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Paul Eggert authored
* eval.c (verror): * doprnt.c (doprnt): * lisp.h (doprnt): * xdisp.c (vmessage): Use ptrdiff_t, not size_t, when using or implementing doprnt, since the sizes cannot exceed ptrdiff_t bounds anyway, and we prefer signed arithmetic to avoid comparison confusion. * doprnt.c (doprnt): Avoid a "+ 1" that can't overflow, but is a bit tricky.
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