tw.init.c revision 145479 
1/* $Header: /src/pub/tcsh/tw.init.c,v 3.34 2005/01/05 16:06:15 christos Exp $ */
2/*
3 * tw.init.c: Handle lists of things to complete
4 */
5/*-
6 * Copyright (c) 1980, 1991 The Regents of the University of California.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33#include "sh.h"
34
35RCSID("$Id: tw.init.c,v 3.34 2005/01/05 16:06:15 christos Exp $")
36
37#include "tw.h"
38#include "ed.h"
39#include "tc.h"
40#include "sh.proc.h"
41
42#define TW_INCR	128
43
44typedef struct {
45    Char **list, 			/* List of command names	*/
46	  *buff;			/* Space holding command names	*/
47    int    nlist, 			/* Number of items		*/
48           nbuff,			/* Current space in name buf	*/
49           tlist,			/* Total space in list		*/
50	   tbuff;			/* Total space in name buf	*/
51} stringlist_t;
52
53
54static struct varent *tw_vptr = NULL;	/* Current shell variable 	*/
55static Char **tw_env = NULL;		/* Current environment variable */
56static Char  *tw_word;			/* Current word pointer		*/
57static struct KeyFuncs *tw_bind = NULL;	/* List of the bindings		*/
58#ifndef HAVENOLIMIT
59static struct limits *tw_limit = NULL;	/* List of the resource limits	*/
60#endif /* HAVENOLIMIT */
61static int tw_index = 0;		/* signal and job index		*/
62static DIR   *tw_dir_fd = NULL;		/* Current directory descriptor	*/
63static Char   tw_retname[MAXPATHLEN+1];	/* Return buffer		*/
64static int    tw_cmd_got = 0;		/* What we need to do		*/
65static stringlist_t tw_cmd  = { NULL, NULL, 0, 0, 0, 0 };
66static stringlist_t tw_item = { NULL, NULL, 0, 0, 0, 0 };
67#define TW_FL_CMD	0x01
68#define TW_FL_ALIAS	0x02
69#define TW_FL_BUILTIN	0x04
70#define TW_FL_SORT	0x08
71#define TW_FL_REL	0x10
72
73static struct {				/* Current element pointer	*/
74    int    cur;				/* Current element number	*/
75    Char **pathv;			/* Current element in path	*/
76    DIR   *dfd;				/* Current directory descriptor	*/
77} tw_cmd_state;
78
79
80#ifdef BSDSIGS
81static sigmask_t tw_omask;
82# define TW_HOLD()	tw_omask = sigblock(sigmask(SIGINT))
83# define TW_RELS()	(void) sigsetmask(tw_omask)
84#else /* !BSDSIGS */
85# define TW_HOLD()	(void) sighold(SIGINT)
86# define TW_RELS()	(void) sigrelse(SIGINT)
87#endif /* BSDSIGS */
88
89#define SETDIR(dfd) \
90    { \
91	tw_dir_fd = dfd; \
92	if (tw_dir_fd != NULL) \
93	    rewinddir(tw_dir_fd); \
94    }
95
96#define CLRDIR(dfd) \
97    if (dfd != NULL) { \
98	TW_HOLD(); \
99	(void) closedir(dfd); \
100	dfd = NULL; \
101	TW_RELS(); \
102    }
103
104static Char	*tw_str_add		__P((stringlist_t *, int));
105static void	 tw_str_free		__P((stringlist_t *));
106static Char     *tw_dir_next		__P((DIR *));
107static void	 tw_cmd_add 		__P((const Char *name));
108static void 	 tw_cmd_cmd		__P((void));
109static void	 tw_cmd_builtin		__P((void));
110static void	 tw_cmd_alias		__P((void));
111static void	 tw_cmd_sort		__P((void));
112static void 	 tw_vptr_start		__P((struct varent *));
113
114
115/* tw_str_add():
116 *	Add an item to the string list
117 */
118static Char *
119tw_str_add(sl, len)
120    stringlist_t *sl;
121    int len;
122{
123    Char *ptr;
124
125    if (sl->tlist <= sl->nlist) {
126	TW_HOLD();
127	sl->tlist += TW_INCR;
128	sl->list = sl->list ?
129		    (Char **) xrealloc((ptr_t) sl->list,
130				       (size_t) (sl->tlist * sizeof(Char *))) :
131		    (Char **) xmalloc((size_t) (sl->tlist * sizeof(Char *)));
132	TW_RELS();
133    }
134    if (sl->tbuff <= sl->nbuff + len) {
135	int i;
136	ptr = sl->buff;
137
138	TW_HOLD();
139	sl->tbuff += TW_INCR + len;
140	sl->buff = sl->buff ?
141		    (Char *) xrealloc((ptr_t) sl->buff,
142				      (size_t) (sl->tbuff * sizeof(Char))) :
143		    (Char *) xmalloc((size_t) (sl->tbuff * sizeof(Char)));
144	/* Re-thread the new pointer list, if changed */
145	if (ptr != NULL && ptr != sl->buff) {
146	    intptr_t offs = sl->buff - ptr;
147	    for (i = 0; i < sl->nlist; i++)
148		sl->list[i] += offs;
149	}
150	TW_RELS();
151    }
152    ptr = sl->list[sl->nlist++] = &sl->buff[sl->nbuff];
153    sl->nbuff += len;
154    return ptr;
155} /* tw_str_add */
156
157
158/* tw_str_free():
159 *	Free a stringlist
160 */
161static void
162tw_str_free(sl)
163    stringlist_t *sl;
164{
165    TW_HOLD();
166    if (sl->list) {
167	xfree((ptr_t) sl->list);
168	sl->list = NULL;
169	sl->tlist = sl->nlist = 0;
170    }
171    if (sl->buff) {
172	xfree((ptr_t) sl->buff);
173	sl->buff = NULL;
174	sl->tbuff = sl->nbuff = 0;
175    }
176    TW_RELS();
177} /* end tw_str_free */
178
179
180static Char *
181tw_dir_next(dfd)
182    DIR *dfd;
183{
184    struct dirent *dirp;
185
186    if (dfd == NULL)
187	return NULL;
188
189    if ((dirp = readdir(dfd)) != NULL) {
190	(void) Strcpy(tw_retname, str2short(dirp->d_name));
191	return (tw_retname);
192    }
193    return NULL;
194} /* end tw_dir_next */
195
196
197/* tw_cmd_add():
198 *	Add the name to the command list
199 */
200static void
201tw_cmd_add(name)
202    const Char *name;
203{
204    int len;
205
206    len = (int) Strlen(name) + 2;
207    (void) Strcpy(tw_str_add(&tw_cmd, len), name);
208} /* end tw_cmd_add */
209
210
211/* tw_cmd_free():
212 *	Free the command list
213 */
214void
215tw_cmd_free()
216{
217    CLRDIR(tw_dir_fd)
218    tw_str_free(&tw_cmd);
219    tw_cmd_got = 0;
220} /* end tw_cmd_free */
221
222/* tw_cmd_cmd():
223 *	Add system commands to the command list
224 */
225static void
226tw_cmd_cmd()
227{
228    DIR *dirp;
229    struct dirent *dp;
230    Char *dir = NULL, *name;
231    Char **pv;
232    struct varent *v = adrof(STRpath);
233    struct varent *recexec = adrof(STRrecognize_only_executables);
234    int len;
235
236
237    if (v == NULL || v->vec == NULL) /* if no path */
238	return;
239
240    for (pv = v->vec; *pv; pv++) {
241	if (pv[0][0] != '/') {
242	    tw_cmd_got |= TW_FL_REL;
243	    continue;
244	}
245
246	if ((dirp = opendir(short2str(*pv))) == NULL)
247	    continue;
248
249	if (recexec)
250	    dir = Strspl(*pv, STRslash);
251	while ((dp = readdir(dirp)) != NULL) {
252#if defined(_UWIN) || defined(__CYGWIN__)
253	    /* Turn foo.{exe,com,bat} into foo since UWIN's readdir returns
254	     * the file with the .exe, .com, .bat extension
255	     */
256	    size_t ext = strlen(dp->d_name) - 4;
257	    if ((ext > 0) && (strcmp(&dp->d_name[ext], ".exe") == 0 ||
258		strcmp(&dp->d_name[ext], ".bat") == 0 ||
259		strcmp(&dp->d_name[ext], ".com") == 0))
260		dp->d_name[ext] = '\0';
261#endif /* _UWIN || __CYGWIN__ */
262	    /* the call to executable() may make this a bit slow */
263	    name = str2short(dp->d_name);
264	    if (dp->d_ino == 0 || (recexec && !executable(dir, name, 0)))
265		continue;
266            len = (int) Strlen(name) + 2;
267            if (name[0] == '#' ||	/* emacs temp files	*/
268		name[0] == '.' ||	/* .files		*/
269		name[len - 3] == '~' ||	/* emacs backups	*/
270		name[len - 3] == '%')	/* textedit backups	*/
271                continue;		/* Ignore!		*/
272            tw_cmd_add(name);
273	}
274	(void) closedir(dirp);
275	if (recexec)
276	    xfree((ptr_t) dir);
277    }
278} /* end tw_cmd_cmd */
279
280
281/* tw_cmd_builtin():
282 *	Add builtins to the command list
283 */
284static void
285tw_cmd_builtin()
286{
287    struct biltins *bptr;
288
289    for (bptr = bfunc; bptr < &bfunc[nbfunc]; bptr++)
290	if (bptr->bname)
291	    tw_cmd_add(str2short(bptr->bname));
292#ifdef WINNT_NATIVE
293    for (bptr = nt_bfunc; bptr < &nt_bfunc[nt_nbfunc]; bptr++)
294	if (bptr->bname)
295	    tw_cmd_add(str2short(bptr->bname));
296#endif /* WINNT_NATIVE*/
297} /* end tw_cmd_builtin */
298
299
300/* tw_cmd_alias():
301 *	Add aliases to the command list
302 */
303static void
304tw_cmd_alias()
305{
306    struct varent *p;
307    struct varent *c;
308
309    p = &aliases;
310    for (;;) {
311	while (p->v_left)
312	    p = p->v_left;
313x:
314	if (p->v_parent == 0) /* is it the header? */
315	    return;
316	if (p->v_name)
317	    tw_cmd_add(p->v_name);
318	if (p->v_right) {
319	    p = p->v_right;
320	    continue;
321	}
322	do {
323	    c = p;
324	    p = p->v_parent;
325	} while (p->v_right == c);
326	goto x;
327    }
328} /* end tw_cmd_alias */
329
330
331/* tw_cmd_sort():
332 *	Sort the command list removing duplicate elements
333 */
334static void
335tw_cmd_sort()
336{
337    int fwd, i;
338
339    TW_HOLD();
340    /* sort the list. */
341    qsort((ptr_t) tw_cmd.list, (size_t) tw_cmd.nlist, sizeof(Char *),
342	  (int (*) __P((const void *, const void *))) fcompare);
343
344    /* get rid of multiple entries */
345    for (i = 0, fwd = 0; i < tw_cmd.nlist - 1; i++) {
346	if (Strcmp(tw_cmd.list[i], tw_cmd.list[i + 1]) == 0) /* garbage */
347	    fwd++;		/* increase the forward ref. count */
348	else if (fwd)
349	    tw_cmd.list[i - fwd] = tw_cmd.list[i];
350    }
351    /* Fix fencepost error -- Theodore Ts'o <tytso@athena.mit.edu> */
352    if (fwd)
353	tw_cmd.list[i - fwd] = tw_cmd.list[i];
354    tw_cmd.nlist -= fwd;
355    TW_RELS();
356} /* end tw_cmd_sort */
357
358
359/* tw_cmd_start():
360 *	Get the command list and sort it, if not done yet.
361 *	Reset the current pointer to the beginning of the command list
362 */
363/*ARGSUSED*/
364void
365tw_cmd_start(dfd, pat)
366    DIR *dfd;
367    Char *pat;
368{
369    static Char *defpath[] = { STRNULL, 0 };
370    USE(pat);
371    SETDIR(dfd)
372    if ((tw_cmd_got & TW_FL_CMD) == 0) {
373	tw_cmd_free();
374	tw_cmd_cmd();
375	tw_cmd_got |= TW_FL_CMD;
376    }
377    if ((tw_cmd_got & TW_FL_ALIAS) == 0) {
378	tw_cmd_alias();
379	tw_cmd_got &= ~TW_FL_SORT;
380	tw_cmd_got |= TW_FL_ALIAS;
381    }
382    if ((tw_cmd_got & TW_FL_BUILTIN) == 0) {
383	tw_cmd_builtin();
384	tw_cmd_got &= ~TW_FL_SORT;
385	tw_cmd_got |= TW_FL_BUILTIN;
386    }
387    if ((tw_cmd_got & TW_FL_SORT) == 0) {
388	tw_cmd_sort();
389	tw_cmd_got |= TW_FL_SORT;
390    }
391
392    tw_cmd_state.cur = 0;
393    CLRDIR(tw_cmd_state.dfd)
394    if (tw_cmd_got & TW_FL_REL) {
395	struct varent *vp = adrof(STRpath);
396	if (vp && vp->vec)
397	    tw_cmd_state.pathv = vp->vec;
398	else
399	    tw_cmd_state.pathv = defpath;
400    }
401    else
402	tw_cmd_state.pathv = defpath;
403} /* tw_cmd_start */
404
405
406/* tw_cmd_next():
407 *	Return the next element in the command list or
408 *	Look for commands in the relative path components
409 */
410Char *
411tw_cmd_next(dir, flags)
412    Char *dir;
413    int  *flags;
414{
415    Char *ptr = NULL;
416
417    if (tw_cmd_state.cur < tw_cmd.nlist) {
418	*flags = TW_DIR_OK;
419	return tw_cmd.list[tw_cmd_state.cur++];
420    }
421
422    /*
423     * We need to process relatives in the path.
424     */
425    while (((tw_cmd_state.dfd == NULL) ||
426	    ((ptr = tw_dir_next(tw_cmd_state.dfd)) == NULL)) &&
427	   (*tw_cmd_state.pathv != NULL)) {
428
429        CLRDIR(tw_cmd_state.dfd)
430
431	while (*tw_cmd_state.pathv && tw_cmd_state.pathv[0][0] == '/')
432	    tw_cmd_state.pathv++;
433	if ((ptr = *tw_cmd_state.pathv) != 0) {
434	    /*
435	     * We complete directories only on '.' should that
436	     * be changed?
437	     */
438	    if (ptr[0] == '\0' || (ptr[0] == '.' && ptr[1] == '\0')) {
439		*dir = '\0';
440		tw_cmd_state.dfd = opendir(".");
441		*flags = TW_DIR_OK | TW_EXEC_CHK;
442	    }
443	    else {
444		copyn(dir, *tw_cmd_state.pathv, FILSIZ);
445		catn(dir, STRslash, FILSIZ);
446		tw_cmd_state.dfd = opendir(short2str(*tw_cmd_state.pathv));
447		*flags = TW_EXEC_CHK;
448	    }
449	    tw_cmd_state.pathv++;
450	}
451    }
452    return ptr;
453} /* end tw_cmd_next */
454
455
456/* tw_vptr_start():
457 *	Find the first variable in the variable list
458 */
459static void
460tw_vptr_start(c)
461    struct varent *c;
462{
463    tw_vptr = c;		/* start at beginning of variable list */
464
465    for (;;) {
466	while (tw_vptr->v_left)
467	    tw_vptr = tw_vptr->v_left;
468x:
469	if (tw_vptr->v_parent == 0) {	/* is it the header? */
470	    tw_vptr = NULL;
471	    return;
472	}
473	if (tw_vptr->v_name)
474	    return;		/* found first one */
475	if (tw_vptr->v_right) {
476	    tw_vptr = tw_vptr->v_right;
477	    continue;
478	}
479	do {
480	    c = tw_vptr;
481	    tw_vptr = tw_vptr->v_parent;
482	} while (tw_vptr->v_right == c);
483	goto x;
484    }
485} /* end tw_shvar_start */
486
487
488/* tw_shvar_next():
489 *	Return the next shell variable
490 */
491/*ARGSUSED*/
492Char *
493tw_shvar_next(dir, flags)
494    Char *dir;
495    int	 *flags;
496{
497    struct varent *p;
498    struct varent *c;
499    Char *cp;
500
501    USE(flags);
502    USE(dir);
503    if ((p = tw_vptr) == NULL)
504	return (NULL);		/* just in case */
505
506    cp = p->v_name;		/* we know that this name is here now */
507
508    /* now find the next one */
509    for (;;) {
510	if (p->v_right) {	/* if we can go right */
511	    p = p->v_right;
512	    while (p->v_left)
513		p = p->v_left;
514	}
515	else {			/* else go up */
516	    do {
517		c = p;
518		p = p->v_parent;
519	    } while (p->v_right == c);
520	}
521	if (p->v_parent == 0) {	/* is it the header? */
522	    tw_vptr = NULL;
523	    return (cp);
524	}
525	if (p->v_name) {
526	    tw_vptr = p;	/* save state for the next call */
527	    return (cp);
528	}
529    }
530} /* end tw_shvar_next */
531
532
533/* tw_envvar_next():
534 *	Return the next environment variable
535 */
536/*ARGSUSED*/
537Char *
538tw_envvar_next(dir, flags)
539    Char *dir;
540    int *flags;
541{
542    Char   *ps, *pd;
543
544    USE(flags);
545    USE(dir);
546    if (tw_env == NULL || *tw_env == NULL)
547	return (NULL);
548    for (ps = *tw_env, pd = tw_retname;
549	 *ps && *ps != '=' && pd <= &tw_retname[MAXPATHLEN]; *pd++ = *ps++)
550	continue;
551    *pd = '\0';
552    tw_env++;
553    return (tw_retname);
554} /* end tw_envvar_next */
555
556
557/* tw_var_start():
558 *	Begin the list of the shell and environment variables
559 */
560/*ARGSUSED*/
561void
562tw_var_start(dfd, pat)
563    DIR *dfd;
564    Char *pat;
565{
566    USE(pat);
567    SETDIR(dfd)
568    tw_vptr_start(&shvhed);
569    tw_env = STR_environ;
570} /* end tw_var_start */
571
572
573/* tw_alias_start():
574 *	Begin the list of the shell aliases
575 */
576/*ARGSUSED*/
577void
578tw_alias_start(dfd, pat)
579    DIR *dfd;
580    Char *pat;
581{
582    USE(pat);
583    SETDIR(dfd)
584    tw_vptr_start(&aliases);
585    tw_env = NULL;
586} /* tw_alias_start */
587
588
589/* tw_complete_start():
590 *	Begin the list of completions
591 */
592/*ARGSUSED*/
593void
594tw_complete_start(dfd, pat)
595    DIR *dfd;
596    Char *pat;
597{
598    USE(pat);
599    SETDIR(dfd)
600    tw_vptr_start(&completions);
601    tw_env = NULL;
602} /* end tw_complete_start */
603
604
605/* tw_var_next():
606 *	Return the next shell or environment variable
607 */
608Char *
609tw_var_next(dir, flags)
610    Char *dir;
611    int  *flags;
612{
613    Char *ptr = NULL;
614
615    if (tw_vptr)
616	ptr = tw_shvar_next(dir, flags);
617    if (!ptr && tw_env)
618	ptr = tw_envvar_next(dir, flags);
619    return ptr;
620} /* end tw_var_next */
621
622
623/* tw_logname_start():
624 *	Initialize lognames to the beginning of the list
625 */
626/*ARGSUSED*/
627void
628tw_logname_start(dfd, pat)
629    DIR *dfd;
630    Char *pat;
631{
632    USE(pat);
633    SETDIR(dfd)
634#ifdef HAVE_GETPWENT
635    (void) setpwent();	/* Open passwd file */
636#endif
637} /* end tw_logname_start */
638
639
640/* tw_logname_next():
641 *	Return the next entry from the passwd file
642 */
643/*ARGSUSED*/
644Char *
645tw_logname_next(dir, flags)
646    Char *dir;
647    int  *flags;
648{
649    static Char retname[MAXPATHLEN];
650    struct passwd *pw;
651    /*
652     * We don't want to get interrupted inside getpwent()
653     * because the yellow pages code is not interruptible,
654     * and if we call endpwent() immediatetely after
655     * (in pintr()) we may be freeing an invalid pointer
656     */
657    USE(flags);
658    USE(dir);
659    TW_HOLD();
660#ifdef HAVE_GETPWENT
661    pw = getpwent();
662#else
663    pw = NULL;
664#endif
665    TW_RELS();
666
667    if (pw == NULL) {
668#ifdef YPBUGS
669	fix_yp_bugs();
670#endif
671	return (NULL);
672    }
673    (void) Strcpy(retname, str2short(pw->pw_name));
674    return (retname);
675} /* end tw_logname_next */
676
677
678/* tw_logname_end():
679 *	Close the passwd file to finish the logname list
680 */
681void
682tw_logname_end()
683{
684#ifdef YPBUGS
685    fix_yp_bugs();
686#endif
687#ifdef HAVE_GETPWENT
688   (void) endpwent();
689#endif
690} /* end tw_logname_end */
691
692
693/* tw_grpname_start():
694 *	Initialize grpnames to the beginning of the list
695 */
696/*ARGSUSED*/
697void
698tw_grpname_start(dfd, pat)
699    DIR *dfd;
700    Char *pat;
701{
702    USE(pat);
703    SETDIR(dfd)
704#if !defined(_VMS_POSIX) && !defined(_OSD_POSIX) && !defined(WINNT_NATIVE)
705    (void) setgrent();	/* Open group file */
706#endif /* !_VMS_POSIX && !_OSD_POSIX && !WINNT_NATIVE */
707} /* end tw_grpname_start */
708
709
710/* tw_grpname_next():
711 *	Return the next entry from the group file
712 */
713/*ARGSUSED*/
714Char *
715tw_grpname_next(dir, flags)
716    Char *dir;
717    int  *flags;
718{
719    static Char retname[MAXPATHLEN];
720    struct group *gr;
721    /*
722     * We don't want to get interrupted inside getgrent()
723     * because the yellow pages code is not interruptible,
724     * and if we call endgrent() immediatetely after
725     * (in pintr()) we may be freeing an invalid pointer
726     */
727    USE(flags);
728    USE(dir);
729    TW_HOLD();
730#if !defined(_VMS_POSIX) && !defined(_OSD_POSIX) && !defined(WINNT_NATIVE)
731    gr = (struct group *) getgrent();
732#else /* _VMS_POSIX || _OSD_POSIX || WINNT_NATIVE */
733    gr = NULL;
734#endif /* !_VMS_POSIX && !_OSD_POSIX && !WINNT_NATIVE */
735    TW_RELS();
736
737    if (gr == NULL) {
738#ifdef YPBUGS
739	fix_yp_bugs();
740#endif
741	return (NULL);
742    }
743    (void) Strcpy(retname, str2short(gr->gr_name));
744    return (retname);
745} /* end tw_grpname_next */
746
747
748/* tw_grpname_end():
749 *	Close the group file to finish the groupname list
750 */
751void
752tw_grpname_end()
753{
754#ifdef YPBUGS
755    fix_yp_bugs();
756#endif
757#if !defined(_VMS_POSIX) && !defined(_OSD_POSIX) && !defined(WINNT_NATIVE)
758   (void) endgrent();
759#endif /* !_VMS_POSIX && !_OSD_POSIX && !WINNT_NATIVE */
760} /* end tw_grpname_end */
761
762/* tw_file_start():
763 *	Initialize the directory for the file list
764 */
765/*ARGSUSED*/
766void
767tw_file_start(dfd, pat)
768    DIR *dfd;
769    Char *pat;
770{
771    struct varent *vp;
772    USE(pat);
773    SETDIR(dfd)
774    if ((vp = adrof(STRcdpath)) != NULL)
775	tw_env = vp->vec;
776} /* end tw_file_start */
777
778
779/* tw_file_next():
780 *	Return the next file in the directory
781 */
782Char *
783tw_file_next(dir, flags)
784    Char *dir;
785    int  *flags;
786{
787    Char *ptr = tw_dir_next(tw_dir_fd);
788    if (ptr == NULL && (*flags & TW_DIR_OK) != 0) {
789	CLRDIR(tw_dir_fd)
790	while (tw_env && *tw_env)
791	    if ((tw_dir_fd = opendir(short2str(*tw_env))) != NULL)
792		break;
793	    else
794		tw_env++;
795
796	if (tw_dir_fd) {
797	    copyn(dir, *tw_env++, MAXPATHLEN);
798	    catn(dir, STRslash, MAXPATHLEN);
799	    ptr = tw_dir_next(tw_dir_fd);
800	}
801    }
802    return ptr;
803} /* end tw_file_next */
804
805
806/* tw_dir_end():
807 *	Clear directory related lists
808 */
809void
810tw_dir_end()
811{
812   CLRDIR(tw_dir_fd)
813   CLRDIR(tw_cmd_state.dfd)
814} /* end tw_dir_end */
815
816
817/* tw_item_free():
818 *	Free the item list
819 */
820void
821tw_item_free()
822{
823    tw_str_free(&tw_item);
824} /* end tw_item_free */
825
826
827/* tw_item_get():
828 *	Return the list of items
829 */
830Char **
831tw_item_get()
832{
833    return tw_item.list;
834} /* end tw_item_get */
835
836
837/* tw_item_add():
838 *	Return a new item
839 */
840Char *
841tw_item_add(len)
842    int len;
843{
844     return tw_str_add(&tw_item, len);
845} /* tw_item_add */
846
847
848/* tw_item_find():
849 *      Find the string if it exists in the item list
850 *	end return it.
851 */
852Char *
853tw_item_find(str)
854    Char    *str;
855{
856    int i;
857
858    if (tw_item.list == NULL || str == NULL)
859	return NULL;
860
861    for (i = 0; i < tw_item.nlist; i++)
862	if (tw_item.list[i] != NULL && Strcmp(tw_item.list[i], str) == 0)
863	    return tw_item.list[i];
864    return NULL;
865} /* end tw_item_find */
866
867
868/* tw_vl_start():
869 *	Initialize a variable list
870 */
871void
872tw_vl_start(dfd, pat)
873    DIR *dfd;
874    Char *pat;
875{
876    SETDIR(dfd)
877    if ((tw_vptr = adrof(pat)) != NULL) {
878	tw_env = tw_vptr->vec;
879	tw_vptr = NULL;
880    }
881    else
882	tw_env = NULL;
883} /* end tw_vl_start */
884
885
886/*
887 * Initialize a word list
888 */
889void
890tw_wl_start(dfd, pat)
891    DIR *dfd;
892    Char *pat;
893{
894    SETDIR(dfd);
895    tw_word = pat;
896} /* end tw_wl_start */
897
898
899/*
900 * Return the next word from the word list
901 */
902/*ARGSUSED*/
903Char *
904tw_wl_next(dir, flags)
905    Char *dir;
906    int *flags;
907{
908    USE(flags);
909    if (tw_word == NULL || tw_word[0] == '\0')
910	return NULL;
911
912    while (*tw_word && Isspace(*tw_word)) tw_word++;
913
914    for (dir = tw_word; *tw_word && !Isspace(*tw_word); tw_word++)
915	continue;
916    if (*tw_word)
917	*tw_word++ = '\0';
918    return *dir ? dir : NULL;
919} /* end tw_wl_next */
920
921
922/* tw_bind_start():
923 *	Begin the list of the shell bindings
924 */
925/*ARGSUSED*/
926void
927tw_bind_start(dfd, pat)
928    DIR *dfd;
929    Char *pat;
930{
931    USE(pat);
932    SETDIR(dfd)
933    tw_bind = FuncNames;
934} /* end tw_bind_start */
935
936
937/* tw_bind_next():
938 *	Begin the list of the shell bindings
939 */
940/*ARGSUSED*/
941Char *
942tw_bind_next(dir, flags)
943    Char *dir;
944    int *flags;
945{
946    const char *ptr;
947    USE(flags);
948    if (tw_bind && tw_bind->name) {
949	for (ptr = tw_bind->name, dir = tw_retname;
950	     (*dir++ = (Char) *ptr++) != '\0';)
951	    continue;
952	tw_bind++;
953	return(tw_retname);
954    }
955    return NULL;
956} /* end tw_bind_next */
957
958
959/* tw_limit_start():
960 *	Begin the list of the shell limitings
961 */
962/*ARGSUSED*/
963void
964tw_limit_start(dfd, pat)
965    DIR *dfd;
966    Char *pat;
967{
968    USE(pat);
969    SETDIR(dfd)
970#ifndef HAVENOLIMIT
971    tw_limit = limits;
972#endif /* ! HAVENOLIMIT */
973} /* end tw_limit_start */
974
975
976/* tw_limit_next():
977 *	Begin the list of the shell limitings
978 */
979/*ARGSUSED*/
980Char *
981tw_limit_next(dir, flags)
982    Char *dir;
983    int *flags;
984{
985#ifndef HAVENOLIMIT
986    const char *ptr;
987    if (tw_limit && tw_limit->limname) {
988	for (ptr = tw_limit->limname, dir = tw_retname;
989	     (*dir++ = (Char) *ptr++) != '\0';)
990	    continue;
991	tw_limit++;
992	return(tw_retname);
993    }
994#endif /* ! HAVENOLIMIT */
995    USE(flags);
996    return NULL;
997} /* end tw_limit_next */
998
999
1000/* tw_sig_start():
1001 *	Begin the list of the shell sigings
1002 */
1003/*ARGSUSED*/
1004void
1005tw_sig_start(dfd, pat)
1006    DIR *dfd;
1007    Char *pat;
1008{
1009    USE(pat);
1010    SETDIR(dfd)
1011    tw_index = 0;
1012} /* end tw_sig_start */
1013
1014
1015/* tw_sig_next():
1016 *	Begin the list of the shell sigings
1017 */
1018/*ARGSUSED*/
1019Char *
1020tw_sig_next(dir, flags)
1021    Char *dir;
1022    int *flags;
1023{
1024    const char *ptr;
1025    USE(flags);
1026    for (;tw_index < nsig; tw_index++) {
1027
1028	if (mesg[tw_index].iname == NULL)
1029	    continue;
1030
1031	for (ptr = mesg[tw_index].iname, dir = tw_retname;
1032	     (*dir++ = (Char) *ptr++) != '\0';)
1033	    continue;
1034	tw_index++;
1035	return(tw_retname);
1036    }
1037    return NULL;
1038} /* end tw_sig_next */
1039
1040
1041/* tw_job_start():
1042 *	Begin the list of the shell jobings
1043 */
1044/*ARGSUSED*/
1045void
1046tw_job_start(dfd, pat)
1047    DIR *dfd;
1048    Char *pat;
1049{
1050    USE(pat);
1051    SETDIR(dfd)
1052    tw_index = 1;
1053} /* end tw_job_start */
1054
1055
1056/* tw_job_next():
1057 *	Begin the list of the shell jobings
1058 */
1059/*ARGSUSED*/
1060Char *
1061tw_job_next(dir, flags)
1062    Char *dir;
1063    int *flags;
1064{
1065    Char *ptr;
1066    struct process *j;
1067
1068    USE(flags);
1069    for (;tw_index <= pmaxindex; tw_index++) {
1070	for (j = proclist.p_next; j != NULL; j = j->p_next)
1071	    if (j->p_index == tw_index && j->p_procid == j->p_jobid)
1072		break;
1073	if (j == NULL)
1074	    continue;
1075	for (ptr = j->p_command, dir = tw_retname; (*dir++ = *ptr++) != '\0';)
1076	    continue;
1077	*dir = '\0';
1078	tw_index++;
1079	return(tw_retname);
1080    }
1081    return NULL;
1082} /* end tw_job_next */
1083