(printable_field): Change type to `unsigned char'.
(mark_printable_field, is_printable_field): New functions.
Use them in place of all direct accesses of `printable_field'.
extract the 1,000,000-th field of some huge input file?
The first step is to rearrange things so that the values
in the printable_field array are all 0/1 rather than 0/1/2.
(RANGE_START_SENTINEL): Remove.
Store range-start indices in a hash table, rather than
overloading the `printable_field' array.
(range_start_ht): New global.
(hash_int, hash_compare_ints, is_range_start_index): New functions.
(print_kth): Use is_range_start_index; don't test printable_field.
(set_fields): Detect overflow.
(set_fields): Insert each range-start index into range_start_ht.
(main): Call set_fields only once, and only after
output_delimiter_specified and (if required) range_start_ht have
been defined.
(wc): Rename `file' parameter.
Set new local, `file', to be the file name, or (when it's NULL)
_("standard output") so that all uses of `file' use the proper value.
Use STREQ, not strcmp.
(posixly_correct): Remove.
(struct fstatus): New struct.
(write_counts): Output fields of width number_width.
Do not worry about POSIXLY_CORRECT.
Use null file, not empty-string file, to denote stdin,
since "" is a valid file name on some hosts.
(wc, wc_file): New arg fstatus. Use it to avoid invoking fstat
if possible.
(wc): Avoid problems if end_pos - current_pos overflows.
Do not print odd message if stdin has a read error.
(get_input_fstatus, compute_number_width): New functions.
(main): Use them to implement the new behavior.
Ignore POSIXLY_CORRECT.
(main): Use close_stdout via atexit.
Now `su --version > /dev/full' fails, as it should.
Somehow, the change of 2000-05-07 that purports to fix this
was not checked in.
(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.
Jim Meyering