2nd bug fix for regexp(3), in regsub()

[sources...@panda.uucp]

Mod.sources: Volume 4, Issue 33
Submitted by: genrad!decvax!utzoo!henry

I cringe with embarrassment! Another bug in regexp! In regsub.c, the
following line (line 72 in the original distribution):

if (*(dst-1) == '\0') { /* strncpy hit NUL. */

should read

if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */

This shows up as an occasional spurious complaint from regsub about
"damaged match string"... *if* the program invoking it, and the compiler
compiling it, happen to interact just right. It didn't show in any of
my tests because mine don't.

My thanks to H}vard Eidnes for finding this.

Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,linus,decvax}!utzoo!henry