json_script-example.c

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#include <stdio.h>
#include <stdlib.h>
 
#include <json.h>
#include "blobmsg.h"
#include "blobmsg_json.h"
#include "json_script.h"
 
struct json_script_ctx  jctx;
struct blob_buf         b_vars;
struct blob_buf         b_script;
 
static void handle_command(struct json_script_ctx *ctx, const char *name,
        struct blob_attr *data, struct blob_attr *vars)
{
        struct blob_attr *cur;
        size_t rem;
 
        fprintf(stdout, "%s", name);
        blobmsg_for_each_attr(cur, data, rem)
                fprintf(stdout, " %s", (char *) blobmsg_data(cur));
        fprintf(stdout, "\n");
}
 
static struct json_script_file *
handle_file(struct json_script_ctx *ctx, const char *filename)
{
        json_object *obj;
 
        obj = json_object_from_file(filename);
        if (!obj) {
                fprintf(stderr, "load JSON data from %s failed.\n", filename);
                return NULL;
        }
 
        blob_buf_init(&b_script, 0);
        blobmsg_add_json_element(&b_script, "", obj);
        json_object_put(obj);
 
        return json_script_file_from_blobmsg(filename,
                blob_data(b_script.head), blob_len(b_script.head));
}
 
static void usage(const char *prog, int exit_code)
{
        fprintf(stderr, "Usage: %s [VARNAME=value] <filename_json_script>\n", prog);
        exit(exit_code);
}
 
int main(int argc, char *argv[])
{
        int i;
        char *file = NULL;
        const char *prog = argv[0];
 
        blobmsg_buf_init(&b_vars);
        blobmsg_buf_init(&b_script);
 
        json_script_init(&jctx);
        jctx.handle_command = handle_command;
        jctx.handle_file = handle_file;
 
        for (i = 1; i < argc; i++) {
                char *sep = strchr(argv[i], '=');
                if (sep) {
                        *sep = '\0';
                        blobmsg_add_string(&b_vars, argv[i], sep + 1);
                } else if (!file) {
                        file = argv[i];
                } else {
                        usage(prog, -1);
                }
        }
        if (i < argc || !file)
                usage(prog, -2);
 
        json_script_run(&jctx, file, b_vars.head);
 
        json_script_free(&jctx);
        blob_buf_free(&b_script);
        blob_buf_free(&b_vars);
 
        return 0;
}