diff --git a/obj/mjson.o b/obj/mjson.o
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diff --git a/src/intf/mjson.h b/src/intf/mjson.h
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+++ b/src/intf/mjson.h
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+/* Structures for JSON parsing using only fixed-extent memory
+ *
+ * This file is Copyright (c) 2010 by the GPSD project
+ * SPDX-License-Identifier: BSD-2-clause
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <ctype.h>
+#ifdef TIME_ENABLE
+#include <time.h>
+#endif /* TIME_ENABLE */
+
+typedef enum {t_integer, t_uinteger, t_real,
+	      t_string, t_boolean, t_character,
+	      t_time,
+	      t_object, t_structobject, t_array,
+	      t_check, t_ignore,
+	      t_short, t_ushort}
+    json_type;
+
+struct json_enum_t {
+    char	*name;
+    int		value;
+};
+
+struct json_array_t {
+    json_type element_type;
+    union {
+	struct {
+	    const struct json_attr_t *subtype;
+	    char *base;
+	    size_t stride;
+	} objects;
+	struct {
+	    char **ptrs;
+	    char *store;
+	    int storelen;
+	} strings;
+	struct {
+	    int *store;
+	} integers;
+	struct {
+	    unsigned int *store;
+	} uintegers;
+	struct {
+	    short *store;
+	} shorts;
+	struct {
+	    unsigned short *store;
+	} ushorts;
+	struct {
+	    double *store;
+	} reals;
+	struct {
+	    bool *store;
+	} booleans;
+    } arr;
+    int *count, maxlen;
+};
+
+struct json_attr_t {
+    char *attribute;
+    json_type type;
+    union {
+	int *integer;
+	unsigned int *uinteger;
+	short *shortint;
+	unsigned short *ushortint;
+	double *real;
+	char *string;
+	bool *boolean;
+	char *character;
+	const struct json_attr_t *attrs;
+	const struct json_array_t array;
+	size_t offset;
+    } addr;
+    union {
+	int integer;
+	unsigned int uinteger;
+	short shortint;
+	unsigned short ushortint;
+	double real;
+	bool boolean;
+	char character;
+	char *check;
+    } dflt;
+    size_t len;
+    const struct json_enum_t *map;
+    bool nodefault;
+};
+
+#define JSON_ATTR_MAX	31	/* max chars in JSON attribute name */
+#define JSON_VAL_MAX	512	/* max chars in JSON value part */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+int json_read_object(const char *, const struct json_attr_t *,
+		     const char **);
+int json_read_array(const char *, const struct json_array_t *,
+		    const char **);
+const char *json_error_string(int);
+
+#ifdef TIME_ENABLE
+extern time_t timegm(struct tm *tm);
+#endif /* TIME_ENABLE */
+    
+void json_enable_debug(int, FILE *);
+#ifdef __cplusplus
+}
+#endif
+
+#define JSON_ERR_OBSTART	1	/* non-WS when expecting object start */
+#define JSON_ERR_ATTRSTART	2	/* non-WS when expecting attrib start */
+#define JSON_ERR_BADATTR	3	/* unknown attribute name */
+#define JSON_ERR_ATTRLEN	4	/* attribute name too long */
+#define JSON_ERR_NOARRAY	5	/* saw [ when not expecting array */
+#define JSON_ERR_NOBRAK 	6	/* array element specified, but no [ */
+#define JSON_ERR_STRLONG	7	/* string value too long */
+#define JSON_ERR_TOKLONG	8	/* token value too long */
+#define JSON_ERR_BADTRAIL	9	/* garbage while expecting comma or } or ] */
+#define JSON_ERR_ARRAYSTART	10	/* didn't find expected array start */
+#define JSON_ERR_OBJARR 	11	/* error while parsing object array */
+#define JSON_ERR_SUBTOOLONG	12	/* too many array elements */
+#define JSON_ERR_BADSUBTRAIL	13	/* garbage while expecting array comma */
+#define JSON_ERR_SUBTYPE	14	/* unsupported array element type */
+#define JSON_ERR_BADSTRING	15	/* error while string parsing */
+#define JSON_ERR_CHECKFAIL	16	/* check attribute not matched */
+#define JSON_ERR_NOPARSTR	17	/* can't support strings in parallel arrays */
+#define JSON_ERR_BADENUM	18	/* invalid enumerated value */
+#define JSON_ERR_QNONSTRING	19	/* saw quoted value when expecting nonstring */
+#define JSON_ERR_NONQSTRING	19	/* didn't see quoted value when expecting string */
+#define JSON_ERR_MISC		20	/* other data conversion error */
+#define JSON_ERR_BADNUM		21	/* error while parsing a numerical argument */
+#define JSON_ERR_NULLPTR	22	/* unexpected null value or attribute pointer */
+#define JSON_ERR_NOCURLY	23	/* object element specified, but no { */
+#define JSON_ERR_EMPTY		24	/* input was empty or white-space only */
+
+/*
+ * Use the following macros to declare template initializers for structobject
+ * arrays.  Writing the equivalents out by hand is error-prone.
+ *
+ * STRUCTOBJECT takes a structure name s, and a fieldname f in s.
+ *
+ * STRUCTARRAY takes the name of a structure array, a pointer to a an
+ * initializer defining the subobject type, and the address of an integer to
+ * store the length in.
+ */
+#define STRUCTOBJECT(s, f)	.addr.offset = offsetof(s, f)
+#define STRUCTARRAY(a, e, n) \
+	.addr.array.element_type = t_structobject, \
+	.addr.array.arr.objects.subtype = e, \
+	.addr.array.arr.objects.base = (char*)a, \
+	.addr.array.arr.objects.stride = sizeof(a[0]), \
+	.addr.array.count = n, \
+	.addr.array.maxlen = (int)(sizeof(a)/sizeof(a[0]))
+
+/* json.h ends here */