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Standardize LSN formatting by zero padding

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This commit standardizes the output format for LSNs to ensure consistent
representation across various tools and messages.  Previously, LSNs were
inconsistently printed as `%X/%X` in some contexts, while others used
zero-padding.  This often led to confusion when comparing.

To address this, the LSN format is now uniformly set to `%X/%08X`,
ensuring the lower 32-bit part is always zero-padded to eight
hexadecimal digits.

Author: Japin Li <japinli@hotmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de>
Discussion: https://postgr.es/m/ME0P300MB0445CA53CA0E4B8C1879AF84B641A@ME0P300MB0445.AUSP300.PROD.OUTLOOK.COM
This commit is contained in:
Álvaro Herrera
2025-07-07 13:57:43 +02:00
parent 62a17a9283
commit 2633dae2e4
67 changed files with 681 additions and 681 deletions
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6
src/bin/pg_basebackup/pg_basebackup.c
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@@ -487,7 +487,7 @@ reached_end_position(XLogRecPtr segendpos, uint32 timeline,
if (r < 0)
pg_fatal("could not read from ready pipe: %m");
if (sscanf(xlogend, "%X/%X", &hi, &lo) != 2)
if (sscanf(xlogend, "%X/%08X", &hi, &lo) != 2)
pg_fatal("could not parse write-ahead log location \"%s\"",
xlogend);
xlogendptr = ((uint64) hi) << 32 | lo;
@@ -629,7 +629,7 @@ StartLogStreamer(char *startpos, uint32 timeline, char *sysidentifier,
param->wal_compress_level = wal_compress_level;
/* Convert the starting position */
if (sscanf(startpos, "%X/%X", &hi, &lo) != 2)
if (sscanf(startpos, "%X/%08X", &hi, &lo) != 2)
pg_fatal("could not parse write-ahead log location \"%s\"",
startpos);
param->startptr = ((uint64) hi) << 32 | lo;
@@ -2255,7 +2255,7 @@ BaseBackup(char *compression_algorithm, char *compression_detail,
* value directly in the variable, and then set the flag that says
* it's there.
*/
if (sscanf(xlogend, "%X/%X", &hi, &lo) != 2)
if (sscanf(xlogend, "%X/%08X", &hi, &lo) != 2)
pg_fatal("could not parse write-ahead log location \"%s\"",
xlogend);
xlogendptr = ((uint64) hi) << 32 | lo;