check_alloc.h

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#ifndef CHECK_ALLOC_H
#define CHECK_ALLOC_H
#ifndef DS_UFC_H
#include <stdio.h>
#include <stdlib.h>
#endif

// wondering why the `static` here?
// the inline is just to expand as macro instead to define a function
// here is the reason:
// https://stackoverflow.com/questions/9428433/small-functions-defined-in-header-files-inline-or-static
// basically is to avoid multiple definitions problem when this unit is included
// in several sources and later is linked together.
// yes, in this case the include guard is not enough.
// but this is bad?


static inline void check_alloc(void *p) {
    if (p == NULL) {
        puts("Memory allocation error.");
        exit(EXIT_FAILURE);
    }
}


#endif