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- /*
- * 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
- char *copyright =
- "@(#) Copyright (c) 1980 Regents of the University of California.\n\
- All rights reserved.\n";
- #endif not lint
-
- #ifndef lint
- static char *sccsid = "@(#)ex.c 7.6 (Berkeley) 3/9/87; 1.2 (Bellcore) 87/04/24";
- #endif not lint
-
- #include "ex.h"
- #include "ex_argv.h"
- #include "ex_temp.h"
- #include "ex_tty.h"
-
- #ifdef TRACE
- #ifdef vms
- char tttrace[] = { 't','r','a','c','e','.','l','i','s' };
- #else
- char tttrace[] = { '/','d','e','v','/','t','t','y','x','x',0 };
- #endif
- #endif
-
- /*
- * The code for ex is divided as follows:
- *
- * ex.c Entry point and routines handling interrupt, hangup
- * signals; initialization code.
- *
- * ex_addr.c Address parsing routines for command mode decoding.
- * Routines to set and check address ranges on commands.
- *
- * ex_cmds.c Command mode command decoding.
- *
- * ex_cmds2.c Subroutines for command decoding and processing of
- * file names in the argument list. Routines to print
- * messages and reset state when errors occur.
- *
- * ex_cmdsub.c Subroutines which implement command mode functions
- * such as append, delete, join.
- *
- * ex_data.c Initialization of options.
- *
- * ex_get.c Command mode input routines.
- *
- * ex_io.c General input/output processing: file i/o, unix
- * escapes, filtering, source commands, preserving
- * and recovering.
- *
- * ex_put.c Terminal driving and optimizing routines for low-level
- * output (cursor-positioning); output line formatting
- * routines.
- *
- * ex_re.c Global commands, substitute, regular expression
- * compilation and execution.
- *
- * ex_set.c The set command.
- *
- * ex_subr.c Loads of miscellaneous subroutines.
- *
- * ex_temp.c Editor buffer routines for main buffer and also
- * for named buffers (Q registers if you will.)
- *
- * ex_tty.c Terminal dependent initializations from termcap
- * data base, grabbing of tty modes (at beginning
- * and after escapes).
- *
- * ex_unix.c Routines for the ! command and its variations.
- *
- * ex_v*.c Visual/open mode routines... see ex_v.c for a
- * guide to the overall organization.
- */
-
- /*
- * Main procedure. Process arguments and then
- * transfer control to the main command processing loop
- * in the routine commands. We are entered as either "ex", "edit", "vi"
- * or "view" and the distinction is made here. Actually, we are "vi" if
- * there is a 'v' in our name, "view" is there is a 'w', and "edit" if
- * there is a 'd' in our name. For edit we just diddle options;
- * for vi we actually force an early visual command.
- */
- main(ac, av)
- register int ac;
- register char *av[];
- {
- #ifdef EXSTRINGS
- char *erpath = EXSTRINGS;
- #endif
- register char *cp;
- register int c;
- bool recov = 0;
- bool ivis;
- bool itag = 0;
- bool fast = 0;
- extern int onemt();
- #ifdef UNIX_SBRK
- extern char *sbrk();
- #else
- extern char *malloc();
- #endif
- #ifdef TRACE
- register char *tracef;
- #endif
- #ifdef vms
- char termtype[20];
- #endif
-
- /*
- * Immediately grab the tty modes so that we wont
- * get messed up if an interrupt comes in quickly.
- */
- ex_gTTY(1);
- #ifndef USG3TTY
- normf = tty.sg_flags;
- #else
- normf = tty;
- #endif
- ppid = getpid();
- /*
- * Defend against d's, v's, w's, and a's in directories of
- * path leading to our true name.
- */
- #ifndef vms
- av[0] = tailpath(av[0]);
- #else
- /*
- * This program has to be invoked by using the following
- * string definitions:
- *
- * vi == "$dir:ex.exe vi"
- * view == "$dir:ex.exe view"
- * ex == "$dir:ex.exe ex"
- * edit == "$dir:ex.exe edit"
- */
- ac--;
- av++;
- #endif
-
- /*
- * Figure out how we were invoked: ex, edit, vi, view.
- */
- ivis = any('v', av[0]); /* "vi" */
- if (any('w', av[0])) /* "view" */
- value(READONLY) = 1;
- if (any('d', av[0])) { /* "edit" */
- value(OPEN) = 0;
- value(REPORT) = 1;
- value(MAGIC) = 0;
- }
-
- #ifdef EXSTRINGS
- /*
- * For debugging take files out of . if name is a.out.
- */
- if (av[0][0] == 'a')
- erpath = tailpath(erpath);
- #endif
- /*
- * Open the error message file.
- */
- draino();
- #ifdef EXSTRINGS
- erfile = open(erpath+4, 0);
- if (erfile < 0) {
- erfile = open(erpath, 0);
- }
- #endif
- pstop();
-
- /*
- * Initialize interrupt handling.
- */
- oldhup = signal(SIGHUP, SIG_IGN);
- if (oldhup == SIG_DFL)
- signal(SIGHUP, onhup);
- oldquit = signal(SIGQUIT, SIG_IGN);
- ruptible = signal(SIGINT, SIG_IGN) == SIG_DFL;
- if (signal(SIGTERM, SIG_IGN) == SIG_DFL)
- signal(SIGTERM, onhup);
- if (signal(SIGEMT, SIG_IGN) == SIG_DFL)
- signal(SIGEMT, onemt);
-
- /*
- * Process flag arguments.
- */
- ac--, av++;
- while (ac && av[0][0] == '-') {
- c = av[0][1];
- if (c == 0) {
- hush = 1;
- value(AUTOPRINT) = 0;
- fast++;
- } else switch (c) {
-
- case 'R':
- value(READONLY) = 1;
- break;
-
- #ifdef TRACE
- case 'T':
- if (av[0][2] == 0)
- tracef = "trace";
- else {
- tracef = tttrace;
- tracef[8] = av[0][2];
- if (tracef[8])
- tracef[9] = av[0][3];
- else
- tracef[9] = 0;
- }
- trace = fopen(tracef, "w");
- #define tracbuf NULL
- if (trace == NULL)
- ex_printf("Trace create error\n");
- else
- setbuf(trace, tracbuf);
- break;
-
- #endif
-
- #ifdef LISPCODE
- case 'l':
- value(LISP) = 1;
- value(SHOWMATCH) = 1;
- break;
- #endif
-
- case 'r':
- recov++;
- break;
-
- case 't':
- if (ac > 1 && av[1][0] != '-') {
- ac--, av++;
- itag = 1;
- /* BUG: should check for too long tag. */
- CP(lasttag, av[0]);
- }
- break;
-
- case 'v':
- ivis = 1;
- break;
-
- case 'w':
- defwind = 0;
- if (av[0][2] == 0) defwind = 3;
- else for (cp = &av[0][2]; isdigit(*cp); cp++)
- defwind = 10*defwind + *cp - '0';
- break;
-
- #ifdef CRYPT
- case 'x':
- /* -x: encrypted mode */
- xflag = 1;
- break;
- #endif
-
- default:
- smerror("Unknown option %s\n", av[0]);
- break;
- }
- ac--, av++;
- }
-
- #ifdef SIGTSTP
- if (!hush && signal(SIGTSTP, SIG_IGN) == SIG_DFL)
- signal(SIGTSTP, onsusp), dosusp++;
- #endif
-
- if (ac && av[0][0] == '+') {
- firstpat = &av[0][1];
- ac--, av++;
- }
-
- #ifdef CRYPT
- if(xflag){
- key = getpass(KEYPROMPT);
- kflag = crinit(key, perm);
- }
- #endif
-
- /*
- * If we are doing a recover and no filename
- * was given, then execute an exrecover command with
- * the -r option to type out the list of saved file names.
- * Otherwise set the remembered file name to the first argument
- * file name so the "recover" initial command will find it.
- */
- if (recov) {
- if (ac == 0) {
- ppid = 0;
- setrupt();
- execl(EXRECOVER, "exrecover", "-r", 0);
- filioerr(EXRECOVER);
- ex_exit(1);
- }
- CP(savedfile, *av++), ac--;
- }
-
- /*
- * Initialize the argument list.
- */
- argv0 = av;
- argc0 = ac;
- args0 = av[0];
- erewind();
-
- /*
- * Initialize a temporary file (buffer) and
- * set up terminal environment. Read user startup commands.
- */
- if (setexit() == 0) {
- setrupt();
- intty = isatty(0);
- value(PROMPT) = intty;
- #ifndef vms
- if (cp = getenv("SHELL"))
- #else
- if (cp = getlog("SHELL"))
- #endif
- CP(shell, cp);
- if (fast || !intty)
- setterm("dumb");
- else {
- gettmode();
- #ifndef vms
- if ((cp = getenv("TERM")) != 0 && *cp)
- setterm(cp);
- #else
- if ((cp = getlog("TERM")) != 0 && *cp) {
- /*
- * Can't just use it directly since getlog
- * returns a pointer to a static buffer that
- * tgetent() will eventually use
- */
- CP(termtype, cp);
- setterm(termtype);
- }
- #endif
- }
- }
- if (setexit() == 0 && !fast && intty) {
- #ifndef vms
- if ((globp = getenv("EXINIT")) && *globp)
- #else
- if ((globp = getlog("EXINIT")) && *globp)
- #endif
- commands(1,1);
- else {
- globp = 0;
- if ((cp = getenv("HOME")) != 0 && *cp) {
- (void) strcat(strcpy(genbuf, cp), "/.exrc");
- if (iownit(genbuf))
- source(genbuf, 1);
- }
- }
- /*
- * Allow local .exrc too. This loses if . is $HOME,
- * but nobody should notice unless they do stupid things
- * like putting a version command in .exrc. Besides,
- * they should be using EXINIT, not .exrc, right?
- */
- if (iownit(".exrc"))
- source(".exrc", 1);
- }
- #ifdef UNIX_SBRK
- /*
- * Initialize end of core pointers.
- * Normally we avoid breaking back to fendcore after each
- * file since this can be expensive (much core-core copying).
- * If your system can scatter load processes you could do
- * this as ed does, saving a little core, but it will probably
- * not often make much difference.
- */
- fendcore = (line *) sbrk(0);
- endcore = fendcore - 2;
- #else
- /*
- * Allocate all the memory we will ever use in one chunk.
- * This is for system such as VMS where sbrk() does not
- * guarantee that the memory allocated beyond the end is
- * consecutive. VMS's RMS does all sorts of memory allocation
- * and screwed up ex royally because ex assumes that all
- * memory up to "endcore" belongs to it and RMS has different
- * ideas.
- */
- fendcore = (line *) malloc((unsigned)
- value(LINELIMIT) * sizeof (line *));
- if (fendcore == NULL) {
- lprintf("ex: cannot handle %d lines\n", value(LINELIMIT));
- lprintf("ex: set \"linelimit\" lower\n");
- flush();
- ex_exit(1);
- }
- endcore = fendcore + (value(LINELIMIT) - 1);
- #endif
- init(); /* moved after prev 2 chunks to fix directory option */
-
- /*
- * Initial processing. Handle tag, recover, and file argument
- * implied next commands. If going in as 'vi', then don't do
- * anything, just set initev so we will do it later (from within
- * visual).
- */
- if (setexit() == 0) {
- if (recov)
- globp = "recover";
- else if (itag)
- globp = ivis ? "tag" : "tag|p";
- else if (argc)
- globp = "next";
- if (ivis)
- initev = globp;
- else if (globp) {
- inglobal = 1;
- commands(1, 1);
- inglobal = 0;
- }
- }
-
- /*
- * Vi command... go into visual.
- * Strange... everything in vi usually happens
- * before we ever "start".
- */
- if (ivis) {
- /*
- * Don't have to be upward compatible with stupidity
- * of starting editing at line $.
- */
- if (dol > zero)
- dot = one;
- globp = "visual";
- if (setexit() == 0)
- commands(1, 1);
- }
-
- /*
- * Clear out trash in state accumulated by startup,
- * and then do the main command loop for a normal edit.
- * If you quit out of a 'vi' command by doing Q or ^\,
- * you also fall through to here.
- */
- seenprompt = 1;
- ungetchar(0);
- globp = 0;
- initev = 0;
- setlastchar('\n');
- setexit();
- commands(0, 0);
- cleanup(1);
- ex_exit(0);
- }
-
- /*
- * Initialization, before editing a new file.
- * Main thing here is to get a new buffer (in fileinit),
- * rest is peripheral state resetting.
- */
- init()
- {
- register int i;
-
- fileinit();
- dot = zero = truedol = unddol = dol = fendcore;
- one = zero+1;
- undkind = UNDNONE;
- chng = 0;
- edited = 0;
- for (i = 0; i <= 'z'-'a'+1; i++)
- names[i] = 1;
- anymarks = 0;
- #ifdef CRYPT
- if(xflag) {
- xtflag = 1;
- makekey(key, tperm);
- }
- #endif
- }
-
- /*
- * Return last component of unix path name p.
- */
- char *
- tailpath(p)
- register char *p;
- {
- register char *r;
-
- for (r=p; *p; p++)
- if (*p == '/')
- r = p+1;
- return(r);
- }
-
- /*
- * Check ownership of file. Return nonzero if it exists and is owned by the
- * user or the option sourceany is used
- */
- iownit(file)
- char *file;
- {
- struct stat sb;
-
- if (stat(file, &sb) == 0 && (value(SOURCEANY) || sb.st_uid == getuid()))
- return(1);
- else
- return(0);
- }
-