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Tom Lane f8715ec866 Support "j" length modifier in snprintf.c. 
POSIX has for a long time defined the "j" length modifier for
printf conversions as meaning the size of intmax_t or uintmax_t.
We got away without supporting that so far, because we were not
using intmax_t anywhere.  However, commit e6be84356 re-introduced
upstream's use of intmax_t and PRIdMAX into zic.c.  It emerges
that on some platforms (at least FreeBSD and macOS), <inttypes.h>
defines PRIdMAX as "jd", so that snprintf.c falls over if that is
used.  (We hadn't noticed yet because it would only be apparent
if bad data is fed to zic, resulting in an error report, and even
then the only visible symptom is a missing line number in the
error message.)

We could revert that decision from our copy of zic.c, but
on the whole it seems better to update snprintf.c to support
this standard modifier.  There might well be extensions,
now or in future, that expect it to work.

I did this in the lazy man's way of translating "j" to either
"l" or "ll" depending on a compile-time sizeof() check, just
as was done long ago to support "z" for size_t.  One could
imagine promoting intmax_t to have full support in snprintf.c,
for example converting fmtint()'s value argument and internal
arithmetic to use [u]intmax_t not [unsigned] long long.  But
that'd be more work and I'm hesitant to do it anyway: if there
are any platforms out there where intmax_t is actually wider
than "long long", this would doubtless result in a noticeable
speed penalty to snprintf().  Let's not go there until we have
positive evidence that there's a reason to, and some way to
measure what size of penalty we're taking.

Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/3210703.1765236740@sss.pgh.pa.us
2025-12-09 11:43:25 -05:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
contrib Remove useless casts in format arguments 2025-12-09 07:33:08 +01:00
doc Widen MultiXactOffset to 64 bits 2025-12-09 13:53:03 +02:00
src Support "j" length modifier in snprintf.c. 2025-12-09 11:43:25 -05:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml headerscheck ccache support 2025-12-04 11:23:23 +01:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:54:03 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add commit 86b276a4a9 to .git-blame-ignore-revs. 2025-12-05 14:21:12 -06:00
.gitattributes Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Support "j" length modifier in snprintf.c. 2025-12-09 11:43:25 -05:00
configure.ac Support "j" length modifier in snprintf.c. 2025-12-09 11:43:25 -05:00
COPYRIGHT Align organization wording in copyright statement 2025-05-16 11:20:07 -04:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Support "j" length modifier in snprintf.c. 2025-12-09 11:43:25 -05:00
meson_options.txt Add support for basic NUMA awareness 2025-04-07 23:08:17 +02:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.