duktape-1.5.2/examples/eventloop/fileio.c

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/*
 *  File I/O binding example.
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "duktape.h"
 
static int fileio_readfile(duk_context *ctx) {
    const char *filename = duk_to_string(ctx, 0);
    FILE *f = NULL;
    long len;
    void *buf;
    size_t got;
 
    if (!filename) {
        goto error;
    }
 
    f = fopen(filename, "rb");
    if (!f) {
        goto error;
    }
 
    if (fseek(f, 0, SEEK_END) != 0) {
        goto error;
    }
 
    len = ftell(f);
 
    if (fseek(f, 0, SEEK_SET) != 0) {
        goto error;
    }
 
    buf = duk_push_fixed_buffer(ctx, (size_t) len);
 
    got = fread(buf, 1, len, f);
    if (got != (size_t) len) {
        goto error;
    }
 
    fclose(f);
    f = NULL;
 
    return 1;
 
 error:
    if (f) {
        fclose(f);
    }
 
    return DUK_RET_ERROR;
}
 
static duk_function_list_entry fileio_funcs[] = {
    { "readfile", fileio_readfile, 1 },
    { NULL, NULL, 0 }
};
 
void fileio_register(duk_context *ctx) {
    /* Set global 'FileIo'. */
    duk_push_global_object(ctx);
    duk_push_object(ctx);
    duk_put_function_list(ctx, -1, fileio_funcs);
    duk_put_prop_string(ctx, -2, "FileIo");
    duk_pop(ctx);
}