json_script-ex

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記錄libubox example code

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item note
20160907 第一版

目錄

libubox

json_script_ctx

  • json_script_ctx

    [struct]

  • json_script_run
    json當成command來執行
    會呼叫handle_file及handle_command來做相對的處理

    [struct]

  • json_script_run
    json_script_run
    json_script_get_file
    json_script_run_file

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    void json_script_run(struct json_script_ctx *ctx, const char *name,struct blob_attr *vars)
    static struct json_script_file *json_script_get_file(struct json_script_ctx *ctx, const char *filename)
    void json_script_run_file(struct json_script_ctx *ctx, struct json_script_file *file,struct blob_attr *vars)

example

  • json_script-ex.c
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    $ cat json_script-ex.c
    #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;
            int rem;

            fprintf(stderr, "Command: %s", name);
            fprintf(stderr,"##");
            blobmsg_for_each_attr(cur, data, rem)
                    fprintf(stderr, " %s", (char *) blobmsg_data(cur));
            fprintf(stderr, "\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);

            printf("test11\n");
            json_script_run(&jctx, file, b_vars.head);

            json_script_free(&jctx);
            blob_buf_free(&b_script);
            blob_buf_free(&b_vars);

            return 0;
    }

使用json來執行command
不過還是看懂如何使用

example code