Enhance name_to_{u,g}id() to optionally parse numbers and rename

to {user,group}_to_*().  Based on a patch by Matt McCutchen.

clientserver.c

@@ -416,13 +416,10 @@ static int path_failure(int f_out, const char *dir, BOOL was_chdir)
 static int add_a_group(int f_out, const char *gname)
 {
 	gid_t gid;
-	if (!name_to_gid(gname, &gid)) {
-		if (!isDigit(gname)) {
-			rprintf(FLOG, "Invalid gid %s\n", gname);
-			io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
-			return -1;
-		}
-		gid = atol(gname);
+	if (!group_to_gid(gname, &gid, True)) {
+		rprintf(FLOG, "Invalid gid %s\n", gname);
+		io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
+		return -1;
 	}
 	if (gid_count == MAX_GID_LIST) {
 		rprintf(FLOG, "Too many groups specified via gid parameter.\n");
@@ -558,13 +555,10 @@ static int rsync_module(int f_in, int f_out, int i, const char *addr, const char
 
 	p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
 	if (p) {
-		if (!name_to_uid(p, &uid)) {
-			if (!isDigit(p)) {
-				rprintf(FLOG, "Invalid uid %s\n", p);
-				io_printf(f_out, "@ERROR: invalid uid %s\n", p);
-				return -1;
-			}
-			uid = atol(p);
+		if (!user_to_uid(p, &uid, True)) {
+			rprintf(FLOG, "Invalid uid %s\n", p);
+			io_printf(f_out, "@ERROR: invalid uid %s\n", p);
+			return -1;
 		}
 		set_uid = 1;
 	} else

uidlist.c

@@ -181,10 +181,10 @@ static struct idlist *recv_add_id(struct idlist **idlist_ptr, struct idlist *idm
 	else if (*name && id) {
 		if (idlist_ptr == &uidlist) {
 			uid_t uid;
-			id2 = name_to_uid(name, &uid) ? uid : id;
+			id2 = user_to_uid(name, &uid, False) ? uid : id;
 		} else {
 			gid_t gid;
-			id2 = name_to_gid(name, &gid) ? gid : id;
+			id2 = group_to_gid(name, &gid, False) ? gid : id;
 		}
 	} else
 		id2 = id;
@@ -415,7 +415,6 @@ void parse_name_map(char *map, BOOL usernames)
 			char *dash = strchr(cp, '-');
 			if (strspn(cp, "0123456789-") != (size_t)(colon - cp)
 			 || (dash && (!dash[1] || strchr(dash+1, '-')))) {
-			  bad_number:
 				rprintf(FERROR, "Invalid number in --%smap: %s\n",
 					usernames ? "user" : "group", cp);
 				exit_cleanup(RERR_SYNTAX);
@@ -436,15 +435,9 @@ void parse_name_map(char *map, BOOL usernames)
 			id1 = 0;
 		}
 
-		if (isDigit(colon+1)) {
-			if (strspn(colon+1, "0123456789") != (size_t)(end - colon - 1)) {
-				cp = colon+1;
-				goto bad_number;
-			}
-			add_to_list(idmap_ptr, id1, name, atol(colon+1), flags);
-		} else if (usernames) {
+		if (usernames) {
 			uid_t uid;
-			if (name_to_uid(colon+1, &uid))
+			if (user_to_uid(colon+1, &uid, True))
 				add_to_list(idmap_ptr, id1, name, uid, flags);
 			else {
 				rprintf(FERROR,
@@ -453,7 +446,7 @@ void parse_name_map(char *map, BOOL usernames)
 			}
 		} else {
 			gid_t gid;
-			if (name_to_gid(colon+1, &gid))
+			if (group_to_gid(colon+1, &gid, True))
 				add_to_list(idmap_ptr, id1, name, gid, flags);
 			else {
 				rprintf(FERROR,

util.c

@@ -534,24 +534,32 @@ void kill_all(int sig)
 	}
 }
 
-/** Turn a user name into a uid */
-int name_to_uid(const char *name, uid_t *uid_p)
+/* Parse a user name or (optionally) a number into a uid */
+int user_to_uid(const char *name, uid_t *uid_p, BOOL num_ok)
 {
 	struct passwd *pass;
 	if (!name || !*name)
 		return 0;
+	if (num_ok && name[strspn(name, "0123456789")] == '\0') {
+		*uid_p = atol(name);
+		return 1;
+	}
 	if (!(pass = getpwnam(name)))
 		return 0;
 	*uid_p = pass->pw_uid;
 	return 1;
 }
 
-/** Turn a group name into a gid */
-int name_to_gid(const char *name, gid_t *gid_p)
+/* Parse a group name or (optionally) a number into a gid */
+int group_to_gid(const char *name, gid_t *gid_p, BOOL num_ok)
 {
 	struct group *grp;
 	if (!name || !*name)
 		return 0;
+	if (num_ok && name[strspn(name, "0123456789")] == '\0') {
+		*gid_p = atol(name);
+		return 1;
+	}
 	if (!(grp = getgrnam(name)))
 		return 0;
 	*gid_p = grp->gr_gid;