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id(1) can handle uid arguments

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This commit is contained in:
Rob Pilling 2013-12-01 11:40:49 +00:00 committed by sin
parent fd8c3b6438
commit d453be2ae1
2 changed files with 39 additions and 18 deletions
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6
id.1
View File

@ -3,10 +3,10 @@
id \- print real and effective user and group IDs
.SH SYNOPSIS
.B id
.RB [ user ]
.RB [ user | uid ]
.SH DESCRIPTION
Print user and group information of the calling process to standard output.
If a login name is specified, the user and group information of that user
is displayed.
If a login name or uid is specified, the user and group information of that
user is displayed.
.SH SEE ALSO
.IR who(1)

51
id.c
View File

@ -7,21 +7,22 @@
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <ctype.h>
#include "util.h"
static void user(struct passwd *pw);
static void userid(uid_t id);
static void usernam(const char *nam);
static void
usage(void)
{
eprintf("usage: %s [user]\n", argv0);
eprintf("usage: %s [user | uid]\n", argv0);
}
int
main(int argc, char *argv[])
{
struct passwd *pw;
ARGBEGIN {
default:
usage();
@ -30,20 +31,14 @@ main(int argc, char *argv[])
errno = 0;
switch (argc) {
case 0:
pw = getpwuid(getuid());
if (errno != 0)
eprintf("getpwuid %d:", getuid());
else if (!pw)
eprintf("getpwuid %d: no such user\n", getuid());
user(pw);
userid(getuid());
break;
case 1:
pw = getpwnam(argv[0]);
if (errno != 0)
eprintf("getpwnam %s:", argv[0]);
else if (!pw)
eprintf("getpwnam %s: no such user\n", argv[0]);
user(pw);
/* user names can't begin [0-9] */
if (isdigit(argv[0][0]))
userid(estrtol(argv[0], 0));
else
usernam(argv[0]);
break;
default:
usage();
@ -52,6 +47,32 @@ main(int argc, char *argv[])
return EXIT_SUCCESS;
}
static void usernam(const char *nam)
{
struct passwd *pw;
errno = 0;
pw = getpwnam(nam);
if (errno != 0)
eprintf("getpwnam %s:", nam);
else if (!pw)
eprintf("getpwnam %s: no such user\n", nam);
user(pw);
}
static void userid(uid_t id)
{
struct passwd *pw;
errno = 0;
pw = getpwuid(id);
if (errno != 0)
eprintf("getpwuid %d:", id);
else if (!pw)
eprintf("getpwuid %d: no such user\n", id);
user(pw);
}
static void
user(struct passwd *pw)
{