SEI CERT C Coding Standard

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This compliant solution explicitly checks for the unexpected condition and handles it appropriately.:

Code Block
bgColor#ccccff
langc
if (a == b) {
  /* ... */
}
else if (a == c) {
  /* ... */
}
else {
  /* Handle error condition */
}

...

Tool

Version

Checker

Description

Compass/ROSE

  

Can detect some violations of this recommendation. In particular, it flags switch statements that do not have a default clause. ROSE should detect "fake switches" as well (that is, a chain of if statements each checking the value of the same variable). These if statements should always end in an else clause, or they should mathematically cover every possibility. For instance, consider the following:

  if (x > 0) {
	  /* ... */
  } else if (x < 0) {
    /* ... */
  } else if (x == 0) {
    /* ... */
  }
GCC
Include Page
GCC_V
GCC_V
 

Can detect some violations of this recommendation when the -Wswitch and -Wswitch-default flags are used.

 Klocwork 
Include Page
Klocwork_V
Klocwork_V
 LA_UNUSED 

LDRA tool suite

Include Page
LDRA_V
LDRA_V

12 S

Fully implemented.
PRQA QA-C
Include Page
PRQA_V
PRQA_V

0597
1460
1470
1472
2002
2004

Fully implemented

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