[TUHS] Happy birthday, Dennis Ritchie! [ really sun vs dec/apollo --> X and NeWS ]
Clem Cole
clemc at ccc.com
Wed Sep 20 00:32:20 AEST 2017
On Mon, Sep 18, 2017 at 10:50 PM, Larry McVoy <lm at mcvoy.com> wrote:
> So in the BitKeeper source, perror is redifined to my_perror which is
> this:
>
> void
> my_perror(char *file, int line, char *msg)
> {
> char *p = 0;
> int save = errno;
>
> if (p = getenv("_BK_VERSION")) {
> if (strneq(p, "bk-", 3)) p += 3;
> fprintf(stderr, "%s:%d (%s): ", file, line, p);
> } else {
> fprintf(stderr, "%s:%d: ", file, line);
> }
> if (p = strerror(errno)) {
> fprintf(stderr, "%s: %s\n", msg, p);
> } else {
> fprintf(stderr, "%s: errno=%d\n", msg, errno);
> }
> errno = save;
> }
>
> libc should do that.
+1, indeed! - knowing where the the error came from (file and line) is
huge. Yeah it means putting it in the preprocessor, which has some issues;
but it comes back to a previous comment I have made -- I really believe a
serious production language needs a preprocessor that is carefully used
because there are places (like this one) that just makes the right things
happen.
Clem
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