Function cbm_copy_file

src/cli/cli.c:319–353

/* ── File utilities ───────────────────────────────────────────── */

int cbm_copy_file(const char *src, const char *dst) {
    FILE *in = fopen(src, "rb");
    if (!in) {
        return CLI_ERR;
    }

    FILE *out = fopen(dst, "wb");
    if (!out) {
        (void)fclose(in);
        return CLI_ERR;
    }

    char buf[CLI_BUF_8K];
    int err = 0;
    while (!feof(in) && !ferror(in)) {
        size_t n = fread(buf, CLI_ELEM_SIZE, sizeof(buf), in);
        if (n == 0) {
            break;
        }
        if (fwrite(buf, CLI_ELEM_SIZE, n, out) != n) {
            err = CLI_TRUE;
            break;
        }
    }

    if (err || ferror(in)) {
        (void)fclose(in);
        (void)fclose(out);
        return CLI_ERR;
    }

    (void)fclose(in);
    int rc = fclose(out);
    return rc == 0 ? 0 : CLI_ERR;
}

/* Return true if two paths refer to the same on-disk file. Used to avoid
 * copying the running binary onto itself during install (cbm_copy_file would