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1.1 root 1: /* Copyright (c) 1981 Regents of the University of California */
2: static char *sccsid = "@(#)ex.c 7.1 7/8/81";
3: #include "ex.h"
4: #include "ex_argv.h"
5: #include "ex_temp.h"
6: #include "ex_tty.h"
7:
8: #ifdef TRACE
9: char tttrace[] = { '/','d','e','v','/','t','t','y','x','x',0 };
10: #endif
11:
12: /*
13: * The code for ex is divided as follows:
14: *
15: * ex.c Entry point and routines handling interrupt, hangup
16: * signals; initialization code.
17: *
18: * ex_addr.c Address parsing routines for command mode decoding.
19: * Routines to set and check address ranges on commands.
20: *
21: * ex_cmds.c Command mode command decoding.
22: *
23: * ex_cmds2.c Subroutines for command decoding and processing of
24: * file names in the argument list. Routines to print
25: * messages and reset state when errors occur.
26: *
27: * ex_cmdsub.c Subroutines which implement command mode functions
28: * such as append, delete, join.
29: *
30: * ex_data.c Initialization of options.
31: *
32: * ex_get.c Command mode input routines.
33: *
34: * ex_io.c General input/output processing: file i/o, unix
35: * escapes, filtering, source commands, preserving
36: * and recovering.
37: *
38: * ex_put.c Terminal driving and optimizing routines for low-level
39: * output (cursor-positioning); output line formatting
40: * routines.
41: *
42: * ex_re.c Global commands, substitute, regular expression
43: * compilation and execution.
44: *
45: * ex_set.c The set command.
46: *
47: * ex_subr.c Loads of miscellaneous subroutines.
48: *
49: * ex_temp.c Editor buffer routines for main buffer and also
50: * for named buffers (Q registers if you will.)
51: *
52: * ex_tty.c Terminal dependent initializations from termcap
53: * data base, grabbing of tty modes (at beginning
54: * and after escapes).
55: *
56: * ex_unix.c Routines for the ! command and its variations.
57: *
58: * ex_v*.c Visual/open mode routines... see ex_v.c for a
59: * guide to the overall organization.
60: */
61:
62: /*
63: * Main procedure. Process arguments and then
64: * transfer control to the main command processing loop
65: * in the routine commands. We are entered as either "ex", "edit", "vi"
66: * or "view" and the distinction is made here. Actually, we are "vi" if
67: * there is a 'v' in our name, "view" is there is a 'w', and "edit" if
68: * there is a 'd' in our name. For edit we just diddle options;
69: * for vi we actually force an early visual command.
70: */
71: main(ac, av)
72: register int ac;
73: register char *av[];
74: {
75: #ifndef VMUNIX
76: char *erpath = EXSTRINGS;
77: #endif
78: register char *cp;
79: register int c;
80: bool recov = 0;
81: bool ivis;
82: bool itag = 0;
83: bool fast = 0;
84: extern int onemt();
85: #ifdef TRACE
86: register char *tracef;
87: #endif
88:
89: /*
90: * Immediately grab the tty modes so that we wont
91: * get messed up if an interrupt comes in quickly.
92: */
93: gTTY(1);
94: #ifndef USG3TTY
95: normf = tty.sg_flags;
96: #else
97: normf = tty;
98: #endif
99: ppid = getpid();
100: /*
101: * Defend against d's, v's, w's, and a's in directories of
102: * path leading to our true name.
103: */
104: av[0] = tailpath(av[0]);
105:
106: /*
107: * Figure out how we were invoked: ex, edit, vi, view.
108: */
109: ivis = any('v', av[0]); /* "vi" */
110: if (any('w', av[0])) /* "view" */
111: value(READONLY) = 1;
112: if (any('d', av[0])) { /* "edit" */
113: value(OPEN) = 0;
114: value(REPORT) = 1;
115: value(MAGIC) = 0;
116: }
117:
118: #ifndef VMUNIX
119: /*
120: * For debugging take files out of . if name is a.out.
121: */
122: if (av[0][0] == 'a')
123: erpath = tailpath(erpath);
124: #endif
125: /*
126: * Open the error message file.
127: */
128: draino();
129: #ifndef VMUNIX
130: erfile = open(erpath+4, 0);
131: if (erfile < 0) {
132: erfile = open(erpath, 0);
133: }
134: #endif
135: pstop();
136:
137: /*
138: * Initialize interrupt handling.
139: */
140: oldhup = signal(SIGHUP, SIG_IGN);
141: if (oldhup == SIG_DFL)
142: signal(SIGHUP, onhup);
143: oldquit = signal(SIGQUIT, SIG_IGN);
144: ruptible = signal(SIGINT, SIG_IGN) == SIG_DFL;
145: if (signal(SIGTERM, SIG_IGN) == SIG_DFL)
146: signal(SIGTERM, onhup);
147: if (signal(SIGEMT, SIG_IGN) == SIG_DFL)
148: signal(SIGEMT, onemt);
149:
150: /*
151: * Initialize end of core pointers.
152: * Normally we avoid breaking back to fendcore after each
153: * file since this can be expensive (much core-core copying).
154: * If your system can scatter load processes you could do
155: * this as ed does, saving a little core, but it will probably
156: * not often make much difference.
157: */
158: fendcore = (line *) sbrk(0);
159: endcore = fendcore - 2;
160:
161: /*
162: * Process flag arguments.
163: */
164: ac--, av++;
165: while (ac && av[0][0] == '-') {
166: c = av[0][1];
167: if (c == 0) {
168: hush = 1;
169: value(AUTOPRINT) = 0;
170: fast++;
171: } else switch (c) {
172:
173: case 'R':
174: value(READONLY) = 1;
175: break;
176:
177: #ifdef TRACE
178: case 'T':
179: if (av[0][2] == 0)
180: tracef = "trace";
181: else {
182: tracef = tttrace;
183: tracef[8] = av[0][2];
184: if (tracef[8])
185: tracef[9] = av[0][3];
186: else
187: tracef[9] = 0;
188: }
189: trace = fopen(tracef, "w");
190: #define tracbuf NULL
191: if (trace == NULL)
192: printf("Trace create error\n");
193: else
194: setbuf(trace, tracbuf);
195: break;
196:
197: #endif
198:
199: #ifdef LISPCODE
200: case 'l':
201: value(LISP) = 1;
202: value(SHOWMATCH) = 1;
203: break;
204: #endif
205:
206: case 'r':
207: recov++;
208: break;
209:
210: case 't':
211: if (ac > 1 && av[1][0] != '-') {
212: ac--, av++;
213: itag = 1;
214: /* BUG: should check for too long tag. */
215: CP(lasttag, av[0]);
216: }
217: break;
218:
219: case 'v':
220: ivis = 1;
221: break;
222:
223: case 'w':
224: defwind = 0;
225: if (av[0][2] == 0) defwind = 3;
226: else for (cp = &av[0][2]; isdigit(*cp); cp++)
227: defwind = 10*defwind + *cp - '0';
228: break;
229:
230: #ifdef CRYPT
231: case 'x':
232: /* -x: encrypted mode */
233: xflag = 1;
234: break;
235: #endif
236:
237: default:
238: smerror("Unknown option %s\n", av[0]);
239: break;
240: }
241: ac--, av++;
242: }
243:
244: #ifdef SIGTSTP
245: if (!hush && signal(SIGTSTP, SIG_IGN) == SIG_DFL)
246: signal(SIGTSTP, onsusp), dosusp++;
247: #endif
248:
249: if (ac && av[0][0] == '+') {
250: firstpat = &av[0][1];
251: ac--, av++;
252: }
253:
254: #ifdef CRYPT
255: if(xflag){
256: key = getpass(KEYPROMPT);
257: kflag = crinit(key, perm);
258: }
259: #endif
260:
261: /*
262: * If we are doing a recover and no filename
263: * was given, then execute an exrecover command with
264: * the -r option to type out the list of saved file names.
265: * Otherwise set the remembered file name to the first argument
266: * file name so the "recover" initial command will find it.
267: */
268: if (recov) {
269: if (ac == 0) {
270: ppid = 0;
271: setrupt();
272: execl(EXRECOVER, "exrecover", "-r", 0);
273: filioerr(EXRECOVER);
274: exit(1);
275: }
276: CP(savedfile, *av++), ac--;
277: }
278:
279: /*
280: * Initialize the argument list.
281: */
282: argv0 = av;
283: argc0 = ac;
284: args0 = av[0];
285: erewind();
286:
287: /*
288: * Initialize a temporary file (buffer) and
289: * set up terminal environment. Read user startup commands.
290: */
291: if (setexit() == 0) {
292: setrupt();
293: intty = isatty(0);
294: value(PROMPT) = intty;
295: if (cp = getenv("SHELL"))
296: CP(shell, cp);
297: if (fast || !intty)
298: setterm("dumb");
299: else {
300: gettmode();
301: if ((cp = getenv("TERM")) != 0 && *cp)
302: setterm(cp);
303: }
304: }
305: if (setexit() == 0 && !fast && intty) {
306: if ((globp = getenv("EXINIT")) && *globp)
307: commands(1,1);
308: else {
309: globp = 0;
310: if ((cp = getenv("HOME")) != 0 && *cp)
311: source(strcat(strcpy(genbuf, cp), "/.exrc"), 1);
312: }
313: /*
314: * Allow local .exrc too. This loses if . is $HOME,
315: * but nobody should notice unless they do stupid things
316: * like putting a version command in .exrc. Besides,
317: * they should be using EXINIT, not .exrc, right?
318: */
319: source(".exrc", 1);
320: }
321: init(); /* moved after prev 2 chunks to fix directory option */
322:
323: /*
324: * Initial processing. Handle tag, recover, and file argument
325: * implied next commands. If going in as 'vi', then don't do
326: * anything, just set initev so we will do it later (from within
327: * visual).
328: */
329: if (setexit() == 0) {
330: if (recov)
331: globp = "recover";
332: else if (itag)
333: globp = ivis ? "tag" : "tag|p";
334: else if (argc)
335: globp = "next";
336: if (ivis)
337: initev = globp;
338: else if (globp) {
339: inglobal = 1;
340: commands(1, 1);
341: inglobal = 0;
342: }
343: }
344:
345: /*
346: * Vi command... go into visual.
347: * Strange... everything in vi usually happens
348: * before we ever "start".
349: */
350: if (ivis) {
351: /*
352: * Don't have to be upward compatible with stupidity
353: * of starting editing at line $.
354: */
355: if (dol > zero)
356: dot = one;
357: globp = "visual";
358: if (setexit() == 0)
359: commands(1, 1);
360: }
361:
362: /*
363: * Clear out trash in state accumulated by startup,
364: * and then do the main command loop for a normal edit.
365: * If you quit out of a 'vi' command by doing Q or ^\,
366: * you also fall through to here.
367: */
368: seenprompt = 1;
369: ungetchar(0);
370: globp = 0;
371: initev = 0;
372: setlastchar('\n');
373: setexit();
374: commands(0, 0);
375: cleanup(1);
376: exit(0);
377: }
378:
379: /*
380: * Initialization, before editing a new file.
381: * Main thing here is to get a new buffer (in fileinit),
382: * rest is peripheral state resetting.
383: */
384: init()
385: {
386: register int i;
387:
388: fileinit();
389: dot = zero = truedol = unddol = dol = fendcore;
390: one = zero+1;
391: undkind = UNDNONE;
392: chng = 0;
393: edited = 0;
394: for (i = 0; i <= 'z'-'a'+1; i++)
395: names[i] = 1;
396: anymarks = 0;
397: #ifdef CRYPT
398: if(xflag) {
399: xtflag = 1;
400: makekey(key, tperm);
401: }
402: #endif
403: }
404:
405: /*
406: * Return last component of unix path name p.
407: */
408: char *
409: tailpath(p)
410: register char *p;
411: {
412: register char *r;
413:
414: for (r=p; *p; p++)
415: if (*p == '/')
416: r = p+1;
417: return(r);
418: }
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