jstree

a super lightweight json library

Quality

parse json file

jsmn_parser p;
jsmntok_t *tok;

tokcount = 2;
tok = malloc(sizeof(*tok) * tokcount);

ret = 0;

do{
	ret = jsmn_parse(&p, filedata, filelen, tok, tokcount);
	if(ret == JSMN_ERROR_NOMEM){
		tokcount = tokcount * 2;
		tok = realloc_it(tok, sizeof(*tok) * tokcount);
		if(tok == NULL){
			return -1;
		}
		continue;
	}else if(ret < 0){
		printf("failed ret = %d\n", ret);
	}
	break;
}while(1);

convert jsmntok to jstree

#include "jstree.h"

typedef struct{
  int ret; //number of tokens
  _tree_node * node; // pointer to the root node
}jstreeret;

jstreeret js2tree(const char *js, jsmntok_t *t, size_t count);

int jstree_read(_tree_node * root, _tree_node * return, ...); // returns number of tokens matched

jstreeret result;

result = js2tree(filedata, tok, p.toknext);

if(jstree_read(result.node->r, &rnode, "serials") == 1){
  ...
}

create a jstree

_tree_node * root;

root = alloc_tree_node(JSMN_ARRAY);

jstree to json

int datalen;
char * tx_buf;

datalen = tree2json(root, 0, 0);

tx_buf = malloc(datalen);
tree2json(root, tx_buf, datalen);