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Message: [QUOTE="Arthur J. O'Dwyer, post: 1703786"] UB on the fact that perhaps (sizeof(struct x)+strlen(data)) < (sizeof *y), for one thing. But I'll assume that you made a typo in the malloc line, and meant to write ^^^^^^^^ (Incidentally, I'll evangelize again: The canonical c.l.c idiom for malloc calls would avoid this bug.) Not really. C99 offers a *new syntax* for variable-sized arrays in the last part of a struct, but the old C90 "struct hack" is still not supported. (In fact, it's explicitly "un-supported," since it explicitly invokes undefined behavior.) Exactly. -Arthur [/QUOTE]