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(eval4, eval3): Check for integer overflow.
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change from the old (Emacs) behavior, and POSIX allows us to treat [z-a]
as an empty range.
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what POSIX requires. Also, don't let anchors match
newline; this fixes an incompatibility with tradition and with POSIX.
Don't warn about leading ^. POSIX says it is unspecified whether
^ is a special character, which means that implementations can
either treat it as special or not, but either way a warning is not
allowed (unless the regexp is otherwise invalid). Instead, anchor
the expression but treat ^ as an anchor; this is the traditional
behavior (e.g., Solaris 10).
(eval4, eval3, eval2): Treat non-numeric args, division by zero,
and the like as invalid expressions (exit status 2), not as
failure of 'expr' (exit status 3). This is more consistent with
how Solaris behaves.
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Don't bother allocating a buffer.
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remove quotes from the string, too.
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Include "quote.h".
Rather than this: error (..., "...`%s'...", arg);
do this: error (..., "...%s...", quote (arg));
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(looks_like_integer): New function.
(toarith): Use it. Also, use xstrtoimax rather than rolling our
own diagnostics.
(eval2): Don't look for trouble if !evaluate; this simplifies things.
Compare numbers using string comparison, so that overflow is
not possible.
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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
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by Debian 5.2.1-2.
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reference to obsolescent macro XMALLOC.
All uses replaced by xmalloc and free.
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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.
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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.
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(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.
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parse_long_options, so that it works even on systems for which
sizeof char* != sizeof int.
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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.
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Begin each WRITTEN_BY string with `Written by ' and end it with `.'.
Mark each WRITTEN_BY string as translatable.
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the call to parse_long_options so that `AUTHORS, NULL' are the last parameters.
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Don't include closeout.h.
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(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.
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xrealloc, and xcalloc return values and of xrealloc's first argument.
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`exit (1)' to `exit (EXIT_FAILURE)', and
`usage (1)' to `usage (EXIT_FAILURE)'.
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instead of hard-coding --help and --version descriptions.
Split --help output into smaller pieces.
Use fputs, not printf.
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(main): Do not worry about POSIXLY_CORRECT, as it's OK for
expr to have options (so long as they do not begin with digits).
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All callers changed.
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(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'.
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(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.
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