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102 lines
1.7 KiB
102 lines
1.7 KiB
/* This demo is not needed to be C89-compatible, so for now GCC extensions are
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* used */
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "jsmn.h"
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#define NUM_TOKENS 30
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static void jsmn_dump_obj(jsontok_t *obj, const char *js) {
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size_t len;
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if (obj->end < 0 || obj->start < 0) {
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return;
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}
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len = obj->end - obj->start;
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printf("[%d,%d]\t", obj->start, obj->end);
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char *type;
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switch (obj->type) {
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case JSON_OTHER:
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type = "(?)";
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break;
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case JSON_NUMBER:
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type = "(N)";
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break;
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case JSON_STRING:
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type = "(S)";
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break;
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case JSON_ARRAY:
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type = "(A)";
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break;
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case JSON_OBJECT:
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type = "(O)";
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break;
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}
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printf("%s ", type);
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char *s = strndup((const char *) &js[obj->start], len);
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printf("%s\n", s);
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free(s);
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}
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int main(int argc, char *argv[]) {
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int i;
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int r;
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int errpos;
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jsontok_t tokens[NUM_TOKENS];
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FILE *f;
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int filesize = 0;
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char *js = NULL;
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if (argc != 2) {
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fprintf(stderr, "Usage: ./demo <file.js>\n");
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exit(EXIT_SUCCESS);
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}
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f = fopen(argv[1], "r");
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if (f == NULL) {
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fprintf(stderr, "Failed to open file `%s`\n", argv[1]);
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exit(EXIT_FAILURE);
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}
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while (1) {
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char buf[BUFSIZ];
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r = fread(buf, 1, BUFSIZ, f);
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if (r <= 0) {
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break;
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}
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js = (char *) realloc(js, filesize + r);
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if (js == NULL) {
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fprintf(stderr, "Cannot allocate anough memory\n");
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fclose(f);
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exit(EXIT_FAILURE);
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}
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memcpy(js + filesize, buf, r);
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filesize += r;
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}
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fclose(f);
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r = jsmn_parse((unsigned char *) js, tokens, NUM_TOKENS, &errpos);
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if (r < 0) {
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printf("error %d at pos %d: %s\n", r, errpos, &js[errpos]);
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exit(EXIT_FAILURE);
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}
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for (i = 0; i<NUM_TOKENS; i++) {
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jsmn_dump_obj(&tokens[i], js);
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}
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free(js);
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return 0;
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}
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