2BSD/src/ex/ex.c
/* Copyright (c) 1979 Regents of the University of California */
#include "ex.h"
#include "ex_argv.h"
#include "ex_temp.h"
#include "ex_tty.h"
#ifdef TRACE
char tttrace[] = { '/','d','e','v','/','t','t','y','x','x',0 };
#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_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" or "vi"
* and the distinction is made here. Actually, we are "vi" if
* there is a 'v' in our name, 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, setting the external initev so
* the q command in visual doesn't give command mode.
*/
main(ac, av)
register int ac;
register char *av[];
{
char *erpath = EXSTRINGS;
register char *cp;
register int c;
bool recov = 0;
bool ivis = any('v', av[0]);
bool itag = 0;
bool fast = 0;
#ifdef TRACE
register char *tracef;
#endif
/*
* Immediately grab the tty modes so that we wont
* get messed up if an interrupt comes in quickly.
*/
gTTY(1);
normf = tty.sg_flags;
/*
* For debugging take files out of . if name is a.out.
* If a 'd' in our name, then set options for edit.
*/
if (av[0][0] == 'a')
erpath += 9;
if (ivis) {
options[MAGIC].odefault = value(MAGIC) = 0;
options[BEAUTIFY].odefault = value(BEAUTIFY) = 1;
} else if (any('d', av[0])) {
value(OPEN) = 0;
value(REPORT) = 1;
value(MAGIC) = 0;
}
/*
* Open the error message file.
*/
draino();
erfile = open(erpath, 0);
if (erfile < 0) {
flush();
exit(1);
}
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);
/*
* 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;
/*
* 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) {
#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");
if (trace == NULL)
printf("Trace create error\n");
setbuf(trace, tracbuf);
break;
#endif
#ifdef LISP
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':
globp = "";
ivis = 1;
break;
default:
smerror("Unknown option %s\n", av[0]);
break;
}
ac--, av++;
}
if (ac && av[0][0] == '+') {
firstln = getn(av[0] + 1);
if (firstln == 0)
firstln = 20000;
ac--, av++;
}
/*
* 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) {
die++;
setrupt();
execl(EXRECOVER, "exrecover", "-r", 0);
filioerr(EXRECOVER);
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.
*/
init();
if (setexit() == 0) {
setrupt();
intty = isatty(0);
if (fast || !intty)
setterm("dumb");
else {
gettmode();
if ((cp = getenv("TERM")) != 0)
setterm(cp);
if ((cp = getenv("HOME")) != 0)
source(strcat(strcpy(genbuf, cp), "/.exrc"), 1);
}
}
/*
* 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.
*/
ungetchar(0);
globp = 0;
initev = 0;
setlastchar('\n');
setexit();
commands(0, 0);
cleanup(1);
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;
}
/*
* When a hangup occurs our actions are similar to a preserve
* command. If the buffer has not been [Modified], then we do
* nothing but remove the temporary files and exit.
* Otherwise, we sync the temp file and then attempt a preserve.
* If the preserve succeeds, we unlink our temp files.
* If the preserve fails, we leave the temp files as they are
* as they are a backup even without preservation if they
* are not removed.
*/
onhup()
{
if (chng == 0) {
cleanup(1);
exit(0);
}
if (setexit() == 0) {
if (preserve()) {
cleanup(1);
exit(0);
}
}
exit(1);
}
/*
* An interrupt occurred. Drain any output which
* is still in the output buffering pipeline.
* Catch interrupts again. Unless we are in visual
* reset the output state (out of -nl mode, e.g).
* Then like a normal error (with the \n before Interrupt
* suppressed in visual mode).
*/
onintr()
{
#ifdef V6
signal(SIGINT, onintr);
#else
signal(SIGINT, inopen ? vintr : onintr);
#endif
draino();
if (!inopen) {
pstop();
setlastchar('\n');
#ifndef V6
}
#else
} else
vraw();
#endif
error("\nInterrupt" + inopen);
}
/*
* If we are interruptible, enable interrupts again.
* In some critical sections we turn interrupts off,
* but not very often.
*/
setrupt()
{
if (ruptible)
#ifdef V6
signal(SIGINT, onintr);
#else
signal(SIGINT, inopen ? vintr : onintr);
#endif
}
preserve()
{
synctmp();
pid = fork();
if (pid < 0)
return (0);
if (pid == 0) {
close(0);
dup(tfile);
execl(EXPRESERVE, "expreserve", (char *) 0);
exit(1);
}
waitfor();
if (rpid == pid && status == 0)
return (1);
return (0);
}
#ifndef V6
exit(i)
int i;
{
_exit(i);
}
#endif