rather than suffering silently.
Before, expr would silently overflow and wrap around:
$ expr 9223372036854775808 = 0 # $(echo 2^63|bc)
1
Now it detects the problem and exits nonzero:
$ ./expr $(echo 2^63|bc) = 0
./expr: 9223372036854775808: integer is too large
too few operands ("missing operand after `xxx'") or
too many operands ("extra operand `xxx'").
Include "quote.h" and/or "error.h" if it wasn't already being included.
Accept a bool argument specifying whether to evaluate the
expression. This is to allow short-circuit evaluation. All
callers changed.
(null): Report that a string is zero even if it has
a form like "-0" or "00".
(eval1, eval): Use short-circuit evaluation for | and &.
(eval): Return 0 if both arguments are null or zero, instead
of returning the first argument.
(main): Use initialize_exit_failure rather than
setting exit_failure directly; this optimizes away redundant assignments.
(EXPR_FAILURE): Renamed from EXPR_ERROR, for
consistency with the other programs' naming conventions.
All uses changed.
of 2003-09-19. Now, AUTHORS is a comma-separated list of strings.
Update the call to parse_long_options so that `AUTHORS, NULL' are the
last parameters.
* src/true.c (main): Append NULL to version_etc argument list.
* src/sys2.h (case_GETOPT_VERSION_CHAR): Likewise.
(EXPR_INVALID, EXPR_ERROR): New constants.
(nomoreargs, null, toarith, nextarg): Return bool, not int.
(syntax_error): New function, exiting with status 2. Use it
insteading of printing "syntax error" ourselves.
(main): Initialize exit_failure to EXPR_ERROR.
Exit with EXPR_INVALID on syntax error (too few arguments).
(nextarg): Use strcmp, not strcoll; strcoll might return
an undesirable 0, or might fail.
(docolon, eval4, eval3): Exit with status 3 on invalid argument type
or other such error.
(eval2): Report an error if strcoll fails in a string comparison.
(eval2): Do comparisons as strings first, before trying to convert to
integer. This avoids loss of information and wrong result, e.g. for
"expr '00' '<' '0!'", where you don't want to convert '00' to '0'.
(cmpf, less_than, less_equal, equal, not_equal, greater_equal,
greater_than, arithf, arithdivf, plus, minus, multiply, divide, mod):
Remove.
(eval4, eval3, eval2): Rewrite to avoid the need for the above macros
and functions.
