Berkeley CSUA MOTD:Entry 26215
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2025/07/08 [General] UID:1000 Activity:popular
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2002/10/16-17 [Computer/SW/Languages/C_Cplusplus, Computer/HW/Memory] UID:26215 Activity:moderate
10/16   In C, What's the difference between offset_t and ptrdiff_t?  I used to
        use size_t for variables representing offsets, but now I think size_t
        might not be right.  Thanks.  --- yuen
        \_ I don't know for certain, but here's my thinking:
           ptrdiff_t is signed and should be sufficient to store the
           displacement between two items of the same type.  size_t (produced
           by sizeof) is unsigned and should be sufficient to store the
           size of a type.  offset_t (produced by offsetof) is unsigned (I
           think) and should be sufficient to store the offset of an element
           within a type.  Therefore, aside from the sign differences,
           the range of ptrdiff_t may be greater than that of size_t which
                                         \_ I take this back.  It makes
                                            no sense. (Not that the rest
                                            does.) --jameslin
           may be greater than that of offset_t.  Maybe you should ask on
           comp.lang.c. --jameslin
           \_ size_t is usually 32 bits, and is used to represent the size
              of objects or buffers and the like, off_t is used to represent
              offsets in files and is often 64bits.  Why does this matter
              though?  Outside the interfaces these are used in, there
              is no special meaning to them.
              \_ I see.  off_t (and offset_t on SunOS5) is for file offsets,
                 not memory offsets.  So I should use ptrdiff_t for memory
                 offsets then.  Thanks.  --- yuen
2025/07/08 [General] UID:1000 Activity:popular
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