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I have a long list of mappings from IDA function names (sub_??????) to known function prototypes. The prototype is complete, I mean it contains the return type, the name as in the code and the argument types and names.
My question is, how can I batch rename and overwrite all the data about the functions with this prototype information using an IDAPython script?
IDA has the idc.SetType method that would accept a function start offset and a function prototype string and will set that function's prototype, although it will not set the function's name.
The idc.SetType function is actually a convenience function around ida_typeinf.idc_parse_decl and ida_typeinf.apply_type, through a couple of other methods defined in the idc module. If you wanna set both function name and prototype, you could use idc.parse_decl to parse the prototype and then call idc.apply_type and idc.set_name to set the prototype and name.
Reading the code I linked to around idc.SetType really makes the API clear.
An example code could look something like this:
prototype_details = idc.parse_decl(PROTOTYPE, idc.PT_SILENT)
if prototype_details:
idc.set_name(FUNCTION_ADDRESS, prototype_details[0])
idc.apply_type(FUNCTION_ADDRESS, prototype_details)
Naturally, you'll need to replace PROTOTYPE and FUNCTION_ADDRESS with the function's prototype and address, as well as implement this inside a loop. I'll leave this an an exercise for the reader.