bsd_glob.c

Altera recommends the following system configuration: * Pentium II 400 with 512-MB system memory (fa

			*bufnext++ = M_SET;
			if (c == BG_NOT)
				*bufnext++ = M_NOT;
			c = *qpatnext++;
			do {
				*bufnext++ = CHAR(c);
				if (*qpatnext == BG_RANGE &&
				    (c = qpatnext[1]) != BG_RBRACKET) {
					*bufnext++ = M_RNG;
					*bufnext++ = CHAR(c);
					qpatnext += 2;
				}
			} while ((c = *qpatnext++) != BG_RBRACKET);
			pglob->gl_flags |= GLOB_MAGCHAR;
			*bufnext++ = M_END;
			break;
		case BG_QUESTION:
			pglob->gl_flags |= GLOB_MAGCHAR;
			*bufnext++ = M_ONE;
			break;
		case BG_STAR:
			pglob->gl_flags |= GLOB_MAGCHAR;
			/* collapse adjacent stars to one,
			 * to avoid exponential behavior
			 */
			if (bufnext == patbuf || bufnext[-1] != M_ALL)
			    *bufnext++ = M_ALL;
			break;
		default:
			*bufnext++ = CHAR(c);
			break;
		}
	}
	*bufnext = BG_EOS;
#ifdef GLOB_DEBUG
	qprintf("glob0:", patbuf);
#endif /* GLOB_DEBUG */

	if ((err = glob1(patbuf, pglob)) != 0) {
		pglob->gl_flags = oldflags;
		return(err);
	}

	/*
	 * If there was no match we are going to append the pattern
	 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
	 * and the pattern did not contain any magic characters
	 * GLOB_NOMAGIC is there just for compatibility with csh.
	 */
	if (pglob->gl_pathc == oldpathc &&
	    ((pglob->gl_flags & GLOB_NOCHECK) ||
	      ((pglob->gl_flags & GLOB_NOMAGIC) &&
	       !(pglob->gl_flags & GLOB_MAGCHAR))))
	{
#ifdef GLOB_DEBUG
		printf("calling globextend from glob0\n");
#endif /* GLOB_DEBUG */
		pglob->gl_flags = oldflags;
		return(globextend(qpat, pglob));
        }
	else if (!(pglob->gl_flags & GLOB_NOSORT))
		qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
		    pglob->gl_pathc - oldpathc, sizeof(char *), 
		    (pglob->gl_flags & (GLOB_ALPHASORT|GLOB_NOCASE))
			? ci_compare : compare);
	pglob->gl_flags = oldflags;
	return(0);
}

static int
ci_compare(const void *p, const void *q)
{
    const char *pp = *(const char **)p;
    const char *qq = *(const char **)q;
    int ci;
    while (*pp && *qq) {
	if (tolower(*pp) != tolower(*qq))
	    break;
	++pp;
	++qq;
    }
    ci = tolower(*pp) - tolower(*qq);
    if (ci == 0)
	return compare(p, q);
    return ci;
}

static int
compare(const void *p, const void *q)
{
	return(strcmp(*(char **)p, *(char **)q));
}

static int
glob1(Char *pattern, glob_t *pglob)
{
	Char pathbuf[MAXPATHLEN+1];

	/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
	if (*pattern == BG_EOS)
		return(0);
	return(glob2(pathbuf, pathbuf, pattern, pglob));
}

/*
 * The functions glob2 and glob3 are mutually recursive; there is one level
 * of recursion for each segment in the pattern that contains one or more
 * meta characters.
 */
static int
glob2(Char *pathbuf, Char *pathend, Char *pattern, glob_t *pglob)
{
	Stat_t sb;
	Char *p, *q;
	int anymeta;

	/*
	 * Loop over pattern segments until end of pattern or until
	 * segment with meta character found.
	 */
	for (anymeta = 0;;) {
		if (*pattern == BG_EOS) {		/* End of pattern? */
			*pathend = BG_EOS;

			if (g_lstat(pathbuf, &sb, pglob))
				return(0);

			if (((pglob->gl_flags & GLOB_MARK) &&
			    pathend[-1] != BG_SEP
#ifdef DOSISH
			    && pathend[-1] != BG_SEP2
#endif
			    ) && (S_ISDIR(sb.st_mode)
			    || (S_ISLNK(sb.st_mode) &&
			    (g_stat(pathbuf, &sb, pglob) == 0) &&
			    S_ISDIR(sb.st_mode)))) {
				*pathend++ = BG_SEP;
				*pathend = BG_EOS;
			}
			++pglob->gl_matchc;
#ifdef GLOB_DEBUG
                        printf("calling globextend from glob2\n");
#endif /* GLOB_DEBUG */
			return(globextend(pathbuf, pglob));
		}

		/* Find end of next segment, copy tentatively to pathend. */
		q = pathend;
		p = pattern;
		while (*p != BG_EOS && *p != BG_SEP
#ifdef DOSISH
		       && *p != BG_SEP2
#endif
		       ) {
			if (ismeta(*p))
				anymeta = 1;
			*q++ = *p++;
		}

		if (!anymeta) {		/* No expansion, do next segment. */
			pathend = q;
			pattern = p;
			while (*pattern == BG_SEP
#ifdef DOSISH
			       || *pattern == BG_SEP2
#endif
			       )
				*pathend++ = *pattern++;
		} else			/* Need expansion, recurse. */
			return(glob3(pathbuf, pathend, pattern, p, pglob));
	}
	/* NOTREACHED */
}

static int
glob3(Char *pathbuf, Char *pathend, Char *pattern,
      Char *restpattern, glob_t *pglob)
{
	register Direntry_t *dp;
	DIR *dirp;
	int err;
	int nocase;
	char buf[MAXPATHLEN];

	/*
	 * The readdirfunc declaration can't be prototyped, because it is
	 * assigned, below, to two functions which are prototyped in glob.h
	 * and dirent.h as taking pointers to differently typed opaque
	 * structures.
	 */
	Direntry_t *(*readdirfunc)(DIR*);

	*pathend = BG_EOS;
	errno = 0;

#ifdef VMS
        {
            Char *q = pathend;
            if (q - pathbuf > 5) {
                q -= 5;
                if (q[0] == '.' && tolower(q[1]) == 'd' && tolower(q[2]) == 'i'
		    && tolower(q[3]) == 'r' && q[4] == '/')
		{
                    q[0] = '/';
                    q[1] = BG_EOS;
                    pathend = q+1;
                }
            }
        }
#endif
	if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
		/* TODO: don't call for ENOENT or ENOTDIR? */
		if (pglob->gl_errfunc) {
			g_Ctoc(pathbuf, buf);
			if (pglob->gl_errfunc(buf, errno) ||
			    (pglob->gl_flags & GLOB_ERR))
				return (GLOB_ABEND);
		}
		return(0);
	}

	err = 0;
	nocase = ((pglob->gl_flags & GLOB_NOCASE) != 0);

	/* Search directory for matching names. */
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
               readdirfunc = (Direntry_t *(*)(DIR *))pglob->gl_readdir;
	else
		readdirfunc = my_readdir;
	while ((dp = (*readdirfunc)(dirp))) {
		register U8 *sc;
		register Char *dc;

		/* Initial BG_DOT must be matched literally. */
		if (dp->d_name[0] == BG_DOT && *pattern != BG_DOT)
			continue;
		for (sc = (U8 *) dp->d_name, dc = pathend;
		     (*dc++ = *sc++) != BG_EOS;)
			continue;
		if (!match(pathend, pattern, restpattern, nocase)) {
			*pathend = BG_EOS;
			continue;
		}
		err = glob2(pathbuf, --dc, restpattern, pglob);
		if (err)
			break;
	}

	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		(*pglob->gl_closedir)(dirp);
	else
		PerlDir_close(dirp);
	return(err);
}


/*
 * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 * add the new item, and update gl_pathc.
 *
 * This assumes the BSD realloc, which only copies the block when its size
 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 * behavior.
 *
 * Return 0 if new item added, error code if memory couldn't be allocated.
 *
 * Invariant of the glob_t structure:
 *	Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 *	gl_pathv points to (gl_offs + gl_pathc + 1) items.
 */
static int
globextend(const Char *path, glob_t *pglob)
{
	register char **pathv;
	register int i;
	char *copy;
	const Char *p;

#ifdef GLOB_DEBUG
	printf("Adding ");
        for (p = path; *p; p++)
                (void)printf("%c", CHAR(*p));
        printf("\n");
#endif /* GLOB_DEBUG */

	if (pglob->gl_pathv)
		pathv = Renew(pglob->gl_pathv,
			      (2 + pglob->gl_pathc + pglob->gl_offs),char*);
	else
		New(0,pathv,(2 + pglob->gl_pathc + pglob->gl_offs),char*);
	if (pathv == NULL)
		return(GLOB_NOSPACE);

	if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
		/* first time around -- clear initial gl_offs items */
		pathv += pglob->gl_offs;
		for (i = pglob->gl_offs; --i >= 0; )
			*--pathv = NULL;
	}
	pglob->gl_pathv = pathv;

	for (p = path; *p++;)
		continue;
	New(0, copy, p-path, char);
	if (copy != NULL) {
		g_Ctoc(path, copy);
		pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
	}
	pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
	return(copy == NULL ? GLOB_NOSPACE : 0);
}


/*
 * pattern matching function for filenames.  Each occurrence of the *
 * pattern causes a recursion level.
 */
static int
match(register Char *name, register Char *pat, register Char *patend, int nocase)
{
	int ok, negate_range;
	Char c, k;

	while (pat < patend) {
		c = *pat++;
		switch (c & M_MASK) {
		case M_ALL:
			if (pat == patend)
				return(1);
			do
			    if (match(name, pat, patend, nocase))
				    return(1);
			while (*name++ != BG_EOS);
			return(0);
		case M_ONE:
			if (*name++ == BG_EOS)
				return(0);
			break;
		case M_SET:
			ok = 0;
			if ((k = *name++) == BG_EOS)
				return(0);
			if ((negate_range = ((*pat & M_MASK) == M_NOT)) != BG_EOS)
				++pat;
			while (((c = *pat++) & M_MASK) != M_END)
				if ((*pat & M_MASK) == M_RNG) {
					if (nocase) {
						if (tolower(c) <= tolower(k) && tolower(k) <= tolower(pat[1]))
							ok = 1;
					} else {
						if (c <= k && k <= pat[1])
							ok = 1;
					}
					pat += 2;
				} else if (nocase ? (tolower(c) == tolower(k)) : (c == k))
					ok = 1;
			if (ok == negate_range)
				return(0);
			break;
		default:
			k = *name++;
			if (nocase ? (tolower(k) != tolower(c)) : (k != c))
				return(0);
			break;
		}
	}
	return(*name == BG_EOS);
}

/* Free allocated data belonging to a glob_t structure. */
void
bsd_globfree(glob_t *pglob)
{
	register int i;
	register char **pp;

	if (pglob->gl_pathv != NULL) {
		pp = pglob->gl_pathv + pglob->gl_offs;
		for (i = pglob->gl_pathc; i--; ++pp)
			if (*pp)
				Safefree(*pp);
		Safefree(pglob->gl_pathv);
	}
}

static DIR *
g_opendir(register Char *str, glob_t *pglob)
{
	char buf[MAXPATHLEN];

	if (!*str) {
#ifdef MACOS_TRADITIONAL
		strcpy(buf, ":");
#else
		strcpy(buf, ".");
#endif
	} else {
		g_Ctoc(str, buf);
	}

	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		return((*pglob->gl_opendir)(buf));
	else
	    return(PerlDir_open(buf));
}

static int
g_lstat(register Char *fn, Stat_t *sb, glob_t *pglob)
{
	char buf[MAXPATHLEN];

	g_Ctoc(fn, buf);
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		return((*pglob->gl_lstat)(buf, sb));
#ifdef HAS_LSTAT
	return(PerlLIO_lstat(buf, sb));
#else
	return(PerlLIO_stat(buf, sb));
#endif /* HAS_LSTAT */
}

static int
g_stat(register Char *fn, Stat_t *sb, glob_t *pglob)
{
	char buf[MAXPATHLEN];

	g_Ctoc(fn, buf);
	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
		return((*pglob->gl_stat)(buf, sb));
	return(PerlLIO_stat(buf, sb));
}

static Char *
g_strchr(Char *str, int ch)
{
	do {
		if (*str == ch)
			return (str);
	} while (*str++);
	return (NULL);
}

#ifdef notdef
static Char *
g_strcat(Char *dst, const Char *src)
{
	Char *sdst = dst;

	while (*dst++)
		continue;
	--dst;
	while((*dst++ = *src++) != BG_EOS)
	    continue;

	return (sdst);
}
#endif

static void
g_Ctoc(register const Char *str, char *buf)
{
	register char *dc;

	for (dc = buf; (*dc++ = *str++) != BG_EOS;)
		continue;
}

#ifdef GLOB_DEBUG
static void
qprintf(const char *str, register Char *s)
{
	register Char *p;

	(void)printf("%s:\n", str);
	for (p = s; *p; p++)
		(void)printf("%c", CHAR(*p));
	(void)printf("\n");
	for (p = s; *p; p++)
		(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
	(void)printf("\n");
	for (p = s; *p; p++)
		(void)printf("%c", ismeta(*p) ? '_' : ' ');
	(void)printf("\n");
}
#endif /* GLOB_DEBUG */