/*
- * Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
+ * Copyright (C) 2013-2014 Jo-Philipp Wich <jo@mein.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
#include <stdio.h>
#include <stdbool.h>
+#include <stdint.h>
#include <unistd.h>
#include <errno.h>
struct list_head list;
};
+static void
+print_usage(char *app)
+{
+ printf(
+ "== Usage ==\n\n"
+ " # %s [-a] [-i <file> | -s \"json...\"] {-t <pattern> | -e <pattern>}\n"
+ " -q Quiet, no errors are printed\n"
+ " -h, --help Print this help\n"
+ " -a Implicitely treat input as array, useful for JSON logs\n"
+ " -i path Specify a JSON file to parse\n"
+ " -s \"json\" Specify a JSON string to parse\n"
+ " -l limit Specify max number of results to show\n"
+ " -F separator Specify a field separator when using export\n"
+ " -t <pattern> Print the type of values matched by pattern\n"
+ " -e <pattern> Print the values matched by pattern\n"
+ " -e VAR=<pat> Serialize matched value for shell \"eval\"\n\n"
+ "== Patterns ==\n\n"
+ " Patterns are JsonPath: http://goessner.net/articles/JsonPath/\n"
+ " This tool implements $, @, [], * and the union operator ','\n"
+ " plus the usual expressions and literals.\n"
+ " It does not support the recursive child search operator '..' or\n"
+ " the '?()' and '()' filter expressions as those would require a\n"
+ " complete JavaScript engine to support them.\n\n"
+ "== Examples ==\n\n"
+ " Display the first IPv4 address on lan:\n"
+ " # ifstatus lan | %s -e '@[\"ipv4-address\"][0].address'\n\n"
+ " Extract the release string from the board information:\n"
+ " # ubus call system board | %s -e '@.release.description'\n\n"
+ " Find all interfaces which are up:\n"
+ " # ubus call network.interface dump | \\\n"
+ " %s -e '@.interface[@.up=true].interface'\n\n"
+ " Export br-lan traffic counters for shell eval:\n"
+ " # devstatus br-lan | %s -e 'RX=@.statistics.rx_bytes' \\\n"
+ " -e 'TX=@.statistics.tx_bytes'\n",
+ app, app, app, app, app);
+}
+
static struct json_object *
-parse_json(FILE *fd, const char *source, const char **error)
+parse_json_chunk(struct json_tokener *tok, struct json_object *array,
+ const char *buf, size_t len, enum json_tokener_error *err)
{
- int len;
- char buf[256];
struct json_object *obj = NULL;
+
+ while (len)
+ {
+ obj = json_tokener_parse_ex(tok, buf, len);
+ *err = json_tokener_get_error(tok);
+
+ if (*err == json_tokener_success)
+ {
+ if (array)
+ {
+ json_object_array_add(array, obj);
+ }
+ else
+ {
+ break;
+ }
+ }
+ else if (*err != json_tokener_continue)
+ {
+ break;
+ }
+
+ buf += tok->char_offset;
+ len -= tok->char_offset;
+ }
+
+ return obj;
+}
+
+static struct json_object *
+parse_json(FILE *fd, const char *source, const char **error, bool array_mode)
+{
+ size_t len;
+ char buf[256];
+ struct json_object *obj = NULL, *array = NULL;
struct json_tokener *tok = json_tokener_new();
enum json_tokener_error err = json_tokener_continue;
if (!tok)
+ {
+ *error = "Out of memory";
return NULL;
+ }
+
+ if (array_mode)
+ {
+ array = json_object_new_array();
+
+ if (!array)
+ {
+ json_tokener_free(tok);
+ *error = "Out of memory";
+ return NULL;
+ }
+ }
if (source)
{
- obj = json_tokener_parse_ex(tok, source, strlen(source));
- err = json_tokener_get_error(tok);
+ obj = parse_json_chunk(tok, array, source, strlen(source), &err);
}
else
{
while ((len = fread(buf, 1, sizeof(buf), fd)) > 0)
{
- obj = json_tokener_parse_ex(tok, buf, len);
- err = json_tokener_get_error(tok);
+ obj = parse_json_chunk(tok, array, buf, len, &err);
+
+ if (err == json_tokener_success && !array)
+ break;
- if (!err || err != json_tokener_continue)
+ if (err != json_tokener_continue)
break;
}
}
return NULL;
}
- return obj;
+ return array ? array : obj;
}
static void
case json_type_int:
print_separator(sep, &sc, sl);
- printf("%d", json_object_get_int(item->jsobj));
+ printf("%" PRId64, json_object_get_int64(item->jsobj));
break;
case json_type_double:
int main(int argc, char **argv)
{
+ bool array_mode = false;
int opt, rv = 0, limit = 0x7FFFFFFF;
FILE *input = stdin;
struct json_object *jsobj = NULL;
const char *jserr = NULL, *source = NULL, *separator = " ";
- while ((opt = getopt(argc, argv, "i:s:e:t:F:l:q")) != -1)
+ if (argc == 1)
+ {
+ print_usage(argv[0]);
+ goto out;
+ }
+
+ while ((opt = getopt(argc, argv, "ahi:s:e:t:F:l:q")) != -1)
{
switch (opt)
{
+ case 'a':
+ array_mode = true;
+ break;
+
+ case 'h':
+ print_usage(argv[0]);
+ goto out;
+
case 'i':
input = fopen(optarg, "r");
case 'e':
if (!jsobj)
{
- jsobj = parse_json(input, source, &jserr);
+ jsobj = parse_json(input, source, &jserr, array_mode);
if (!jsobj)
{
projects / oweals / jsonpath.git / blobdiff