scl@uvaarpa.virginia.edu (Steve Losen) (10/18/89)
Here are some patches to apply to the version of ksh dated 06/15/88.
This is the new version that introduces quite a few more file name
matching operators such as !( ... ), and the new [[ ... ]] command, etc.
Apply these patches and edit the OPTIONS file so that BRACEPAT=1 and
recompile. This feature is undocumented (the distributed code has
a few bugs).
For those of you unfamiliar with C-shell brace patterns, they are a
shorthand for generating multiple words. Brace patterns are not pathname
matches, so you can generate words that do not match existing pathnames.
Suppose I need to create several new directories whose names are nearly
identical.
mkdir new/directory.{1,2,3}
expands to
mkdir new/directory.1 new/directory.2 new/directory.3
Note that new/directory.[1-3] doesn't work because the directories
don't exist.
The brace pattern is expanded first into multiple words and then these
words go through the normal pathname expansion if necessary. Thus,
/usr/src/{local,ksh,gnu,dwb}/*.o
is expanded to
/usr/src/local/*.o /usr/src/ksh/*.o /usr/src/gnu/*.o /usr/src/dwb/*.o
and then file name expansion takes places.
Brace patterns can be nested.
a{b,{c,{d,e}f}g}h
expands to
abh acgh adfgh aefgh
Note that the order of the patterns is preserved. Null patterns are legal.
mv /usr/local/bin/ksh{,.old}
is shorthand for
mv /usr/local/bin/ksh /usr/local/bin/ksh.old
Brace patterns have no effect (are left unexpanded) if any of the
following are true:
o unquoted white space between { and }
o no unquoted comma between { and }
o missing } or missing {
Enough of this rambling, here are the patches:
*** sh/expand.c.orig Thu Jun 1 09:56:15 1989
--- sh/expand.c Tue Oct 17 14:14:49 1989
***************
*** 452,458 ****
char *sp;
char comma;
int count = 0;
- ap->argchn = 0;
again:
apin = ap = todo;
todo = ap->argchn;
--- 452,457 ----
***************
*** 526,533 ****
}
endloop2:
/* check for match of '{' */
! if(*cp != '}')
ap = (struct argnod*)stak_begin();
else
ap = apin;
*cp = 0;
--- 525,534 ----
}
endloop2:
/* check for match of '{' */
! if(*cp != '}') {
ap = (struct argnod*)stak_begin();
+ ap->argflag = 0;
+ }
else
ap = apin;
*cp = 0;
*** sh/args.c.orig Thu Jun 1 09:55:59 1989
--- sh/args.c Tue Oct 17 11:45:04 1989
***************
*** 561,566 ****
--- 561,567 ----
if(sh.trapnote&SIGSET)
sh_exit(SIGFAIL);
ap = (struct argnod*)stak_begin();
+ ap->argchn = 0;
argp = ap->argval;
while(c= *s++)
{
--
Steve Losen scl@virginia.edu
University of Virginia Academic Computing Center