[edk2-devel] [PATCH] MdePkg/BaseLib: Base64Decode(): don't declare variables in nested blocks
Laszlo Ersek
lersek at redhat.com
Tue Jul 16 22:59:26 UTC 2019
The EDK II C Coding Standards Specification (v2.20) strongly discourages
variable declarations in nested block scope:
5 Source Files
5.4 Code File Structure
5.4.1 Scoping Rules
5.4.1.1 Scope
> Block (local) Scope
>
> [...]
>
> Data declarations may follow the opening brace of a compound statement,
> regardless of nesting depth, and before any code generating statements
> have been entered. Other than at the outermost block of a function body,
> this type of declaration is strongly discouraged.
Hoist such variable declarations in Base64Decode() to the outermost
function scope.
Cc: Liming Gao <liming.gao at intel.com>
Cc: Michael D Kinney <michael.d.kinney at intel.com>
Cc: Philippe Mathieu-Daudé <philmd at redhat.com>
Cc: Zhichao Gao <zhichao.gao at intel.com>
Fixes: 35e242b698cdc6205e99a6d6a188bf27fecf9fb4
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1980
Reported-by: Zhichao Gao <zhichao.gao at intel.com>
Signed-off-by: Laszlo Ersek <lersek at redhat.com>
---
Notes:
Repo: https://github.com/lersek/edk2.git
Branch: b64_decode_no_nested_bz1980
MdePkg/Library/BaseLib/String.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/MdePkg/Library/BaseLib/String.c b/MdePkg/Library/BaseLib/String.c
index 6198ccbc9672..45198373f25c 100644
--- a/MdePkg/Library/BaseLib/String.c
+++ b/MdePkg/Library/BaseLib/String.c
@@ -1978,6 +1978,9 @@ Base64Decode (
UINT32 Accumulator;
UINTN OriginalDestinationSize;
UINTN SourceIndex;
+ CHAR8 SourceChar;
+ UINT32 Base64Value;
+ UINT8 DestinationOctet;
if (DestinationSize == NULL) {
return RETURN_INVALID_PARAMETER;
@@ -2054,10 +2057,6 @@ Base64Decode (
// Decoding loop.
//
for (SourceIndex = 0; SourceIndex < SourceSize; SourceIndex++) {
- CHAR8 SourceChar;
- UINT32 Base64Value;
- UINT8 DestinationOctet;
-
SourceChar = Source[SourceIndex];
//
--
2.19.1.3.g30247aa5d201
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