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struct string_mx;
typedef struct string_mx string_mx;
/* Function declarations */
extern errno_t strcpy_m(string_mx *s1, const string_mx *s2);
extern errno_t strcat_m(string_mx *s1, const string_mx *s2) ;
/* etc. */
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In the internal header file, struct string_mx is fully defined but not visible to a user of the data abstraction.
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struct string_mx {
size_t size;
size_t maxsize;
unsigned char strtype;
char *cstr;
};
/* Function declarations */
extern errno_t strcpy_m(string_mx *s1, const string_mx *s2);
extern errno_t strcat_m(string_mx *s1, const string_mx *s2) ;
/* etc. */
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Modules that implement the abstract data type include both the external and internal definitions, while users of the data abstraction include only the external string_m.h file. This allows the implementation of the string_mx data type to remain private.
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