file_io.tc

File I/O demo — write and read back

Source on GitHub

// File I/O demo — write and read back
// On ESP32: uses LittleFS, in browser: simulated virtual filesystem

int main() {
    char data[64];
    char buf[64];

    // Prepare data to write
    strcpy(data, "Hello from TinyC!\n");

    // Write to file (r=read, w=write, a=append)
    int f = fileOpen("/test.txt", w);
    if (f >= 0) {
        fileWrite(f, data, strlen(data));
        fileClose(f);
        printStr("Written OK\n");
    }

    // Read back
    f = fileOpen("/test.txt", r);
    if (f >= 0) {
        int n = fileRead(f, buf, 63);
        buf[n] = 0;  // null-terminate
        fileClose(f);
        printStr("Read back: ");
        printString(buf);
    }

    // Check file info
    if (fileExists("/test.txt")) {
        printStr("File size: ");
        print(fileSize("/test.txt"));
        printStr("\n");
    }

    // Clean up
    fileDelete("/test.txt");
    printStr("File deleted\n");

    return 0;
}