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Within arithmetic expressions, enumeration values of variables of a type created with the 'enum' command translate to index numbers from 0 to the number of elements minus 1. However, there was no range checking on this in the arithmetic subsystem, allowing the assignment of out-of-range values that did not correspond to any enumeration value. Variables of an enum type are internally unsigned short integers (NV_UINT16), like those created with 'integer -su', except with an additional discipline function (ENUM_disc). src/cmd/ksh93/bltins/enum.c, src/cmd/ksh93/include/builtins.h: - To implement range checking, the arithmetic system needs access to the 'nelem' (number of elements) member of 'struct Enum'. This is only defined locally in enum.c. We could move that to name.h so arith.c can access it, but enum.c has code that supports compiling as standalone. So, instead, define a quick extern function, b_enum_elem(), that does the necessary type conversion and returns a type's number of elements. - Add --man documentation for the arithmetic subsystem behaviour for enum types. Tell the enuminfo() function, which dynamically inserts values into the documentation, how to process new \f tags 'lastv' (the last-defined value) and 'lastn' (the number of the last element). src/cmd/ksh93/sh/arith.c: arith(): - For NV_UINT16 variables with an ENUM_disc discipline, check the range using b_enum_elem() and error out if necessary. Resolves: https://github.com/ksh93/ksh/issues/335 |
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| .. | ||
| args.c | ||
| arith.c | ||
| array.c | ||
| defs.c | ||
| deparse.c | ||
| expand.c | ||
| fault.c | ||
| fcin.c | ||
| init.c | ||
| io.c | ||
| jobs.c | ||
| lex.c | ||
| macro.c | ||
| main.c | ||
| name.c | ||
| nvdisc.c | ||
| nvtree.c | ||
| nvtype.c | ||
| parse.c | ||
| path.c | ||
| pmain.c | ||
| shcomp.c | ||
| streval.c | ||
| string.c | ||
| subshell.c | ||
| suid_exec.c | ||
| tdump.c | ||
| timers.c | ||
| trestore.c | ||
| waitevent.c | ||
| xec.c | ||