Function opt_get_array

libavutil/opt.c:1155–1213

}

static int opt_get_array(const AVOption *o, void *dst, uint8_t **out_val)
{
    const unsigned count = *opt_array_pcount(dst);
    const uint8_t    sep = opt_array_sep(o);

    uint8_t *str     = NULL;
    size_t   str_len = 0;
    int ret;

    *out_val = NULL;

    for (unsigned i = 0; i < count; i++) {
        uint8_t buf[128], *out = buf;
        size_t out_len;

        ret = opt_get_elem(o, &out, sizeof(buf),
                           opt_array_pelem(o, *(void **)dst, i), 0);
        if (ret < 0)
            goto fail;

        out_len = strlen(out);
        if (out_len > SIZE_MAX / 2 - !!i ||
            !!i + out_len * 2 > SIZE_MAX - str_len - 1) {
            ret = AVERROR(ERANGE);
            goto fail;
        }

        //                         terminator     escaping  separator
        //                                ↓             ↓     ↓
        ret = av_reallocp(&str, str_len + 1 + out_len * 2 + !!i);
        if (ret < 0)
            goto fail;

        // add separator if needed
        if (i)
            str[str_len++] = sep;

        // escape the element
        for (unsigned j = 0; j < out_len; j++) {
            uint8_t val = out[j];
            if (val == sep || val == '\\')
                str[str_len++] = '\\';
            str[str_len++] = val;
        }
        str[str_len] = 0;

fail:
        if (out != buf)
            av_freep(&out);
        if (ret < 0) {
            av_freep(&str);
            return ret;
        }
    }

    *out_val = str;

    return 0;