Differences

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--- sei_cert_c_coding_standard [2019/08/06 20:08] – rpjday
+++ sei_cert_c_coding_standard [2019/08/06 21:17] (current) – [3.5 DCL38-C. Use the correct syntax when declaring a flexible array member] rpjday
@@ Line 3: / Line 3: @@
   * [[https://wiki.sei.cmu.edu/confluence/display/c]]
-== = = Preprocessor (PRE) ====
+===== Preprocessor (PRE) =====
 ==== 2.1 PRE30-C. Do not create a universal character name through concatenation ====
@@ Line 9: / Line 9: @@
 ==== 2.2 PRE31-C. Avoid side effects in arguments to unsafe macros ====
+An unsafe function-like macro is one whose expansion results in evaluating one of its parameters more than once or not at all.
+<code>
+#define ABS(x) (((x) < 0) ? -(x) : (x)) /* UNSAFE */
+void func(int n) {
+  /* Validate that n is within the desired range */
+  ++n;
+  int m = ABS(n);
+  /* ... */
+}
+</code>
 ==== 2.3 PRE32-C. Do not use preprocessor directives in invocations of function-like macros ====
+The arguments to a macro must not include preprocessor directives, such as #define, #ifdef, and #include.
+<code>
+void func(const char *src) {
+  /* Validate the source string; calculate size */
+  char *dest;
+  /* malloc() destination string */
+  memcpy(dest, src,
+    #ifdef PLATFORM1
+    #else
+    #endif
+  );
+  /* ... */
+}
+</code>
+===== 3 Declarations and Initialization (DCL) =====
+==== 3.1 DCL30-C. Declare objects with appropriate storage durations ====
+==== 3.2 DCL31-C. Declare identifiers before using them ====
+==== 3.3 DCL36-C. Do not declare an identifier with conflicting linkage classifications ====
+==== 3.4 DCL37-C. Do not declare or define a reserved identifier ====
+==== 3.5 DCL38-C. Use the correct syntax when declaring a flexible array member ====
+  * The incomplete array type must be the last element within the structure.
+  * There cannot be an array of structures that contain a flexible array member.
+  * Structures that contain a flexible array member cannot be used as a member of another structure.
+  * The structure must contain at least one named member in addition to the flexible array member.
+<code>
+struct flexArrayStruct{
+  int num;
+  int data[];
+};
+</code>
+==== 3.6 DCL39-C. Avoid information leakage when passing a structure across a trust boundary ====
+==== 3.7 DCL40-C. Do not create incompatible declarations of the same function or object ====
+==== 3.8 DCL41-C. Do not declare variables inside a switch statement before the first case label ====