[src/trunk]: src/usr.bin/make make(1): clean up Dir_AddDir

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4f07ad15e494
branches:  trunk
changeset: 937847:4f07ad15e494
user:      rillig <rillig%NetBSD.org@localhost>
date:      Fri Aug 28 04:59:17 2020 +0000

description:
make(1): clean up Dir_AddDir

Extract the null check for path to the top level.  This has the
side-effect of only incrementing dotLast.refCount if that entry is
actually used.

Reduce the indentation of the code by returning early from the simple
branches.

diffstat:

 usr.bin/make/dir.c |  73 +++++++++++++++++++++++++----------------------------
 1 files changed, 35 insertions(+), 38 deletions(-)

diffs (116 lines):

diff -r 3f575497db93 -r 4f07ad15e494 usr.bin/make/dir.c
--- a/usr.bin/make/dir.c        Fri Aug 28 04:48:56 2020 +0000
+++ b/usr.bin/make/dir.c        Fri Aug 28 04:59:17 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dir.c,v 1.119 2020/08/28 04:48:57 rillig Exp $ */
+/*     $NetBSD: dir.c,v 1.120 2020/08/28 04:59:17 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
@@ -70,14 +70,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: dir.c,v 1.119 2020/08/28 04:48:57 rillig Exp $";
+static char rcsid[] = "$NetBSD: dir.c,v 1.120 2020/08/28 04:59:17 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)dir.c      8.2 (Berkeley) 1/2/94";
 #else
-__RCSID("$NetBSD: dir.c,v 1.119 2020/08/28 04:48:57 rillig Exp $");
+__RCSID("$NetBSD: dir.c,v 1.120 2020/08/28 04:59:17 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -1564,57 +1564,54 @@
     DIR *d;                    /* for reading directory */
     struct dirent *dp;         /* entry in directory */
 
-    if (strcmp(name, ".DOTLAST") == 0) {
-       ln = path != NULL ? Lst_Find(path, DirFindName, name) : NULL;
+    if (path != NULL && strcmp(name, ".DOTLAST") == 0) {
+       ln = Lst_Find(path, DirFindName, name);
        if (ln != NULL)
            return Lst_Datum(ln);
-       else {
-           /* XXX: It is wrong to increment the refCount if dotLast is not
-            * used afterwards. */
-           dotLast->refCount += 1;
-           if (path != NULL)
-               Lst_Prepend(path, dotLast);
-       }
+
+       dotLast->refCount++;
+       Lst_Prepend(path, dotLast);
     }
 
-    if (path)
+    if (path != NULL)
        ln = Lst_Find(openDirectories, DirFindName, name);
     if (ln != NULL) {
        p = Lst_Datum(ln);
-       if (path && Lst_Member(path, p) == NULL) {
+       if (Lst_Member(path, p) == NULL) {
            p->refCount += 1;
            Lst_Append(path, p);
        }
-    } else {
-       DIR_DEBUG1("Caching %s ...", name);
+       return p;
+    }
+
+    DIR_DEBUG1("Caching %s ...", name);
 
-       if ((d = opendir(name)) != NULL) {
-           p = bmake_malloc(sizeof(Path));
-           p->name = bmake_strdup(name);
-           p->hits = 0;
-           p->refCount = 1;
-           Hash_InitTable(&p->files, -1);
+    if ((d = opendir(name)) != NULL) {
+       p = bmake_malloc(sizeof(Path));
+       p->name = bmake_strdup(name);
+       p->hits = 0;
+       p->refCount = 1;
+       Hash_InitTable(&p->files, -1);
 
-           while ((dp = readdir(d)) != NULL) {
+       while ((dp = readdir(d)) != NULL) {
 #if defined(sun) && defined(d_ino) /* d_ino is a sunos4 #define for d_fileno */
-               /*
-                * The sun directory library doesn't check for a 0 inode
-                * (0-inode slots just take up space), so we have to do
-                * it ourselves.
-                */
-               if (dp->d_fileno == 0) {
-                   continue;
-               }
+           /*
+            * The sun directory library doesn't check for a 0 inode
+            * (0-inode slots just take up space), so we have to do
+            * it ourselves.
+            */
+           if (dp->d_fileno == 0) {
+               continue;
+           }
 #endif /* sun && d_ino */
-               (void)Hash_CreateEntry(&p->files, dp->d_name, NULL);
-           }
-           (void)closedir(d);
-           Lst_Append(openDirectories, p);
-           if (path != NULL)
-               Lst_Append(path, p);
+           (void)Hash_CreateEntry(&p->files, dp->d_name, NULL);
        }
-       DIR_DEBUG0("done\n");
+       (void)closedir(d);
+       Lst_Append(openDirectories, p);
+       if (path != NULL)
+           Lst_Append(path, p);
     }
+    DIR_DEBUG0("done\n");
     return p;
 }