1 files changed, 139 insertions, 0 deletions
diff --git a/src/scheme/ao_scheme_error.c b/src/scheme/ao_scheme_error.c
new file mode 100644
index 00000000..d580a2c0
--- /dev/null
+++ b/src/scheme/ao_scheme_error.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "ao_scheme.h"
+#include <stdarg.h>
+
+void
+ao_scheme_error_poly(char *name, ao_poly poly, ao_poly last)
+{
+	int first = 1;
+	printf("\t\t%s(", name);
+	if (ao_scheme_poly_type(poly) == AO_SCHEME_CONS) {
+		if (poly) {
+			while (poly) {
+				struct ao_scheme_cons *cons = ao_scheme_poly_cons(poly);
+				if (!first)
+					printf("\t\t         ");
+				else
+					first = 0;
+				ao_scheme_poly_write(cons->car);
+				printf("\n");
+				if (poly == last)
+					break;
+				poly = cons->cdr;
+			}
+			printf("\t\t         )\n");
+		} else
+			printf(")\n");
+	} else {
+		ao_scheme_poly_write(poly);
+		printf("\n");
+	}
+}
+
+static void tabs(int indent)
+{
+	while (indent--)
+		printf("\t");
+}
+
+void
+ao_scheme_error_frame(int indent, char *name, struct ao_scheme_frame *frame)
+{
+	int			f;
+
+	tabs(indent);
+	printf ("%s{", name);
+	if (frame) {
+		struct ao_scheme_frame_vals	*vals = ao_scheme_poly_frame_vals(frame->vals);
+		if (frame->type & AO_SCHEME_FRAME_PRINT)
+			printf("recurse...");
+		else {
+			frame->type |= AO_SCHEME_FRAME_PRINT;
+			for (f = 0; f < frame->num; f++) {
+				if (f != 0) {
+					tabs(indent);
+					printf("         ");
+				}
+				ao_scheme_poly_write(vals->vals[f].atom);
+				printf(" = ");
+				ao_scheme_poly_write(vals->vals[f].val);
+				printf("\n");
+			}
+			if (frame->prev)
+				ao_scheme_error_frame(indent + 1, "prev:   ", ao_scheme_poly_frame(frame->prev));
+			frame->type &= ~AO_SCHEME_FRAME_PRINT;
+		}
+		tabs(indent);
+		printf("        }\n");
+	} else
+		printf ("}\n");
+}
+
+void
+ao_scheme_vprintf(char *format, va_list args)
+{
+	char c;
+
+	while ((c = *format++) != '\0') {
+		if (c == '%') {
+			switch (c = *format++) {
+			case 'v':
+				ao_scheme_poly_write((ao_poly) va_arg(args, unsigned int));
+				break;
+			case 'p':
+				printf("%p", va_arg(args, void *));
+				break;
+			case 'd':
+				printf("%d", va_arg(args, int));
+				break;
+			case 's':
+				printf("%s", va_arg(args, char *));
+				break;
+			default:
+				putchar(c);
+				break;
+			}
+		} else
+			putchar(c);
+	}
+}
+
+void
+ao_scheme_printf(char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+	ao_scheme_vprintf(format, args);
+	va_end(args);
+}
+
+ao_poly
+ao_scheme_error(int error, char *format, ...)
+{
+	va_list	args;
+
+	ao_scheme_exception |= error;
+	va_start(args, format);
+	ao_scheme_vprintf(format, args);
+	putchar('\n');
+	va_end(args);
+	ao_scheme_printf("Value:  %v\n", ao_scheme_v);
+	ao_scheme_printf("Frame:  %v\n", ao_scheme_frame_poly(ao_scheme_frame_current));
+	printf("Stack:\n");
+	ao_scheme_stack_write(ao_scheme_stack_poly(ao_scheme_stack));
+	ao_scheme_printf("Globals: %v\n", ao_scheme_frame_poly(ao_scheme_frame_global));
+	return AO_SCHEME_NIL;
+}