[tz] defensive value for define on Solaris causes load of timerule to fail

[Paul Eggert]

On 06/12/2017 04:25 PM, Jonathan Leffler wrote:
> I was under the impression Paul had just said that using snprintf() 
> was OK now as it was part of C99 — though he mistyped C99 as C89

Oops, I thought that snprintf was in C89. I guess if we're still 
assuming only C89 or better then that's a bug that should be fixed. 
Please see attached proposed patch (parts 3 and 4, the latter to fix a 
typo in 3).

For localtime.c, it's probably better to avoid sprintf/snprintf/etc. In 
the good old days people would avoid sprintf because it pulled in a 
bunch of floating-point code (to support %f etc.) even when not needed. 
Nowadays the major knock on sprintf/etc. is that it doesn't work if the 
result contains more than INT_MAX bytes.

That being said, strcat should be avoided there, if only to pacify picky 
compilers and human readers that worry about a buffer overrun that 
cannot really happen. I installed the attached patches 1 and 2 to try to 
make progress in that area.

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