Applications/mh: sbr/m_getfld.c comparison

comparison sbr/m_getfld.c @ 0:bce86c4163a3

Initial revision

author	kono
date	Mon, 18 Apr 2005 23:46:02 +0900
parents
children	441a2190cfae

comparison

equal deleted inserted replaced

--1:000000000000
+:bce86c4163a3
+/* m_getfld.c - read/parse a message */
+#ifndef	lint
+static char ident[] = "@(#)$Id$";
+#endif /* lint */
+#include "../h/mh.h"
+#include <stdio.h>
+#include "../zotnet/mts.h"
+#include <ctype.h>
+/* This module has a long and checkered history.  First, it didn't burst
+maildrops correctly because it considered two CTRL-A:s in a row to be
+an inter-message delimiter.  It really is four CTRL-A:s followed by a
+newline.  Unfortunately, MMDF will convert this delimiter *inside* a
+message to a CTRL-B followed by three CTRL-A:s and a newline.  This
+caused the old version of m_getfld() to declare eom prematurely.  The
+fix was a lot slower than
+		c == '\001' && peekc (iob) == '\001'
+but it worked, and to increase generality, UUCP style maildrops could
+be parsed as well.  Unfortunately the speed issue finally caught up with
+us since this routine is at the very heart of MH.
+To speed things up considerably, the routine Eom() was made an auxilary
+function called by the macro eom().  Unless we are bursting a maildrop,
+the eom() macro returns FALSE saying we aren't at the end of the
+message.
+The next thing to do is to read the mtstailor file and initialize
+delimiter[] and delimlen accordingly...
+After mhl was made a built-in in msh, m_getfld() worked just fine
+(using m_unknown() at startup).  Until one day: a message which was
+the result of a bursting was shown. Then, since the burst boundaries
+aren't CTRL-A:s, m_getfld() would blinding plunge on past the boundary.
+Very sad.  The solution: introduce m_eomsbr().  This hook gets called
+after the end of each line (since testing for eom involves an fseek()).
+This worked fine, until one day: a message with no body portion arrived.
+Then the
+		   while (eom (c = Getc (iob), iob))
+			continue;
+loop caused m_getfld() to return FMTERR.  So, that logic was changed to
+check for (*eom_action) and act accordingly.
+This worked fine, until one day: someone didn't use four CTRL:A's as
+their delimiters.  So, the bullet got bit and we read mts.h and
+continue to struggle on.  It's not that bad though, since the only time
+the code gets executed is when inc (or msh) calls it, and both of these
+have already called mts_init().
+------------------------
+(Written by Van Jacobson for the mh6 m_getfld, January, 1986):
+This routine was accounting for 60% of the cpu time used by most mh
+programs.  I spent a bit of time tuning and it now accounts for <10%
+of the time used.  Like any heavily tuned routine, it's a bit
+complex and you want to be sure you understand everything that it's
+doing before you start hacking on it.  Let me try to emphasize
+that:  every line in this atrocity depends on every other line,
+sometimes in subtle ways.  You should understand it all, in detail,
+before trying to change any part.  If you do change it, test the
+result thoroughly (I use a hand-constructed test file that exercises
+all the ways a header name, header body, header continuation,
+header-body separator, body line and body eom can align themselves
+with respect to a buffer boundary).  "Minor" bugs in this routine
+result in garbaged or lost mail.
+If you hack on this and slow it down, I, my children and my
+children's children will curse you.
+This routine gets used on three different types of files: normal,
+single msg files, "packed" unix or mmdf mailboxs (when used by inc)
+and packed, directoried bulletin board files (when used by msh).
+The biggest impact of different file types is in "eom" testing.  The
+code has been carefully organized to test for eom at appropriate
+times and at no other times (since the check is quite expensive).
+I have tried to arrange things so that the eom check need only be
+done on entry to this routine.  Since an eom can only occur after a
+newline, this is easy to manage for header fields.  For the msg
+body, we try to efficiently search the input buffer to see if
+contains the eom delimiter.  If it does, we take up to the
+delimiter, otherwise we take everything in the buffer.  (The change
+to the body eom/copy processing produced the most noticeable
+performance difference, particularly for "inc" and "show".)
+There are three qualitatively different things this routine busts
+out of a message: field names, field text and msg bodies.  Field
+names are typically short (~8 char) and the loop that extracts them
+might terminate on a colon, newline or max width.  I considered
+using a Vax "scanc" to locate the end of the field followed by a
+"bcopy" but the routine call overhead on a Vax is too large for this
+to work on short names.  If Berkeley ever makes "inline" part of the
+C optimiser (so things like "scanc" turn into inline instructions) a
+change here would be worthwhile.
+Field text is typically 60 - 100 characters so there's (barely)
+a win in doing a routine call to something that does a "locc"
+followed by a "bmove".  About 30% of the fields have continuations
+(usually the 822 "received:" lines) and each continuation generates
+another routine call.  "Inline" would be a big win here, as well.
+Messages, as of this writing, seem to come in two flavors: small
+(~1K) and long (>2K).  Most messages have 400 - 600 bytes of headers
+so message bodies average at least a few hundred characters.
+Assuming your system uses reasonably sized stdio buffers (1K or
+more), this routine should be able to remove the body in large
+(>500 byte) chunks.  The makes the cost of a call to "bcopy"
+small but there is a premium on checking for the eom in packed
+maildrops.  The eom pattern is always a simple string so we can
+construct an efficient pattern matcher for it (e.g., a Vax "matchc"
+instruction).  Some thought went into recognizing the start of
+an eom that has been split across two buffers.
+This routine wants to deal with large chunks of data so, rather
+than "getc" into a local buffer, it uses stdio's buffer.  If
+you try to use it on a non-buffered file, you'll get what you
+deserve.  This routine "knows" that struct FILEs have a _ptr
+and a _cnt to describe the current state of the buffer and
+it knows that _filbuf ignores the _ptr & _cnt and simply fills
+the buffer.  If stdio on your system doesn't work this way, you
+may have to make small changes in this routine.
+This routine also "knows" that an EOF indication on a stream is
+"sticky" (i.e., you will keep getting EOF until you reposition the
+stream).  If your system doesn't work this way it is broken and you
+should complain to the vendor.  As a consequence of the sticky
+EOF, this routine will never return any kind of EOF status when
+there is data in "name" or "buf").
+*/
+#define Getc(iob)	getc(iob)
+#define eom(c,iob)	(msg_style != MS_DEFAULT && \
+			 (((c) == *msg_delim && m_Eom(c,iob)) ||\
+			  (eom_action && (*eom_action)(c))))
+static unsigned char *matchc();
+static unsigned char *locc();
+static unsigned char **pat_map;
+extern int msg_count;	/* defined in sbr/m_msgdef.c = 0
+			 * disgusting hack for "inc" so it can
+			 * know how many characters were stuffed
+			 * in the buffer on the last call (see
+			 * comments in uip/scansbr.c) */
+extern int msg_style;	/* defined in sbr/m_msgdef.c = MS_DEFAULT */
+/*
+* The "full" delimiter string for a packed maildrop consists
+* of a newline followed by the actual delimiter.  E.g., the
+* full string for a Unix maildrop would be: "\n\nFrom ".
+* "Fdelim" points to the start of the full string and is used
+* in the BODY case of the main routine to search the buffer for
+* a possible eom.  Msg_delim points to the first character of
+* the actual delim. string (i.e., fdelim+1).  Edelim
+* points to the 2nd character of actual delimiter string.  It
+* is used in m_Eom because the first character of the string
+* has been read and matched before m_Eom is called.
+*/
+extern char *msg_delim;	/*  defined in sbr/m_msgdef.c = "" */
+static unsigned char *fdelim;
+static unsigned char *delimend;
+static int  fdelimlen;
+static unsigned char *edelim;
+static int  edelimlen;
+#ifdef CONTENT_LENGTH
+static int content_length = -1;
+static long end_of_contents = -1;
+#endif
+static int  (*eom_action) () = NULL;
+#ifdef FILE__PTR
+#define _ptr  __ptr
+#define _cnt  __cnt
+#endif
+#ifdef _FSTDIO
+#define	_ptr	_p		/* Gag */
+#define	_cnt	_r		/* Retch */
+#define	_filbuf	__srget		/* Puke */
+#endif
+/*  */
+m_getfld (state, name, buf, bufsz, iob)
+int		state;
+int		bufsz;
+unsigned char	*name,
+		*buf;
+register FILE	*iob;
+{
+register unsigned char  *cp;
+register unsigned char  *bp;
+register unsigned char  *ep;
+register unsigned char  *sp;
+register int    cnt;
+register int    c;
+register int    i;
+register int    j;
+#ifdef CONTENT_LENGTH
+/*
+* When starting to read from a new file, we have to reset the state,
+* but only if the state wasn't reset.  That may save us a number of
+* lseeks.
+*/
+if (state == FLD &&
+	(content_length != -1 || end_of_contents != -1) &&
+	ftell(iob) == 0)
+	    end_of_contents = content_length = -1;
+#endif
+if ((c = Getc(iob)) < 0) {
+	msg_count = 0;
+	*buf = 0;
+	return FILEEOF;
+}
+if (eom (c, iob)) {
+	if (! eom_action) {
+	    /* flush null messages */
+	    while ((c = Getc(iob)) >= 0 && eom (c, iob))
+		;
+	    if (c >= 0)
+		(void) ungetc(c, iob);
+	}
+	msg_count = 0;
+	*buf = 0;
+	return FILEEOF;
+}
+switch (state) {
+	case FLDEOF:
+	case BODYEOF:
+	case FLD:
+	    if (c == '\n' || c == '-') {
+		/* we hit the header/body separator */
+		while (c != '\n' && (c = Getc(iob)) >= 0)
+		    ;
+#ifdef CONTENT_LENGTH
+		/*
+		 * When we've found a content-length header, we're
+		 * going to use it to tell where the message boundary
+		 * is, if it is a valid mesage boundary.
+		 * There can be a number of cases:
+		 * - no bytes after <content-length> bytes: the usual format
+		 *   of a message in an MH folder.
+		 * - only a newline - last message in mail drop.
+		 * - "\nFrom "	- beginning of next message
+		 * - other - ignore Content-Length header, but issue warning
+		 */
+		if (msg_style == MS_UUCP && content_length != -1) {
+		    long here = ftell(iob);
+		    static char delim[] = "\nFrom ";
+		    char buf[sizeof(delim)-1];
+		    int cnt;
+		    /* compute position of character after file */
+		    end_of_contents = here + content_length + 1;
+		    content_length = -1;
+		    /* And see whether this is a From header or eof. */
+		    fseek(iob, end_of_contents - 1, 0);
+		    cnt = fread(buf, sizeof(char), sizeof(buf), iob);
+		    if (cnt != 0 && (cnt != 1 || buf[0] != '\n') &&
+			(cnt != sizeof(buf) ||
+			  strncmp(buf,delim, sizeof(buf)) != 0)) {
+			    advise (NULLCP, "invalid Content-Length: header\n");
+			    end_of_contents = -1;
+		    }
+		    fseek(iob, here, 0);
+		}
+#endif
+		if (c < 0 || (c = Getc(iob)) < 0 || eom (c, iob)) {
+		    if (! eom_action) {
+			/* flush null messages */
+			while ((c = Getc(iob)) >= 0 && eom (c, iob))
+			    ;
+			if (c >= 0)
+			    (void) ungetc(c, iob);
+		    }
+		    msg_count = 0;
+		    *buf = 0;
+		    return FILEEOF;
+		}
+		state = BODY;
+		goto body;
+	    }
+	    /*
+	     * get the name of this component.  take characters up
+	     * to a ':', a newline or NAMESZ-1 characters, whichever
+	     * comes first.
+	     */
+	    cp = name; i = NAMESZ - 1;
+	    for (;;) {
+#ifdef _STDIO_USES_IOSTREAM
+		bp = sp = (unsigned char *) iob->_IO_read_ptr - 1;
+		j = (cnt = ((long) iob->_IO_read_end - (long) iob->_IO_read_ptr) + 1) < i?
+		    cnt: i;
+#else
+		bp = sp = (unsigned char *) iob->_ptr - 1;
+		j = (cnt = iob->_cnt+1) < i ? cnt : i;
+#endif
+		while (--j >= 0 && (c = *bp++) != ':' && c != '\n')
+		    *cp++ = c;
+		j = bp - sp;
+		if ((cnt -= j) <= 0) {
+#ifdef _STDIO_USES_IOSTREAM
+		    iob->_IO_read_ptr = iob->_IO_read_end;
+		    if (__underflow((struct _IO_FILE *) iob) == EOF) {
+#else
+#ifdef FILBUF_ADJ
+		    iob -> _ptr += iob -> _cnt;
+		    iob -> _cnt = 0;
+#endif /* FILBUF_ADJ */
+		    if (_filbuf(iob) == EOF) {
+#endif
+			*cp = *buf = 0;
+			advise (NULLCP, "eof encountered in field \"%s\"",
+				name);
+			return FMTERR;
+		    }
+#ifdef _STDIO_USES_IOSTREAM
+		    iob->_IO_read_ptr++; /* NOT automatic in __underflow()! */
+#endif
+		} else {
+#ifdef _STDIO_USES_IOSTREAM
+		    iob->_IO_read_ptr = bp + 1;
+#else
+		    iob->_ptr = bp + 1;
+		    iob->_cnt = cnt - 1;
+#endif
+		}
+		if (c == ':')
+		    break;
+		/*
+		 * something went wrong.  possibilities are:
+		 *  . hit a newline (error)
+		 *  . got more than namesz chars. (error)
+		 *  . hit the end of the buffer. (loop)
+		 */
+		if (c == '\n') {
+		    *cp = *buf = 0;
+		    advise (NULLCP, "eol encountered in field \"%s\"", name);
+		    state = FMTERR;
+		    goto finish;
+		}
+		if ((i -= j) <= 0) {
+		    *cp = *buf = 0;
+		    advise (NULLCP, "field name \"%s\" exceeds %d bytes",
+			    name, NAMESZ - 1);
+		    state = LENERR;
+		    goto finish;
+		}
+	    }
+	    while (isspace (*--cp) && cp >= name)
+		;
+	    *++cp = 0;
+	    /* fall through */
+	case FLDPLUS:
+	    /*
+	     * get (more of) the text of a field.  take
+	     * characters up to the end of this field (newline
+	     * followed by non-blank) or bufsz-1 characters.
+	     */
+	    cp = buf; i = bufsz-1;
+	    for (;;) {
+#ifdef _STDIO_USES_IOSTREAM
+		cnt = (long) iob->_IO_read_end - (long) iob->_IO_read_ptr;
+		bp = (unsigned char *) --iob->_IO_read_ptr;
+#else
+		cnt = iob->_cnt++; bp = (unsigned char *) --iob->_ptr;
+#endif
+		c = cnt < i ? cnt : i;
+		while (ep = locc( c, bp, '\n' )) {
+		    /*
+		     * if we hit the end of this field, return.
+		     */
+		    if ((j = *++ep) != ' ' && j != '\t') {
+#ifdef _STDIO_USES_IOSTREAM
+			j = ep - (unsigned char *) iob->_IO_read_ptr;
+			(void) bcopy( iob->_IO_read_ptr, cp, j);
+			iob->_IO_read_ptr = ep;
+#else
+			j = ep - (unsigned char *) iob->_ptr;
+			(void) bcopy( iob->_ptr, cp, j);
+			iob->_ptr = ep; iob->_cnt -= j;
+#endif
+			cp += j;
+			state = FLD;
+			goto finish;
+		    }
+		    c -= ep - bp; bp = ep;
+		}
+		/*
+		 * end of input or dest buffer - copy what we've found.
+		 */
+#ifdef _STDIO_USES_IOSTREAM
+		c += bp - (unsigned char *) iob->_IO_read_ptr;
+		(void) bcopy( iob->_IO_read_ptr, cp, c);
+#else
+		c += bp - (unsigned char *) iob->_ptr;
+		(void) bcopy( iob->_ptr, cp, c);
+#endif
+		i -= c; cp += c;
+		if (i <= 0) {
+		    /* the dest buffer is full */
+#ifdef _STDIO_USES_IOSTREAM
+		    iob->_IO_read_ptr += c;
+#else
+		    iob->_cnt -= c; iob->_ptr += c;
+#endif
+		    state = FLDPLUS;
+		    break;
+		}
+		/*
+		 * There's one character left in the input buffer.
+		 * Copy it & fill the buffer.  If the last char
+		 * was a newline and the next char is not whitespace,
+		 * this is the end of the field.  Otherwise loop.
+		 */
+		--i;
+#ifdef _STDIO_USES_IOSTREAM
+		*cp++ = j = *(iob->_IO_read_ptr + c);
+		iob->_IO_read_ptr = iob->_IO_read_end;
+		c = __underflow((struct _IO_FILE *) iob);
+		iob->_IO_read_ptr++;   /* NOT automatic! */
+#else
+		*cp++ = j = *(iob->_ptr + c);
+#ifdef FILBUF_ADJ
+		iob -> _ptr += iob -> _cnt;
+		iob -> _cnt = 0;
+#endif /* FILBUF_ADJ */
+		c = _filbuf(iob);
+#endif
+/* bugfix, 03/1998.
+* If we encounter EOF halfway through reading the value (ie there is
+* no trailing \n in the field) then __underflow() above returns EOF.
+* Previously we didn't check for this, with the result that we then
+* attempt to read from the stream and wind up segfaulting doing a
+* bcopy() with length parameter -1. Instead, we just append a newline
+* to what we've read, so the following conditional will pick it up
+* and return the field value. Then the EOF is actually dealt with
+* the next time this function is called.
+* The reason for appending \n is because the callers are known to
+* work with 'name: value\n', and setting j to '\n' is known to exit
+* in the right way, and the less we change the less likely
+* we are to introduce new bugs. And I'm scared of the curse in the
+* comments at the top of this file :->
+*     -- PMM (pmaydell@chiark.greenend.org.uk)
+*/
+		if (c == EOF && j != '\0' && j != '\n') {
+		    *cp++ = j = '\n';
+		    advise (NULLCP, "file missing final eol");
+}
+/* bugfix end */
+		if ((j == '\0' || j == '\n') && c != ' ' && c != '\t') {
+		    if (c != EOF)
+#ifdef _STDIO_USES_IOSTREAM
+			--iob->_IO_read_ptr;
+#else
+			--iob->_ptr, ++iob->_cnt;
+#endif
+		    state = FLD;
+		    break;
+		}
+	    }
+	    break;
+	case BODY:
+	body:
+	    /*
+	     * get the message body up to bufsz characters or the
+	     * end of the message.  Sleazy hack: if bufsz is negative
+	     * we assume that we were called to copy directly into
+	     * the output buffer and we don't add an eos.
+	     */
+	    i = (bufsz < 0) ? -bufsz : bufsz-1;
+#ifdef _STDIO_USES_IOSTREAM
+	    bp = (unsigned char *) --iob->_IO_read_ptr;
+	    cnt = (long) iob->_IO_read_end - (long) iob->_IO_read_ptr;
+#else
+	    bp = (unsigned char *) --iob->_ptr; cnt = ++iob->_cnt;
+#endif
+	    c = (cnt < i ? cnt : i);
+	    if (msg_style != MS_DEFAULT && c > 1) {
+		/*
+		 * packed maildrop - only take up to the (possible)
+		 * start of the next message.  This "matchc" should
+		 * probably be a Boyer-Moore matcher for non-vaxen,
+		 * particularly since we have the alignment table
+		 * all built for the end-of-buffer test (next).
+		 * But our vax timings indicate that the "matchc"
+		 * instruction is 50% faster than a carefully coded
+		 * B.M. matcher for most strings.  (So much for elegant
+		 * algorithms vs. brute force.)  Since I (currently)
+		 * run MH on a vax, we use the matchc instruction. --vj
+		 */
+		if (ep = matchc( fdelimlen, fdelim, c, bp ) )
+		    c = ep - bp + 1;
+		else {
+		    /*
+		     * There's no delim in the buffer but there may be
+		     * a partial one at the end.  If so, we want to leave
+		     * it so the "eom" check on the next call picks it up.
+		     * Use a modified Boyer-Moore matcher to make this
+		     * check relatively cheap.  The first "if" figures
+		     * out what position in the pattern matches the last
+		     * character in the buffer.  The inner "while" matches
+		     * the pattern against the buffer, backwards starting
+		     * at that position.  Note that unless the buffer
+		     * ends with one of the characters in the pattern
+		     * (excluding the first and last), we do only one test.
+		     */
+		    ep = bp + c - 1;
+		    if (sp = pat_map[*ep & 0x00ff]) {
+			do {
+			    cp = sp;
+			    while (*--ep == *--cp)
+			    ;
+			    if (cp < fdelim) {
+				if (ep >= bp)
+				    /*
+				     * ep < bp means that all the buffer
+				     * contains is a prefix of delim.
+				     * If this prefix is really a delim, the
+				     * m_eom call at entry should have found
+				     * it.  Thus it's not a delim and we can
+				     * take all of it.
+				     */
+				    c = (ep - bp) + 2;
+			    break;
+			}
+			    /* try matching one less char of delim string */
+			    ep = bp + c - 1;
+			} while (--sp > fdelim);
+		    }
+		}
+	    }
+	    (void) bcopy( bp, buf, c );
+#ifdef _STDIO_USES_IOSTREAM
+	    iob->_IO_read_ptr += c;
+#else
+	    iob->_cnt -= c;
+	    iob->_ptr += c;
+#endif
+	    if (bufsz < 0) {
+		msg_count = c;
+		return (state);
+	    }
+	    cp = buf + c;
+	    break;
+	default:
+	    adios (NULLCP, "m_getfld() called with bogus state of %d", state);
+}
+finish:;
+*cp = 0;
+msg_count = cp - buf;
+#ifdef CONTENT_LENGTH
+/* Check whether this was a Content-Length header */
+if (msg_style == MS_UUCP && state == FLD &&
+	    uleq((char*)"content-length", (char*) name)) {
+	content_length = atoi(buf);
+	/* This value is computed when end-of-headers is detected */
+	end_of_contents = -1;
+}
+#endif
+return (state);
+}
+/*  */
+#ifdef	RPATHS
+static char  unixbuf[BUFSIZ] = "";
+#endif /* RPATHS */
+void
+m_unknown(iob)
+	register FILE *iob;
+{
+register	int c;
+register	long pos;
+char	text[10];
+register    char *cp;
+register	char *delimstr;
+msg_style = MS_UNKNOWN;
+/* Figure out what the message delimitter string is for this
+* maildrop.  (This used to be part of m_Eom but I didn't like
+* the idea of an "if" statement that could only succeed on the
+* first call to m_Eom getting executed on each call, i.e., at
+* every newline in the message).
+*
+* If the first line of the maildrop is a Unix "from" line, we say the
+* style is UUCP and eat the rest of the line.  Otherwise we say the style
+* is MMDF & look for the delimiter string specified when MH was built
+* (or from the mtstailor file).
+*/
+pos = ftell (iob);
+if (fread (text, sizeof *text, 5, iob) == 5
+	    && strncmp (text, "From ", 5) == 0) {
+	msg_style = MS_UUCP;
+	delimstr = "\nFrom ";
+#ifndef	RPATHS
+	while ((c = getc (iob)) != '\n' && c >= 0)
+	    ;
+#else /* RPATHS */
+	cp = unixbuf;
+	while ((c = getc (iob)) != '\n')
+	    *cp++ = c;
+	*cp = 0;
+#endif /* RPATHS */
+} else {
+	/* not a Unix style maildrop */
+	(void) fseek (iob, pos, 0);
+	if (mmdlm2 == NULLCP || *mmdlm2 == 0)
+	    mmdlm2 = "\001\001\001\001\n";
+	delimstr = mmdlm2;
+	msg_style = MS_MMDF;
+}
+c = strlen (delimstr);
+fdelim = (unsigned char *)malloc((unsigned)c + 3);
+*fdelim++ = '\0';
+*fdelim = '\n';
+msg_delim = (char *)fdelim+1;
+edelim = (unsigned char *)msg_delim+1;
+fdelimlen = c + 1;
+edelimlen = c - 1;
+(void)strcpy(msg_delim, delimstr);
+delimend = (unsigned char *)msg_delim + edelimlen;
+if (edelimlen <= 1)
+	adios (NULLCP, "maildrop delimiter must be at least 2 bytes");
+/*
+* build a Boyer-Moore end-position map for the matcher in m_getfld.
+* N.B. - we don't match just the first char (since it's the newline
+* separator) or the last char (since the matchc would have found it
+* if it was a real delim).
+*/
+pat_map = (unsigned char **) calloc (256, sizeof (unsigned char *));
+for (cp = (char *)fdelim + 1; cp < (char *)delimend; cp++ )
+	pat_map[*cp] = (unsigned char *)cp;
+if (msg_style == MS_MMDF) {
+	/* flush extra msg hdrs */
+	while ((c = Getc(iob)) >= 0 && eom (c, iob))
+	    ;
+	if (c >= 0)
+	    (void) ungetc(c, iob);
+}
+}
+void m_eomsbr (action)
+int     (*action) ();
+{
+if (eom_action = action) {
+	msg_style = MS_MSH;
+	*msg_delim = 0;
+	fdelimlen = 1;
+	delimend = fdelim;
+} else {
+	msg_style = MS_MMDF;
+	msg_delim = (char *)fdelim + 1;
+	fdelimlen = strlen((char *)fdelim);
+	delimend = (unsigned char *)(msg_delim + edelimlen);
+}
+}
+/*  */
+/* test for msg delimiter string */
+int  m_Eom (c, iob)
+register int     c;
+register FILE   *iob;
+{
+register long pos = 0L;
+register int i;
+char    text[10];
+#ifdef	RPATHS
+register    char *cp;
+#endif /* RPATHS */
+pos = ftell (iob);
+#ifdef CONTENT_LENGTH
+if (msg_style == MS_UUCP && end_of_contents != -1) {
+	if (end_of_contents == pos) {
+	    end_of_contents = -1;
+	    if ((fread (text, sizeof *text, edelimlen, iob) == edelimlen)
+		    && (strncmp (text, (char *)edelim, edelimlen) == 0)) {
+#ifndef	RPATHS
+		while ((c = getc (iob)) != '\n')
+		    if (c < 0)
+			break;
+#else /* RPATHS */
+		cp = unixbuf;
+		while ((c = getc (iob)) != '\n' && c >= 0)
+		    *cp++ = c;
+		*cp = 0;
+#endif /* RPATHS */
+	    }
+	    return 1;
+	}
+	/* we've read past the end of a message, this should never happen
+	 * because of the other checks we do */
+	if (end_of_contents < pos) {
+	    end_of_contents = -1;
+	    adios(NULLCP,
+		    "Content-Length: header broken, can't read mailbox\n");
+	}
+	return 0;
+}
+#endif
+if ((i = fread (text, sizeof *text, edelimlen, iob)) != edelimlen
+	    || strncmp (text, (char *)edelim, edelimlen)) {
+	if (i == 0 && msg_style == MS_UUCP)
+	    /* the final newline in the (brain damaged) unix-format
+	     * maildrop is part of the delimitter - delete it.
+	     */
+	    return 1;
+#ifdef	notdef
+	(void) fseek (iob, pos, 0);
+#else
+	(void) fseek (iob, (long)(pos-1), 0);
+	(void) getc (iob);		/* should be OK */
+#endif /* !notdef */
+	return 0;
+}
+#ifdef CONTENT_LENGTH
+/* There's one extra special case to be considered here:
+* content_length > 0.  That we got here is because the
+* message body starts with "From "
+*/
+if (msg_style == MS_UUCP && content_length > 0) {
+	(void) fseek (iob, (long)(pos-1), 0);
+	(void) getc (iob);		/* should be OK */
+	return 0;
+}
+#endif
+if (msg_style == MS_UUCP) {
+#ifndef	RPATHS
+	while ((c = getc (iob)) != '\n')
+	    if (c < 0)
+		break;
+#else /* RPATHS */
+	cp = unixbuf;
+	while ((c = getc (iob)) != '\n' && c >= 0)
+	    *cp++ = c;
+	*cp = 0;
+#endif /* RPATHS */
+}
+return 1;
+}
+/*  */
+#ifdef	RPATHS
+char   *unixline () {
+register char  *cp,
+*dp,
+*pp;
+static char unixfrom[BUFSIZ];
+int i;
+pp = unixfrom;
+if (cp = dp = index (unixbuf, ' ')) {
+	while (cp = index (cp + 1, 'r'))
+	    if (strncmp (cp, "remote from ", 12) == 0) {
+		*cp = 0;
+		(void) sprintf (pp, "%s!", cp + 12);
+		pp += strlen (pp);
+		break;
+	    }
+	if (cp == NULL)
+	    cp = unixbuf + strlen (unixbuf);
+#if 0
+	if ((cp -= 25) >= dp)
+#else
+	/* On most of BSD systems, the date field length of UNIX From line
+	   is 25, but it's not suitable for other systems.  We should not
+	   use this length. */
+	while (cp > dp && *--cp != ':')
+	    ;
+	for (i = 0; i < 4 && cp > dp; i++) {
+	    while (!isspace(*--cp))
+		;
+	    while (isspace(*(cp - 1)))
+		--cp;
+	}
+	if (cp >= dp)
+#endif
+	    *cp = 0;
+}
+(void) sprintf (pp, "%s\n", unixbuf);
+unixbuf[0] = 0;
+return unixfrom;
+}
+#endif /* RPATHS */
+/*  */
+/* matchc: find the first occurrence of string pat in string str.
+* We can't use the C library routine strstr because the string
+* won't have a trailing NUL. See also the note about using a
+* Boyer-Moore search on non-Vaxen (in the only place this fn
+* is used...)
+*/
+#if (vax && !lint)
+	asm(".align 1");
+	asm("_matchc: .word 0");
+	asm("	movq 4(ap),r0");
+	asm("	movq 12(ap),r2");
+	asm("	matchc  r0,(r1),r2,(r3)");
+	asm("	beql 1f");
+	asm("	movl 4(ap),r3");
+	asm("1:	subl3  4(ap),r3,r0");
+	asm("	ret");
+#else
+static unsigned char *
+matchc( patln, pat, strln, str )
+	int patln;
+	char *pat;
+	int strln;
+	register char *str;
+{
+	register char *es = str + strln - patln;
+	register char *sp;
+	register char *pp;
+	register char *ep = pat + patln;
+	register char pc = *pat++;
+	/* es is a pointer to the last character we need to
+	 * check (the pattern can't start beyond it because then
+	 * the end of the pattern would be beyond the end of the
+	 * string).
+	 */
+	for(;;) {
+	  /* Search for the next occurrence of pc (first character
+	   * in the pattern.
+	   */
+		do {
+			if (str > es)
+				return 0;
+		} while (pc != *str++);
+		/* At this point we have a match for the first
+		 * character and basically do a strcmp() for the
+		 * rest of the pattern. We know that the pattern
+		 * will fit in the remainder of the string because
+		 * of the es check.
+		 */
+		sp = str; pp = pat;
+		while (pp < ep && *sp++ == *pp)
+			pp++;
+		if (pp >= ep)	/* whole pattern matched? */
+			return ((unsigned char *)--str);
+		/* If we get this far then it wasn't a good match,
+		 * so go back to looking for the first character in
+* the pattern.
+		 */
+	}
+}
+#endif
+/*  */
+/*
+* Locate character "term" in the next "cnt" characters of "src".
+* If found, return its address, otherwise return 0.
+*/
+#if (vax && !lint)
+	asm(".align 1");
+	asm("_locc: .word 0");
+	asm("	movq  4(ap),r0");
+	asm("	locc  12(ap),r0,(r1)");
+	asm("	beql  1f");
+	asm("	movl  r1,r0");
+	asm("1:	ret");
+#else
+static unsigned char *
+locc( cnt, src, term )
+	register int  cnt;
+	register unsigned char *src;
+	register unsigned char term;
+{
+while (*src++ != term && --cnt > 0);
+return (cnt > 0 ? --src : (unsigned char *)0);
+}
+#endif
+/*  */
+#if	!defined (BSD42) && !defined (bcopy)
+int	bcmp (b1, b2, length)
+register char *b1,
+	      *b2;
+register int   length;
+{
+while (length-- > 0)
+	if (*b1++ != *b2++)
+	    return 1;
+return 0;
+}
+bcopy (b1, b2, length)
+register char *b1,
+	      *b2;
+register int   length;
+{
+while (length-- > 0)
+	*b2++ = *b1++;
+}
+bzero (b, length)
+register char *b;
+register int   length;
+{
+while (length-- > 0)
+	*b++ = 0;
+}
+#endif /* not BSD42 */

Mercurial > hg > Applications > mh

comparison sbr/m_getfld.c @ 0:bce86c4163a3