1 files changed, 53 insertions, 0 deletions
diff --git a/sys/etc/envnext.x b/sys/etc/envnext.x
new file mode 100644
index 00000000..80ddf226
--- /dev/null
+++ b/sys/etc/envnext.x
@@ -0,0 +1,53 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"environ.h"
+
+# ENV_FIRST -- Return a pointer to the first (most recently entered) entry
+# in the environment list.  A pointer to the string definition of the entry
+# is returned as the output argument.
+
+pointer procedure env_first (valp)
+
+pointer	valp			# pointer to environment string
+pointer	el
+include	"environ.com"
+
+begin
+	el = envbuf + last
+	if (el > envbuf) {
+	    valp = E_SETP(el)
+	    return (el)
+	} else
+	    return (NULL)
+end
+
+
+# ENV_NEXT -- Return a pointer to the next element in the environment list.
+# A pointer to the string value of the element is returned as the output
+# argument.
+
+pointer procedure env_next (last_el, valp, show_redefines)
+
+pointer	last_el			# pointer to last element returned
+pointer	valp			# receives charp of next element define string
+int	show_redefines		# do not skip redefined elements
+
+pointer	el
+include	"environ.com"
+
+begin
+	el = envbuf + E_LASTELEM(last_el)
+
+	while (el > envbuf) {
+	    if (E_REDEF(el) == NO || show_redefines == YES)
+		break
+	    else
+		el = envbuf + E_LASTELEM(el)
+	}
+
+	if (el > envbuf) {
+	    valp = E_SETP(el)
+	    return (el)
+	} else
+	    return (NULL)
+end