[unix-history] / usr / src / usr.bin / ftp / main.c

/*
 * Copyright (c) 1985, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1985, 1989 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)main.c	5.18 (Berkeley) 3/1/91";
#endif /* not lint */

/*
 * FTP User Program -- Command Interface.
 */
#include "ftp_var.h"
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/types.h>

#include <arpa/ftp.h>

#include <signal.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
#include <pwd.h>

uid_t	getuid();
void	intr(), lostpeer();
extern	char *home;
char	*getlogin();

main(argc, argv)
	char *argv[];
{
	register char *cp;
	int top;
	struct passwd *pw = NULL;
	char homedir[MAXPATHLEN];

	sp = getservbyname("ftp", "tcp");
	if (sp == 0) {
		fprintf(stderr, "ftp: ftp/tcp: unknown service\n");
		exit(1);
	}
	doglob = 1;
	interactive = 1;
	autologin = 1;
	argc--, argv++;
	while (argc > 0 && **argv == '-') {
		for (cp = *argv + 1; *cp; cp++)
			switch (*cp) {

			case 'd':
				options |= SO_DEBUG;
				debug++;
				break;
			
			case 'v':
				verbose++;
				break;

			case 't':
				trace++;
				break;

			case 'i':
				interactive = 0;
				break;

			case 'n':
				autologin = 0;
				break;

			case 'g':
				doglob = 0;
				break;

			default:
				fprintf(stdout,
				  "ftp: %c: unknown option\n", *cp);
				exit(1);
			}
		argc--, argv++;
	}
	fromatty = isatty(fileno(stdin));
	if (fromatty)
		verbose++;
	cpend = 0;	/* no pending replies */
	proxy = 0;	/* proxy not active */
	crflag = 1;	/* strip c.r. on ascii gets */
	sendport = -1;	/* not using ports */
	/*
	 * Set up the home directory in case we're globbing.
	 */
	cp = getlogin();
	if (cp != NULL) {
		pw = getpwnam(cp);
	}
	if (pw == NULL)
		pw = getpwuid(getuid());
	if (pw != NULL) {
		home = homedir;
		(void) strcpy(home, pw->pw_dir);
	}
	if (argc > 0) {
		if (setjmp(toplevel))
			exit(0);
		(void) signal(SIGINT, intr);
		(void) signal(SIGPIPE, lostpeer);
		setpeer(argc + 1, argv - 1);
	}
	top = setjmp(toplevel) == 0;
	if (top) {
		(void) signal(SIGINT, intr);
		(void) signal(SIGPIPE, lostpeer);
	}
	for (;;) {
		cmdscanner(top);
		top = 1;
	}
}

void
intr()
{

	longjmp(toplevel, 1);
}

void
lostpeer()
{
	extern FILE *cout;
	extern int data;

	if (connected) {
		if (cout != NULL) {
			(void) shutdown(fileno(cout), 1+1);
			(void) fclose(cout);
			cout = NULL;
		}
		if (data >= 0) {
			(void) shutdown(data, 1+1);
			(void) close(data);
			data = -1;
		}
		connected = 0;
	}
	pswitch(1);
	if (connected) {
		if (cout != NULL) {
			(void) shutdown(fileno(cout), 1+1);
			(void) fclose(cout);
			cout = NULL;
		}
		connected = 0;
	}
	proxflag = 0;
	pswitch(0);
}

/*char *
tail(filename)
	char *filename;
{
	register char *s;
	
	while (*filename) {
		s = rindex(filename, '/');
		if (s == NULL)
			break;
		if (s[1])
			return (s + 1);
		*s = '\0';
	}
	return (filename);
}
*/
/*
 * Command parser.
 */
cmdscanner(top)
	int top;
{
	register struct cmd *c;
	register int l;
	struct cmd *getcmd();
	extern int help();

	if (!top)
		(void) putchar('\n');
	for (;;) {
		if (fromatty) {
			printf("ftp> ");
			(void) fflush(stdout);
		}
		if (fgets(line, sizeof line, stdin) == NULL)
			quit();
		l = strlen(line);
		if (l == 0)
			break;
		if (line[--l] == '\n') {
			if (l == 0)
				break;
			line[l] = '\0';
		} else if (l == sizeof(line) - 2) {
			printf("sorry, input line too long\n");
			while ((l = getchar()) != '\n' && l != EOF)
				/* void */;
			break;
		} /* else it was a line without a newline */
		makeargv();
		if (margc == 0) {
			continue;
		}
		c = getcmd(margv[0]);
		if (c == (struct cmd *)-1) {
			printf("?Ambiguous command\n");
			continue;
		}
		if (c == 0) {
			printf("?Invalid command\n");
			continue;
		}
		if (c->c_conn && !connected) {
			printf("Not connected.\n");
			continue;
		}
		(*c->c_handler)(margc, margv);
		if (bell && c->c_bell)
			(void) putchar('\007');
		if (c->c_handler != help)
			break;
	}
	(void) signal(SIGINT, intr);
	(void) signal(SIGPIPE, lostpeer);
}

struct cmd *
getcmd(name)
	register char *name;
{
	extern struct cmd cmdtab[];
	register char *p, *q;
	register struct cmd *c, *found;
	register int nmatches, longest;

	longest = 0;
	nmatches = 0;
	found = 0;
	for (c = cmdtab; p = c->c_name; c++) {
		for (q = name; *q == *p++; q++)
			if (*q == 0)		/* exact match? */
				return (c);
		if (!*q) {			/* the name was a prefix */
			if (q - name > longest) {
				longest = q - name;
				nmatches = 1;
				found = c;
			} else if (q - name == longest)
				nmatches++;
		}
	}
	if (nmatches > 1)
		return ((struct cmd *)-1);
	return (found);
}

/*
 * Slice a string up into argc/argv.
 */

int slrflag;

makeargv()
{
	char **argp;
	char *slurpstring();

	margc = 0;
	argp = margv;
	stringbase = line;		/* scan from first of buffer */
	argbase = argbuf;		/* store from first of buffer */
	slrflag = 0;
	while (*argp++ = slurpstring())
		margc++;
}

/*
 * Parse string into argbuf;
 * implemented with FSM to
 * handle quoting and strings
 */
char *
slurpstring()
{
	int got_one = 0;
	register char *sb = stringbase;
	register char *ap = argbase;
	char *tmp = argbase;		/* will return this if token found */

	if (*sb == '!' || *sb == '$') {	/* recognize ! as a token for shell */
		switch (slrflag) {	/* and $ as token for macro invoke */
			case 0:
				slrflag++;
				stringbase++;
				return ((*sb == '!') ? "!" : "$");
				/* NOTREACHED */
			case 1:
				slrflag++;
				altarg = stringbase;
				break;
			default:
				break;
		}
	}

S0:
	switch (*sb) {

	case '\0':
		goto OUT;

	case ' ':
	case '\t':
		sb++; goto S0;

	default:
		switch (slrflag) {
			case 0:
				slrflag++;
				break;
			case 1:
				slrflag++;
				altarg = sb;
				break;
			default:
				break;
		}
		goto S1;
	}

S1:
	switch (*sb) {

	case ' ':
	case '\t':
	case '\0':
		goto OUT;	/* end of token */

	case '\\':
		sb++; goto S2;	/* slurp next character */

	case '"':
		sb++; goto S3;	/* slurp quoted string */

	default:
		*ap++ = *sb++;	/* add character to token */
		got_one = 1;
		goto S1;
	}

S2:
	switch (*sb) {

	case '\0':
		goto OUT;

	default:
		*ap++ = *sb++;
		got_one = 1;
		goto S1;
	}

S3:
	switch (*sb) {

	case '\0':
		goto OUT;

	case '"':
		sb++; goto S1;

	default:
		*ap++ = *sb++;
		got_one = 1;
		goto S3;
	}

OUT:
	if (got_one)
		*ap++ = '\0';
	argbase = ap;			/* update storage pointer */
	stringbase = sb;		/* update scan pointer */
	if (got_one) {
		return(tmp);
	}
	switch (slrflag) {
		case 0:
			slrflag++;
			break;
		case 1:
			slrflag++;
			altarg = (char *) 0;
			break;
		default:
			break;
	}
	return((char *)0);
}

#define HELPINDENT (sizeof ("directory"))

/*
 * Help command.
 * Call each command handler with argc == 0 and argv[0] == name.
 */
help(argc, argv)
	int argc;
	char *argv[];
{
	extern struct cmd cmdtab[];
	register struct cmd *c;

	if (argc == 1) {
		register int i, j, w, k;
		int columns, width = 0, lines;
		extern int NCMDS;

		printf("Commands may be abbreviated.  Commands are:\n\n");
		for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
			int len = strlen(c->c_name);

			if (len > width)
				width = len;
		}
		width = (width + 8) &~ 7;
		columns = 80 / width;
		if (columns == 0)
			columns = 1;
		lines = (NCMDS + columns - 1) / columns;
		for (i = 0; i < lines; i++) {
			for (j = 0; j < columns; j++) {
				c = cmdtab + j * lines + i;
				if (c->c_name && (!proxy || c->c_proxy)) {
					printf("%s", c->c_name);
				}
				else if (c->c_name) {
					for (k=0; k < strlen(c->c_name); k++) {
						(void) putchar(' ');
					}
				}
				if (c + lines >= &cmdtab[NCMDS]) {
					printf("\n");
					break;
				}
				w = strlen(c->c_name);
				while (w < width) {
					w = (w + 8) &~ 7;
					(void) putchar('\t');
				}
			}
		}
		return;
	}
	while (--argc > 0) {
		register char *arg;
		arg = *++argv;
		c = getcmd(arg);
		if (c == (struct cmd *)-1)
			printf("?Ambiguous help command %s\n", arg);
		else if (c == (struct cmd *)0)
			printf("?Invalid help command %s\n", arg);
		else
			printf("%-*s\t%s\n", HELPINDENT,
				c->c_name, c->c_help);
	}
}
Commit	Line	Data
f54c1094 WJ	1	/*
	2	* Copyright (c) 1985, 1989 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. 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
	34	#ifndef lint
	35	char copyright[] =
	36	"@(#) Copyright (c) 1985, 1989 Regents of the University of California.\n\
	37	All rights reserved.\n";
	38	#endif /* not lint */
	39
	40	#ifndef lint
	41	static char sccsid[] = "@(#)main.c 5.18 (Berkeley) 3/1/91";
	42	#endif /* not lint */
	43
	44	/*
	45	* FTP User Program -- Command Interface.
	46	*/
	47	#include "ftp_var.h"
	48	#include <sys/socket.h>
	49	#include <sys/ioctl.h>
	50	#include <sys/types.h>
	51
	52	#include <arpa/ftp.h>
	53
	54	#include <signal.h>
	55	#include <stdio.h>
	56	#include <errno.h>
	57	#include <ctype.h>
	58	#include <netdb.h>
	59	#include <pwd.h>
	60
	61	uid_t getuid();
	62	void intr(), lostpeer();
	63	extern char *home;
	64	char *getlogin();
65
66	main(argc, argv)
67	char *argv[];
68	{
69	register char *cp;
70	int top;
71	struct passwd *pw = NULL;
72	char homedir[MAXPATHLEN];
73
74	sp = getservbyname("ftp", "tcp");
75	if (sp == 0) {
76	fprintf(stderr, "ftp: ftp/tcp: unknown service\n");
77	exit(1);
78	}
79	doglob = 1;
80	interactive = 1;
81	autologin = 1;
82	argc--, argv++;
83	while (argc > 0 && **argv == '-') {
84	for (cp = argv + 1; cp; cp++)
85	switch (*cp) {
86
87	case 'd':
88	options \|= SO_DEBUG;
89	debug++;
90	break;
91
92	case 'v':
93	verbose++;
94	break;
95
96	case 't':
97	trace++;
98	break;
99
100	case 'i':
101	interactive = 0;
102	break;
103
104	case 'n':
105	autologin = 0;
106	break;
107
108	case 'g':
109	doglob = 0;
110	break;
111
112	default:
113	fprintf(stdout,
114	"ftp: %c: unknown option\n", *cp);
115	exit(1);
116	}
117	argc--, argv++;
118	}
119	fromatty = isatty(fileno(stdin));
120	if (fromatty)
121	verbose++;
122	cpend = 0; /* no pending replies */
123	proxy = 0; /* proxy not active */
124	crflag = 1; /* strip c.r. on ascii gets */
125	sendport = -1; /* not using ports */
126	/*
127	* Set up the home directory in case we're globbing.
128	*/
129	cp = getlogin();
130	if (cp != NULL) {
131	pw = getpwnam(cp);
132	}
133	if (pw == NULL)
134	pw = getpwuid(getuid());
135	if (pw != NULL) {
136	home = homedir;
137	(void) strcpy(home, pw->pw_dir);
138	}
139	if (argc > 0) {
140	if (setjmp(toplevel))
141	exit(0);
142	(void) signal(SIGINT, intr);
143	(void) signal(SIGPIPE, lostpeer);
144	setpeer(argc + 1, argv - 1);
145	}
146	top = setjmp(toplevel) == 0;
147	if (top) {
148	(void) signal(SIGINT, intr);
149	(void) signal(SIGPIPE, lostpeer);
150	}
151	for (;;) {
152	cmdscanner(top);
153	top = 1;
154	}
155	}
156
157	void
158	intr()
159	{
160
161	longjmp(toplevel, 1);
162	}
163
164	void
165	lostpeer()
166	{
167	extern FILE *cout;
168	extern int data;
169
170	if (connected) {
171	if (cout != NULL) {
172	(void) shutdown(fileno(cout), 1+1);
173	(void) fclose(cout);
174	cout = NULL;
175	}
176	if (data >= 0) {
177	(void) shutdown(data, 1+1);
178	(void) close(data);
179	data = -1;
180	}
181	connected = 0;
182	}
183	pswitch(1);
184	if (connected) {
185	if (cout != NULL) {
186	(void) shutdown(fileno(cout), 1+1);
187	(void) fclose(cout);
188	cout = NULL;
189	}
190	connected = 0;
191	}
192	proxflag = 0;
193	pswitch(0);
194	}
195
196	/char
197	tail(filename)
198	char *filename;
199	{
200	register char *s;
201
202	while (*filename) {
203	s = rindex(filename, '/');
204	if (s == NULL)
205	break;
206	if (s[1])
207	return (s + 1);
208	*s = '\0';
209	}
210	return (filename);
211	}
212	*/
213	/*
214	* Command parser.
215	*/
216	cmdscanner(top)
217	int top;
218	{
219	register struct cmd *c;
220	register int l;
221	struct cmd *getcmd();
222	extern int help();
223
224	if (!top)
225	(void) putchar('\n');
226	for (;;) {
227	if (fromatty) {
228	printf("ftp> ");
229	(void) fflush(stdout);
230	}
231	if (fgets(line, sizeof line, stdin) == NULL)
232	quit();
233	l = strlen(line);
234	if (l == 0)
235	break;
236	if (line[--l] == '\n') {
237	if (l == 0)
238	break;
239	line[l] = '\0';
240	} else if (l == sizeof(line) - 2) {
241	printf("sorry, input line too long\n");
242	while ((l = getchar()) != '\n' && l != EOF)
243	/* void */;
244	break;
245	} /* else it was a line without a newline */
246	makeargv();
247	if (margc == 0) {
248	continue;
249	}
250	c = getcmd(margv[0]);
251	if (c == (struct cmd *)-1) {
252	printf("?Ambiguous command\n");
253	continue;
254	}
255	if (c == 0) {
256	printf("?Invalid command\n");
257	continue;
258	}
259	if (c->c_conn && !connected) {
260	printf("Not connected.\n");
261	continue;
262	}
263	(*c->c_handler)(margc, margv);
264	if (bell && c->c_bell)
265	(void) putchar('\007');
266	if (c->c_handler != help)
267	break;
268	}
269	(void) signal(SIGINT, intr);
270	(void) signal(SIGPIPE, lostpeer);
271	}
272
273	struct cmd *
274	getcmd(name)
275	register char *name;
276	{
277	extern struct cmd cmdtab[];
278	register char p, q;
279	register struct cmd c, found;
280	register int nmatches, longest;
281
282	longest = 0;
283	nmatches = 0;
284	found = 0;
285	for (c = cmdtab; p = c->c_name; c++) {
286	for (q = name; q == p++; q++)
287	if (q == 0) / exact match? */
288	return (c);
289	if (!q) { / the name was a prefix */
290	if (q - name > longest) {
291	longest = q - name;
292	nmatches = 1;
293	found = c;
294	} else if (q - name == longest)
295	nmatches++;
296	}
297	}
298	if (nmatches > 1)
299	return ((struct cmd *)-1);
300	return (found);
301	}
302
303	/*
304	* Slice a string up into argc/argv.
305	*/
306
307	int slrflag;
308
309	makeargv()
310	{
311	char **argp;
312	char *slurpstring();
313
314	margc = 0;
315	argp = margv;
316	stringbase = line; /* scan from first of buffer */
317	argbase = argbuf; /* store from first of buffer */
318	slrflag = 0;
319	while (*argp++ = slurpstring())
320	margc++;
321	}
322
323	/*
324	* Parse string into argbuf;
325	* implemented with FSM to
326	* handle quoting and strings
327	*/
328	char *
329	slurpstring()
330	{
331	int got_one = 0;
332	register char *sb = stringbase;
333	register char *ap = argbase;
334	char tmp = argbase; / will return this if token found */
335
336	if (sb == '!' \|\| sb == '$') { /* recognize ! as a token for shell */
337	switch (slrflag) { /* and $ as token for macro invoke */
338	case 0:
339	slrflag++;
340	stringbase++;
341	return ((*sb == '!') ? "!" : "$");
342	/* NOTREACHED */
343	case 1:
344	slrflag++;
345	altarg = stringbase;
346	break;
347	default:
348	break;
349	}
350	}
351
352	S0:
353	switch (*sb) {
354
355	case '\0':
356	goto OUT;
357
358	case ' ':
359	case '\t':
360	sb++; goto S0;
361
362	default:
363	switch (slrflag) {
364	case 0:
365	slrflag++;
366	break;
367	case 1:
368	slrflag++;
369	altarg = sb;
370	break;
371	default:
372	break;
373	}
374	goto S1;
375	}
376
377	S1:
378	switch (*sb) {
379
380	case ' ':
381	case '\t':
382	case '\0':
383	goto OUT; /* end of token */
384
385	case '\\':
386	sb++; goto S2; /* slurp next character */
387
388	case '"':
389	sb++; goto S3; /* slurp quoted string */
390
391	default:
392	ap++ = sb++; /* add character to token */
393	got_one = 1;
394	goto S1;
395	}
396
397	S2:
398	switch (*sb) {
399
400	case '\0':
401	goto OUT;
402
403	default:
404	ap++ = sb++;
405	got_one = 1;
406	goto S1;
407	}
408
409	S3:
410	switch (*sb) {
411
412	case '\0':
413	goto OUT;
414
415	case '"':
416	sb++; goto S1;
417
418	default:
419	ap++ = sb++;
420	got_one = 1;
421	goto S3;
422	}
423
424	OUT:
425	if (got_one)
426	*ap++ = '\0';
427	argbase = ap; /* update storage pointer */
428	stringbase = sb; /* update scan pointer */
429	if (got_one) {
430	return(tmp);
431	}
432	switch (slrflag) {
433	case 0:
434	slrflag++;
435	break;
436	case 1:
437	slrflag++;
438	altarg = (char *) 0;
439	break;
440	default:
441	break;
442	}
443	return((char *)0);
444	}
445
446	#define HELPINDENT (sizeof ("directory"))
447
448	/*
449	* Help command.
450	* Call each command handler with argc == 0 and argv[0] == name.
451	*/
452	help(argc, argv)
453	int argc;
454	char *argv[];
455	{
456	extern struct cmd cmdtab[];
457	register struct cmd *c;
458
459	if (argc == 1) {
460	register int i, j, w, k;
461	int columns, width = 0, lines;
462	extern int NCMDS;
463
464	printf("Commands may be abbreviated. Commands are:\n\n");
465	for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
466	int len = strlen(c->c_name);
467
468	if (len > width)
469	width = len;
470	}
471	width = (width + 8) &~ 7;
472	columns = 80 / width;
473	if (columns == 0)
474	columns = 1;
475	lines = (NCMDS + columns - 1) / columns;
476	for (i = 0; i < lines; i++) {
477	for (j = 0; j < columns; j++) {
478	c = cmdtab + j * lines + i;
479	if (c->c_name && (!proxy \|\| c->c_proxy)) {
480	printf("%s", c->c_name);
481	}
482	else if (c->c_name) {
483	for (k=0; k < strlen(c->c_name); k++) {
484	(void) putchar(' ');
485	}
486	}
487	if (c + lines >= &cmdtab[NCMDS]) {
488	printf("\n");
489	break;
490	}
491	w = strlen(c->c_name);
492	while (w < width) {
493	w = (w + 8) &~ 7;
494	(void) putchar('\t');
495	}
496	}
497	}
498	return;
499	}
500	while (--argc > 0) {
501	register char *arg;
502	arg = *++argv;
503	c = getcmd(arg);
504	if (c == (struct cmd *)-1)
505	printf("?Ambiguous help command %s\n", arg);
506	else if (c == (struct cmd *)0)
507	printf("?Invalid help command %s\n", arg);
508	else
509	printf("%-*s\t%s\n", HELPINDENT,
510	c->c_name, c->c_help);
511	}
512	}