[unix-history] / usr / src / bin / csh / dir.c

static	char *sccsid = "@(#)dir.c 4.1 %G%";

#include "sh.h"
#include "sh.dir.h"

/*
 * C Shell - directory management
 */

struct	directory *dfind();
char	*dfollow();
struct	directory dhead;		/* "head" of loop */
int	printd;				/* force name to be printed */
static	char *fakev[] = { "dirs", NOSTR };

/*
 * dinit - initialize current working directory
 */
dinit(hp)
	char *hp;
{
	register char *cp;
	register struct directory *dp;
	char path[BUFSIZ];

	if (loginsh && hp)
		cp = hp;
	else
		cp = getwd(path);
	dp = (struct directory *)calloc(sizeof (struct directory), 1);
	dp->di_name = savestr(cp);
	dp->di_count = 0;
	dhead.di_next = dhead.di_prev = dp;
	dp->di_next = dp->di_prev = &dhead;
	printd = 0;
	dnewcwd(dp);
}

/*
 * dodirs - list all directories in directory loop
 */
dodirs(v)
	char **v;
{
	register struct directory *dp;
	bool lflag;
	char *hp = value("home");

	if (*hp == '\0')
		hp = NOSTR;
	if (*++v != NOSTR)
		if (eq(*v, "-l") && *++v == NOSTR)
			lflag = 1;
		else
			error("Usage: dirs [ -l ]");
	else
		lflag = 0;
	dp = dcwd;
	do {
		if (dp == &dhead)
			continue;
		if (!lflag && hp != NOSTR) {
			dtildepr(hp, dp->di_name);
		} else
			printf("%s", dp->di_name);
		printf(" ");
	} while ((dp = dp->di_prev) != dcwd);
	printf("\n");
}

dtildepr(home, dir)
	register char *home, *dir;
{

	if (!eq(home, "/") && prefix(home, dir))
		printf("~%s", dir + strlen(home));
	else
		printf("%s", dir);
}

/*
 * dochngd - implement chdir command.
 */
dochngd(v)
	char **v;
{
	register char *cp;
	register struct directory *dp;

	printd = 0;
	if (*++v == NOSTR) {
		if ((cp = value("home")) == NOSTR || *cp == 0)
			bferr("No home directory");
		if (chdir(cp) < 0)
			bferr("Can't change to home directory");
		cp = savestr(cp);
	} else if ((dp = dfind(*v)) != 0) {
		printd = 1;
		if (chdir(dp->di_name) < 0)
			Perror(dp->di_name);
		dcwd->di_prev->di_next = dcwd->di_next;
		dcwd->di_next->di_prev = dcwd->di_prev;
		goto flushcwd;
	} else
		cp = dfollow(*v);
	dp = (struct directory *)calloc(sizeof (struct directory), 1);
	dp->di_name = cp;
	dp->di_count = 0;
	dp->di_next = dcwd->di_next;
	dp->di_prev = dcwd->di_prev;
	dp->di_prev->di_next = dp;
	dp->di_next->di_prev = dp;
flushcwd:
	dfree(dcwd);
	dnewcwd(dp);
}

/*
 * dfollow - change to arg directory; fall back on cdpath if not valid
 */
char *
dfollow(cp)
	register char *cp;
{
	register char **cdp;
	struct varent *c;
	
	cp = globone(cp);
	if (chdir(cp) == 0)
		goto gotcha;
	if (cp[0] != '/' && !prefix("./", cp) && !prefix("../", cp)
	    && (c = adrof("cdpath"))) {
		for (cdp = c->vec; *cdp; cdp++) {
			char buf[BUFSIZ];

			strcpy(buf, *cdp);
			strcat(buf, "/");
			strcat(buf, cp);
			if (chdir(buf) >= 0) {
				printd = 1;
				xfree(cp);
				cp = savestr(buf);
				goto gotcha;
			}
		}
	}
	if (adrof(cp)) {
		char *dp = value(cp);

		if (dp[0] == '/' || dp[0] == '.')
			if (chdir(dp) >= 0) {
				xfree(cp);
				cp = savestr(dp);
				printd = 1;
				goto gotcha;
			}
	}
	xfree(cp);
	Perror(cp);

gotcha:
	if (*cp != '/') {
		char *dp = calloc(strlen(cp) + strlen(dcwd->di_name) + 2, 1);
		strcpy(dp, dcwd->di_name);
		strcat(dp, "/");
		strcat(dp, cp);
		xfree(cp);
		cp = dp;
	}
	dcanon(cp);
	return (cp);
}

/*
 * dopushd - push new directory onto directory stack.
 *	with no arguments exchange top and second.
 *	with numeric argument (+n) bring it to top.
 */
dopushd(v)
	char **v;
{
	register struct directory *dp;

	printd = 1;
	if (*++v == NOSTR) {
		if ((dp = dcwd->di_prev) == &dhead)
			dp = dhead.di_prev;
		if (dp == dcwd)
			bferr("No other directory");
		if (chdir(dp->di_name) < 0)
			Perror(dp->di_name);
		dp->di_prev->di_next = dp->di_next;
		dp->di_next->di_prev = dp->di_prev;
		dp->di_next = dcwd->di_next;
		dp->di_prev = dcwd;
		dcwd->di_next->di_prev = dp;
		dcwd->di_next = dp;
	} else if (dp = dfind(*v)) {
		if (chdir(dp->di_name) < 0)
			Perror(dp->di_name);
	} else {
		register char *cp;

		cp = dfollow(*v);
		dp = (struct directory *)calloc(sizeof (struct directory), 1);
		dp->di_name = cp;
		dp->di_count = 0;
		dp->di_prev = dcwd;
		dp->di_next = dcwd->di_next;
		dcwd->di_next = dp;
		dp->di_next->di_prev = dp;
	}
	dnewcwd(dp);
}

/*
 * dfind - find a directory if specified by numeric (+n) argument
 */
struct directory *
dfind(cp)
	register char *cp;
{
	register struct directory *dp;
	register int i;
	register char *ep;

	if (*cp++ != '+')
		return (0);
	for (ep = cp; digit(*ep); ep++)
		continue;
	if (*ep)
		return (0);
	i = getn(cp);
	if (i <= 0)
		return (0);
	for (dp = dcwd; i != 0; i--) {
		if ((dp = dp->di_prev) == &dhead)
			dp = dp->di_prev;
		if (dp == dcwd)
			bferr("Directory stack not that deep");
	}
	return (dp);
}

/*
 * dopopd - pop a directory out of the directory stack
 *	with a numeric argument just discard it.
 */
dopopd(v)
	char **v;
{
	register struct directory *dp, *p;

	printd = 1;
	if (*++v == NOSTR)
		dp = dcwd;
	else if ((dp = dfind(*v)) == 0)
		bferr("Bad directory");
	if (dp->di_prev == &dhead && dp->di_next == &dhead)
		bferr("Directory stack empty");
	if (dp == dcwd) {
		if ((p = dp->di_prev) == &dhead)
			p = dhead.di_prev;
		if (chdir(p->di_name) < 0)
			Perror(p->di_name);
	}
	dp->di_prev->di_next = dp->di_next;
	dp->di_next->di_prev = dp->di_prev;
	if (dp == dcwd)
		dnewcwd(p);
	else
		dodirs(fakev);
	dfree(dp);
}

/*
 * dfree - free the directory (or keep it if it still has ref count)
 */
dfree(dp)
	register struct directory *dp;
{

	if (dp->di_count != 0)
		dp->di_next = dp->di_prev = 0;
	else
		xfree(dp->di_name), xfree((char *)dp);
}

/*
 * dcanon - canonicalize the pathname, removing excess ./ and ../ etc.
 *	we are of course assuming that the file system is standardly
 *	constructed (always have ..'s, directories have links)
 */
dcanon(cp)
	char *cp;
{
	register char *p, *sp;
	register bool slash;

	if (*cp != '/')
		abort();
	for (p = cp; *p; ) {		/* for each component */
		sp = p;			/* save slash address */
		while(*++p == '/')	/* flush extra slashes */
			;
		if (p != ++sp)
			strcpy(sp, p);
		p = sp;			/* save start of component */
		slash = 0;
		while(*++p)		/* find next slash or end of path */
			if (*p == '/') {
				slash = 1;
				*p = 0;
				break;
			}
		if (*sp == '\0')	/* if component is null */
			if (--sp == cp)	/* if path is one char (i.e. /) */
				break;
			else
				*sp = '\0';
		else if (eq(".", sp)) {
			if (slash) {
				strcpy(sp, ++p);
				p = --sp;
			} else if (--sp != cp)
				*sp = '\0';
		} else if (eq("..", sp)) {
			if (--sp != cp)
				while (*--sp != '/')
					;
			if (slash) {
				strcpy(++sp, ++p);
				p = --sp;
			} else if (cp == sp)
				*++sp = '\0';
			else
				*sp = '\0';
		} else if (slash)
			*p = '/';
	}
}

/*
 * dnewcwd - make a new directory in the loop the current one
 */
dnewcwd(dp)
	register struct directory *dp;
{

	dcwd = dp;
	set("cwd", savestr(dcwd->di_name));
	if (printd)
		dodirs(fakev);
}
Commit	Line	Data
106427f7 BJ	1	static char *sccsid = "@(#)dir.c 4.1 %G%";
	2
	3	#include "sh.h"
	4	#include "sh.dir.h"
	5
	6	/*
	7	* C Shell - directory management
	8	*/
	9
	10	struct directory *dfind();
	11	char *dfollow();
	12	struct directory dhead; /* "head" of loop */
	13	int printd; /* force name to be printed */
	14	static char *fakev[] = { "dirs", NOSTR };
	15
	16	/*
	17	* dinit - initialize current working directory
	18	*/
	19	dinit(hp)
	20	char *hp;
	21	{
	22	register char *cp;
	23	register struct directory *dp;
	24	char path[BUFSIZ];
	25
	26	if (loginsh && hp)
	27	cp = hp;
	28	else
	29	cp = getwd(path);
	30	dp = (struct directory *)calloc(sizeof (struct directory), 1);
	31	dp->di_name = savestr(cp);
	32	dp->di_count = 0;
	33	dhead.di_next = dhead.di_prev = dp;
	34	dp->di_next = dp->di_prev = &dhead;
	35	printd = 0;
	36	dnewcwd(dp);
	37	}
	38
	39	/*
	40	* dodirs - list all directories in directory loop
	41	*/
	42	dodirs(v)
	43	char **v;
	44	{
	45	register struct directory *dp;
	46	bool lflag;
	47	char *hp = value("home");
	48
	49	if (*hp == '\0')
	50	hp = NOSTR;
	51	if (*++v != NOSTR)
	52	if (eq(v, "-l") && ++v == NOSTR)
	53	lflag = 1;
	54	else
	55	error("Usage: dirs [ -l ]");
	56	else
	57	lflag = 0;
	58	dp = dcwd;
	59	do {
	60	if (dp == &dhead)
	61	continue;
	62	if (!lflag && hp != NOSTR) {
	63	dtildepr(hp, dp->di_name);
	64	} else
65	printf("%s", dp->di_name);
66	printf(" ");
67	} while ((dp = dp->di_prev) != dcwd);
68	printf("\n");
69	}
70
71	dtildepr(home, dir)
72	register char home, dir;
73	{
74
75	if (!eq(home, "/") && prefix(home, dir))
76	printf("~%s", dir + strlen(home));
77	else
78	printf("%s", dir);
79	}
80
81	/*
82	* dochngd - implement chdir command.
83	*/
84	dochngd(v)
85	char **v;
86	{
87	register char *cp;
88	register struct directory *dp;
89
90	printd = 0;
91	if (*++v == NOSTR) {
92	if ((cp = value("home")) == NOSTR \|\| *cp == 0)
93	bferr("No home directory");
94	if (chdir(cp) < 0)
95	bferr("Can't change to home directory");
96	cp = savestr(cp);
97	} else if ((dp = dfind(*v)) != 0) {
98	printd = 1;
99	if (chdir(dp->di_name) < 0)
100	Perror(dp->di_name);
101	dcwd->di_prev->di_next = dcwd->di_next;
102	dcwd->di_next->di_prev = dcwd->di_prev;
103	goto flushcwd;
104	} else
105	cp = dfollow(*v);
106	dp = (struct directory *)calloc(sizeof (struct directory), 1);
107	dp->di_name = cp;
108	dp->di_count = 0;
109	dp->di_next = dcwd->di_next;
110	dp->di_prev = dcwd->di_prev;
111	dp->di_prev->di_next = dp;
112	dp->di_next->di_prev = dp;
113	flushcwd:
114	dfree(dcwd);
115	dnewcwd(dp);
116	}
117
118	/*
119	* dfollow - change to arg directory; fall back on cdpath if not valid
120	*/
121	char *
122	dfollow(cp)
123	register char *cp;
124	{
125	register char **cdp;
126	struct varent *c;
127
128	cp = globone(cp);
129	if (chdir(cp) == 0)
130	goto gotcha;
131	if (cp[0] != '/' && !prefix("./", cp) && !prefix("../", cp)
132	&& (c = adrof("cdpath"))) {
133	for (cdp = c->vec; *cdp; cdp++) {
134	char buf[BUFSIZ];
135
136	strcpy(buf, *cdp);
137	strcat(buf, "/");
138	strcat(buf, cp);
139	if (chdir(buf) >= 0) {
140	printd = 1;
141	xfree(cp);
142	cp = savestr(buf);
143	goto gotcha;
144	}
145	}
146	}
147	if (adrof(cp)) {
148	char *dp = value(cp);
149
150	if (dp[0] == '/' \|\| dp[0] == '.')
151	if (chdir(dp) >= 0) {
152	xfree(cp);
153	cp = savestr(dp);
154	printd = 1;
155	goto gotcha;
156	}
157	}
158	xfree(cp);
159	Perror(cp);
160
161	gotcha:
162	if (*cp != '/') {
163	char *dp = calloc(strlen(cp) + strlen(dcwd->di_name) + 2, 1);
164	strcpy(dp, dcwd->di_name);
165	strcat(dp, "/");
166	strcat(dp, cp);
167	xfree(cp);
168	cp = dp;
169	}
170	dcanon(cp);
171	return (cp);
172	}
173
174	/*
175	* dopushd - push new directory onto directory stack.
176	* with no arguments exchange top and second.
177	* with numeric argument (+n) bring it to top.
178	*/
179	dopushd(v)
180	char **v;
181	{
182	register struct directory *dp;
183
184	printd = 1;
185	if (*++v == NOSTR) {
186	if ((dp = dcwd->di_prev) == &dhead)
187	dp = dhead.di_prev;
188	if (dp == dcwd)
189	bferr("No other directory");
190	if (chdir(dp->di_name) < 0)
191	Perror(dp->di_name);
192	dp->di_prev->di_next = dp->di_next;
193	dp->di_next->di_prev = dp->di_prev;
194	dp->di_next = dcwd->di_next;
195	dp->di_prev = dcwd;
196	dcwd->di_next->di_prev = dp;
197	dcwd->di_next = dp;
198	} else if (dp = dfind(*v)) {
199	if (chdir(dp->di_name) < 0)
200	Perror(dp->di_name);
201	} else {
202	register char *cp;
203
204	cp = dfollow(*v);
205	dp = (struct directory *)calloc(sizeof (struct directory), 1);
206	dp->di_name = cp;
207	dp->di_count = 0;
208	dp->di_prev = dcwd;
209	dp->di_next = dcwd->di_next;
210	dcwd->di_next = dp;
211	dp->di_next->di_prev = dp;
212	}
213	dnewcwd(dp);
214	}
215
216	/*
217	* dfind - find a directory if specified by numeric (+n) argument
218	*/
219	struct directory *
220	dfind(cp)
221	register char *cp;
222	{
223	register struct directory *dp;
224	register int i;
225	register char *ep;
226
227	if (*cp++ != '+')
228	return (0);
229	for (ep = cp; digit(*ep); ep++)
230	continue;
231	if (*ep)
232	return (0);
233	i = getn(cp);
234	if (i <= 0)
235	return (0);
236	for (dp = dcwd; i != 0; i--) {
237	if ((dp = dp->di_prev) == &dhead)
238	dp = dp->di_prev;
239	if (dp == dcwd)
240	bferr("Directory stack not that deep");
241	}
242	return (dp);
243	}
244
245	/*
246	* dopopd - pop a directory out of the directory stack
247	* with a numeric argument just discard it.
248	*/
249	dopopd(v)
250	char **v;
251	{
252	register struct directory dp, p;
253
254	printd = 1;
255	if (*++v == NOSTR)
256	dp = dcwd;
257	else if ((dp = dfind(*v)) == 0)
258	bferr("Bad directory");
259	if (dp->di_prev == &dhead && dp->di_next == &dhead)
260	bferr("Directory stack empty");
261	if (dp == dcwd) {
262	if ((p = dp->di_prev) == &dhead)
263	p = dhead.di_prev;
264	if (chdir(p->di_name) < 0)
265	Perror(p->di_name);
266	}
267	dp->di_prev->di_next = dp->di_next;
268	dp->di_next->di_prev = dp->di_prev;
269	if (dp == dcwd)
270	dnewcwd(p);
271	else
272	dodirs(fakev);
273	dfree(dp);
274	}
275
276	/*
277	* dfree - free the directory (or keep it if it still has ref count)
278	*/
279	dfree(dp)
280	register struct directory *dp;
281	{
282
283	if (dp->di_count != 0)
284	dp->di_next = dp->di_prev = 0;
285	else
286	xfree(dp->di_name), xfree((char *)dp);
287	}
288
289	/*
290	* dcanon - canonicalize the pathname, removing excess ./ and ../ etc.
291	* we are of course assuming that the file system is standardly
292	* constructed (always have ..'s, directories have links)
293	*/
294	dcanon(cp)
295	char *cp;
296	{
297	register char p, sp;
298	register bool slash;
299
300	if (*cp != '/')
301	abort();
302	for (p = cp; p; ) { / for each component */
303	sp = p; /* save slash address */
304	while(++p == '/') / flush extra slashes */
305	;
306	if (p != ++sp)
307	strcpy(sp, p);
308	p = sp; /* save start of component */
309	slash = 0;
310	while(++p) / find next slash or end of path */
311	if (*p == '/') {
312	slash = 1;
313	*p = 0;
314	break;
315	}
316	if (sp == '\0') / if component is null */
317	if (--sp == cp) /* if path is one char (i.e. /) */
318	break;
319	else
320	*sp = '\0';
321	else if (eq(".", sp)) {
322	if (slash) {
323	strcpy(sp, ++p);
324	p = --sp;
325	} else if (--sp != cp)
326	*sp = '\0';
327	} else if (eq("..", sp)) {
328	if (--sp != cp)
329	while (*--sp != '/')
330	;
331	if (slash) {
332	strcpy(++sp, ++p);
333	p = --sp;
334	} else if (cp == sp)
335	*++sp = '\0';
336	else
337	*sp = '\0';
338	} else if (slash)
339	*p = '/';
340	}
341	}
342
343	/*
344	* dnewcwd - make a new directory in the loop the current one
345	*/
346	dnewcwd(dp)
347	register struct directory *dp;
348	{
349
350	dcwd = dp;
351	set("cwd", savestr(dcwd->di_name));
352	if (printd)
353	dodirs(fakev);
354	}