Tito writes:

Hi Erik,
Hi to all,
This is part five of the my_get*id story.
I've tweaked a bit this two functions to make them more flexible,
but this changes will not affect existing code.
Now they work so:
1) my_getpwuid( char *user, uid_t uid, int bufsize)

   if bufsize is > 0 char *user cannot be set to NULL
                     on success username is written on static allocated buffer
                     on failure uid as string is written to buffer and NULL is returned
   if bufsize is = 0 char *user can be set to NULL
                     on success username is returned
                     on failure NULL is returned
   if bufsize is < 0 char *user can be set to NULL
                     on success username is returned
                     on failure an error message is printed and the program exits

  2) 1) my_getgrgid( char *group, uid_t uid, int bufsize)

   if bufsize is > 0 char *group cannot be set to NULL
                     on success groupname is written on static allocated buffer
                     on failure gid as string is written to buffer and NULL is returned
   if bufsize is = 0 char *group can be set to NULL
                     on success groupname is returned
                     on failure NULL is returned
   if bufsize is < 0 char *group can be set to nULL
                     on success groupname is returned
                     on failure an error message is printed and the program exits

This changes were needed mainly for my new id applet.
It is somewhat bigger then the previous but matches the behaviour of GNU id
and is capable to handle usernames of whatever length.
BTW: at a first look it seems to me that it will integrate well (with just a few changes)
with the pending patch  in patches/id_groups_alias.patch.
The increase in size is balanced by the removal of my_getpwnamegid.c
from libbb as this was used only in previous id applet and by size optimizations
made possible in whoami.c and in passwd.c.
I know that we are in feature freeze but I think that i've tested it enough
(at least I hope so.......).

7 files changed, 149 insertions, 80 deletions

diff --git a/coreutils/id.c b/coreutils/id.c
index db8afc585..76331e48f 100644
--- a/coreutils/id.c
+++ b/coreutils/id.c
@@ -21,90 +21,121 @@
  */
 
 /* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */
+/* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to
+ * be more similar to GNU id. 
+ */
 
 #include "busybox.h"
+#include "grp_.h"
+#include "pwd_.h"
 #include <stdio.h>
 #include <unistd.h>
 #include <getopt.h>
 #include <string.h>
 #include <sys/types.h>
+
 #ifdef CONFIG_SELINUX
 #include <proc_secure.h>
 #include <flask_util.h>
 #endif
 
-#define JUST_USER         1
-#define JUST_GROUP        2
-#define PRINT_REAL        4
-#define NAME_NOT_NUMBER   8
+#define PRINT_REAL        1
+#define NAME_NOT_NUMBER   2
+#define JUST_USER         4
+#define JUST_GROUP        8
+
+void printf_full(unsigned int id, char *arg, char prefix)
+{	
+	printf("%cid=%u",prefix, id);
+	if(arg)
+		printf("(%s) ", arg);
+}
 
 extern int id_main(int argc, char **argv)
 {
-	char user[32], group[32];
-	long pwnam, grnam;
-	int uid, gid;
+	struct passwd *p;
+	char *user;
+	char *group;
+	uid_t uid;
+	gid_t gid;
 	int flags;
 #ifdef CONFIG_SELINUX
 	int is_flask_enabled_flag = is_flask_enabled();
 #endif
 
-	flags = bb_getopt_ulflags(argc, argv, "ugrn");
+	bb_opt_complementaly = "u~g:g~u";
+	flags = bb_getopt_ulflags(argc, argv, "rnug");
 
-	if (((flags & (JUST_USER | JUST_GROUP)) == (JUST_USER | JUST_GROUP))
-		|| (argc > optind + 1)
-	) {
+	if ((flags & 0x80000000UL)
+	 /* Don't allow -n -r -nr */
+	|| (flags <= 3 && flags > 0) 
+	|| (argc > optind + 1))
 		bb_show_usage();
+	
+	/* This values could be overwritten later */
+	uid = geteuid();
+	gid = getegid();
+	if (flags & PRINT_REAL) {
+		uid = getuid();
+		gid = getgid();
 	}
+	
+	if(argv[optind])
+	{
 
-	if (argv[optind] == NULL) {
-		if (flags & PRINT_REAL) {
-			uid = getuid();
-			gid = getgid();
-		} else {
-			uid = geteuid();
-			gid = getegid();
-		}
-		my_getpwuid(user, uid, sizeof(user));
-	} else {
-		safe_strncpy(user, argv[optind], sizeof(user));
-	    gid = my_getpwnamegid(user);
+		p=getpwnam(argv[optind]);
+		/* this is needed because it exits on failure */
+		uid = my_getpwnam(argv[optind]);
+		gid = p->pw_gid;
+		/* in this case PRINT_REAL is the same */ 
 	}
-	my_getgrgid(group, gid, sizeof(group));
+	
+	user=my_getpwuid(NULL, uid, (flags & JUST_USER) ? -1 : 0);
 
-	pwnam=my_getpwnam(user);
-	grnam=my_getgrnam(group);
+	if(flags & JUST_USER)
+	{
+		gid=uid;
+		group=user;
+		goto PRINT; 
+	}
+	
+	group=my_getgrgid(NULL, gid, (flags & JUST_GROUP) ? -1 : 0);
 
-	if (flags & (JUST_GROUP | JUST_USER)) {
-		char *s = group;
-		if (flags & JUST_USER) {
-			s = user;
-			grnam = pwnam;
-		}
-		if (flags & NAME_NOT_NUMBER) {
-			puts(s);
-		} else {
-			printf("%ld\n", grnam);
-		}
-	} else {
-#ifdef CONFIG_SELINUX
-		printf("uid=%ld(%s) gid=%ld(%s)", pwnam, user, grnam, group);
-		if(is_flask_enabled_flag)
-		{
-			security_id_t mysid = getsecsid();
-			char context[80];
-			int len = sizeof(context);
-			context[0] = '\0';
-			if(security_sid_to_context(mysid, context, &len))
-				strcpy(context, "unknown");
-			printf(" context=%s\n", context);
-		}
+	if(flags & JUST_GROUP) 
+	{
+PRINT:		
+		if(flags & NAME_NOT_NUMBER)
+			puts(group);
 		else
-			printf("\n");
-#else
-		printf("uid=%ld(%s) gid=%ld(%s)\n", pwnam, user, grnam, group);
+			printf ("%u\n", gid);
+		bb_fflush_stdout_and_exit(EXIT_SUCCESS);
+	}
+	
+	/* Print full info like GNU id */
+	printf_full(uid, user, 'u');
+	printf_full(gid, group, 'g');
+#ifdef CONFIG_SELINUX
+	if(is_flask_enabled_flag)
+	{
+		security_id_t mysid = getsecsid();
+		char context[80];
+		int len = sizeof(context);
+		context[0] = '\0';
+		if(security_sid_to_context(mysid, context, &len))
+			strcpy(context, "unknown");
+		printf("context=%s", context);
+	}
 #endif
+	puts("");
+	bb_fflush_stdout_and_exit((user && group) ? EXIT_SUCCESS : EXIT_FAILURE);
+}
 
-	}
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
 
-	bb_fflush_stdout_and_exit(0);
-}
diff --git a/coreutils/whoami.c b/coreutils/whoami.c
index c979b0dd9..6a6e2eec9 100644
--- a/coreutils/whoami.c
+++ b/coreutils/whoami.c
@@ -26,21 +26,13 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include "busybox.h"
-#include "pwd_.h"
-#include "grp_.h"
 
 extern int whoami_main(int argc, char **argv)
 {
-	struct passwd *p;
-	uid_t uid;
-	
 	if (argc > 1)
 		bb_show_usage();
 
-	uid = geteuid();
-	if((p = getpwuid(uid))!=NULL) {
-		puts(p->pw_name);
-		bb_fflush_stdout_and_exit(EXIT_SUCCESS);
-	}
-	bb_error_msg_and_die("cannot find username for UID %u", (unsigned) uid);
+	puts(my_getpwuid(NULL, geteuid(), -1));
+	/* exits on error */
+	bb_fflush_stdout_and_exit(EXIT_SUCCESS);
 }
diff --git a/include/libbb.h b/include/libbb.h
index 78b9711e8..51afd1e9d 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -232,7 +232,6 @@ extern long my_getpwnam(const char *name);
 extern long my_getgrnam(const char *name);
 extern char * my_getpwuid(char *name, long uid, int bufsize);
 extern char * my_getgrgid(char *group, long gid, int bufsize);
-extern long my_getpwnamegid(const char *name);
 extern char *bb_askpass(int timeout, const char * prompt);
 
 extern int device_open(const char *device, int mode);
diff --git a/libbb/Makefile.in b/libbb/Makefile.in
index f993b21ea..26ed5b132 100644
--- a/libbb/Makefile.in
+++ b/libbb/Makefile.in
@@ -34,7 +34,7 @@ LIBBB_SRC:= \
 	human_readable.c inet_common.c inode_hash.c interface.c isdirectory.c \
 	kernel_version.c last_char_is.c llist_add_to.c login.c loop.c \
 	make_directory.c mode_string.c module_syscalls.c mtab.c mtab_file.c \
-	my_getgrgid.c my_getgrnam.c my_getpwnam.c my_getpwnamegid.c \
+	my_getgrgid.c my_getgrnam.c my_getpwnam.c \
 	my_getpwuid.c obscure.c parse_mode.c parse_number.c perror_msg.c \
 	perror_msg_and_die.c print_file.c get_console.c \
 	process_escape_sequence.c procps.c pwd2spwd.c pw_encrypt.c qmodule.c \
diff --git a/libbb/my_getgrgid.c b/libbb/my_getgrgid.c
index e6b877687..8c530964c 100644
--- a/libbb/my_getgrgid.c
+++ b/libbb/my_getgrgid.c
@@ -19,8 +19,23 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+  /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
+  * flexible :
+  *
+  * if bufsize is > 0 char *group cannot be set to NULL
+  *                   on success groupname is written on static allocated buffer
+  *                   on failure gid as string is written to buffer and NULL is returned
+  * if bufsize is = 0 char *group can be set to NULL
+  *                   on success groupname is returned 
+  *                   on failure NULL is returned
+  * if bufsize is < 0 char *group can be set to NULL
+  *                   on success groupname is returned
+  *                   on failure an error message is printed and the program exits   
+  */
+  
 #include <stdio.h>
 #include <string.h>
+#include <assert.h>
 #include "libbb.h"
 #include "pwd_.h"
 #include "grp_.h"
@@ -33,10 +48,21 @@ char * my_getgrgid(char *group, long gid, int bufsize)
 
 	mygroup  = getgrgid(gid);
 	if (mygroup==NULL) {
-		snprintf(group, bufsize, "%ld", gid);
+		if(bufsize > 0) {
+			assert(group != NULL);
+			snprintf(group, bufsize, "%ld", (long)gid);
+		}
+		if( bufsize < 0 ) {
+			bb_error_msg_and_die("unknown gid %ld", (long)gid);
+		} 
 		return NULL;
 	} else {
-		return safe_strncpy(group, mygroup->gr_name, bufsize);
+		if(bufsize > 0)
+		{
+			assert(group != NULL);
+			return safe_strncpy(group, mygroup->gr_name, bufsize);
+		}
+		return mygroup->gr_name;
 	}
 }
 
diff --git a/libbb/my_getpwuid.c b/libbb/my_getpwuid.c
index 53f6c77ee..1e8b11a09 100644
--- a/libbb/my_getpwuid.c
+++ b/libbb/my_getpwuid.c
@@ -19,8 +19,23 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+ /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
+  * flexible :
+  *
+  * if bufsize is > 0 char *user can not be set to NULL
+  *                   on success username is written on static allocated buffer
+  *                   on failure uid as string is written to buffer and NULL is returned
+  * if bufsize is = 0 char *user can be set to NULL
+  *                   on success username is returned 
+  *                   on failure NULL is returned
+  * if bufsize is < 0 char *user can be set to NULL
+  *                   on success username is returned
+  *                   on failure an error message is printed and the program exits   
+  */
+  
 #include <stdio.h>
 #include <string.h>
+#include <assert.h>
 #include "libbb.h"
 #include "pwd_.h"
 #include "grp_.h"
@@ -34,10 +49,21 @@ char * my_getpwuid(char *name, long uid, int bufsize)
 
 	myuser  = getpwuid(uid);
 	if (myuser==NULL) {
-		snprintf(name, bufsize, "%ld", (long)uid);
+		if(bufsize > 0) {
+			assert(name != NULL);
+			snprintf(name, bufsize, "%ld", (long)uid);
+		}
+		if (bufsize < 0 ) {
+			bb_error_msg_and_die("unknown uid %ld", (long)uid); 
+		}
 		return NULL;
 	} else {
-		return safe_strncpy(name, myuser->pw_name, bufsize);
+		if(bufsize > 0 )
+		{
+			assert(name != NULL);
+			return safe_strncpy(name, myuser->pw_name, bufsize);
+		}
+		return myuser->pw_name;
 	}
 }
 
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index d0b2afc19..400ddb9a5 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -145,7 +145,6 @@ extern int passwd_main(int argc, char **argv)
 	int uflg = 0;				/* -u - unlock account */
 	int dflg = 0;				/* -d - delete password */
 	const struct passwd *pw;
-	unsigned short ruid;
 
 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
 	const struct spwd *sp;
@@ -170,12 +169,8 @@ extern int passwd_main(int argc, char **argv)
 			bb_show_usage();
 		}
 	}
-	ruid = getuid();
-	pw = (struct passwd *) getpwuid(ruid);
-	if (!pw) {
-               bb_error_msg_and_die("Cannot determine your user name.");
-	}
-	myname = (char *) bb_xstrdup(pw->pw_name);
+	myname = (char *) bb_xstrdup(my_getpwuid(NULL, getuid(), -1));
+	/* exits on error */
 	if (optind < argc) {
 		name = argv[optind];
 	} else {