Improve `doprnt' and its usage. (Bug#8545)
src/doprnt.c (doprnt): Make sure `format' is never accessed beyond `format_end'. Remove support for %l as a conversion specifier. Don't use xrealloc. Improve diagnostics when the %l size modifier is used. Update the commentary. src/eval.c (verror): Simplify calculation of size_t. src/coding.c (Ffind_operation_coding_system): Fix diagnostic error messages.
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