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1.1 root 1: /*
2: * Copyright (c) 1980 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: #ifndef lint
8: char *copyright =
9: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
10: All rights reserved.\n";
11: #endif not lint
12:
13: #ifndef lint
14: static char *sccsid = "@(#)ex.c 7.7.1.1 (Berkeley) 10/21/90";
15: #endif not lint
16:
17: #include "ex.h"
18: #include "ex_argv.h"
19: #include "ex_temp.h"
20: #include "ex_tty.h"
21: #include "pathnames.h"
22:
23: #ifdef TRACE
24: #ifdef vms
25: char tttrace[] = { 't','r','a','c','e','.','l','i','s' };
26: #else
27: char tttrace[] = { '/','d','e','v','/','t','t','y','x','x',0 };
28: #endif
29: #endif
30:
31: /*
32: * The code for ex is divided as follows:
33: *
34: * ex.c Entry point and routines handling interrupt, hangup
35: * signals; initialization code.
36: *
37: * ex_addr.c Address parsing routines for command mode decoding.
38: * Routines to set and check address ranges on commands.
39: *
40: * ex_cmds.c Command mode command decoding.
41: *
42: * ex_cmds2.c Subroutines for command decoding and processing of
43: * file names in the argument list. Routines to print
44: * messages and reset state when errors occur.
45: *
46: * ex_cmdsub.c Subroutines which implement command mode functions
47: * such as append, delete, join.
48: *
49: * ex_data.c Initialization of options.
50: *
51: * ex_get.c Command mode input routines.
52: *
53: * ex_io.c General input/output processing: file i/o, unix
54: * escapes, filtering, source commands, preserving
55: * and recovering.
56: *
57: * ex_put.c Terminal driving and optimizing routines for low-level
58: * output (cursor-positioning); output line formatting
59: * routines.
60: *
61: * ex_re.c Global commands, substitute, regular expression
62: * compilation and execution.
63: *
64: * ex_set.c The set command.
65: *
66: * ex_subr.c Loads of miscellaneous subroutines.
67: *
68: * ex_temp.c Editor buffer routines for main buffer and also
69: * for named buffers (Q registers if you will.)
70: *
71: * ex_tty.c Terminal dependent initializations from termcap
72: * data base, grabbing of tty modes (at beginning
73: * and after escapes).
74: *
75: * ex_unix.c Routines for the ! command and its variations.
76: *
77: * ex_v*.c Visual/open mode routines... see ex_v.c for a
78: * guide to the overall organization.
79: */
80:
81: /*
82: * Main procedure. Process arguments and then
83: * transfer control to the main command processing loop
84: * in the routine commands. We are entered as either "ex", "edit", "vi"
85: * or "view" and the distinction is made here. Actually, we are "vi" if
86: * there is a 'v' in our name, "view" is there is a 'w', and "edit" if
87: * there is a 'd' in our name. For edit we just diddle options;
88: * for vi we actually force an early visual command.
89: */
90: main(ac, av)
91: register int ac;
92: register char *av[];
93: {
94: #ifdef EXSTRINGS
95: char *erpath = EXSTRINGS;
96: #endif
97: register char *cp;
98: register int c;
99: bool recov = 0;
100: bool ivis;
101: bool itag = 0;
102: bool fast = 0;
103: extern int onemt();
104: #ifdef UNIX_SBRK
105: extern char *sbrk();
106: #else
107: extern char *malloc();
108: #endif
109: #ifdef TRACE
110: register char *tracef;
111: #endif
112: #ifdef vms
113: char termtype[20];
114: #endif
115:
116: /*
117: * Immediately grab the tty modes so that we wont
118: * get messed up if an interrupt comes in quickly.
119: */
120: ex_gTTY(1);
121: #ifndef USG3TTY
122: normf = tty.sg_flags;
123: #else
124: normf = tty;
125: #endif
126: ppid = getpid();
127: /*
128: * Defend against d's, v's, w's, and a's in directories of
129: * path leading to our true name.
130: */
131: #ifndef vms
132: av[0] = tailpath(av[0]);
133: #else
134: /*
135: * This program has to be invoked by using the following
136: * string definitions:
137: *
138: * vi == "$dir:ex.exe vi"
139: * view == "$dir:ex.exe view"
140: * ex == "$dir:ex.exe ex"
141: * edit == "$dir:ex.exe edit"
142: */
143: ac--;
144: av++;
145: #endif
146:
147: /*
148: * Figure out how we were invoked: ex, edit, vi, view.
149: */
150: ivis = any('v', av[0]); /* "vi" */
151: if (any('w', av[0])) /* "view" */
152: value(READONLY) = 1;
153: if (any('d', av[0])) { /* "edit" */
154: value(OPEN) = 0;
155: value(REPORT) = 1;
156: value(MAGIC) = 0;
157: }
158:
159: #ifdef EXSTRINGS
160: /*
161: * For debugging take files out of . if name is a.out.
162: */
163: if (av[0][0] == 'a')
164: erpath = tailpath(erpath);
165: #endif
166: /*
167: * Open the error message file.
168: */
169: draino();
170: #ifdef EXSTRINGS
171: erfile = open(erpath+4, 0);
172: if (erfile < 0) {
173: erfile = open(erpath, 0);
174: }
175: #endif
176: pstop();
177:
178: /*
179: * Initialize interrupt handling.
180: */
181: oldhup = signal(SIGHUP, SIG_IGN);
182: if (oldhup == SIG_DFL)
183: signal(SIGHUP, onhup);
184: oldquit = signal(SIGQUIT, SIG_IGN);
185: ruptible = signal(SIGINT, SIG_IGN) == SIG_DFL;
186: if (signal(SIGTERM, SIG_IGN) == SIG_DFL)
187: signal(SIGTERM, onhup);
188: if (signal(SIGEMT, SIG_IGN) == SIG_DFL)
189: signal(SIGEMT, onemt);
190:
191: /*
192: * Process flag arguments.
193: */
194: ac--, av++;
195: while (ac && av[0][0] == '-') {
196: c = av[0][1];
197: if (c == 0) {
198: hush = 1;
199: value(AUTOPRINT) = 0;
200: fast++;
201: } else switch (c) {
202:
203: case 'R':
204: value(READONLY) = 1;
205: break;
206:
207: #ifdef TRACE
208: case 'T':
209: if (av[0][2] == 0)
210: tracef = "trace";
211: else {
212: tracef = tttrace;
213: tracef[8] = av[0][2];
214: if (tracef[8])
215: tracef[9] = av[0][3];
216: else
217: tracef[9] = 0;
218: }
219: trace = fopen(tracef, "w");
220: #define tracbuf NULL
221: if (trace == NULL)
222: ex_printf("Trace create error\n");
223: else
224: setbuf(trace, tracbuf);
225: break;
226:
227: #endif
228:
229: #ifdef LISPCODE
230: case 'l':
231: value(LISP) = 1;
232: value(SHOWMATCH) = 1;
233: break;
234: #endif
235:
236: case 'r':
237: recov++;
238: break;
239:
240: case 't':
241: if (ac > 1 && av[1][0] != '-') {
242: ac--, av++;
243: itag = 1;
244: /* BUG: should check for too long tag. */
245: CP(lasttag, av[0]);
246: }
247: break;
248:
249: case 'v':
250: ivis = 1;
251: break;
252:
253: case 'w':
254: defwind = 0;
255: if (av[0][2] == 0) defwind = 3;
256: else for (cp = &av[0][2]; isdigit(*cp); cp++)
257: defwind = 10*defwind + *cp - '0';
258: break;
259:
260:
261: default:
262: smerror("Unknown option %s\n", av[0]);
263: break;
264: }
265: ac--, av++;
266: }
267:
268: #ifdef SIGTSTP
269: if (!hush && signal(SIGTSTP, SIG_IGN) == SIG_DFL)
270: signal(SIGTSTP, onsusp), dosusp++;
271: #endif
272:
273: if (ac && av[0][0] == '+') {
274: firstpat = &av[0][1];
275: ac--, av++;
276: }
277:
278:
279: /*
280: * If we are doing a recover and no filename
281: * was given, then execute an exrecover command with
282: * the -r option to type out the list of saved file names.
283: * Otherwise set the remembered file name to the first argument
284: * file name so the "recover" initial command will find it.
285: */
286: if (recov) {
287: if (ac == 0) {
288: ppid = 0;
289: setrupt();
290: execl(_PATH_EXRECOVER, "exrecover", "-r", 0);
291: filioerr(_PATH_EXRECOVER);
292: ex_exit(1);
293: }
294: CP(savedfile, *av++), ac--;
295: }
296:
297: /*
298: * Initialize the argument list.
299: */
300: argv0 = av;
301: argc0 = ac;
302: args0 = av[0];
303: erewind();
304:
305: /*
306: * Initialize a temporary file (buffer) and
307: * set up terminal environment. Read user startup commands.
308: */
309: if (setexit() == 0) {
310: setrupt();
311: intty = isatty(0);
312: value(PROMPT) = intty;
313: #ifndef vms
314: if (cp = getenv("SHELL"))
315: #else
316: if (cp = getlog("SHELL"))
317: #endif
318: CP(shell, cp);
319: if (fast || !intty)
320: setterm("dumb");
321: else {
322: gettmode();
323: #ifndef vms
324: if ((cp = getenv("TERM")) != 0 && *cp)
325: setterm(cp);
326: #else
327: if ((cp = getlog("TERM")) != 0 && *cp) {
328: /*
329: * Can't just use it directly since getlog
330: * returns a pointer to a static buffer that
331: * tgetent() will eventually use
332: */
333: CP(termtype, cp);
334: setterm(termtype);
335: }
336: #endif
337: }
338: }
339: if (setexit() == 0 && !fast && intty) {
340: #ifndef vms
341: if ((globp = getenv("EXINIT")) && *globp)
342: #else
343: if ((globp = getlog("EXINIT")) && *globp)
344: #endif
345: commands(1,1);
346: else {
347: globp = 0;
348: if ((cp = getenv("HOME")) != 0 && *cp) {
349: (void) strcat(strcpy(genbuf, cp), "/.exrc");
350: if (iownit(genbuf))
351: source(genbuf, 1);
352: }
353: }
354: /*
355: * Allow local .exrc too. This loses if . is $HOME,
356: * but nobody should notice unless they do stupid things
357: * like putting a version command in .exrc. Besides,
358: * they should be using EXINIT, not .exrc, right?
359: */
360: if (iownit(".exrc"))
361: source(".exrc", 1);
362: }
363: #ifdef UNIX_SBRK
364: /*
365: * Initialize end of core pointers.
366: * Normally we avoid breaking back to fendcore after each
367: * file since this can be expensive (much core-core copying).
368: * If your system can scatter load processes you could do
369: * this as ed does, saving a little core, but it will probably
370: * not often make much difference.
371: */
372: fendcore = (line *) sbrk(0);
373: endcore = fendcore - 2;
374: #else
375: /*
376: * Allocate all the memory we will ever use in one chunk.
377: * This is for system such as VMS where sbrk() does not
378: * guarantee that the memory allocated beyond the end is
379: * consecutive. VMS's RMS does all sorts of memory allocation
380: * and screwed up ex royally because ex assumes that all
381: * memory up to "endcore" belongs to it and RMS has different
382: * ideas.
383: */
384: fendcore = (line *) malloc((unsigned)
385: value(LINELIMIT) * sizeof (line *));
386: if (fendcore == NULL) {
387: lprintf("ex: cannot handle %d lines\n", value(LINELIMIT));
388: lprintf("ex: set \"linelimit\" lower\n");
389: flush();
390: ex_exit(1);
391: }
392: endcore = fendcore + (value(LINELIMIT) - 1);
393: #endif
394: init(); /* moved after prev 2 chunks to fix directory option */
395:
396: /*
397: * Initial processing. Handle tag, recover, and file argument
398: * implied next commands. If going in as 'vi', then don't do
399: * anything, just set initev so we will do it later (from within
400: * visual).
401: */
402: if (setexit() == 0) {
403: if (recov)
404: globp = "recover";
405: else if (itag)
406: globp = ivis ? "tag" : "tag|p";
407: else if (argc)
408: globp = "next";
409: if (ivis)
410: initev = globp;
411: else if (globp) {
412: inglobal = 1;
413: commands(1, 1);
414: inglobal = 0;
415: }
416: }
417:
418: /*
419: * Vi command... go into visual.
420: * Strange... everything in vi usually happens
421: * before we ever "start".
422: */
423: if (ivis) {
424: /*
425: * Don't have to be upward compatible with stupidity
426: * of starting editing at line $.
427: */
428: if (dol > zero)
429: dot = one;
430: globp = "visual";
431: if (setexit() == 0)
432: commands(1, 1);
433: }
434:
435: /*
436: * Clear out trash in state accumulated by startup,
437: * and then do the main command loop for a normal edit.
438: * If you quit out of a 'vi' command by doing Q or ^\,
439: * you also fall through to here.
440: */
441: seenprompt = 1;
442: ungetchar(0);
443: globp = 0;
444: initev = 0;
445: setlastchar('\n');
446: setexit();
447: commands(0, 0);
448: cleanup(1);
449: ex_exit(0);
450: }
451:
452: /*
453: * Initialization, before editing a new file.
454: * Main thing here is to get a new buffer (in fileinit),
455: * rest is peripheral state resetting.
456: */
457: init()
458: {
459: register int i;
460:
461: fileinit();
462: dot = zero = truedol = unddol = dol = fendcore;
463: one = zero+1;
464: undkind = UNDNONE;
465: chng = 0;
466: edited = 0;
467: for (i = 0; i <= 'z'-'a'+1; i++)
468: names[i] = 1;
469: anymarks = 0;
470: }
471:
472: /*
473: * Return last component of unix path name p.
474: */
475: char *
476: tailpath(p)
477: register char *p;
478: {
479: register char *r;
480:
481: for (r=p; *p; p++)
482: if (*p == '/')
483: r = p+1;
484: return(r);
485: }
486:
487: /*
488: * Check ownership of file. Return nonzero if it exists and is owned by the
489: * user or the option sourceany is used
490: */
491: iownit(file)
492: char *file;
493: {
494: struct stat sb;
495:
496: if (stat(file, &sb) == 0 && (value(SOURCEANY) || sb.st_uid == getuid()))
497: return(1);
498: else
499: return(0);
500: }
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