home *** CD-ROM | disk | FTP | other *** search
- /*
- * L E X . C
- *
- * EE/CIS Computer Lab
- * Department of Computer and Information Sciences
- * Department of Electrical Engineering
- * University of Delaware
- *
- * REVISION HISTORY:
- *
- * $Revision: 1.5 $
- *
- * $Log: lex.c,v $
- * Revision 1.5 86/01/14 16:15:18 galvin
- * Change the "mmdf.h" include line.
- *
- * Revision 1.4 85/11/18 16:09:27 galvin
- * Change name of command table to CmdTab so as not
- * to conflict with cmdtab of MMDF.
- *
- * Revision 1.3 85/11/18 14:34:21 galvin
- * Teach setfile how to MMDF lock files.
- * Have it use the access system call rather than opening and closing files.
- *
- * Revision 1.2 85/11/18 12:35:29 galvin
- * Added comment header for revision history.
- *
- *
- */
-
- /*
- * Copyright (c) 1980 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- */
-
- #ifndef lint
- static char *sccsid = "@(#)lex.c 5.4 (Berkeley) 11/2/85";
- #endif not lint
-
- #include "./rcv.h"
- #include "./mmdf.h"
- #include <sys/file.h>
- #include <sys/stat.h>
- #include <errno.h>
-
- /*
- * Mail -- a mail program
- *
- * Lexical processing of commands.
- */
-
- char *prompt = "& ";
-
- /*
- * Set up editing on the given file name.
- * If isedit is true, we are considered to be editing the file,
- * otherwise we are reading our mail which has signficance for
- * mbox and so forth.
- */
-
- setfile(name, isedit)
- char *name;
- {
- FILE *ibuf;
- struct stat stb;
- static int shudclob;
- static char efile[128];
- extern char tempMesg[];
-
- if ((ibuf = lk_fopen(name, "r", (char *)0, (char *)0, 5)) == NULL)
- return(-1);
- if (!edit) {
- if (fstat(fileno(ibuf), &stb) < 0) {
- perror(name);
- exit(1);
- }
- if (stb.st_size == 0) {
- lk_fclose(ibuf, name, (char *)0, (char *)0);
- return(-1);
- }
- }
-
- /*
- * Looks like all will be well. We must now relinquish our
- * hold on the current set of stuff. Must hold signals
- * while we are reading the new file, else we will ruin
- * the message[] data structure.
- */
-
- holdsigs();
- if (shudclob)
- if (edit)
- edstop();
- else
- quit();
-
- /*
- * Copy the messages into /tmp
- * and set pointers.
- */
-
- readonly = 0;
- if (access(name, 2) < 0)
- readonly++;
- if (shudclob) {
- fclose(itf);
- fclose(otf);
- }
- shudclob = 1;
- edit = isedit;
- strncpy(efile, name, 128);
- editfile = efile;
- if (name != mailname)
- strcpy(mailname, name);
- mailsize = fsize(ibuf);
- if ((otf = fopen(tempMesg, "w")) == NULL) {
- perror(tempMesg);
- lk_fclose(ibuf, name, (char *) 0, (char *) 0);
- exit(1);
- }
- if ((itf = fopen(tempMesg, "r")) == NULL) {
- perror(tempMesg);
- lk_fclose(ibuf, name, (char *) 0, (char *) 0);
- exit(1);
- }
- remove(tempMesg);
- setptr(ibuf);
- setmsize(msgCount);
- lk_fclose(ibuf, name, (char *)0, (char *)0);
- relsesigs();
- sawcom = 0;
- return(0);
- }
-
- /*
- * Interpret user commands one by one. If standard input is not a tty,
- * print no prompt.
- */
-
- int *msgvec;
-
- commands()
- {
- int eofloop, shudprompt, stop();
- register int n;
- char linebuf[LINESIZE];
- int hangup(), contin();
-
- # ifdef VMUNIX
- sigset(SIGCONT, SIG_DFL);
- # endif VMUNIX
- if (rcvmode && !sourcing) {
- if (sigset(SIGINT, SIG_IGN) != SIG_IGN)
- sigset(SIGINT, stop);
- if (sigset(SIGHUP, SIG_IGN) != SIG_IGN)
- sigset(SIGHUP, hangup);
- }
- shudprompt = intty && !sourcing;
- for (;;) {
- setexit();
-
- /*
- * Print the prompt, if needed. Clear out
- * string space, and flush the output.
- */
-
- if (!rcvmode && !sourcing)
- return;
- eofloop = 0;
- top:
- if (shudprompt) {
- printf(prompt);
- fflush(stdout);
- # ifdef VMUNIX
- sigset(SIGCONT, contin);
- # endif VMUNIX
- } else
- fflush(stdout);
- 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 (loading)
- return;
- if (sourcing) {
- unstack();
- goto more;
- }
- if (value("ignoreeof") != NOSTR && shudprompt) {
- if (++eofloop < 25) {
- printf("Use \"quit\" to quit.\n");
- goto top;
- }
- }
- if (edit)
- edstop();
- return;
- }
- if ((n = strlen(linebuf)) == 0)
- break;
- n--;
- if (linebuf[n] != '\\')
- break;
- linebuf[n++] = ' ';
- }
- # ifdef VMUNIX
- sigset(SIGCONT, SIG_DFL);
- # endif VMUNIX
- if (execute(linebuf, 0))
- 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.
- * Contxt is non-zero if called while composing mail.
- */
-
- execute(linebuf, contxt)
- char linebuf[];
- {
- char word[LINESIZE];
- char *arglist[MAXARGC];
- struct cmd *com;
- register char *cp, *cp2;
- register int c;
- int muvec[2];
- 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("Unknown command: \"%s\"\n", word);
- if (loading)
- return(1);
- if (sourcing)
- unstack();
- return(0);
- }
-
- /*
- * See if we should execute the command -- if a conditional
- * we always execute it, otherwise, check the state of cond.
- */
-
- if ((com->c_argtype & F) == 0)
- if (cond == CRCV && !rcvmode || cond == CSEND && rcvmode)
- 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) {
- if (loading)
- return(1);
- unstack();
- return(0);
- }
- if (!edit && com->c_func == edstop) {
- sigset(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);
- if (loading)
- return(1);
- if (sourcing)
- unstack();
- return(0);
- }
- if (sourcing && com->c_argtype & I) {
- printf("May not execute \"%s\" while sourcing\n",
- com->c_name);
- if (loading)
- return(1);
- unstack();
- return(0);
- }
- if (readonly && com->c_argtype & W) {
- printf("May not execute \"%s\" -- message file is read only\n",
- com->c_name);
- if (loading)
- return(1);
- if (sourcing)
- unstack();
- return(0);
- }
- if (contxt && com->c_argtype & R) {
- printf("Cannot recursively invoke \"%s\"\n", com->c_name);
- return(0);
- }
- e = 1;
- switch (com->c_argtype & ~(F|P|I|M|T|W|R)) {
- case MSGLIST:
- /*
- * A message list defaulting to nearest forward
- * legal message.
- */
- if (msgvec == 0) {
- printf("Illegal use of \"message list\"\n");
- return(-1);
- }
- 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 (msgvec == 0) {
- printf("Illegal use of \"message list\"\n");
- return(-1);
- }
- 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,
- sizeof arglist / sizeof *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 && loading)
- return(1);
- 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) {
- muvec[0] = dot - &message[0] + 1;
- muvec[1] = 0;
- type(muvec);
- }
- if (!sourcing && (com->c_argtype & T) == 0)
- sawcom = 1;
- return(0);
- }
-
- /*
- * When we wake up after ^Z, reprint the prompt.
- */
- contin()
- {
-
- printf(prompt);
- fflush(stdout);
- }
-
- /*
- * Branch here on hangup signal and simulate quit.
- */
- hangup()
- {
-
- holdsigs();
- if (edit) {
- if (setexit())
- exit(0);
- edstop();
- }
- else
- quit();
- exit(0);
- }
-
- /*
- * Set the size of the message vector used to construct argument
- * lists to message list functions.
- */
-
- setmsize(sz)
- {
-
- if (msgvec != (int *) 0)
- cfree((char *) msgvec);
- msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec);
- }
-
- /*
- * 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.
- */
-
- int inithdr; /* am printing startup headers */
-
- #ifdef _NFILE
- static
- _fwalk(function)
- register int (*function)();
- {
- register FILE *iop;
-
- for (iop = _iob; iop < _iob + _NFILE; iop++)
- (*function)(iop);
- }
- #endif
-
- static
- xclose(iop)
- register FILE *iop;
- {
- if (iop == stdin || iop == stdout ||
- iop == stderr || iop == itf || iop == otf)
- return;
-
- if (iop != pipef)
- fclose(iop);
- else {
- pclose(pipef);
- pipef = NULL;
- }
- }
-
- #ifndef VMUNIX
- stop(s)
- #else VMUNIX
- stop()
- #endif VMUNIX
- {
-
- # ifndef VMUNIX
- s = SIGINT;
- # endif VMUNIX
- noreset = 0;
- if (!inithdr)
- sawcom++;
- inithdr = 0;
- while (sourcing)
- unstack();
- getuserid((char *) -1);
-
-
- /*
- * Before we go closing all them open FILEs, we need to
- * kill off our friendly neighborhood submit process.
- */
- ml_end(OK);
- /*
- * Walk through all the open FILEs, applying xclose() to them
- */
- _fwalk(xclose);
-
- if (image >= 0) {
- close(image);
- image = -1;
- }
- fprintf(stderr, "Interrupt\n");
- # ifndef VMUNIX
- signal(s, stop);
- # endif
- reset(0);
- }
-
- /*
- * Announce the presence of the current Mail version,
- * give the message count, and print a header listing.
- */
-
- char *greeting = "Mail version %s. Type ? for help.\n";
-
- announce(pr)
- {
- int vec[2], mdot;
- extern char *version;
-
- if (pr && value("quiet") == NOSTR)
- printf(greeting, version);
- mdot = newfileinfo();
- vec[0] = mdot;
- vec[1] = 0;
- dot = &message[mdot - 1];
- if (msgCount > 0 && !noheader) {
- inithdr++;
- headers(vec);
- inithdr = 0;
- }
- }
-
- /*
- * Announce information about the file we are editing.
- * Return a likely place to set dot.
- */
- newfileinfo()
- {
- register struct message *mp;
- register int u, n, mdot, d, s;
- char fname[BUFSIZ], zname[BUFSIZ], *ename;
-
- for (mp = &message[0]; mp < &message[msgCount]; mp++)
- if (mp->m_flag & MNEW)
- break;
- if (mp >= &message[msgCount])
- for (mp = &message[0]; mp < &message[msgCount]; mp++)
- if ((mp->m_flag & MREAD) == 0)
- break;
- if (mp < &message[msgCount])
- mdot = mp - &message[0] + 1;
- else
- mdot = 1;
- s = d = 0;
- for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) {
- if (mp->m_flag & MNEW)
- n++;
- if ((mp->m_flag & MREAD) == 0)
- u++;
- if (mp->m_flag & MDELETED)
- d++;
- if (mp->m_flag & MSAVED)
- s++;
- }
- ename = mailname;
- if (getfold(fname) >= 0) {
- strcat(fname, "/");
- if (strncmp(fname, mailname, strlen(fname)) == 0) {
- sprintf(zname, "+%s", mailname + strlen(fname));
- ename = zname;
- }
- }
- printf("\"%s\": ", ename);
- if (msgCount == 1)
- printf("1 message");
- else
- printf("%d messages", msgCount);
- if (n > 0)
- printf(" %d new", n);
- if (u-n > 0)
- printf(" %d unread", u);
- if (d > 0)
- printf(" %d deleted", d);
- if (s > 0)
- printf(" %d saved", s);
- if (readonly)
- printf(" [Read only]");
- printf("\n");
- return(mdot);
- }
-
- /*
- * Print the current version number.
- */
-
- pversion()
- {
- printf("Version %s\n", version);
- return(0);
- }
-
- /*
- * Load a file of user definitions.
- */
- load(name)
- char *name;
- {
- register FILE *in, *oldin;
-
- if ((in = fopen(name, "r")) == NULL)
- return;
- oldin = input;
- input = in;
- loading = 1;
- sourcing = 1;
- commands();
- loading = 0;
- sourcing = 0;
- input = oldin;
- fclose(in);
- }
-