Synopsis

(Required) Identifiers declared in the same scope and name space shall be distinct.

Enabled by default

Yes

Severity/Certainty

Low/Medium

Full description

Identifier names were found that are not distinct in their first 31 characters from other names in the same scope.

Coding standards

Code examples

The following code example fails the check and will give a warning:

/*         1234567890123456789012345678901********* */
extern int n01_var_hides_var____________31x;
static int n01_var_hides_var____________31y;

/*         1234567890123456789012345678901********* */
static int n02_function_hides_var_______31x;
void       n02_function_hides_var_______31y (void) {}

void foo(void) {
  int i;
  switch(f1()) {
  case 1: {
      do {
	for(i = 0; i < 10; i++) {
	  if(f3()) {
	    /*     1234567890123456789012345678901********* */
	    int    n03_var_hides_var____________31x;
	    int    n03_var_hides_var____________31y;
	  }
	}
      } while(f2());
    }
  }
}

/*   1234567890123456789012345678901********* */
enum E {
     n04_var_hides_enum_const_____31x,
};

/*   1234567890123456789012345678901********* */
int  n04_var_hides_enum_const_____31y;

/*           1234567890123456789012345678901********* */
void bar(int n05_var_hides_parameter______31x) {
  int        n05_var_hides_parameter______31y;
}

/*      1234567890123456789012345678901********* */
#define n06_var_hides_macro_name_____31x 123
int     n06_var_hides_macro_name_____31y;

/*          1234567890123456789012345678901********* */
int         n07_type_hides_var___________31x;
typedef int n07_type_hides_var___________31y;

/*    1234567890123456789012345678901********* */
union U {
  int n08_field_hides_field________31x;
  int n08_field_hides_field________31y;
};

struct S {
  int n09_field_hides_field________31x;
  int n09_field_hides_field________31y;
};

The following code example passes the check and will not give a warning about this issue:

/*           1234567890123456789012345678901********* */
extern int   n01_var_in_different_scope___31x;
void         n02_different_function_name__31x (void) {
  static int n01_var_in_different_scope___31y;

  switch(fn()) {
  case 1:
    {
      int    n01_var_in_different_scope___31a;
    }
    break;
  case 2:
    {
      int    n01_var_in_different_scope___31b;
    }
    break;
  }
  {
      int    n01_var_in_different_scope___31c;
  }
  {
      int    n01_var_in_different_scope___31d;
  }
}

/* exception for typedef of tag name*/
typedef struct s1 {
  int sf1;
} s1;

typedef union u1 {
  int uf1;
  int uf2;
} u1;

typedef enum e1 {
  ec1, ec2
} e1;

/* identifiers in different name spaces */
/*    1234567890123456789012345678901********* */
union n02_var_hides_union_tag______31x {
  int v1;
  unsigned int v2;
}     n02_var_hides_union_tag______31y;

/*   1234567890123456789012345678901********* */
enum n03_var_hides_enum_tag_______31x {
     n04_tag_hides_enum_const_____31x
};

/*   1234567890123456789012345678901********* */
int  n03_var_hides_enum_tag_______31y;

/*     1234567890123456789012345678901********* */
struct n04_tag_hides_enum_const_____31y {
  int ff2;
};

void foo() {
/*    1234567890123456789012345678901********* */
  int n05_label_hides_var__________31x;
  {
/*1234567890123456789012345678901********* */
  n05_label_hides_var__________31y:
    n05_label_hides_var__________31x = 1;
  }
}

void bar(void) {
  int i;
  switch(f1()) {
  case 1: {
      do {
	for(i = 0; i < 10; i++) {
	  if(f3()) {
	    /*     1234567890123456789012345678901********* */
	    struct n06_var_hides_struct_tag_____31x {
	      int f1;
	    }      n06_var_hides_struct_tag_____31y;
	  }
	}
      } while(f2());
    }
  }
}