On 03/31/2014 08:51 AM, Peter Geoghegan wrote:
+ #ifdef HAVE_LOCALE_T
+ if (tss->locale)
+ strxfrm_l(pres, tss->buf1, Min(sizeof(Datum), len),
tss->locale);
+ else
+ #endif
+ strxfrm(pres, tss->buf1, Min(sizeof(Datum), len));
+
+ pres[Min(sizeof(Datum) - 1, len)] = '\0';
I'm afraid that trick isn't 100% reliable. The man page for strxrfm says:
RETURN VALUE
The strxfrm() function returns the number of bytes required to store
the transformed string in dest excluding the terminating null byte
('\0'). If the value returned is n or more, the contents of dest are
indeterminate.
Note the last sentence. To avoid the undefined behavior, you have to
pass a buffer that's large enough to hold the whole result, and then
truncate the result.
- Heikki
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