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lib: eliminate size_t casts

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Add new functions in `curlx/warnless.h` for controlled type
conversions:

* curlx_uitouz, convert unsigned into to size_t (should always work)
* curlx_uztoso, convert size_t to curl_off_t, capping at CURL_OFF_T_MAX
* curlx_sztouz, convert ssize_t to size_t, return TRUE when ok
* curlx_sotouz_range, convert curl_off_t to size_t interval, capping
  values to interval bounds

Remove some unnecesary casts, convert some internal recv functions
to the "return result, have size_t* arg" pattern.

Closes #19495
This commit is contained in:
Stefan Eissing 2025-11-12 15:58:49 +01:00 • committed by Daniel Stenberg
parent 78a610cb83
commit cb2bcb681f
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13 changed files with 170 additions and 156 deletions
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8
lib/http.c
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@ -2222,9 +2222,11 @@ static CURLcode set_reader(struct Curl_easy *data, Curl_HttpReq httpreq)
result = Curl_creader_set_null(data);
}
else if(data->set.postfields) {
if(postsize > 0)
result = Curl_creader_set_buf(data, data->set.postfields,
(size_t)postsize);
size_t plen = curlx_sotouz_range(postsize, 0, SIZE_MAX);
if(plen == SIZE_MAX)
return CURLE_OUT_OF_MEMORY;
else if(plen)
result = Curl_creader_set_buf(data, data->set.postfields, plen);
else
result = Curl_creader_set_null(data);
}