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diff --git a/gs/src/gsargs.h b/gs/src/gsargs.h
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+/* Copyright (C) 1997 Aladdin Enterprises.  All rights reserved.
+  
+  This file is part of Aladdin Ghostscript.
+  
+  Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
+  or distributor accepts any responsibility for the consequences of using it,
+  or for whether it serves any particular purpose or works at all, unless he
+  or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
+  License (the "License") for full details.
+  
+  Every copy of Aladdin Ghostscript must include a copy of the License,
+  normally in a plain ASCII text file named PUBLIC.  The License grants you
+  the right to copy, modify and redistribute Aladdin Ghostscript, but only
+  under certain conditions described in the License.  Among other things, the
+  License requires that the copyright notice and this notice be preserved on
+  all copies.
+*/
+
+/* gsargs.h */
+/* Command line argument list management */
+
+#ifndef gsargs_INCLUDED
+#  define gsargs_INCLUDED
+
+/*
+ * We need to handle recursion into @-files.
+ * The following structures keep track of the state.
+ * Defining a maximum argument length and a maximum nesting depth
+ * decreases generality, but eliminates the need for dynamic allocation.
+ */
+#define arg_str_max 512
+#define arg_depth_max 10
+typedef struct arg_source_s {
+	bool is_file;
+	union _u {
+	  const char *str;
+	  FILE *file;
+	} u;
+} arg_source;
+typedef struct arg_list_s {
+	bool expand_ats;	/* if true, expand @-files */
+	FILE *(*arg_fopen)(P2(const char *fname, void *fopen_data));
+	void *fopen_data;
+	const char **argp;
+	int argn;
+	int depth;		/* depth of @-files */
+	char cstr[arg_str_max + 1];
+	arg_source sources[arg_depth_max];
+} arg_list;
+
+/* Initialize an arg list. */
+void arg_init(P5(arg_list *pal, const char **argv, int argc,
+		 FILE *(*arg_fopen)(P2(const char *fname, void *fopen_data)),
+		 void *fopen_data));
+
+/* Push a string onto an arg list. */
+/* This may also be used (once) to "unread" the last argument. */
+void arg_push_string(P2(arg_list *pal, const char *str));
+
+/* Clean up an arg list before exiting. */
+void arg_finit(P1(arg_list *pal));
+
+/* Get the next arg from a list. */
+/* Note that these are not copied to the heap. */
+const char *arg_next(P1(arg_list *pal));
+
+/* Copy an argument string to the heap. */
+char *arg_copy(P2(const char *str, gs_memory_t *mem));
+
+#endif					/* gsargs_INCLUDED */