Re: encapsulating directory operations

Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

Richard Harnden <richard.harnden@gmail.invalid> writes:
>

On 22/05/2025 23:32, Keith Thompson wrote:
>

"Paul Edwards" <mutazilah@gmail.com> writes:
>

[...]

>
In one of your library's headers:
extern const char ESCAPE;
In the corresponding *.c file:
const char ESCAPE = ('z' - 'a' == 25 ? '\x1b' : '\x27');
Change the name if you prefer.

>
Wouldn't that be a reserved identifier?

>
Yes, it would.  Good catch.
>
(Identifiers starting with E followed by either a digit or an uppercase
letter are reserved;  they could be defined as macros in <errno.h>.)

They are reserved only as macros, and only if <errno.h> has
been #include'd.

For this particular use, it's easy to make the definition work,
simply by adding

    #undef ESCAPE

before the declaration in the header file, and before the
definition in the source file (assuming of course that if
there are any #include <errno.h> they precede the #undef's).