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CC65 and file i/o



I'm toying around with cc65. I'm trying to write a string to a file and read it back again.
The following example works on a C64, yet x16emu cannot open the file for writing. Even with an sdcard attached.

Does anyone know whether this is unimplemented or a bug? The source in cc65/libsrc/common for fopen seems to be common among all "cbm" machines.

#include <stdlib.h>
#include <stdio.h>

char buf[128];

int main(void) {
    FILE *fp;
    int i;
    for (i = 0; i < 128; ++i) {
        buf = '\0';
    fp = fopen("testfile", "wb");
    if (fp == NULL) {
        printf("Could not open file for writing.");
        return 0;
    fputs("Hello World in text", fp);

    fp = fopen("testfile", "rb");
    if (fp == NULL) {
        printf("Could not open file for reading.");
        return 0;

    fgets(buf, 128, fp);

    printf("%s\n", buf);
    return 0;


Edited by Sandmage
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