[PATCH] ash: improve / fix glob expansion

[Denys Vlasenko]

>> I plan to massage it into this - do you see any bugs?
> Looks okay.

I'm committing this version, yell if something wrong.

hasmeta(const char *p)
{
        static const char chars[] ALIGN1 = {
                '*', '?', '[', '\\', CTLQUOTEMARK, CTLESC, 0
        };

        for (;;) {
                p = strpbrk(p, chars);
                if (!p)
                        break;
                switch ((unsigned char) *p) {
                case CTLQUOTEMARK:
                        for (;;) {
                                p++;
                                if (*p == CTLQUOTEMARK)
                                        break;
                                if (*p == CTLESC)
                                        p++;
                                if (*p == '\0') /* huh? */
                                        return 0;
                        }
                        break;
                case '\\':
                case CTLESC:
                        p++;
                        if (*p == '\0')
                                return 0;
                        break;
                case '[':
                        if (!strchr(p + 1, ']')) {
                                /* It's not a properly closed [] pattern,
                                 * but other metas may follow.
Continue checking.
                                 * my[file* _is_ globbed by bash
                                 * and matches filenames like "my[file1".
                                 */
                                break;
                        }
                        /* fallthrough */
                default:
                /* case '*': */
                /* case '?': */
                        return 1;
                }
                p++;
        }

        return 0;