZE) "." xstr(UT_NAMESIZE) "s %-12.12s "
"%-16.16s %-7.7s %-12.12s\n",
p->ut_name, utline,
logintime, logouttime, length);
}
else /* show short username */
{
len = snprintf(final, sizeof(final),
fulltime ?
"%-8.*s %-12.12s %-24.24s %-26.26s %-12.12s\n" :
"%-8.*s %-12.12s %-16.16s %-7.7s %-12.12s\n",
name_len, p->ut_name, utline,
logintime, logouttime, length);
} /* end of showing short username */
#if defined(__GLIBC__)
# if (__GLIBC__ == 2) && (__GLIBC_MINOR__ == 0)
@ -598,7 +640,7 @@ int main(int argc, char **argv)
progname = mybasename(argv[0]);
/* Process the arguments. */
while((c = getopt(argc, argv, "f:n:RxadFiot:0123456789w")) != EOF)
while((c = getopt(argc, argv, "f:n:RxadFliot:0123456789w")) != EOF)
switch(c) {
case 'R':
showhost = 0;
@ -632,6 +674,9 @@ int main(int argc, char **argv)
case 'F':
fulltime++;
break;
case 'l':
allow_long_username = 1;
break;
case 't':
if ((until = parsetm(optarg)) == (time_t)-1) {
fprintf(stderr, "%s: Invalid time value \"%s\"\n",