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doc: add rules in C coding guidelines

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This patch adds rules in C coding guidelines.

Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
This commit is contained in:
Shiqing Gao 2019-04-30 10:09:53 +08:00 committed by wenlingz
parent 8543486462
commit 42baefd392
1 changed files with 24 additions and 0 deletions
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24
doc/developer-guides/c_coding_guidelines.rst
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@ -1832,6 +1832,30 @@ Compliant example::
showcase_a++, showcase_b++;
C-EP-22: Magic numbers shall be used with restrictions
======================================================
Only the following cases shall be allowed:
a) The magic number is defined as a MACRO with a name clearly indicating its
meaning.
b) The meaning of the magic number is clearly documented in the comments before
its usage.
c) The meaning of the magic number is straightforward in the specific context.
Compliant example::
#define APIC_ID_MASK 0xff000000U
uint32_t showcase = APIC_ID_MASK;
.. rst-class:: non-compliant-code
Non-compliant example::
uint32_t showcase = 0xff000000U;
Types
*****