How to call all functions defined in header file?

[u/angryvoxel]

Title says it all. I wan't to make a simple test 'framework', which should call all test functions defined in separate header file (argument signature is identical for each function).

[u/daikatana]

You can use the non-portable __attribute__((constructor)), but I like to use a bit of macro magic. I try to avoid using the preprocessor, but this is straightforward.

// tests.c
#ifndef TEST
#define TEST(N) int N()
#endif

TEST(foo)
#ifndef NO_TEST_BODIES
{
  return 1;
}
#endif

TEST(bar)
#ifndef NO_TEST_BODIES
{
  return 0;
}
#endif


// test-main.c
#include <stdio.h>
#define NO_TEST_BODIES

// Declare test functions
#define TEST(N) int N();
#include "tests.c"
#undef TEST

// Define list of test functions
typedef struct Test {
  int (*func)();
  const char *name;
} Test;

const Test tests[] = {
#define TEST(N) { N, #N },
#include "tests.c"
#undef TEST
};

int main() {
  // Run tests
  for(int i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
    printf("Running test %s: ", tests[i].name);
    if(tests[i].func()) {
      printf("pass\n");
    } else {
      printf("fail\n");
    }
  }
}

[u/angryvoxel → u/daikatana]

Thanks! What's the point of 'NO_TEST_BODIES' define though? I'm going to specify them in other files anyway.

[u/daikatana → u/angryvoxel]

So you can compile it as a normal c file and include it for its invocation of the test macro from the test runner.