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libpq: Fix PQtrace() format for non-printable characters

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PQtrace() was generating its output for non-printable characters without
casting the characters printed with unsigned char, leading to some extra
"\xffffff" generated in the output due to the fact that char may be
signed.

Oversights introduced by commit 198b3716dba6, so backpatch down to v14.

Author: Ran Benita <ran@unusedvar.com>
Discussion: https://postgr.es/m/a3383211-4539-459b-9d51-95c736ef08e0@app.fastmail.com
Backpatch-through: 14
This commit is contained in:
Michael Paquier 2025-09-03 12:54:23 +09:00
parent c6ea528b47
commit db9405493b
1 changed files with 2 additions and 2 deletions
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4
src/interfaces/libpq/fe-trace.c
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@ -113,7 +113,7 @@ pqTraceOutputByte1(FILE *pfdebug, const char *data, int *cursor)
* that completes ErrorResponse and NoticeResponse messages.
*/
if (!isprint((unsigned char) *v))
fprintf(pfdebug, " \\x%02x", *v);
fprintf(pfdebug, " \\x%02x", (unsigned char) *v);
else
fprintf(pfdebug, " %c", *v);
*cursor += 1;
@ -212,7 +212,7 @@ pqTraceOutputNchar(FILE *pfdebug, int len, const char *data, int *cursor, bool s
else
{
fwrite(v + next, 1, i - next, pfdebug);
fprintf(pfdebug, "\\x%02x", v[i]);
fprintf(pfdebug, "\\x%02x", (unsigned char) v[i]);
next = i + 1;
}
}