[unix-history] / usr.bin / mail / aux.c

/*
 * Copyright (c) 1980 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
static char sccsid[] = "@(#)aux.c	5.20 (Berkeley) 6/25/90";
#endif /* not lint */

#include "rcv.h"
#include <sys/stat.h>
#include <sys/time.h>

/*
 * Mail -- a mail program
 *
 * Auxiliary functions.
 */

/*
 * Return a pointer to a dynamic copy of the argument.
 */
char *
savestr(str)
	char *str;
{
	char *new;
	int size = strlen(str) + 1;

	if ((new = salloc(size)) != NOSTR)
		bcopy(str, new, size);
	return new;
}

/*
 * Announce a fatal error and die.
 */

/*VARARGS1*/
panic(fmt, a, b)
	char *fmt;
{
	fprintf(stderr, "panic: ");
	fprintf(stderr, fmt, a, b);
	putc('\n', stderr);
	fflush(stdout);
	abort();
}

/*
 * Touch the named message by setting its MTOUCH flag.
 * Touched messages have the effect of not being sent
 * back to the system mailbox on exit.
 */
touch(mp)
	register struct message *mp;
{

	mp->m_flag |= MTOUCH;
	if ((mp->m_flag & MREAD) == 0)
		mp->m_flag |= MREAD|MSTATUS;
}

/*
 * Test to see if the passed file name is a directory.
 * Return true if it is.
 */
isdir(name)
	char name[];
{
	struct stat sbuf;

	if (stat(name, &sbuf) < 0)
		return(0);
	return((sbuf.st_mode & S_IFMT) == S_IFDIR);
}

/*
 * Count the number of arguments in the given string raw list.
 */
argcount(argv)
	char **argv;
{
	register char **ap;

	for (ap = argv; *ap++ != NOSTR;)
		;	
	return ap - argv - 1;
}

/*
 * Return the desired header line from the passed message
 * pointer (or NOSTR if the desired header field is not available).
 */
char *
hfield(field, mp)
	char field[];
	struct message *mp;
{
	register FILE *ibuf;
	char linebuf[LINESIZE];
	register int lc;
	register char *hfield;
	char *colon;

	ibuf = setinput(mp);
	if ((lc = mp->m_lines - 1) < 0)
		return NOSTR;
	if (readline(ibuf, linebuf, LINESIZE) < 0)
		return NOSTR;
	while (lc > 0) {
		if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
			return NOSTR;
		if (hfield = ishfield(linebuf, colon, field))
			return savestr(hfield);
	}
	return NOSTR;
}

/*
 * Return the next header field found in the given message.
 * Return >= 0 if something found, < 0 elsewise.
 * "colon" is set to point to the colon in the header.
 * Must deal with \ continuations & other such fraud.
 */
gethfield(f, linebuf, rem, colon)
	register FILE *f;
	char linebuf[];
	register int rem;
	char **colon;
{
	char line2[LINESIZE];
	register char *cp, *cp2;
	register int c;

	for (;;) {
		if (--rem < 0)
			return -1;
		if ((c = readline(f, linebuf, LINESIZE)) <= 0)
			return -1;
		for (cp = linebuf; isprint(*cp) && *cp != ' ' && *cp != ':';
		     cp++)
			;
		if (*cp != ':' || cp == linebuf)
			continue;
		/*
		 * I guess we got a headline.
		 * Handle wraparounding
		 */
		*colon = cp;
		cp = linebuf + c;
		for (;;) {
			while (--cp >= linebuf && (*cp == ' ' || *cp == '\t'))
				;
			cp++;
			if (rem <= 0)
				break;
			ungetc(c = getc(f), f);
			if (c != ' ' && c != '\t')
				break;
			if ((c = readline(f, line2, LINESIZE)) < 0)
				break;
			rem--;
			for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++)
				;
			c -= cp2 - line2;
			if (cp + c >= linebuf + LINESIZE - 2)
				break;
			*cp++ = ' ';
			bcopy(cp2, cp, c);
			cp += c;
		}
		*cp = 0;
		return rem;
	}
	/* NOTREACHED */
}

/*
 * Check whether the passed line is a header line of
 * the desired breed.  Return the field body, or 0.
 */

char*
ishfield(linebuf, colon, field)
	char linebuf[], field[];
	char *colon;
{
	register char *cp = colon;

	*cp = 0;
	if (strcasecmp(linebuf, field) != 0) {
		*cp = ':';
		return 0;
	}
	*cp = ':';
	for (cp++; *cp == ' ' || *cp == '\t'; cp++)
		;
	return cp;
}

/*
 * Copy a string, lowercasing it as we go.
 */
istrcpy(dest, src)
	register char *dest, *src;
{

	do {
		if (isupper(*src))
			*dest++ = tolower(*src);
		else
			*dest++ = *src;
	} while (*src++ != 0);
}

/*
 * The following code deals with input stacking to do source
 * commands.  All but the current file pointer are saved on
 * the stack.
 */

static	int	ssp;			/* Top of file stack */
struct sstack {
	FILE	*s_file;		/* File we were in. */
	int	s_cond;			/* Saved state of conditionals */
	int	s_loading;		/* Loading .mailrc, etc. */
} sstack[NOFILE];

/*
 * Pushdown current input file and switch to a new one.
 * Set the global flag "sourcing" so that others will realize
 * that they are no longer reading from a tty (in all probability).
 */
source(arglist)
	char **arglist;
{
	FILE *fi;
	char *cp;

	if ((cp = expand(*arglist)) == NOSTR)
		return(1);
	if ((fi = Fopen(cp, "r")) == NULL) {
		perror(cp);
		return(1);
	}
	if (ssp >= NOFILE - 1) {
		printf("Too much \"sourcing\" going on.\n");
		Fclose(fi);
		return(1);
	}
	sstack[ssp].s_file = input;
	sstack[ssp].s_cond = cond;
	sstack[ssp].s_loading = loading;
	ssp++;
	loading = 0;
	cond = CANY;
	input = fi;
	sourcing++;
	return(0);
}

/*
 * Pop the current input back to the previous level.
 * Update the "sourcing" flag as appropriate.
 */
unstack()
{
	if (ssp <= 0) {
		printf("\"Source\" stack over-pop.\n");
		sourcing = 0;
		return(1);
	}
	Fclose(input);
	if (cond != CANY)
		printf("Unmatched \"if\"\n");
	ssp--;
	cond = sstack[ssp].s_cond;
	loading = sstack[ssp].s_loading;
	input = sstack[ssp].s_file;
	if (ssp == 0)
		sourcing = loading;
	return(0);
}

/*
 * Touch the indicated file.
 * This is nifty for the shell.
 */
alter(name)
	char *name;
{
	struct stat sb;
	struct timeval tv[2];
	time_t time();

	if (stat(name, &sb))
		return;
	tv[0].tv_sec = time((time_t *)0) + 1;
	tv[1].tv_sec = sb.st_mtime;
	tv[0].tv_usec = tv[1].tv_usec = 0;
	(void)utimes(name, tv);
}

/*
 * Examine the passed line buffer and
 * return true if it is all blanks and tabs.
 */
blankline(linebuf)
	char linebuf[];
{
	register char *cp;

	for (cp = linebuf; *cp; cp++)
		if (*cp != ' ' && *cp != '\t')
			return(0);
	return(1);
}

/*
 * Get sender's name from this message.  If the message has
 * a bunch of arpanet stuff in it, we may have to skin the name
 * before returning it.
 */
char *
nameof(mp, reptype)
	register struct message *mp;
{
	register char *cp, *cp2;

	cp = skin(name1(mp, reptype));
	if (reptype != 0 || charcount(cp, '!') < 2)
		return(cp);
	cp2 = rindex(cp, '!');
	cp2--;
	while (cp2 > cp && *cp2 != '!')
		cp2--;
	if (*cp2 == '!')
		return(cp2 + 1);
	return(cp);
}

/*
 * Start of a "comment".
 * Ignore it.
 */
char *
skip_comment(cp)
	register char *cp;
{
	register nesting = 1;

	for (; nesting > 0 && *cp; cp++) {
		switch (*cp) {
		case '\\':
			if (cp[1])
				cp++;
			break;
		case '(':
			nesting++;
			break;
		case ')':
			nesting--;
			break;
		}
	}
	return cp;
}

/*
 * Skin an arpa net address according to the RFC 822 interpretation
 * of "host-phrase."
 */
char *
skin(name)
	char *name;
{
	register int c;
	register char *cp, *cp2;
	char *bufend;
	int gotlt, lastsp;
	char nbuf[BUFSIZ];

	if (name == NOSTR)
		return(NOSTR);
	if (index(name, '(') == NOSTR && index(name, '<') == NOSTR
	    && index(name, ' ') == NOSTR)
		return(name);
	gotlt = 0;
	lastsp = 0;
	bufend = nbuf;
	for (cp = name, cp2 = bufend; c = *cp++; ) {
		switch (c) {
		case '(':
			cp = skip_comment(cp);
			lastsp = 0;
			break;

		case '"':
			/*
			 * Start of a "quoted-string".
			 * Copy it in its entirety.
			 */
			while (c = *cp) {
				cp++;
				if (c == '"')
					break;
				if (c != '\\')
					*cp2++ = c;
				else if (c = *cp) {
					*cp2++ = c;
					cp++;
				}
			}
			lastsp = 0;
			break;

		case ' ':
			if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
				cp += 3, *cp2++ = '@';
			else
			if (cp[0] == '@' && cp[1] == ' ')
				cp += 2, *cp2++ = '@';
			else
				lastsp = 1;
			break;

		case '<':
			cp2 = bufend;
			gotlt++;
			lastsp = 0;
			break;

		case '>':
			if (gotlt) {
				gotlt = 0;
				while ((c = *cp) && c != ',') {
					cp++;
					if (c == '(')
						cp = skip_comment(cp);
					else if (c == '"')
						while (c = *cp) {
							cp++;
							if (c == '"')
								break;
							if (c == '\\' && *cp)
								cp++;
						}
				}
				lastsp = 0;
				break;
			}
			/* Fall into . . . */

		default:
			if (lastsp) {
				lastsp = 0;
				*cp2++ = ' ';
			}
			*cp2++ = c;
			if (c == ',' && !gotlt) {
				*cp2++ = ' ';
				for (; *cp == ' '; cp++)
					;
				lastsp = 0;
				bufend = cp2;
			}
		}
	}
	*cp2 = 0;

	return(savestr(nbuf));
}

/*
 * Fetch the sender's name from the passed message.
 * Reptype can be
 *	0 -- get sender's name for display purposes
 *	1 -- get sender's name for reply
 *	2 -- get sender's name for Reply
 */
char *
name1(mp, reptype)
	register struct message *mp;
{
	char namebuf[LINESIZE];
	char linebuf[LINESIZE];
	register char *cp, *cp2;
	register FILE *ibuf;
	int first = 1;

	if ((cp = hfield("from", mp)) != NOSTR)
		return cp;
	if (reptype == 0 && (cp = hfield("sender", mp)) != NOSTR)
		return cp;
	ibuf = setinput(mp);
	namebuf[0] = 0;
	if (readline(ibuf, linebuf, LINESIZE) < 0)
		return(savestr(namebuf));
newname:
	for (cp = linebuf; *cp && *cp != ' '; cp++)
		;
	for (; *cp == ' ' || *cp == '\t'; cp++)
		;
	for (cp2 = &namebuf[strlen(namebuf)];
	     *cp && *cp != ' ' && *cp != '\t' && cp2 < namebuf + LINESIZE - 1;)
		*cp2++ = *cp++;
	*cp2 = '\0';
	if (readline(ibuf, linebuf, LINESIZE) < 0)
		return(savestr(namebuf));
	if ((cp = index(linebuf, 'F')) == NULL)
		return(savestr(namebuf));
	if (strncmp(cp, "From", 4) != 0)
		return(savestr(namebuf));
	while ((cp = index(cp, 'r')) != NULL) {
		if (strncmp(cp, "remote", 6) == 0) {
			if ((cp = index(cp, 'f')) == NULL)
				break;
			if (strncmp(cp, "from", 4) != 0)
				break;
			if ((cp = index(cp, ' ')) == NULL)
				break;
			cp++;
			if (first) {
				strcpy(namebuf, cp);
				first = 0;
			} else
				strcpy(rindex(namebuf, '!')+1, cp);
			strcat(namebuf, "!");
			goto newname;
		}
		cp++;
	}
	return(savestr(namebuf));
}

/*
 * Count the occurances of c in str
 */
charcount(str, c)
	char *str;
{
	register char *cp;
	register int i;

	for (i = 0, cp = str; *cp; cp++)
		if (*cp == c)
			i++;
	return(i);
}

/*
 * Are any of the characters in the two strings the same?
 */
anyof(s1, s2)
	register char *s1, *s2;
{

	while (*s1)
		if (index(s2, *s1++))
			return 1;
	return 0;
}

/*
 * Convert c to upper case
 */
raise(c)
	register c;
{

	if (islower(c))
		return toupper(c);
	return c;
}

/*
 * Copy s1 to s2, return pointer to null in s2.
 */
char *
copy(s1, s2)
	register char *s1, *s2;
{

	while (*s2++ = *s1++)
		;
	return s2 - 1;
}

/*
 * See if the given header field is supposed to be ignored.
 */
isign(field, ignore)
	char *field;
	struct ignoretab ignore[2];
{
	char realfld[BUFSIZ];

	if (ignore == ignoreall)
		return 1;
	/*
	 * Lower-case the string, so that "Status" and "status"
	 * will hash to the same place.
	 */
	istrcpy(realfld, field);
	if (ignore[1].i_count > 0)
		return (!member(realfld, ignore + 1));
	else
		return (member(realfld, ignore));
}

member(realfield, table)
	register char *realfield;
	struct ignoretab *table;
{
	register struct ignore *igp;

	for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
		if (*igp->i_field == *realfield &&
		    equal(igp->i_field, realfield))
			return (1);
	return (0);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1980 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	static char sccsid[] = "@(#)aux.c 5.20 (Berkeley) 6/25/90";
	36	#endif /* not lint */
	37
	38	#include "rcv.h"
	39	#include <sys/stat.h>
	40	#include <sys/time.h>
	41
	42	/*
	43	* Mail -- a mail program
	44	*
	45	* Auxiliary functions.
	46	*/
	47
	48	/*
	49	* Return a pointer to a dynamic copy of the argument.
	50	*/
	51	char *
	52	savestr(str)
	53	char *str;
	54	{
	55	char *new;
	56	int size = strlen(str) + 1;
	57
	58	if ((new = salloc(size)) != NOSTR)
	59	bcopy(str, new, size);
	60	return new;
	61	}
	62
	63	/*
	64	* Announce a fatal error and die.
65	*/
66
67	/VARARGS1/
68	panic(fmt, a, b)
69	char *fmt;
70	{
71	fprintf(stderr, "panic: ");
72	fprintf(stderr, fmt, a, b);
73	putc('\n', stderr);
74	fflush(stdout);
75	abort();
76	}
77
78	/*
79	* Touch the named message by setting its MTOUCH flag.
80	* Touched messages have the effect of not being sent
81	* back to the system mailbox on exit.
82	*/
83	touch(mp)
84	register struct message *mp;
85	{
86
87	mp->m_flag \|= MTOUCH;
88	if ((mp->m_flag & MREAD) == 0)
89	mp->m_flag \|= MREAD\|MSTATUS;
90	}
91
92	/*
93	* Test to see if the passed file name is a directory.
94	* Return true if it is.
95	*/
96	isdir(name)
97	char name[];
98	{
99	struct stat sbuf;
100
101	if (stat(name, &sbuf) < 0)
102	return(0);
103	return((sbuf.st_mode & S_IFMT) == S_IFDIR);
104	}
105
106	/*
107	* Count the number of arguments in the given string raw list.
108	*/
109	argcount(argv)
110	char **argv;
111	{
112	register char **ap;
113
114	for (ap = argv; *ap++ != NOSTR;)
115	;
116	return ap - argv - 1;
117	}
118
119	/*
120	* Return the desired header line from the passed message
121	* pointer (or NOSTR if the desired header field is not available).
122	*/
123	char *
124	hfield(field, mp)
125	char field[];
126	struct message *mp;
127	{
128	register FILE *ibuf;
129	char linebuf[LINESIZE];
130	register int lc;
131	register char *hfield;
132	char *colon;
133
134	ibuf = setinput(mp);
135	if ((lc = mp->m_lines - 1) < 0)
136	return NOSTR;
137	if (readline(ibuf, linebuf, LINESIZE) < 0)
138	return NOSTR;
139	while (lc > 0) {
140	if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
141	return NOSTR;
142	if (hfield = ishfield(linebuf, colon, field))
143	return savestr(hfield);
144	}
145	return NOSTR;
146	}
147
148	/*
149	* Return the next header field found in the given message.
150	* Return >= 0 if something found, < 0 elsewise.
151	* "colon" is set to point to the colon in the header.
152	* Must deal with \ continuations & other such fraud.
153	*/
154	gethfield(f, linebuf, rem, colon)
155	register FILE *f;
156	char linebuf[];
157	register int rem;
158	char **colon;
159	{
160	char line2[LINESIZE];
161	register char cp, cp2;
162	register int c;
163
164	for (;;) {
165	if (--rem < 0)
166	return -1;
167	if ((c = readline(f, linebuf, LINESIZE)) <= 0)
168	return -1;
169	for (cp = linebuf; isprint(cp) && cp != ' ' && *cp != ':';
170	cp++)
171	;
172	if (*cp != ':' \|\| cp == linebuf)
173	continue;
174	/*
175	* I guess we got a headline.
176	* Handle wraparounding
177	*/
178	*colon = cp;
179	cp = linebuf + c;
180	for (;;) {
181	while (--cp >= linebuf && (cp == ' ' \|\| cp == '\t'))
182	;
183	cp++;
184	if (rem <= 0)
185	break;
186	ungetc(c = getc(f), f);
187	if (c != ' ' && c != '\t')
188	break;
189	if ((c = readline(f, line2, LINESIZE)) < 0)
190	break;
191	rem--;
192	for (cp2 = line2; cp2 == ' ' \|\| cp2 == '\t'; cp2++)
193	;
194	c -= cp2 - line2;
195	if (cp + c >= linebuf + LINESIZE - 2)
196	break;
197	*cp++ = ' ';
198	bcopy(cp2, cp, c);
199	cp += c;
200	}
201	*cp = 0;
202	return rem;
203	}
204	/* NOTREACHED */
205	}
206
207	/*
208	* Check whether the passed line is a header line of
209	* the desired breed. Return the field body, or 0.
210	*/
211
212	char*
213	ishfield(linebuf, colon, field)
214	char linebuf[], field[];
215	char *colon;
216	{
217	register char *cp = colon;
218
219	*cp = 0;
220	if (strcasecmp(linebuf, field) != 0) {
221	*cp = ':';
222	return 0;
223	}
224	*cp = ':';
225	for (cp++; cp == ' ' \|\| cp == '\t'; cp++)
226	;
227	return cp;
228	}
229
230	/*
231	* Copy a string, lowercasing it as we go.
232	*/
233	istrcpy(dest, src)
234	register char dest, src;
235	{
236
237	do {
238	if (isupper(*src))
239	dest++ = tolower(src);
240	else
241	dest++ = src;
242	} while (*src++ != 0);
243	}
244
245	/*
246	* The following code deals with input stacking to do source
247	* commands. All but the current file pointer are saved on
248	* the stack.
249	*/
250
251	static int ssp; /* Top of file stack */
252	struct sstack {
253	FILE s_file; / File we were in. */
254	int s_cond; /* Saved state of conditionals */
255	int s_loading; /* Loading .mailrc, etc. */
256	} sstack[NOFILE];
257
258	/*
259	* Pushdown current input file and switch to a new one.
260	* Set the global flag "sourcing" so that others will realize
261	* that they are no longer reading from a tty (in all probability).
262	*/
263	source(arglist)
264	char **arglist;
265	{
266	FILE *fi;
267	char *cp;
268
269	if ((cp = expand(*arglist)) == NOSTR)
270	return(1);
271	if ((fi = Fopen(cp, "r")) == NULL) {
272	perror(cp);
273	return(1);
274	}
275	if (ssp >= NOFILE - 1) {
276	printf("Too much \"sourcing\" going on.\n");
277	Fclose(fi);
278	return(1);
279	}
280	sstack[ssp].s_file = input;
281	sstack[ssp].s_cond = cond;
282	sstack[ssp].s_loading = loading;
283	ssp++;
284	loading = 0;
285	cond = CANY;
286	input = fi;
287	sourcing++;
288	return(0);
289	}
290
291	/*
292	* Pop the current input back to the previous level.
293	* Update the "sourcing" flag as appropriate.
294	*/
295	unstack()
296	{
297	if (ssp <= 0) {
298	printf("\"Source\" stack over-pop.\n");
299	sourcing = 0;
300	return(1);
301	}
302	Fclose(input);
303	if (cond != CANY)
304	printf("Unmatched \"if\"\n");
305	ssp--;
306	cond = sstack[ssp].s_cond;
307	loading = sstack[ssp].s_loading;
308	input = sstack[ssp].s_file;
309	if (ssp == 0)
310	sourcing = loading;
311	return(0);
312	}
313
314	/*
315	* Touch the indicated file.
316	* This is nifty for the shell.
317	*/
318	alter(name)
319	char *name;
320	{
321	struct stat sb;
322	struct timeval tv[2];
323	time_t time();
324
325	if (stat(name, &sb))
326	return;
327	tv[0].tv_sec = time((time_t *)0) + 1;
328	tv[1].tv_sec = sb.st_mtime;
329	tv[0].tv_usec = tv[1].tv_usec = 0;
330	(void)utimes(name, tv);
331	}
332
333	/*
334	* Examine the passed line buffer and
335	* return true if it is all blanks and tabs.
336	*/
337	blankline(linebuf)
338	char linebuf[];
339	{
340	register char *cp;
341
342	for (cp = linebuf; *cp; cp++)
343	if (cp != ' ' && cp != '\t')
344	return(0);
345	return(1);
346	}
347
348	/*
349	* Get sender's name from this message. If the message has
350	* a bunch of arpanet stuff in it, we may have to skin the name
351	* before returning it.
352	*/
353	char *
354	nameof(mp, reptype)
355	register struct message *mp;
356	{
357	register char cp, cp2;
358
359	cp = skin(name1(mp, reptype));
360	if (reptype != 0 \|\| charcount(cp, '!') < 2)
361	return(cp);
362	cp2 = rindex(cp, '!');
363	cp2--;
364	while (cp2 > cp && *cp2 != '!')
365	cp2--;
366	if (*cp2 == '!')
367	return(cp2 + 1);
368	return(cp);
369	}
370
371	/*
372	* Start of a "comment".
373	* Ignore it.
374	*/
375	char *
376	skip_comment(cp)
377	register char *cp;
378	{
379	register nesting = 1;
380
381	for (; nesting > 0 && *cp; cp++) {
382	switch (*cp) {
383	case '\\':
384	if (cp[1])
385	cp++;
386	break;
387	case '(':
388	nesting++;
389	break;
390	case ')':
391	nesting--;
392	break;
393	}
394	}
395	return cp;
396	}
397
398	/*
399	* Skin an arpa net address according to the RFC 822 interpretation
400	* of "host-phrase."
401	*/
402	char *
403	skin(name)
404	char *name;
405	{
406	register int c;
407	register char cp, cp2;
408	char *bufend;
409	int gotlt, lastsp;
410	char nbuf[BUFSIZ];
411
412	if (name == NOSTR)
413	return(NOSTR);
414	if (index(name, '(') == NOSTR && index(name, '<') == NOSTR
415	&& index(name, ' ') == NOSTR)
416	return(name);
417	gotlt = 0;
418	lastsp = 0;
419	bufend = nbuf;
420	for (cp = name, cp2 = bufend; c = *cp++; ) {
421	switch (c) {
422	case '(':
423	cp = skip_comment(cp);
424	lastsp = 0;
425	break;
426
427	case '"':
428	/*
429	* Start of a "quoted-string".
430	* Copy it in its entirety.
431	*/
432	while (c = *cp) {
433	cp++;
434	if (c == '"')
435	break;
436	if (c != '\\')
437	*cp2++ = c;
438	else if (c = *cp) {
439	*cp2++ = c;
440	cp++;
441	}
442	}
443	lastsp = 0;
444	break;
445
446	case ' ':
447	if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
448	cp += 3, *cp2++ = '@';
449	else
450	if (cp[0] == '@' && cp[1] == ' ')
451	cp += 2, *cp2++ = '@';
452	else
453	lastsp = 1;
454	break;
455
456	case '<':
457	cp2 = bufend;
458	gotlt++;
459	lastsp = 0;
460	break;
461
462	case '>':
463	if (gotlt) {
464	gotlt = 0;
465	while ((c = *cp) && c != ',') {
466	cp++;
467	if (c == '(')
468	cp = skip_comment(cp);
469	else if (c == '"')
470	while (c = *cp) {
471	cp++;
472	if (c == '"')
473	break;
474	if (c == '\\' && *cp)
475	cp++;
476	}
477	}
478	lastsp = 0;
479	break;
480	}
481	/* Fall into . . . */
482
483	default:
484	if (lastsp) {
485	lastsp = 0;
486	*cp2++ = ' ';
487	}
488	*cp2++ = c;
489	if (c == ',' && !gotlt) {
490	*cp2++ = ' ';
491	for (; *cp == ' '; cp++)
492	;
493	lastsp = 0;
494	bufend = cp2;
495	}
496	}
497	}
498	*cp2 = 0;
499
500	return(savestr(nbuf));
501	}
502
503	/*
504	* Fetch the sender's name from the passed message.
505	* Reptype can be
506	* 0 -- get sender's name for display purposes
507	* 1 -- get sender's name for reply
508	* 2 -- get sender's name for Reply
509	*/
510	char *
511	name1(mp, reptype)
512	register struct message *mp;
513	{
514	char namebuf[LINESIZE];
515	char linebuf[LINESIZE];
516	register char cp, cp2;
517	register FILE *ibuf;
518	int first = 1;
519
520	if ((cp = hfield("from", mp)) != NOSTR)
521	return cp;
522	if (reptype == 0 && (cp = hfield("sender", mp)) != NOSTR)
523	return cp;
524	ibuf = setinput(mp);
525	namebuf[0] = 0;
526	if (readline(ibuf, linebuf, LINESIZE) < 0)
527	return(savestr(namebuf));
528	newname:
529	for (cp = linebuf; cp && cp != ' '; cp++)
530	;
531	for (; cp == ' ' \|\| cp == '\t'; cp++)
532	;
533	for (cp2 = &namebuf[strlen(namebuf)];
534	cp && cp != ' ' && *cp != '\t' && cp2 < namebuf + LINESIZE - 1;)
535	cp2++ = cp++;
536	*cp2 = '\0';
537	if (readline(ibuf, linebuf, LINESIZE) < 0)
538	return(savestr(namebuf));
539	if ((cp = index(linebuf, 'F')) == NULL)
540	return(savestr(namebuf));
541	if (strncmp(cp, "From", 4) != 0)
542	return(savestr(namebuf));
543	while ((cp = index(cp, 'r')) != NULL) {
544	if (strncmp(cp, "remote", 6) == 0) {
545	if ((cp = index(cp, 'f')) == NULL)
546	break;
547	if (strncmp(cp, "from", 4) != 0)
548	break;
549	if ((cp = index(cp, ' ')) == NULL)
550	break;
551	cp++;
552	if (first) {
553	strcpy(namebuf, cp);
554	first = 0;
555	} else
556	strcpy(rindex(namebuf, '!')+1, cp);
557	strcat(namebuf, "!");
558	goto newname;
559	}
560	cp++;
561	}
562	return(savestr(namebuf));
563	}
564
565	/*
566	* Count the occurances of c in str
567	*/
568	charcount(str, c)
569	char *str;
570	{
571	register char *cp;
572	register int i;
573
574	for (i = 0, cp = str; *cp; cp++)
575	if (*cp == c)
576	i++;
577	return(i);
578	}
579
580	/*
581	* Are any of the characters in the two strings the same?
582	*/
583	anyof(s1, s2)
584	register char s1, s2;
585	{
586
587	while (*s1)
588	if (index(s2, *s1++))
589	return 1;
590	return 0;
591	}
592
593	/*
594	* Convert c to upper case
595	*/
596	raise(c)
597	register c;
598	{
599
600	if (islower(c))
601	return toupper(c);
602	return c;
603	}
604
605	/*
606	* Copy s1 to s2, return pointer to null in s2.
607	*/
608	char *
609	copy(s1, s2)
610	register char s1, s2;
611	{
612
613	while (s2++ = s1++)
614	;
615	return s2 - 1;
616	}
617
618	/*
619	* See if the given header field is supposed to be ignored.
620	*/
621	isign(field, ignore)
622	char *field;
623	struct ignoretab ignore[2];
624	{
625	char realfld[BUFSIZ];
626
627	if (ignore == ignoreall)
628	return 1;
629	/*
630	* Lower-case the string, so that "Status" and "status"
631	* will hash to the same place.
632	*/
633	istrcpy(realfld, field);
634	if (ignore[1].i_count > 0)
635	return (!member(realfld, ignore + 1));
636	else
637	return (member(realfld, ignore));
638	}
639
640	member(realfield, table)
641	register char *realfield;
642	struct ignoretab *table;
643	{
644	register struct ignore *igp;
645
646	for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
647	if (igp->i_field == realfield &&
648	equal(igp->i_field, realfield))
649	return (1);
650	return (0);
651	}