c - What is the systematic way when I want my code (client and server ) work on various scenarios? -


i developed in on 64-bit mac. , wish work under 2 scenarios:

  1. 64 bit server , 64 bit client

  2. 32 bit server , 64 bit client

only dealing *nix now

between communication of server , client b, exchange linked list of struct, of following type: 

typedef struct a{    unsigned long filed1;     int filed2;    char filed3;    struct a* next;  } a_t

both size of char , int consistent between 32-bit , 64-bit machine. concern more pointer , unsigned long.

my sending/receiving strategy is:

send , receive array of list_size * sizeof(a_t) bytes, since sizeof(a_t) have different values on 32-bit , 64-bit, array have misalignment. , wonder universal way fix problems of kind.

you should communicate in universal way independent of machine (both word size , endianness). easiest way send ascii, example, csv, in order of list. receiver can generate list this.

in principle should write irs, interface requirements specification, contract between 2 parties. should deal order of records, formats , (for example) minimum/maximum of numeric fields can be. practice write down, how minimal , if contract yourself. add comment in relevant functions on server side , on client side. programmer having deal in future knows constraints of interface.


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