Re: Fw: Patch to 'tr' utility

[Jim Meyering]

"Matthew Smith" <address@hidden> wrote:
>     Here is a patch from John Sumsion on the cygwin list, for your perusal:

Thanks, but what is the motivation for this?
Does this mean that every text-filtering program
(e.g., sort, cut, fold, join, etc.) should to do something similar?

>> Here is a patch that ensures that tr console output is NOT buffered.  I
>> only use cygwin, so I have no idea if this builds right on linux or any
>> other platform.
>>
>> diff -u -r textutils-2.0.21/src/tr.c textutils-2.0.21.jgs/src/tr.c
>> --- textutils-2.0.21/src/tr.c 2002-02-11 01:34:16.000000000 -0700
>> +++ textutils-2.0.21.jgs/src/tr.c 2002-06-25 15:41:28.000000000 -0600
>> @@ -1894,6 +1894,9 @@
>>        by text-mode reads (like CR and ^Z).  */
>>     SET_BINARY2 (STDIN_FILENO, STDOUT_FILENO);
>>
>> +  /* Do not buffer console output. */
>> +  if (isatty((int) stdout)) SETVBUF (stdout, NULL, _IONBF, 0);
>> +
>>     if (squeeze_repeats && non_option_args == 1)
>>       {
>>         set_initialize (s1, complement, in_squeeze_set);
>>