Re: zerofile function
First af all, some advice:
- Please don't top-post.
- Please respond to the bug-gawk list instead of or in addition to my
personal e-mail address.
- Please post just plain text and not HTML.
- Please quote the relevant parts of the original message, and not the
whole stuff.
(Disclaimer: I'm quoting the full thread so others can see the whole stuff
you sent just to my personal address)
Short answer: Your original code (at the end of this long post) is correct.
Don't spoil it.
And now, look below to see my responses to some specific parts of your
messages.
El 16/05/2013 23:32, david ward escribió:
> Sorry to exhaust you with my mistakes but correcting all references TO ARGV
> to ARGC I still get the same errors. My main programming language is C++
> hence the mistake. I have manage to find some errors in the functions
> presented in the manual so please don't dismiss me too lightly
Don't worry. We are always willing to help interested people.
But, your original code is correct, so don't try to amend it. Doing so just
makes things worse.
>
> On Thu, May 16, 2013 at 10:09 PM, david ward <bamberward@...> wrote:
>
>> /gawk/awkscripts-> gawk -f ./zerofile.awk -f ./zerofile_funct.awk -f
>> ./checkzero.awk ./tee2 ./empty ./tee3 ./empty2
>> gawk: ./zerofile.awk:18: zerofile(ARGC[Argind], Argind) # get
>> syntax error for ARGV[Argind]
>> gawk: ./zerofile.awk:18: ^ use of
>> non-array as array
>>
>> gawk: ./zerofile_funct.awk:2: function zerofile(ARGC[Argind], Argind )
>> gawk: ./zerofile_funct.awk:2: ^ syntax error
>> gawk: ./zerofile_funct.awk:2: error: function `zerofile': can't use
>> special variable `ARGC' as a function parameter
>> ~/gawk/awkscripts->
ARGC is a scalar variable (the number or arguments), ARGV is the array of
arguments. So ARGV[x]is correct, but ARGC[x] doesn't makes sense.
In addition, ARGC is a special variable, so you can't use this name for a
formal argument of a function.
>>
>> On Thu, May 16, 2013 at 10:06 PM, david ward <bamberward@...> wrote:
>>
>>> Noticed that I did not make changes to the files correctly. Making these
>>> corrections does not alter the error message:
As said, making such corrections makes the things worse.
>>>
>>> #!/usr/bin/gawk -f
>>> # All known awk implementations silently skip over zero-length files.
>>> This is a by-product of awk's implicit
>>> # read-a-record-and-match-against-the-rules loop:
>>> # when awk tries to read a record from an empty file, it immediately
>>> receives an end of file
>>> # indication, closes the file, and proceeds on to the next command-line
>>> data file, WITHOUT executing any
>>> # user-level awk program code.
>>> # Using gawk's ARGIND variable , it is possible to detect when an empty
>>> data file
>>> # has been skipped.
>>>
>>> # zerofile.awk --- library file to process empty input files
>>>
>>>
>>> BEGIN { Argind = 0 }
>>>
>>> ARGIND > Argind + 1 {
>>>
>>> for (Argind++; Argind < ARGIND; Argind++)
>>> zerofile(ARGC[Argind], Argind) # get syntax error for
>>> ARGV[Argind]
>>>
>>>
>>> }
>>>
>>> ARGIND != Argind { Argind = ARGIND }
>>>
>>> END {
>>> d = ARGV[Argind]
>>> if (ARGIND > Argind)
>>> for (Argind++; Argind <= ARGIND; Argind++)
>>> zerofile(ARG[Argind], Argind)
>>>
>>>
>>> }
>>> #!/usr/bin/gawk -f
>>> function zerofile(ARGC[Argind], Argind )
>>> {
>>> print ARGIND,Argind, ARGV[Argind]
>>>
>>> }
>>> #!/usr/bin/gawk -f
>>> {print}
>>>
>>>
>>>
>>> On Thu, May 16, 2013 at 9:52 PM, david ward <bamberward@...> wrote:
>>>
>>>> Doesn't work with gawk 4.0.2 on Ubuntu 12.04
>>>> removing the assignment to v in the source code I get
See the previous comment
>>>> 1037 16/05/13 21:45:45 history
>>>> ~/gawk/awkscripts-> gawk -f ./zerofile.awk -f ./zerofile_funct.awk -f
>>>> ./checkzero.awk ./tee2 ./empty ./tee3 ./empty2
>>>> gawk: ./zerofile_funct.awk:2: function zerofile(ARGC{Argind], Argind )
>>>> gawk: ./zerofile_funct.awk:2: ^ syntax error
>>>> gawk: ./zerofile_funct.awk:2: error: function `zerofile': can't use
>>>> special variable `ARGC' as a function parameter
>>>> ~/gawk/awkscripts->
>>>> #!/usr/bin/gawk -f
>>>> # All known awk implementations silently skip over zero-length files.
>>>> This is a by-product of awk's implicit
>>>> # read-a-record-and-match-against-the-rules loop:
>>>> # when awk tries to read a record from an empty file, it immediately
>>>> receives an end of file
>>>> # indication, closes the file, and proceeds on to the next command-line
>>>> data file, WITHOUT executing any
>>>> # user-level awk program code.
>>>> # Using gawk's ARGIND variable , it is possible to detect when an empty
>>>> data file
>>>> # has been skipped.
>>>>
>>>> # zerofile.awk --- library file to process empty input files
>>>>
>>>>
>>>> BEGIN { Argind = 0 }
>>>>
>>>> ARGIND > Argind + 1 {
>>>> # v = ARGV[Argind]
>>>>
>>>> for (Argind++; Argind < ARGIND; Argind++)
>>>> zerofile(a, Argind) # get syntax error for ARGV[Argind]
>>>> submitted bug report apparently works ok in
>>>> # in 4.0.1 on windows XP
>>>>
>>>>
>>>> }
>>>>
>>>> ARGIND != Argind { Argind = ARGIND }
>>>>
>>>> END {
>>>> d = ARGV[Argind]
>>>> if (ARGIND > Argind)
>>>> for (Argind++; Argind <= ARGIND; Argind++)
>>>> zerofile(d, Argind)
>>>>
>>>> }
>>>> #!/usr/bin/gawk -f
>>>> function zerofile(ARGC{Argind], Argind )
>>>> {
>>>> print ARGIND,Argind, ARGV[Argind]
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> On Thu, May 16, 2013 at 3:42 PM, Manuel Collado <mcollado@...>wrote:
>>>>
>>>>> El 16/05/2013 14:23, david ward escribió:
>>>>>
>>>>> I don't know if this a bug or not but I get a syntax error when when
>>>>>> trying to pass ARGC[Argind] to zerofile. gawk version: 4.0.2 OS:
>>>>>> Ubuntu 12.4
>>>>>>
>>>>>> #!/usr/bin/gawk -f
>>>>>> # All known awk implementations silently skip over zero-length files.
>>>>>> This is a by-product of awk's implicit
>>>>>> # read-a-record-and-match-**against-the-rules loop:
>>>>>> # when awk tries to read a record from an empty file, it immediately
>>>>>> receives an end of file
>>>>>> # indication, closes the file, and proceeds on to the next command-line
>>>>>> data file, WITHOUT executing any
>>>>>> # user-level awk program code.
>>>>>> # Using gawk's ARGIND variable , it is possible to detect when an empty
>>>>>> data file
>>>>>> # has been skipped.
>>>>>>
>>>>>> # zerofile.awk --- library file to process empty input files
>>>>>>
>>>>>>
>>>>>> BEGIN { Argind = 0 }
>>>>>>
>>>>>> ARGIND > Argind + 1 {
>>>>>> v = ARGV[Argind]
>>>>>> for (Argind++; Argind < ARGIND; Argind++)
>>>>>> zerofile(a, Argind) # get syntax error for ARGV[Argind]
>>>>>>
>>>>>> }
>>>>>>
>>>>>> ARGIND != Argind { Argind = ARGIND }
>>>>>>
>>>>>> END {
>>>>>> d = ARGV[Argind]
>>>>>> if (ARGIND > Argind)
>>>>>> for (Argind++; Argind <= ARGIND; Argind++)
>>>>>> zerofile(d, Argind)
>>>>>>
>>>>>> }
>>>>>> my zerofile function
>>>>>> #!/usr/bin/gawk -f
>>>>>> function zerofile(a, Argind )
>>>>>> {
>>>>>> print ARGIND,Argind, ARGV[Argind]
>>>>>>
>>>>>> }
>>>>>> I wrote this to understand how the post increment operator took
>>>>>> effect
>>>>>> on the parameters
>>>>>>
>>>>>>
>>>>> Works Ok with GNU Awk 4.0.1 on Windows XP. No syntax errors, gives
>>>>> expected output.
Tested also with GAWK 4.0.2. Same (good) results.
Regards.
--
--
Manuel Collado - http://lml.ls.fi.upm.es/~mcollado
>> I don't understand what top-post means.
>>> - Please don't top-post.
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