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/* This demo is not needed to be C89-compatible, so for now GCC extensions are
* used */
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "jsmn.h"
#define NUM_TOKENS 20
static void json_dump_obj(jsontok_t *obj, const char *js) {
size_t len;
if (obj->end < 0 || obj->start < 0) {
return;
}
len = obj->end - obj->start;
printf("[%d,%d]\t", obj->start, obj->end);
char *type;
switch (obj->type) {
case JSON_OTHER:
type = "(?)";
break;
case JSON_NUMBER:
type = "(N)";
break;
case JSON_STRING:
type = "(S)";
break;
case JSON_ARRAY:
type = "(A)";
break;
case JSON_OBJECT:
type = "(O)";
break;
}
printf("%s ", type);
char *s = strndup((const char *) &js[obj->start], len);
printf("%s\n", s);
free(s);
}
int main(int argc, char *argv[]) {
int i;
jsontok_t tokens[NUM_TOKENS];
FILE *f;
int filesize = 0;
char *js = NULL;
if (argc != 2) {
fprintf(stderr, "Usage: ./demo <file.js>\n");
exit(EXIT_SUCCESS);
}
f = fopen(argv[1], "r");
if (f == NULL) {
fprintf(stderr, "Failed to open file `%s`\n", argv[1]);
exit(EXIT_FAILURE);
}
while (1) {
int r;
char buf[BUFSIZ];
r = fread(buf, 1, BUFSIZ, f);
if (r <= 0) {
break;
}
js = (char *) realloc(js, filesize + r);
if (js == NULL) {
fprintf(stderr, "Cannot allocate anough memory\n");
fclose(f);
exit(EXIT_FAILURE);
}
memcpy(js + filesize, buf, r);
filesize += r;
}
fclose(f);
jsmn_parse((unsigned char *) js, tokens, NUM_TOKENS, NULL);
for (i = 0; i<NUM_TOKENS; i++) {
json_dump_obj(&tokens[i], js);
}
free(js);
return 0;
}
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