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Add pg_add_size_overflow() and friends

Jacob Champion <jchampion@postgresql.org>

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Commit: 8934f2136cd82333fd148954a13a8ab01f7bd7ef
Author: Jacob Champion <jchampion@postgresql.org>
Date: 2025-11-24T17:59:38Z
Releases: 19 (unreleased) 
Add pg_add_size_overflow() and friends

Commit 600086f47 added (several bespoke copies of) size_t addition with
overflow checks to libpq. Move this to common/int.h, along with
its subtraction and multiplication counterparts.

pg_neg_size_overflow() is intentionally omitted; I'm not sure we should
add SSIZE_MAX to win32_port.h for the sake of a function with no
callers.

Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/CAOYmi%2B%3D%2BpqUd2MUitvgW1pAJuXgG_TKCVc3_Ek7pe8z9nkf%2BAg%40mail.gmail.com

Files

PathChange+/−
src/include/common/int.h modified +67 −0
src/interfaces/libpq/fe-exec.c modified +12 −32
src/interfaces/libpq/fe-print.c modified +8 −28
src/interfaces/libpq/fe-protocol3.c modified +4 −23

Discussion