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Hi,

On Tuesday, June 25, 2013 3:24:59 AM UTC-5, K.J.Williams wrote:
> 
> BTW, I found another bug with DJGPP 
>
> if you have program that just uses :
> 
> #include<stdio.h>
> #include<string.h> 
> 
> ...and you use a function from ctype.h - as I did with isspace(),
> without including ctype.h in your includes ... DJGPP/GCC will NOT
> complain about it and will still compile it.

Originally, way way back, C didn't have a preprocessor at all. I
think, without explicit prototypes, C assumes every function returns
an int. C nowadays only has simple file inclusion, thus it's not true
modules, hence instead of the compiler checking for consistency, it's
left to the linker to resolve. But for varargs functions (e.g. printf)
you always have to include the header for prototype as it's allowed
to change the ABI.

> ...Secondly, I found this strange, but some how the ANSI C or C++
> standard doesn't consider the escape sequence '\b' (for backspace)
> as a white-space character when I use isspace() to check individual
> characters in a c-string. 

I've seen various tools (e.g. wc clones) that differ in what they
consider whitespace. Normally, they only consider obvious things
like blanks (0x20) and tabs (0x9), maybe form feed (0x12?). But
sometimes somebody will treat everything below blank (and above
tilde) as whitespace (or at least change it to a blank upon input
for easier handling).

http://en.wikipedia.org/wiki/Whitespace_character

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