Need Help Parsing From File

[Gabriel Genellina]

At Friday 8/12/2006 02:23, John Machin wrote:

>>> > > > ftxt=open(filename,"rt")
>>>
>>>Why did you do that?
>>>(1) Text mode is was and ever shall be the default, even with MS.
>>No, there used to be a flag in the stdio library, giving the 
>>default value when neither t or b was specified.
>>For the Borland C++ 3.1 help (about 1991):
>>  If "t" or "b" is not given in the string, the mode is governed by _fmode.
>>      If _fmode is set to O_BINARY, files are opened in binary mode.
>>      If _fmode is set to O_TEXT, they are opened in text mode.
>>MSC used to have a similar flag (perhaps using the same name).
>Indeed, and their docs say that the default for _fmode is text mode.

But anyone could change that *global* flag, making "binary" the 
default afterwards. So if you really wanted a text file you had to be explicit.

>>All of this predates wide usage of ANSI C 89, which made the "t" 
>>flag obsolete.
>>
>>>(2) Seeing we're referring to docs and standards: Microsoft C 5.0
>>>Optimizing Compiler, Run-Time Library Reference manual says "The t
>>>option is not part of the ANSI standard for open, but is a Microsoft
>>>extension and should not be used where ANSI portability is required".
>>A "t" after the initial recognized characters should be ignored by 
>>any conforming compiler. I think the idea was to allow for 
>>extensions like fopen(fn, "rt;reclen=128") but except esoteric 
>>platforms I doubt anyone is using that.
>
>So it should be ignored.
>So, back to the question: why did you get into the habit of writing 
>"rt"  when it was pointless?

Because it was *not* pointless before ANSI C.


-- 
Gabriel Genellina
Softlab SRL 

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