#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include "../jsmn.h"
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/* Function realloc_it() is a wrapper function for standard realloc()
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* with one difference - it frees old memory pointer in case of realloc
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* failure. Thus, DO NOT use old data pointer in anyway after call to
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* realloc_it(). If your code has some kind of fallback algorithm if
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* memory can't be re-allocated - use standard realloc() instead.
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*/
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static inline void *realloc_it(void *ptrmem, size_t size) {
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void *p = realloc(ptrmem, size);
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if (!p) {
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free (ptrmem);
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fprintf(stderr, "realloc(): errno=%d\n", errno);
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}
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return p;
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}
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/*
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* An example of reading JSON from stdin and printing its content to stdout.
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* The output looks like YAML, but I'm not sure if it's really compatible.
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*/
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static int dump(const char *js, jsmntok_t *t, size_t count, int indent) {
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int i, j, k;
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if (count == 0) {
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return 0;
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}
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if (t->type == JSMN_PRIMITIVE) {
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printf("%.*s", t->end - t->start, js+t->start);
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return 1;
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} else if (t->type == JSMN_STRING) {
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printf("'%.*s'", t->end - t->start, js+t->start);
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return 1;
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} else if (t->type == JSMN_OBJECT) {
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printf("\n");
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j = 0;
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for (i = 0; i < t->size; i++) {
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for (k = 0; k < indent; k++) printf(" ");
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j += dump(js, t+1+j, count-j, indent+1);
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printf(": ");
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j += dump(js, t+1+j, count-j, indent+1);
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printf("\n");
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}
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return j+1;
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} else if (t->type == JSMN_ARRAY) {
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j = 0;
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printf("\n");
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for (i = 0; i < t->size; i++) {
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for (k = 0; k < indent-1; k++) printf(" ");
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printf(" - ");
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j += dump(js, t+1+j, count-j, indent+1);
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printf("\n");
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}
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return j+1;
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}
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return 0;
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}
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int main() {
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int r;
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int eof_expected = 0;
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char *js = NULL;
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size_t jslen = 0;
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char buf[BUFSIZ];
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jsmn_parser p;
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jsmntok_t *tok;
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size_t tokcount = 2;
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/* Prepare parser */
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jsmn_init(&p);
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/* Allocate some tokens as a start */
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tok = malloc(sizeof(*tok) * tokcount);
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if (tok == NULL) {
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fprintf(stderr, "malloc(): errno=%d\n", errno);
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return 3;
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}
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for (;;) {
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/* Read another chunk */
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r = fread(buf, 1, sizeof(buf), stdin);
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if (r < 0) {
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fprintf(stderr, "fread(): %d, errno=%d\n", r, errno);
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return 1;
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}
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if (r == 0) {
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if (eof_expected != 0) {
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return 0;
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} else {
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fprintf(stderr, "fread(): unexpected EOF\n");
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return 2;
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}
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}
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js = realloc_it(js, jslen + r + 1);
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if (js == NULL) {
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return 3;
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}
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strncpy(js + jslen, buf, r);
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jslen = jslen + r;
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again:
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r = jsmn_parse(&p, js, jslen, tok, tokcount);
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if (r < 0) {
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if (r == JSMN_ERROR_NOMEM) {
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tokcount = tokcount * 2;
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tok = realloc_it(tok, sizeof(*tok) * tokcount);
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if (tok == NULL) {
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return 3;
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}
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goto again;
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}
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} else {
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dump(js, tok, p.toknext, 0);
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eof_expected = 1;
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}
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}
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return EXIT_SUCCESS;
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}
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