Kunshchikov Vladimir wrote:
> Hello Alvaro,
>
> here goes v4 version: removed unused header.
>
> Compilation of this code snippet with -Wall -Wexter -std=c89 doesn't produce any warnings.
Great, thanks.
+const char *
+get_cfp_error(cfp* fp)
+{
+#ifdef HAVE_LIBZ
+ if(fp->compressedfp){
+ int errnum;
+ static const char fallback[] = "Zlib error";
+ const int maxlen = 255;
+ const char *errmsg = gzerror(fp->compressedfp, &errnum);
+ if(!errmsg || !memchr(errmsg, 0, maxlen))
+ errmsg = fallback;
+
+ return errnum == Z_ERRNO ? strerror(errno) : errmsg;
+ }#endif
+ return strerror(errno);
+}
This "maxlen" business and the fallback error message are strange. We
have roughly equivalent code in pg_basebackup.c, which has been working
since 2011 (commit 048d148fe631), and it looks like this:
#ifdef HAVE_LIBZ
static const char *
get_gz_error(gzFile gzf)
{int errnum;const char *errmsg;
errmsg = gzerror(gzf, &errnum);if (errnum == Z_ERRNO) return strerror(errno);else return errmsg;
}
#endif
Perhaps you can drop the memchr/fallback tricks and adopt the
pg_basebackup coding? Or is there a specific reason to have the memchr
check?
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services