diff options
author | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2011-02-16 00:24:52 +0000 |
---|---|---|
committer | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2011-02-16 00:24:52 +0000 |
commit | 3b96f8e26b0fa34da206538181593dfdf16e4a54 (patch) | |
tree | 8833da94020531981dc723a4e28ea29f64f0df9d /package/jshn/src | |
parent | 200663f5d96c38484074fcb2849aae126dc6fb7f (diff) |
add jshn (JSON SHell Notation), a small utility and shell library for parsing and generating json data
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25547 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'package/jshn/src')
-rw-r--r-- | package/jshn/src/jshn.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/package/jshn/src/jshn.c b/package/jshn/src/jshn.c new file mode 100644 index 000000000..a2d711f38 --- /dev/null +++ b/package/jshn/src/jshn.c @@ -0,0 +1,245 @@ +#include <json/json.h> +#include <libubox/list.h> +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <stdbool.h> +#include <ctype.h> +#include <getopt.h> + +#define MAX_VARLEN 256 + +static int add_json_element(const char *key, json_object *obj); + +static int add_json_object(json_object *obj) +{ + int ret = 0; + + json_object_object_foreach(obj, key, val) { + ret = add_json_element(key, val); + if (ret) + break; + } + return ret; +} + +static int add_json_array(struct array_list *a) +{ + char seq[12]; + int i, len; + int ret; + + for (i = 0, len = array_list_length(a); i < len; i++) { + sprintf(seq, "%d", i); + ret = add_json_element(seq, array_list_get_idx(a, i)); + if (ret) + return ret; + } + + return 0; +} + +static void add_json_string(const char *str) +{ + char *ptr = (char *) str; + int len; + char *c; + + while ((c = strchr(ptr, '\'')) != NULL) { + len = c - ptr; + if (len > 0) + fwrite(ptr, len, 1, stdout); + ptr = c + 1; + c = "'\\''"; + fwrite(c, strlen(c), 1, stdout); + } + len = strlen(ptr); + if (len > 0) + fwrite(ptr, len, 1, stdout); +} + +static void write_key_string(const char *key) +{ + while (*key) { + putc(isalnum(*key) ? *key : '_', stdout); + key++; + } +} + +static int add_json_element(const char *key, json_object *obj) +{ + char *type; + + if (!obj) + return -1; + + switch (json_object_get_type(obj)) { + case json_type_object: + type = "object"; + break; + case json_type_array: + type = "array"; + break; + case json_type_string: + type = "string"; + break; + case json_type_boolean: + type = "boolean"; + break; + case json_type_int: + type = "int"; + break; + default: + return -1; + } + + fprintf(stdout, "json_add_%s '", type); + write_key_string(key); + + switch (json_object_get_type(obj)) { + case json_type_object: + fprintf(stdout, "';\n"); + add_json_object(obj); + fprintf(stdout, "json_close_object;\n"); + break; + case json_type_array: + fprintf(stdout, "';\n"); + add_json_array(json_object_get_array(obj)); + fprintf(stdout, "json_close_array;\n"); + break; + case json_type_string: + fprintf(stdout, "' '"); + add_json_string(json_object_get_string(obj)); + fprintf(stdout, "';\n"); + break; + case json_type_boolean: + fprintf(stdout, "' %d;\n", json_object_get_boolean(obj)); + break; + case json_type_int: + fprintf(stdout, "' %d;\n", json_object_get_int(obj)); + break; + default: + return -1; + } + + return 0; +} + +static int jshn_parse(const char *str) +{ + json_object *obj; + + obj = json_tokener_parse(str); + if (is_error(obj) || json_object_get_type(obj) != json_type_object) { + fprintf(stderr, "Failed to parse message data\n"); + return 1; + } + fprintf(stdout, "json_init;\n"); + add_json_object(obj); + fflush(stdout); + + return 0; +} + +static char *get_keys(const char *prefix) +{ + char *keys; + + keys = alloca(strlen(prefix) + sizeof("KEYS_") + 1); + sprintf(keys, "KEYS_%s", prefix); + return getenv(keys); +} + +static void get_var(const char *prefix, const char *name, char **var, char **type) +{ + char *tmpname; + + tmpname = alloca(strlen(prefix) + 1 + strlen(name) + 1 + sizeof("TYPE_")); + sprintf(tmpname, "TYPE_%s_%s", prefix, name); + *var = getenv(tmpname + 5); + *type = getenv(tmpname); +} + +static json_object *jshn_add_objects(json_object *obj, const char *prefix, bool array); + +static void jshn_add_object_var(json_object *obj, bool array, const char *prefix, const char *name) +{ + json_object *new; + char *var, *type; + + get_var(prefix, name, &var, &type); + if (!var || !type) + return; + + if (!strcmp(type, "array")) { + new = json_object_new_array(); + jshn_add_objects(new, var, true); + } else if (!strcmp(type, "object")) { + new = json_object_new_object(); + jshn_add_objects(new, var, false); + } else if (!strcmp(type, "string")) { + new = json_object_new_string(var); + } else if (!strcmp(type, "int")) { + new = json_object_new_int(atoi(var)); + } else if (!strcmp(type, "boolean")) { + new = json_object_new_boolean(!!atoi(var)); + } else { + return; + } + + if (array) + json_object_array_add(obj, new); + else + json_object_object_add(obj, name, new); +} + +static json_object *jshn_add_objects(json_object *obj, const char *prefix, bool array) +{ + char *keys, *key, *brk; + + keys = get_keys(prefix); + if (!keys || !obj) + goto out; + + for (key = strtok_r(keys, " ", &brk); key; + key = strtok_r(NULL, " ", &brk)) { + jshn_add_object_var(obj, array, prefix, key); + } + +out: + return obj; +} + +static int jshn_format(void) +{ + json_object *obj; + + obj = json_object_new_object(); + jshn_add_objects(obj, "JSON_VAR", false); + fprintf(stdout, "%s\n", json_object_to_json_string(obj)); + json_object_put(obj); + return 0; +} + +static int usage(const char *progname) +{ + fprintf(stderr, "Usage: %s -r <message>|-w\n", progname); + return 2; +} + +int main(int argc, char **argv) +{ + int ch; + + while ((ch = getopt(argc, argv, "r:w")) != -1) { + switch(ch) { + case 'r': + return jshn_parse(optarg); + case 'w': + return jshn_format(); + default: + return usage(argv[0]); + } + } + return usage(argv[0]); +} |