[AD] al_find* in Unix

[Peter Wang <tjaden@xxxxxxxxxx>]

If you call `al_findfirst' without FA_RDONLY and run as root, files
owned by non-root won't be matched (which is strange because root can
write to everything).  This was reported by "Ceniza" on #allegro.
Patch attached.

Index: ufile.c
===================================================================
RCS file: /cvsroot/alleg/allegro/src/unix/ufile.c,v
retrieving revision 1.1
diff -u -r1.1 ufile.c
--- ufile.c	17 Dec 2001 11:14:48 -0000	1.1
+++ ufile.c	27 Mar 2002 06:09:04 -0000
@@ -264,17 +264,20 @@
 static int ff_get_attrib(AL_CONST char *name, struct stat *s)
 {
    int attrib = 0;
+   int euid = geteuid();
 
-   if (s->st_uid == geteuid()) {
-      if ((s->st_mode & S_IWUSR) == 0)
-         attrib |= FA_RDONLY;
-   }
-   else if (s->st_gid == getegid()) {
-      if ((s->st_mode & S_IWGRP) == 0)
-         attrib |= FA_RDONLY;
-   }
-   else if ((s->st_mode & S_IWOTH) == 0) {
-      attrib |= FA_RDONLY;
+   if (euid != 0) {
+      if (s->st_uid == euid) {
+	 if ((s->st_mode & S_IWUSR) == 0)
+	    attrib |= FA_RDONLY;
+      }
+      else if (s->st_gid == getegid()) {
+	 if ((s->st_mode & S_IWGRP) == 0)
+	    attrib |= FA_RDONLY;
+      }
+      else if ((s->st_mode & S_IWOTH) == 0) {
+	 attrib |= FA_RDONLY;
+      }
    }
 
    if (S_ISDIR(s->st_mode))