--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rvinterf/asyncshell/parse.c	Sat Jun 11 00:13:35 2016 +0000
@@ -0,0 +1,53 @@
+/*
+ * This module implements the parser helper function that allows
+ * the same code to be reused between interactive and one-shot
+ * versions of the same command.
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <strings.h>
+#include <stdlib.h>
+
+parse_interactive_command_into_argv(argstr, argv, min_arg, max_arg, argcp)
+	char *argstr, **argv;
+	int min_arg, max_arg, *argcp;
+{
+	char *cp, **ap;
+
+	cp = argstr;
+	for (ap = argv; ; ) {
+		while (isspace(*cp))
+			cp++;
+		if (!*cp || *cp == '#')
+			break;
+		if (ap - argv >= max_arg) {
+			printf("error: too many arguments\n");
+			return(-1);
+		}
+		if (*cp == '"') {
+			*ap++ = ++cp;
+			while (*cp && *cp != '"')
+				cp++;
+			if (*cp != '"') {
+				printf("error: unterminated quoted string\n");
+				return(-1);
+			}
+			*cp++ = '\0';
+		} else {
+			*ap++ = cp;
+			while (*cp && !isspace(*cp))
+				cp++;
+			if (*cp)
+				*cp++ = '\0';
+		}
+	}
+	if (ap - argv < min_arg) {
+		printf("error: too few arguments\n");
+		return(-1);
+	}
+	*ap = 0;
+	*argcp = ap - argv;
+	return(0);
+}