[hackers] [sbase] Implement -G support for id(1) || sin

From: <git_AT_suckless.org>
Date: Sun, 01 Dec 2013 18:30:04 +0100

commit 5534e607038648e7692b1e232d5825d966219028
Author: sin <sin_AT_2f30.org>
Date: Sun Dec 1 17:29:20 2013 +0000

    Implement -G support for id(1)

diff --git a/id.1 b/id.1
index 6bfa06b..967022c 100644
--- a/id.1
+++ b/id.1
_AT_@ -3,10 +3,16 @@
 id \- print real and effective user and group IDs
 .SH SYNOPSIS
 .B id
+.RB [ -G ]
 .RB [ user | uid ]
 .SH DESCRIPTION
 Print user and group information of the calling process to standard output.
 If a login name or uid is specified, the user and group information of that
 user is displayed.
+.SH OPTIONS
+.TP
+.B \-G
+Display group information as whitespace separated numbers, in no particular
+order.
 .SH SEE ALSO
 .IR who(1)
diff --git a/id.c b/id.c
index 78fa71d..225c254 100644
--- a/id.c
+++ b/id.c
_AT_@ -10,6 +10,7 @@
 #include <ctype.h>
 #include "util.h"
 
+static void groupid(struct passwd *pw);
 static void user(struct passwd *pw);
 static void userid(uid_t id);
 static void usernam(const char *nam);
_AT_@ -17,13 +18,18 @@ static void usernam(const char *nam);
 static void
 usage(void)
 {
- eprintf("usage: %s [user | uid]
", argv0);
+ eprintf("usage: %s [-G] [user | uid]
", argv0);
 }
 
+static int Gflag = 0;
+
 int
 main(int argc, char *argv[])
 {
         ARGBEGIN {
+ case 'G':
+ Gflag = 1;
+ break;
         default:
                 usage();
         } ARGEND;
_AT_@ -47,7 +53,26 @@ main(int argc, char *argv[])
         return EXIT_SUCCESS;
 }
 
-static void usernam(const char *nam)
+static void
+groupid(struct passwd *pw)
+{
+ gid_t gid, groups[NGROUPS_MAX];
+ int ngroups;
+ int i;
+
+ ngroups = NGROUPS_MAX;
+ getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
+ for (i = 0; i < ngroups; i++) {
+ gid = groups[i];
+ printf("%u", gid);
+ if (i < ngroups - 1)
+ putchar(' ');
+ }
+ putchar('
');
+}
+
+static void
+usernam(const char *nam)
 {
         struct passwd *pw;
 
_AT_@ -57,10 +82,14 @@ static void usernam(const char *nam)
                 eprintf("getpwnam %s:", nam);
         else if (!pw)
                 eprintf("getpwnam %s: no such user
", nam);
- user(pw);
+ if (Gflag)
+ groupid(pw);
+ else
+ user(pw);
 }
 
-static void userid(uid_t id)
+static void
+userid(uid_t id)
 {
         struct passwd *pw;
 
_AT_@ -70,7 +99,10 @@ static void userid(uid_t id)
                 eprintf("getpwuid %d:", id);
         else if (!pw)
                 eprintf("getpwuid %d: no such user
", id);
- user(pw);
+ if (Gflag)
+ groupid(pw);
+ else
+ user(pw);
 }
 
 static void
Received on Sun Dec 01 2013 - 18:30:04 CET