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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-11-30 14:45:01 -0800 |
|---|---|---|
| committer | Dongkyun Son <dongkyun.s@samsung.com> | 2019-12-26 12:51:35 +0900 |
| commit | 34e5786b4b06ffcdff209ceb11b70eee49886cb5 (patch) | |
| tree | 8653e35f42805e47d120fc1e8182fca2368d8bf7 | |
| parent | 3384a409183653d0736b91d0dd68675acea0104e (diff) | |
| download | emulator-kernel-34e5786b4b06ffcdff209ceb11b70eee49886cb5.tar.gz emulator-kernel-34e5786b4b06ffcdff209ceb11b70eee49886cb5.tar.bz2 emulator-kernel-34e5786b4b06ffcdff209ceb11b70eee49886cb5.zip | |
unifdef: use memcpy instead of strncpy
commit 38c7b224ce22c25fed04007839edf974bd13439d upstream.
New versions of gcc reasonably warn about the odd pattern of
strncpy(p, q, strlen(q));
which really doesn't make sense: the strncpy() ends up being just a slow
and odd way to write memcpy() in this case.
There was a comment about _why_ the code used strncpy - to avoid the
terminating NUL byte, but memcpy does the same and avoids the warning.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[dongkyun.s: cherry-pick stable linux-4.9.y commit 37370fadd2da for gcc 9 build]
Change-Id: I2f005aa7c6642d76d818f1fda7722f345095b8a9
| -rw-r--r-- | scripts/unifdef.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/scripts/unifdef.c b/scripts/unifdef.c index 7493c0ee51cc..db00e3e30a59 100644 --- a/scripts/unifdef.c +++ b/scripts/unifdef.c @@ -395,7 +395,7 @@ usage(void) * When we have processed a group that starts off with a known-false * #if/#elif sequence (which has therefore been deleted) followed by a * #elif that we don't understand and therefore must keep, we edit the - * latter into a #if to keep the nesting correct. We use strncpy() to + * latter into a #if to keep the nesting correct. We use memcpy() to * overwrite the 4 byte token "elif" with "if " without a '\0' byte. * * When we find a true #elif in a group, the following block will @@ -450,7 +450,7 @@ static void Idrop (void) { Fdrop(); ignoreon(); } static void Itrue (void) { Ftrue(); ignoreon(); } static void Ifalse(void) { Ffalse(); ignoreon(); } /* modify this line */ -static void Mpass (void) { strncpy(keyword, "if ", 4); Pelif(); } +static void Mpass (void) { memcpy(keyword, "if ", 4); Pelif(); } static void Mtrue (void) { keywordedit("else"); state(IS_TRUE_MIDDLE); } static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); } static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); } |