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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 <unistd.h>
#include <getopt.h>
#include <errno.h>
#include "jsmn.h"
static void jsmn_dump_obj(jsontok_t *obj, const char *js) {
size_t len;
char *s;
if (obj->end < 0 || obj->start < 0) {
return;
}
len = obj->end - obj->start;
printf("[%3d,%3d] (%c)\t", obj->start, obj->end,
({
char c;
switch (obj->type) {
case JSON_PRIMITIVE: c = '.'; break;
case JSON_STRING: c = 's'; break;
case JSON_ARRAY: c = 'A'; break;
case JSON_OBJECT: c = 'O'; break;
default: c = '?';
}; c;
}));
s = strndup((const char *) &js[obj->start], len);
printf("%s\n", s);
free(s);
}
void usage(void) {
fprintf(stderr, "Usage: ./demo <file.js>\n");
exit(EXIT_SUCCESS);
}
int main(int argc, char *argv[]) {
int i;
int r;
int c;
FILE *f;
int filesize = 0;
jsmn_parser parser;
char *js = NULL;
jsontok_t *tokens;
int num_tokens = 100;
while ((c = getopt(argc, argv, "ht:")) != -1) {
switch (c) {
case 'h':
usage();
break;
case 't':
num_tokens = atoi(optarg);
if (errno || num_tokens < 0) {
fprintf(stderr, "Invalid token number: %s!\n", optarg);
exit(EXIT_FAILURE);
}
break;
}
}
if (optind >= argc) {
usage();
}
if (strcmp(argv[optind], "-") == 0) {
f = stdin;
} else {
f = fopen(argv[optind], "r");
if (f == NULL) {
fprintf(stderr, "Failed to open file `%s`\n", argv[1]);
exit(EXIT_FAILURE);
}
}
tokens = malloc(num_tokens * sizeof(jsontok_t));
if (tokens == NULL) {
fprintf(stderr, "Cannot allocate anough memory\n");
exit(EXIT_FAILURE);
}
jsmn_init_parser(&parser, js, tokens, num_tokens);
while (1) {
char buf[BUFSIZ];
r = fread(buf, 1, 1, f);
if (r <= 0) {
break;
}
js = (char *) realloc(js, filesize + r + 1);
if (js == NULL) {
fprintf(stderr, "Cannot allocate anough memory\n");
fclose(f);
exit(EXIT_FAILURE);
}
parser.js = js;
memcpy(js + filesize, buf, r);
filesize += r;
js[filesize] = '\0';
r = jsmn_parse(&parser);
if (r < 0) {
printf("error %d at pos %d: %s\n", r, parser.pos, &js[parser.pos]);
}
for (i = 0; i<num_tokens; i++) {
jsmn_dump_obj(&parser.tokens[i], js);
}
}
fclose(f);
free(tokens);
free(js);
return 0;
}
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