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Editorial Team
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Asked: 2026-05-13T09:41:05+00:00

#define STRING(s) (((String*)s)-1) what in the world is (((String*)s)-1) ? typedef struct String {

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#define STRING(s) (((String*)s)-1)

what in the world is (((String*)s)-1)?

typedef 
struct String {
    int length;
    int capacity;
    unsigned check;
    char ptr[0];
} String;
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1 Answer

  1. Editorial Team

    You’re casting s to a String *. Then you’re subtracting one from it (making it point to the previous whatever).

    Anything more specific would need to know the definition of String – but (WILD SPECULATION) I would guess the application uses dual VB/C-style strings (null terminated, preceded by the length), and this function changes it from a form suitable for C functions (pointer to the first character) into one usable for the other type (pointer to the length).

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