1 files changed, 32 insertions, 0 deletions
diff --git a/sys/osb/chrupk.c b/sys/osb/chrupk.c
new file mode 100644
index 00000000..f909c8d9
--- /dev/null
+++ b/sys/osb/chrupk.c
@@ -0,0 +1,32 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+ */
+
+#define	import_spp
+#define import_knames
+#include <iraf.h>
+
+/* CHRUPK -- Unpack a byte string into XCHAR.  This routine does not
+ * know about EOS terminators.  The input and output arrays may be the same.
+ * Note that while XCHAR is signed, the signedness of the C char is unspecified,
+ * hence we pack the chars into unsigned bytes and restore the sign explicitly.
+ */
+CHRUPK (a, a_off, b, b_off, nchars)
+XCHAR	*a, *b;
+XINT	*a_off, *b_off, *nchars;
+{
+	register unsigned char *ip;
+	register XCHAR	*op;
+	register int	n, ch;
+
+	/* Set pointers to last char plus one so that we can unpack the array
+	 * in the reverse direction.
+	 */
+	n = *nchars;
+	ip = &((unsigned char *)a)[*a_off-1+n];
+	op = &b[*b_off-1+n];
+
+	/* Unpack string from right to left.
+	 */
+	while (--n >= 0)
+	    *--op = ((ch = *--ip) <= 127) ? ch : ch - 256;
+}