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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 12:54:27 +09:00
parent 399f7ce3da
commit ae53537e21
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;
}
}