freepascal.compiler/docs/progex/ctest.c

#include <string.h>

extern char* SubStr(const char*, int, int);

int main()
{
    char *s;
    int FromPos, ToPos;

    s = strdup("Test");
    FromPos = 2;
    ToPos = 3;
    printf("Result from SubStr: '%s'\n", SubStr(s, FromPos, ToPos));
    return 0;
}