examples: add example code for json_script.

[project/libubox.git] / examples / json_script-example.c

diff --git a/examples/json_script-example.c b/examples/json_script-example.c
new file mode 100644 (file)
index 0000000..e3305de
--- /dev/null
+++ b/examples/json_script-example.c
@@ -0,0 +1,84 @@
+#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);
+       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);
+
+       json_script_run(&jctx, file, b_vars.head);
+
+       json_script_free(&jctx);
+       blob_buf_free(&b_script);
+       blob_buf_free(&b_vars);
+
+       return 0;
+}