sin/samba-mirror
1
0
Fork 0
mirror of https://github.com/samba-team/samba.git synced 2024-12-22 13:34:15 +03:00
Code

debug: Optimise early return when header string buffer is full

Browse Source 
The existing check is for truncation, not whether the buffer is full.
However, if the buffer is full (i.e. hs_len == sizeof(header_str) - 1)
then there's no use trying subsequent snprintf() calls because there
will be one byte available that already contains the NUL-terminator.
A subsequent call will just do a no-op truncation.

Check for full buffer instead.

This might be confusing because it isn't the standard check that is
done after snprintf() calls.  Is it worth it for a rare corner case?

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Volker Lendecke <vl@samba.org>
This commit is contained in:
Martin Schwenke 2021-10-13 20:40:34 +11:00 committed by Volker Lendecke
parent c5061ebe21
commit cb70eea053
1 changed files with 3 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
lib/util/debug.c
View File

@ -1698,7 +1698,7 @@ bool dbghdrclass(int level, int cls, const char *location, const char *func)
"[%s, %2d",
tvbuf.buf,
level);
if (state.hs_len >= sizeof(state.header_str)) {
if (state.hs_len >= sizeof(state.header_str) - 1) {
goto full;
}
@ -1711,7 +1711,7 @@ bool dbghdrclass(int level, int cls, const char *location, const char *func)
sizeof(state.header_str) - state.hs_len,
", pid=%u",
(unsigned int)getpid());
if (state.hs_len >= sizeof(state.header_str)) {
if (state.hs_len >= sizeof(state.header_str) - 1) {
goto full;
}
}
@ -1724,7 +1724,7 @@ bool dbghdrclass(int level, int cls, const char *location, const char *func)
(unsigned int)getegid(),
(unsigned int)getuid(),
(unsigned int)getgid());
if (state.hs_len >= sizeof(state.header_str)) {
if (state.hs_len >= sizeof(state.header_str) - 1) {
goto full;
}
}
@ -1735,9 +1735,6 @@ bool dbghdrclass(int level, int cls, const char *location, const char *func)
sizeof(state.header_str) - state.hs_len,
", class=%s",
classname_table[cls]);
if (state.hs_len >= sizeof(state.header_str)) {
goto full;
}
}
if (state.hs_len >= sizeof(state.header_str) - 1) {