>>>> If you're willing to assume you're using gcc,
>>> We're not.
>> That's what I'd expect - but the message I was responding to seemed
>> to be entirely predicated upon that, [...]
> My fault for the misunderstanding, and I wouldn't suggest for a
> minute that PCB / gEDA should become gcc only.
Well, it's also entirely possible I'm at least as much to blame as you
are; it wouldn't be the first time I read something that wasn't
actually there into text.
> I am interested in your examples though..
Here's a really simple example which does a recursive tree walk,
throwing out to the top level if a node with a particular property is
found. Obviously, there are lots of ways to do this particular task;
this technique is most useful when the tree walk is more complicated
than this (and possibly off in another file, or part of a library
package, or some such).
void walk_tree(TREE *t, void (*fn)(TREE *))
{
int i;
(*fn)(t);
for (i=t->nchildren-1;i>=0;i--) walk_tree(t->children[i]);
}
int tree_has_interesting_node(TREE *t, int (*interest)(TREE *))
{
__label__ found;
void check_node(TREE *n)
{ if ((*interest)(n)) goto found; /* "throw" */
}
walk_tree(t,&check_node);
return(0);
found:; /* "catch" */
return(1);
}
This, of course, is a toy demo example. For some real examples, look
at stuff in my FTP server, ftp.rodents-montreal.org. Specifically:
/mouse/hacks/pnmtartan.c - all three gotos in this program are throws.
/mouseware/local-src/halign/halign-20080930/halign.c - the "goto retc"
is a throw.
/mouseware/moussh/moussh-20080703/ - for good examples here, see
agent-server.c, which uses this technique to throw out of a parser in
case of an error, or various functions, such as hk_ssh_dss_checksig in
alg-hk-ssh-dss.c, or rem_chanreq in client.c, which use this to throw
out of parse_data in case of error. One of the best examples is
config.s, another case of throwing out of a parser in case of error
(see cferr_throw inside load_config).
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