[unix-history] / usr / src / usr.bin / mail / lex.c

#

#include "rcv.h"

/*
 * Mail -- a mail program
 *
 * Lexical processing of commands.
 */

static char *SccsId = "@(#)lex.c	1.2 %G%";

/*
 * Interpret user commands one by one.  If standard input is not a tty,
 * print no prompt.
 */

int	*msgvec;

commands()
{
	int prompt, firstsw, stop();
	register int n;
	char linebuf[LINESIZE];

	msgvec = (int *) calloc((unsigned) (msgCount + 1), sizeof *msgvec);
	if (rcvmode)
		if (signal(SIGINT, SIG_IGN) == SIG_DFL)
			signal(SIGINT, stop);
	input = stdin;
	prompt = 1;
	if (!intty)
		prompt = 0;
	firstsw = 1;
	for (;;) {
		setexit();
		if (firstsw > 0) {
			firstsw = 0;
			source1(mailrc);
			if (!nosrc)
				source1(MASTER);
		}

		/*
		 * How's this for obscure:  after we
		 * finish sourcing for the first time,
		 * go off and print the headers!
		 */

		if (firstsw == 0 && !sourcing) {
			firstsw = -1;
			if (rcvmode)
				announce();
		}

		/*
		 * Print the prompt, if needed.  Clear out
		 * string space, and flush the output.
		 */

		if (!rcvmode && !sourcing)
			return;
top:
		if (prompt && !sourcing)
			printf("_\r");
		flush();
		sreset();

		/*
		 * Read a line of commands from the current input
		 * and handle end of file specially.
		 */

		n = 0;
		for (;;) {
			if (readline(input, &linebuf[n]) <= 0) {
				if (n != 0)
					break;
				if (sourcing) {
					unstack();
					goto more;
				}
				if (value("ignoreeof") != NOSTR && prompt) {
					printf("Use \"quit\" to quit.\n");
					goto top;
				}
				if (!edit) {
					signal(SIGINT, SIG_IGN);
					return;
				}
				edstop();
				return;
			}
			if ((n = strlen(linebuf)) == 0)
				break;
			n--;
			if (linebuf[n] != '\\')
				break;
			linebuf[n++] = ' ';
		}
		if (execute(linebuf))
			return;
more:		;
	}
}

/*
 * Execute a single command.  If the command executed
 * is "quit," then return non-zero so that the caller
 * will know to return back to main, if he cares.
 */

execute(linebuf)
	char linebuf[];
{
	char word[LINESIZE];
	char *arglist[MAXARGC];
	struct cmd *com;
	register char *cp, *cp2;
	register int c;
	int edstop(), e;

	/*
	 * Strip the white space away from the beginning
	 * of the command, then scan out a word, which
	 * consists of anything except digits and white space.
	 *
	 * Handle ! escapes differently to get the correct
	 * lexical conventions.
	 */

	cp = linebuf;
	while (any(*cp, " \t"))
		cp++;
	if (*cp == '!') {
		if (sourcing) {
			printf("Can't \"!\" while sourcing\n");
			unstack();
			return(0);
		}
		shell(cp+1);
		return(0);
	}
	cp2 = word;
	while (*cp && !any(*cp, " \t0123456789$^.-+*'\""))
		*cp2++ = *cp++;
	*cp2 = '\0';

	/*
	 * Look up the command; if not found, bitch.
	 * Normally, a blank command would map to the
	 * first command in the table; while sourcing,
	 * however, we ignore blank lines to eliminate
	 * confusion.
	 */

	if (sourcing && equal(word, ""))
		return(0);
	com = lex(word);
	if (com == NONE) {
		printf("What?\n");
		if (sourcing)
			unstack();
		return(0);
	}

	/*
	 * Special case so that quit causes a return to
	 * main, who will call the quit code directly.
	 * If we are in a source file, just unstack.
	 */

	if (com->c_func == edstop && sourcing) {
		unstack();
		return(0);
	}
	if (!edit && com->c_func == edstop) {
		signal(SIGINT, SIG_IGN);
		return(1);
	}

	/*
	 * Process the arguments to the command, depending
	 * on the type he expects.  Default to an error.
	 * If we are sourcing an interactive command, it's
	 * an error.
	 */

	if (!rcvmode && (com->c_argtype & M) == 0) {
		printf("May not execute \"%s\" while sending\n",
		    com->c_name);
		unstack();
		return(0);
	}
	if (sourcing && com->c_argtype & I) {
		printf("May not execute \"%s\" while sourcing\n",
		    com->c_name);
		unstack();
		return(0);
	}
	e = 1;
	switch (com->c_argtype & ~(P|I|M)) {
	case MSGLIST:
		/*
		 * A message list defaulting to nearest forward
		 * legal message.
		 */
		if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
			break;
		if (c  == 0) {
			*msgvec = first(com->c_msgflag,
				com->c_msgmask);
			msgvec[1] = NULL;
		}
		if (*msgvec == NULL) {
			printf("No applicable messages\n");
			break;
		}
		e = (*com->c_func)(msgvec);
		break;

	case NDMLIST:
		/*
		 * A message list with no defaults, but no error
		 * if none exist.
		 */
		if (getmsglist(cp, msgvec, com->c_msgflag) < 0)
			break;
		e = (*com->c_func)(msgvec);
		break;

	case STRLIST:
		/*
		 * Just the straight string, with
		 * leading blanks removed.
		 */
		while (any(*cp, " \t"))
			cp++;
		e = (*com->c_func)(cp);
		break;

	case RAWLIST:
		/*
		 * A vector of strings, in shell style.
		 */
		if ((c = getrawlist(cp, arglist)) < 0)
			break;
		if (c < com->c_minargs) {
			printf("%s requires at least %d arg(s)\n",
				com->c_name, com->c_minargs);
			break;
		}
		if (c > com->c_maxargs) {
			printf("%s takes no more than %d arg(s)\n",
				com->c_name, com->c_maxargs);
			break;
		}
		e = (*com->c_func)(arglist);
		break;

	case NOLIST:
		/*
		 * Just the constant zero, for exiting,
		 * eg.
		 */
		e = (*com->c_func)(0);
		break;

	default:
		panic("Unknown argtype");
	}

	/*
	 * Exit the current source file on
	 * error.
	 */

	if (e && sourcing)
		unstack();
	if (com->c_func == edstop)
		return(1);
	if (value("autoprint") != NOSTR && com->c_argtype & P)
		if ((dot->m_flag & MDELETED) == 0)
			print(dot);
	if (!sourcing)
		sawcom = 1;
	return(0);
}

/*
 * Find the correct command in the command table corresponding
 * to the passed command "word"
 */

struct cmd *
lex(word)
	char word[];
{
	register struct cmd *cp;
	extern struct cmd cmdtab[];

	for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++)
		if (isprefix(word, cp->c_name))
			return(cp);
	return(NONE);
}

/*
 * Determine if as1 is a valid prefix of as2.
 * Return true if yep.
 */

isprefix(as1, as2)
	char *as1, *as2;
{
	register char *s1, *s2;

	s1 = as1;
	s2 = as2;
	while (*s1++ == *s2)
		if (*s2++ == '\0')
			return(1);
	return(*--s1 == '\0');
}

/*
 * The following gets called on receipt of a rubout.  This is
 * to abort printout of a command, mainly.
 * Dispatching here when command() is inactive crashes rcv.
 * Close all open files except 0, 1, 2, and the temporary.
 * The special call to getuserid() is needed so it won't get
 * annoyed about losing its open file.
 * Also, unstack all source files.
 */

stop()
{
	register FILE *fp;

	noreset = 0;
	signal(SIGINT, SIG_IGN);
	sawcom++;
	while (sourcing)
		unstack();
	getuserid((char *) -1);
	for (fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) {
		if (fp == stdin || fp == stdout)
			continue;
		if (fp == itf || fp == otf)
			continue;
		if (fp == stderr)
			continue;
		fclose(fp);
	}
	if (image >= 0) {
		close(image);
		image = -1;
	}
	clrbuf(stdout);
	printf("Interrupt\n");
	signal(SIGINT, stop);
	reset(0);
}

/*
 * Announce the presence of the current Mail version,
 * give the message count, and print a header listing.
 */

char	*greeting	= "Mail version 2.0 %s.  Type ? for help.\n";

announce()
{
	int vec[2];
	extern char *version;
	register struct message *mp;

	if (value("hold") != NOSTR)
		for (mp = &message[0]; mp < &message[msgCount]; mp++)
			mp->m_flag |= MPRESERVE;
	vec[0] = 1;
	vec[1] = 0;
	if (value("quiet") == NOSTR)
		printf(greeting, version);
	if (msgCount == 1)
		printf("1 message:\n");
	else
		printf("%d messages:\n", msgCount);
	headers(vec);
}

strace() {}

/*
 * Print the current version number.
 */

pversion(e)
{
	printf(greeting, version);
	return(0);
}
Commit	Line	Data
ac72cd41 KS	1	#
	2
	3	#include "rcv.h"
	4
	5	/*
	6	* Mail -- a mail program
	7	*
	8	* Lexical processing of commands.
	9	*/
	10
73f94fab	11	static char *SccsId = "@(#)lex.c 1.2 %G%";
ac72cd41 KS	12
	13	/*
	14	* Interpret user commands one by one. If standard input is not a tty,
	15	* print no prompt.
	16	*/
	17
	18	int *msgvec;
	19
	20	commands()
	21	{
	22	int prompt, firstsw, stop();
	23	register int n;
	24	char linebuf[LINESIZE];
	25
	26	msgvec = (int ) calloc((unsigned) (msgCount + 1), sizeof msgvec);
	27	if (rcvmode)
	28	if (signal(SIGINT, SIG_IGN) == SIG_DFL)
	29	signal(SIGINT, stop);
	30	input = stdin;
	31	prompt = 1;
	32	if (!intty)
	33	prompt = 0;
	34	firstsw = 1;
	35	for (;;) {
	36	setexit();
	37	if (firstsw > 0) {
	38	firstsw = 0;
	39	source1(mailrc);
	40	if (!nosrc)
	41	source1(MASTER);
	42	}
	43
	44	/*
	45	* How's this for obscure: after we
	46	* finish sourcing for the first time,
	47	* go off and print the headers!
	48	*/
	49
	50	if (firstsw == 0 && !sourcing) {
	51	firstsw = -1;
	52	if (rcvmode)
	53	announce();
	54	}
	55
	56	/*
	57	* Print the prompt, if needed. Clear out
	58	* string space, and flush the output.
	59	*/
	60
	61	if (!rcvmode && !sourcing)
	62	return;
73f94fab	63	top:
ac72cd41 KS	64	if (prompt && !sourcing)
	65	printf("_\r");
	66	flush();
	67	sreset();
	68
	69	/*
	70	* Read a line of commands from the current input
	71	* and handle end of file specially.
	72	*/
	73
	74	n = 0;
	75	for (;;) {
	76	if (readline(input, &linebuf[n]) <= 0) {
	77	if (n != 0)
	78	break;
	79	if (sourcing) {
	80	unstack();
	81	goto more;
	82	}
73f94fab KS	83	if (value("ignoreeof") != NOSTR && prompt) {
	84	printf("Use \"quit\" to quit.\n");
	85	goto top;
	86	}
ac72cd41 KS	87	if (!edit) {
	88	signal(SIGINT, SIG_IGN);
	89	return;
	90	}
	91	edstop();
	92	return;
	93	}
	94	if ((n = strlen(linebuf)) == 0)
	95	break;
	96	n--;
	97	if (linebuf[n] != '\\')
	98	break;
	99	linebuf[n++] = ' ';
	100	}
	101	if (execute(linebuf))
	102	return;
	103	more: ;
	104	}
	105	}
	106
	107	/*
	108	* Execute a single command. If the command executed
	109	* is "quit," then return non-zero so that the caller
	110	* will know to return back to main, if he cares.
	111	*/
	112
	113	execute(linebuf)
	114	char linebuf[];
	115	{
	116	char word[LINESIZE];
	117	char *arglist[MAXARGC];
	118	struct cmd *com;
	119	register char cp, cp2;
	120	register int c;
	121	int edstop(), e;
	122
	123	/*
	124	* Strip the white space away from the beginning
	125	* of the command, then scan out a word, which
	126	* consists of anything except digits and white space.
	127	*
	128	* Handle ! escapes differently to get the correct
	129	* lexical conventions.
	130	*/
	131
	132	cp = linebuf;
	133	while (any(*cp, " \t"))
	134	cp++;
	135	if (*cp == '!') {
	136	if (sourcing) {
	137	printf("Can't \"!\" while sourcing\n");
	138	unstack();
	139	return(0);
	140	}
	141	shell(cp+1);
	142	return(0);
	143	}
	144	cp2 = word;
	145	while (cp && !any(cp, " \t0123456789$^.-+*'\""))
	146	cp2++ = cp++;
	147	*cp2 = '\0';
	148
	149	/*
	150	* Look up the command; if not found, bitch.
151	* Normally, a blank command would map to the
152	* first command in the table; while sourcing,
153	* however, we ignore blank lines to eliminate
154	* confusion.
155	*/
156
157	if (sourcing && equal(word, ""))
158	return(0);
159	com = lex(word);
160	if (com == NONE) {
161	printf("What?\n");
162	if (sourcing)
163	unstack();
164	return(0);
165	}
166
167	/*
168	* Special case so that quit causes a return to
169	* main, who will call the quit code directly.
170	* If we are in a source file, just unstack.
171	*/
172
173	if (com->c_func == edstop && sourcing) {
174	unstack();
175	return(0);
176	}
177	if (!edit && com->c_func == edstop) {
178	signal(SIGINT, SIG_IGN);
179	return(1);
180	}
181
182	/*
183	* Process the arguments to the command, depending
184	* on the type he expects. Default to an error.
185	* If we are sourcing an interactive command, it's
186	* an error.
187	*/
188
189	if (!rcvmode && (com->c_argtype & M) == 0) {
190	printf("May not execute \"%s\" while sending\n",
191	com->c_name);
192	unstack();
193	return(0);
194	}
195	if (sourcing && com->c_argtype & I) {
196	printf("May not execute \"%s\" while sourcing\n",
197	com->c_name);
198	unstack();
199	return(0);
200	}
201	e = 1;
202	switch (com->c_argtype & ~(P\|I\|M)) {
203	case MSGLIST:
204	/*
205	* A message list defaulting to nearest forward
206	* legal message.
207	*/
208	if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
209	break;
210	if (c == 0) {
211	*msgvec = first(com->c_msgflag,
212	com->c_msgmask);
213	msgvec[1] = NULL;
214	}
215	if (*msgvec == NULL) {
216	printf("No applicable messages\n");
217	break;
218	}
219	e = (*com->c_func)(msgvec);
220	break;
221
222	case NDMLIST:
223	/*
224	* A message list with no defaults, but no error
225	* if none exist.
226	*/
227	if (getmsglist(cp, msgvec, com->c_msgflag) < 0)
228	break;
229	e = (*com->c_func)(msgvec);
230	break;
231
232	case STRLIST:
233	/*
234	* Just the straight string, with
235	* leading blanks removed.
236	*/
237	while (any(*cp, " \t"))
238	cp++;
239	e = (*com->c_func)(cp);
240	break;
241
242	case RAWLIST:
243	/*
244	* A vector of strings, in shell style.
245	*/
246	if ((c = getrawlist(cp, arglist)) < 0)
247	break;
248	if (c < com->c_minargs) {
249	printf("%s requires at least %d arg(s)\n",
250	com->c_name, com->c_minargs);
251	break;
252	}
253	if (c > com->c_maxargs) {
254	printf("%s takes no more than %d arg(s)\n",
255	com->c_name, com->c_maxargs);
256	break;
257	}
258	e = (*com->c_func)(arglist);
259	break;
260
261	case NOLIST:
262	/*
263	* Just the constant zero, for exiting,
264	* eg.
265	*/
266	e = (*com->c_func)(0);
267	break;
268
269	default:
270	panic("Unknown argtype");
271	}
272
273	/*
274	* Exit the current source file on
275	* error.
276	*/
277
278	if (e && sourcing)
279	unstack();
280	if (com->c_func == edstop)
281	return(1);
282	if (value("autoprint") != NOSTR && com->c_argtype & P)
283	if ((dot->m_flag & MDELETED) == 0)
284	print(dot);
285	if (!sourcing)
286	sawcom = 1;
287	return(0);
288	}
289
290	/*
291	* Find the correct command in the command table corresponding
292	* to the passed command "word"
293	*/
294
295	struct cmd *
296	lex(word)
297	char word[];
298	{
299	register struct cmd *cp;
300	extern struct cmd cmdtab[];
301
302	for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++)
303	if (isprefix(word, cp->c_name))
304	return(cp);
305	return(NONE);
306	}
307
308	/*
309	* Determine if as1 is a valid prefix of as2.
310	* Return true if yep.
311	*/
312
313	isprefix(as1, as2)
314	char as1, as2;
315	{
316	register char s1, s2;
317
318	s1 = as1;
319	s2 = as2;
320	while (s1++ == s2)
321	if (*s2++ == '\0')
322	return(1);
323	return(*--s1 == '\0');
324	}
325
326	/*
327	* The following gets called on receipt of a rubout. This is
328	* to abort printout of a command, mainly.
329	* Dispatching here when command() is inactive crashes rcv.
330	* Close all open files except 0, 1, 2, and the temporary.
331	* The special call to getuserid() is needed so it won't get
332	* annoyed about losing its open file.
333	* Also, unstack all source files.
334	*/
335
336	stop()
337	{
338	register FILE *fp;
339
340	noreset = 0;
341	signal(SIGINT, SIG_IGN);
342	sawcom++;
343	while (sourcing)
344	unstack();
345	getuserid((char *) -1);
346	for (fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) {
347	if (fp == stdin \|\| fp == stdout)
348	continue;
349	if (fp == itf \|\| fp == otf)
350	continue;
351	if (fp == stderr)
352	continue;
353	fclose(fp);
354	}
355	if (image >= 0) {
356	close(image);
357	image = -1;
358	}
359	clrbuf(stdout);
360	printf("Interrupt\n");
361	signal(SIGINT, stop);
362	reset(0);
363	}
364
365	/*
366	* Announce the presence of the current Mail version,
367	* give the message count, and print a header listing.
368	*/
369
370	char *greeting = "Mail version 2.0 %s. Type ? for help.\n";
371
372	announce()
373	{
374	int vec[2];
375	extern char *version;
376	register struct message *mp;
377
378	if (value("hold") != NOSTR)
379	for (mp = &message[0]; mp < &message[msgCount]; mp++)
380	mp->m_flag \|= MPRESERVE;
381	vec[0] = 1;
382	vec[1] = 0;
383	if (value("quiet") == NOSTR)
384	printf(greeting, version);
385	if (msgCount == 1)
386	printf("1 message:\n");
387	else
388	printf("%d messages:\n", msgCount);
389	headers(vec);
390	}
391
392	strace() {}
393
394	/*
395	* Print the current version number.
396	*/
397
398	pversion(e)
399	{
400	printf(greeting, version);
401	return(0);
402	}