duktape-1.8.0/examples/jxpretty/jxpretty.c

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/*
 *  Pretty print JSON from stdin into indented JX.
 */
 
#include <stdio.h>
#include <stdlib.h>
#include "duktape.h"
 
static duk_ret_t do_jxpretty(duk_context *ctx) {
    FILE *f = stdin;
    char buf[4096];
    size_t ret;
 
    for (;;) {
        if (ferror(f)) {
            duk_error(ctx, DUK_ERR_ERROR, "ferror() on stdin");
        }
        if (feof(f)) {
            break;
        }
 
        ret = fread(buf, 1, sizeof(buf), f);
#if 0
        fprintf(stderr, "Read: %ld\n", (long) ret);
        fflush(stderr);
#endif
        if (ret == 0) {
            break;
        }
 
        duk_require_stack(ctx, 1);
        duk_push_lstring(ctx, (const char *) buf, ret);
    }
 
    duk_concat(ctx, duk_get_top(ctx));
 
    duk_eval_string(ctx, "(function (v) { print(Duktape.enc('jx', JSON.parse(v), null, 4)); })");
    duk_insert(ctx, -2);
    duk_call(ctx, 1);
 
    return 0;
}
 
int main(int argc, char *argv[]) {
    duk_context *ctx;
    duk_int_t rc;
 
    /* suppress warnings */
    (void) argc;
    (void) argv;
 
    ctx = duk_create_heap_default();
 
    rc = duk_safe_call(ctx, do_jxpretty, 0 /*nargs*/, 1 /*nrets*/);
    if (rc) {
        fprintf(stderr, "ERROR: %s\n", duk_safe_to_string(ctx, -1));
        fflush(stderr);
    }
 
    duk_destroy_heap(ctx);
 
    return 0;
}