[Git][cmucl/cmucl][master] 2 commits: Fix #130: Implement file_author in C

[Raymond Toy (@rtoy)]

Raymond Toy pushed to branch master at cmucl / cmucl


Commits:
4a7207b6 by Raymond Toy at 2022-10-17T18:58:45+00:00
Fix #130:  Implement file_author in C

- - - - -
ba5c5d2a by Raymond Toy at 2022-10-17T18:58:45+00:00
Merge branch 'issue-130-file-author-in-c' into 'master'

Fix #130:  Implement file_author in C

Closes #130

See merge request cmucl/cmucl!88
- - - - -


4 changed files:

- src/code/filesys.lisp
- src/lisp/os-common.c
- tests/issues.lisp
- + tests/안녕하십니까.txt


Changes:

=====================================
src/code/filesys.lisp
=====================================
@@ -1079,13 +1079,21 @@ optionally keeping some of the most recent old versions."
 		 :pathname file
 		 :format-control (intl:gettext "~S doesn't exist.")
 		 :format-arguments (list file)))
-	(multiple-value-bind (winp dev ino mode nlink uid)
-			     (unix:unix-stat name)
-	  (declare (ignore dev ino mode nlink))
-	  (when winp
-            (let ((user-info (unix:unix-getpwuid uid)))
-              (when user-info
-                (unix:user-info-name user-info))))))))
+	;; unix-namestring converts "." to "".  Convert it back to
+	;; "." so we can stat the current directory.  (Perhaps
+	;; that's a bug in unix-namestring?)
+	(when (zerop (length name))
+	  (setf name "."))
+	(let (author)
+	  (unwind-protect
+	       (progn
+		 (setf author (alien:alien-funcall
+			       (alien:extern-alien "os_file_author"
+						   (function (alien:* c-call:c-string) c-call:c-string))
+			       (unix::%name->file name)))
+		 (unless (alien:null-alien author)
+		   (alien:cast author c-call:c-string)))
+	    (alien:free-alien author))))))
 
 
 ;;;; DIRECTORY.


=====================================
src/lisp/os-common.c
=====================================
@@ -5,12 +5,16 @@
 
 */
 
+#include <assert.h>
 #include <errno.h>
 #include <math.h>
 #include <netdb.h>
+#include <pwd.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
+#include <unistd.h>
 #include <time.h>
 
 #include "os.h"
@@ -715,3 +719,57 @@ os_lstat(const char* path, u_int64_t *dev, u_int64_t *ino, unsigned int *mode, u
 
     return rc;
 }
+
+/*
+ * Interface for file-author.  Given a pathname, returns a new string
+ * holding the author of the file or NULL if some error occurred.  The
+ * caller is responsible for freeing the memory used by the string.
+ */
+char *
+os_file_author(const char *path)
+{
+    struct stat sb;
+    char initial[1024];
+    char *buffer, *obuffer;
+    size_t size;
+    struct passwd pwd;
+    struct passwd *ppwd;
+    char *result;
+
+    if (stat(path, &sb) != 0) {
+        return NULL;
+    }
+
+    result = NULL;
+    buffer = initial;
+    obuffer = NULL;
+    size = sizeof(initial) / sizeof(initial[0]);
+
+    /*
+     * Keep trying with larger buffers until a maximum is reached.  We
+     * assume (1 << 20) is large enough for any OS.
+     */
+    while (size <= (1 << 20)) {
+        switch (getpwuid_r(sb.st_uid, &pwd, buffer, size, &ppwd)) {
+          case 0:
+              /* Success, though we might not have a matching entry */
+              result = (ppwd == NULL) ? NULL : strdup(pwd.pw_name);
+              goto exit;
+          case ERANGE:
+              /* Buffer is too small, double its size and try again */
+              size *= 2;
+              obuffer = (buffer == initial) ? NULL : buffer;
+              if ((buffer = realloc(obuffer, size)) == NULL) {
+                  goto exit;
+              }
+              continue;
+          default:
+              /* All other errors */
+              goto exit;
+        }
+    }
+exit:
+    free(obuffer);
+    
+    return result;
+}


=====================================
tests/issues.lisp
=====================================
@@ -670,3 +670,10 @@
 		 (err (relerr value answer)))
 	    (assert-true (<= err eps) base err eps)))))))
 
+(define-test issue.130
+    (:tag :issues)
+  ;; Just verify that file-author works.  In particular "." should
+  ;; work and not return NIL.
+  (assert-true (file-author "."))
+  (assert-true (file-author "bin/build.sh"))
+  (assert-true (file-author "tests/안녕하십니까.txt")))


=====================================
tests/안녕하십니까.txt
=====================================
@@ -0,0 +1,3 @@
+The file name of this file is "안녕하십니까.txt" ("Hello" in Korean.)
+
+



View it on GitLab: https://gitlab.common-lisp.net/cmucl/cmucl/-/compare/95b4fc5c7629530925acfa8b8de3b6733b128853...ba5c5d2a6813c3c1504d9f884790f34b2e93d63f

-- 
View it on GitLab: https://gitlab.common-lisp.net/cmucl/cmucl/-/compare/95b4fc5c7629530925acfa8b8de3b6733b128853...ba5c5d2a6813c3c1504d9f884790f34b2e93d63f
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