Use const pointer in write functions

[vincent-d]

The buffer passed to the write function should be const.

[pellepl]

Thanks! Will run it thru the tests next week, currently in vacation mode 😉

[pellepl]

Hi again,

building it (gcc 4.8.4) yields warnings:

src/spiffs_hydrogen.c: In function ‘spiffs_hydro_write’:
src/spiffs_hydrogen.c:420:44: warning: cast discards ‘__attribute__((const))’ qualifier from pointer target type [-Wcast-qual]
     res = spiffs_object_modify(fd, offset, (u8_t *)buf, m_len);
                                            ^
src/spiffs_hydrogen.c:423:19: warning: cast discards ‘__attribute__((const))’ qualifier from pointer target type [-Wcast-qual]
     u8_t *buf_8 = (u8_t *)buf;
                   ^
src/spiffs_hydrogen.c:429:44: warning: cast discards ‘__attribute__((const))’ qualifier from pointer target type [-Wcast-qual]
     res = spiffs_object_append(fd, offset, (u8_t *)buf, remaining);
                                            ^

Would you please fix these before I merge it in?

[vincent-d]

@pellepl Sorry I forgot to do it until now.

Const pointer are used in more write functions, the warning should disappear.

Only drawback is that the HAL write function prototype has been updated.

[pellepl]

Hi, Sorry for belated answer. Busy times for me now. Thanks for your work! Ah yes, suspected the callbacks would have to change. I am planning a major rewrite of spiffs which will change some other API stuff also. Instead of pushing two different patches with API changes in both, I think the best way is to incorporate yours in the major change. Meaning this request will be put on ice for some time, if that's ok with you.

Cheers / Peter