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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: error_t proposal
Date: Wed, 04 Sep 2019 15:20:06 -0700
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Thiago Adams <thiago.adams@gmail.com> writes:
> In my experience, most of the time I don't need to check
> for specific errors.
>
> For instance, I rarely need to do this:
>
> if (error == specific_error) { 
>  /*do something*/
> }
>
> in general I just check for general errors:
>
> if (error != error_success) {
>  /*do something*/
> }
>
> Some libraries uses 0 to say "no error" and others use
> 1 or true do say "no error".
[...]

What libraries use 1 to denote "no error"?

In my experience, error codes in C are almost always zero for
success, non-zero for failure (with either the value or errno
providing more information about the error).  (My experience does
have a UNIX/POSIX/Linux bias.)

Some functions (not many in the standard library) might return 0
for "false" and 1 or non-zero for "true" (for example isdigit()
et al), but for those functions "false" is not an error, just a
piece of information.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */