Re: mkdir builtin and $'\0'

[Peter Stephenson <p.stephenson@xxxxxxxxxxx>]

On Fri, 21 Aug 2015 09:57:21 +0100
Peter Stephenson <p.stephenson@xxxxxxxxxxx> wrote:
> There are a couple of remaining lchdir() calls in glob.c.  I haven't
> determined whether the arguments are already unmetafied or not.

Evidence seems quite positive that pathbuf in glob.c (and pattern.c) is
supposed to be metafied.

(However, a couple of postdoctoral researchers at an institute in Outer
Mongolia have found new evidence that under some circumstances certain
components of the path may be slightly sensitive to unmetafication in
the infra-red...  I wish this were funny.)

Mikael might to try a bit of globbing with some of his usefully named
directories.

pws

diff --git a/Src/glob.c b/Src/glob.c
index 3af4690..dea1bf5 100644
--- a/Src/glob.c
+++ b/Src/glob.c
@@ -102,8 +102,14 @@ int badcshglob;
 /**/
 int pathpos;		/* position in pathbuf (needed by pattern code) */
 
+/*
+ * pathname buffer (needed by pattern code).
+ * It is currently believed the string in here is stored metafied and is
+ * unmetafied temporarily as needed by system calls.
+ */
+
 /**/
-char *pathbuf;		/* pathname buffer (needed by pattern code) */
+char *pathbuf;
 
 typedef struct stat *Statptr;	 /* This makes the Ultrix compiler happy.  Go figure. */
 
@@ -495,7 +501,7 @@ scanner(Complist q, int shortcircuit)
 
 	    if (l >= PATH_MAX)
 		return;
-	    err = lchdir(pathbuf + pathbufcwd, &ds, 0);
+	    err = lchdir(unmeta(pathbuf + pathbufcwd), &ds, 0);
 	    if (err == -1)
 		return;
 	    if (err) {
@@ -517,7 +523,7 @@ scanner(Complist q, int shortcircuit)
 		    else if (!strcmp(str, "..")) {
 			struct stat sc, sr;
 
-			add = (stat("/", &sr) || stat(pathbuf, &sc) ||
+			add = (stat("/", &sr) || stat(unmeta(pathbuf), &sc) ||
 			       sr.st_ino != sc.st_ino ||
 			       sr.st_dev != sc.st_dev);
 		    }
@@ -564,7 +570,7 @@ scanner(Complist q, int shortcircuit)
 
 		    DPUTS(pathpos == pathbufcwd,
 			  "BUG: filename longer than PATH_MAX");
-		    err = lchdir(pathbuf + pathbufcwd, &ds, 0);
+		    err = lchdir(unmeta(pathbuf + pathbufcwd), &ds, 0);
 		    if (err == -1)
 			break;
 		    if (err) {