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Paul Eggert authored
The code was computing A - B, where A and B are pointers, and B is random garbage. This can lead to core dumps on platforms that have special pointer registers, and it also leads to core dumps on x86-64 when compiled with gcc -ftrapv. The fix is to compute A - B only when B is initialized properly. * coding.c (coding_set_source, coding_set_destination): Return void. (coding_change_source, coding_change_destinations): New functions, with the old behaviors of coding_set_source and coding_set_destination. All callers that need an offset changed to use these new functions.
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