1 files changed, 104 insertions, 0 deletions
diff --git a/unix/os/zfsubd.c b/unix/os/zfsubd.c
new file mode 100644
index 00000000..fd9798be
--- /dev/null
+++ b/unix/os/zfsubd.c
@@ -0,0 +1,104 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#define import_spp
+#define	import_kernel
+#define import_knames
+#include <iraf.h>
+
+/* ZFSUBD -- Fold a subdirectory into an OS directory.  If osdir is null the
+ * current directory is assumed.  If subdir is null osdir is modified as
+ * necessary to make it a legal directory prefix, e.g., if osdir = "/usr/iraf"
+ * and subdir = "", we would return osdir = "/usr/iraf/".  The subdirectory
+ * "." refers to the current directory and ".." to the previous directory,
+ * but this is consistent with UNIX so we need not recognize these as special
+ * cases.  The return OS directory prefix need not be an absolute pathname.
+ */
+int
+ZFSUBD (
+  XCHAR	 *osdir,		/* pathname		[NOT PACKED]	*/
+  XINT	 *maxch,		/* max xchars in osdir			*/
+  XCHAR	 *subdir,		/* subdirectory name	[NOT PACKED]	*/
+  XINT	 *nchars		/* receives lenght of osdir		*/
+)
+{
+	register XCHAR	*ip, *op;
+	register int	n;
+	PKCHAR	cwd[SZ_PATHNAME+1];
+	XINT	x_maxch = SZ_PATHNAME;
+	XCHAR	*slash;
+	char	*cp;
+
+	extern  int ZFGCWD();
+
+
+	/* If osdir is null, use the current directory.
+	 */
+	if (osdir[0] == XEOS) {
+	    ZFGCWD (cwd, &x_maxch, nchars);
+	    if (*nchars == XERR)
+		return (XERR);
+	    n = *maxch;
+	    for (cp=(char *)cwd, op=osdir;  --n >= 0 && (*op = *cp++);  op++)
+		;
+	    *op = XEOS;
+	}
+
+	/* Find the end of the OSDIR string and the index of the / preceeding
+	 * the last directory name, e.g., if "a/b/", slash=2.
+	 */
+	slash = NULL;
+	for (op=osdir;  *op != XEOS;  op++)
+	    if (*op == '/' && *(op+1) != XEOS)
+		slash = op;
+
+	/* Make sure the OSDIR ends with a '/'.
+	 */
+	if (op > osdir && *(op-1) != '/')
+	    *op++ = '/';
+
+	n = *maxch - (op - osdir);
+
+	/* Concatenate the subdirectory. The "subdirectories "." or ".." are
+	 * special cases.
+	 */
+	for (ip=subdir;  *ip == ' ';  ip++)
+	    ;
+
+	if (*ip == '.') {
+	    switch (*(ip+1)) {
+	    case '.':
+		if (*(ip+2) == XEOS && slash != NULL && *(slash+1) != '.') {
+		    op = slash + 1;
+		    n = *maxch - (op - osdir);
+		} else
+		    goto subdir_;
+		break;
+	    case EOS:
+		break;
+	    default:
+		goto subdir_;
+	    }
+	} else {
+subdir_:    while (--n >= 0 && (*op = *ip++) != XEOS)
+		op++;
+	}
+
+	/* If OSDIR is the null string return the pathname of the current
+	 * working directory, i.e., "./".
+	 */
+	if (op == osdir && --n >= 0)
+	    *op++ = '.';
+
+	/* Make sure the OSDIR ends with a '/'
+	 */
+	if (*(op-1) != '/' && --n >= 0)
+	    *op++ = '/';
+
+	*op = XEOS;
+	*nchars = op - osdir;
+
+	return (XOK);
+}