Synopsis

Call functions with the correct number and type of arguments.

Enabled by default

Yes

Severity/Certainty

Medium/Medium

Full description

Do not call a function with the wrong number or type of arguments. Undefined behavior (UB) may arise as a result of invoking a function using a declaration that is incompatible with its definition or by supplying incorrect types or numbers of arguments.

Coding standards

Code examples

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

#include <stdio.h>
#include <string.h>

char *(*fp)() = strchr;

void example(void) {
  const char *c;
  fp = strchr;
  c = fp('e', "Hello");
  printf("%s\n", c);
}

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

#include <stdio.h>
#include <string.h>

char *(*fp)(const char *, int);

void example(void) {
  const char *c;
  fp = strchr;
  c = fp("Hello",'e');
  printf("%s\n", c);
}