1 files changed, 108 insertions, 0 deletions
diff --git a/compat/opendir.c b/compat/opendir.c
new file mode 100644
index 0000000..b1a47ff
--- /dev/null
+++ b/compat/opendir.c
@@ -0,0 +1,108 @@
+/* 
+ * opendir.c --
+ *
+ *	This file provides dirent-style directory-reading procedures
+ *	for V7 Unix systems that don't have such procedures.  The
+ *	origin of this code is unclear, but it seems to have come
+ *	originally from Larry Wall.
+ *
+ *
+ * SCCS: @(#) opendir.c 1.3 96/02/15 12:08:21
+ */
+
+#include "tclInt.h"
+#include "tclPort.h"
+
+#undef DIRSIZ
+#define DIRSIZ(dp) \
+    ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
+
+/*
+ * open a directory.
+ */
+DIR *
+opendir(name)
+char *name;
+{
+	register DIR *dirp;
+	register int fd;
+	char *myname;
+
+	myname = ((*name == '\0') ? "." : name);
+	if ((fd = open(myname, 0, 0)) == -1)
+		return NULL;
+	if ((dirp = (DIR *)ckalloc(sizeof(DIR))) == NULL) {
+		close (fd);
+		return NULL;
+	}
+	dirp->dd_fd = fd;
+	dirp->dd_loc = 0;
+	return dirp;
+}
+
+/*
+ * read an old style directory entry and present it as a new one
+ */
+#ifndef pyr
+#define	ODIRSIZ	14
+
+struct	olddirect {
+	ino_t	od_ino;
+	char	od_name[ODIRSIZ];
+};
+#else	/* a Pyramid in the ATT universe */
+#define	ODIRSIZ	248
+
+struct	olddirect {
+	long	od_ino;
+	short	od_fill1, od_fill2;
+	char	od_name[ODIRSIZ];
+};
+#endif
+
+/*
+ * get next entry in a directory.
+ */
+struct dirent *
+readdir(dirp)
+register DIR *dirp;
+{
+	register struct olddirect *dp;
+	static struct dirent dir;
+
+	for (;;) {
+		if (dirp->dd_loc == 0) {
+			dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
+			    DIRBLKSIZ);
+			if (dirp->dd_size <= 0)
+				return NULL;
+		}
+		if (dirp->dd_loc >= dirp->dd_size) {
+			dirp->dd_loc = 0;
+			continue;
+		}
+		dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);
+		dirp->dd_loc += sizeof(struct olddirect);
+		if (dp->od_ino == 0)
+			continue;
+		dir.d_ino = dp->od_ino;
+		strncpy(dir.d_name, dp->od_name, ODIRSIZ);
+		dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */
+		dir.d_namlen = strlen(dir.d_name);
+		dir.d_reclen = DIRSIZ(&dir);
+		return (&dir);
+	}
+}
+
+/*
+ * close a directory.
+ */
+void
+closedir(dirp)
+register DIR *dirp;
+{
+	close(dirp->dd_fd);
+	dirp->dd_fd = -1;
+	dirp->dd_loc = 0;
+	ckfree((char *) dirp);
+}