End oappend v2 #4152
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End oappend v2 #4152
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Since we validate the file existence ourselves, no need to have AsyncWebServer do it again.
Useful for checking that I haven't broken anything.
Remove the large stack buffer as we're just going to copy it in to a heap buffer anyways. Later we can refine the length estimation or use a rope-style dynamic data structure like DynamicBufferList.
Use a static Print* to transform old oappend calls to print calls.
Reduce the total number of calls by using printf_P and skipping atoi().
Use named functions to describe what's being printed.
Use a name that makes it a bit clearer what the output is. The new name is applied consistently through most uses. Usermods are not yet updated.
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Replacement for #4134 without any usermod changes, which can be considered as a separate PR.
Replace the usage of oppend with Arduino's Print abstraction. This permits efficient use of dynamically allocated memory for returning settings page data, without requiring a single large contiguous allocation up front, or risking smashing the stack.
This change also permits the output generation functions to easily use more sophisticated serialization functions such as printf, reducing the number of required function calls. With this optimization, the overall result is approximate parity in code size to the original implementation.