Re: [9fans] Weirdness with 9660srv and file names (extensions)?

["Russ Cox" <rsc@plan9.bell-labs.com>]

The ISO9660 spec (actually I was reading ECMA 119, which
is supposedly identical) is fairly clear about this issue:
every file on the volume should have a . and a ; in
its name, since they are separators rather than file
name characters.  That is, every name is supposed to
be of the form

	file name . file extension ; version

Most writers (including our very own mk9660) don't
put the . and ; in when there is nothing to separate,
so our mishandling of the trailing . hadn't been
noticed before.

Thus I propose replacing

		p = strchr(d->name, ';');
		if(p != 0) {
			vers = strtoul(p+1, 0, 10);
			memset(p, 0, NAMELEN-(p-d->name));
		}

with

		if(fmt!='9' && !(d->mode&CHDIR)){
			/*
			 * ISO 9660 actually requires that you always have a . and a ;,
			 * even if there is no version and no extension.  Very few writers
			 * do this.  If the version is present, we use it for qid.vers.
			 * If there is no extension but there is a dot, we strip it off.
			 * (DOS heads couldn't comprehend the dot as a file name character
			 * rather than as just a separator between name and extension.)
			 *
			 * We don't do this for directory names because directories are
			 * not allowed to have extensions and versions.
			 */
			if((p=strchr(d->name, ';')) != nil){
				vers = strtoul(p+1, 0, 0);
				d->qid.vers = vers;
				memset(p, 0, NAMELEN-(p-d->name));
			}
			if((p=strchr(d->name, '.')) != nil && *(p+1)=='\0')
				memset(p, 0, NAMELEN-(p-d->name));
		}

Russ