3580b4a0cd
Commit 92785dac2 copied some logic related to advancement of inStart from pqParseInput3 into getRowDescriptions and getAnotherTuple, because it wanted to allow user-defined row processor callbacks to potentially longjmp out of the library, and inStart would have to be updated before that happened to avoid an infinite loop. We later decided that that API was impossibly fragile and reverted it, but we didn't undo all of the related code changes, and this bit of messiness survived. Undo it now so that there's just one place in pqParseInput3's processing where inStart is advanced; this will simplify addition of better tracing support. getParamDescriptions had grown similar processing somewhere along the way (not in 92785dac2; I didn't track down just when), but it's actually buggy because its handling of corrupt-message cases seems to have been copied from the v2 logic where we lacked a known message length. The cases where we "goto not_enough_data" should not simply return EOF, because then we won't consume the message, potentially creating an infinite loop. That situation now represents a definitively corrupt message, and we should report it as such. Although no field reports of getParamDescriptions getting stuck in a loop have been seen, it seems appropriate to back-patch that fix. I chose to back-patch all of this to keep the logic looking more alike in supported branches. Discussion: https://postgr.es/m/2217283.1615411989@sss.pgh.pa.us
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