File: altedit.c

package info (click to toggle)
alpine 2.02%2Bdfsg-2
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 34,748 kB
  • sloc: ansic: 315,132; tcl: 19,797; sh: 11,220; makefile: 1,866; perl: 189; exp: 69; csh: 48; sed: 16
file content (711 lines) | stat: -rw-r--r-- 15,857 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: altedit.c 854 2007-12-07 17:44:43Z hubert@u.washington.edu $";
#endif

/*
 * ========================================================================
 * Copyright 2006-2007 University of Washington
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * ========================================================================
 */


#include <system.h>
#include <general.h>

#include "../../pith/osdep/pipe.h"
#include "../../pith/osdep/forkwait.h"
#include "../../pith/charconv/filesys.h"

#include "../estruct.h"
#include "../mode.h"
#include "../pico.h"
#include "../edef.h"
#include "../efunc.h"
#include "../keydefs.h"
#include "../utf8stub.h"
#include "tty.h"
#include "filesys.h"

#ifdef _WINDOWS
#include "mswin.h"
#endif

#include "altedit.h"
#ifndef _WINDOWS
#include "signals.h"

#ifdef	SIGCHLD
static jmp_buf pico_child_state;
static short   pico_child_jmp_ok, pico_child_done;
#endif /* SIGCHLD */

#endif /* !_WINDOWS */


/* internal prototypes */
#ifndef _WINDOWS
#ifdef	SIGCHLD
RETSIGTYPE child_handler(int);
#endif /* SIGCHLD */
#else /* _WINDOWS */
int		alt_editor_valid(char *, char *, size_t);
int		alt_editor_valid_fp(char *);
#endif /* _WINDOWS */


/*
 * alt_editor - fork off an alternate editor for mail message composition 
 *              if one is configured and passed from pine.  If not, only
 *              ask for the editor if advanced user flag is set, and 
 *              suggest environment's EDITOR value as default.
 */
int
alt_editor(int f, int n)
{
#ifndef _WINDOWS
    char   eb[NLINE];				/* buf holding edit command */
    char   *fn;					/* tmp holder for file name */
    char   result[128];				/* result string */
    char   prmpt[128];
    int	   i, done = 0, ret = 0, rv, trv;
    pid_t  child, pid;
    RETSIGTYPE (*ohup)(int);
    RETSIGTYPE (*oint)(int);
    RETSIGTYPE (*osize)(int);
    int status;
    EML eml;

    eml.s = f ? "speller" : "editor";

    if(gmode&MDSCUR){
	emlwrite("Alternate %s not available in restricted mode", &eml);
	return(-1);
    }

    strncpy(result, "Alternate %s complete.", sizeof(result));
    result[sizeof(result)-1] = '\0';

    if(f){
	if(alt_speller){
	  strncpy(eb, alt_speller, sizeof(eb));
	  eb[sizeof(eb)-1] = '\0';
	}
	else
	  return(-1);
    }
    else if(Pmaster == NULL){
	return(-1);
    }
    else{
	eb[0] = '\0';

	if(Pmaster->alt_ed){
	    char **lp, *wsp, *path, fname[MAXPATH+1];
	    int	   c;

	    for(lp = Pmaster->alt_ed; *lp && **lp; lp++){
		if((wsp = strpbrk(*lp, " \t")) != NULL){
		    c = *wsp;
		    *wsp = '\0';
		}

		if(strchr(*lp, '/')){
		    rv = fexist(*lp, "x", (off_t *)NULL);
		}
		else{
		    if(!(path = getenv("PATH")))
		      path = ":/bin:/usr/bin";

		    rv = ~FIOSUC;
		    while(rv != FIOSUC && *path && pathcat(fname, &path, *lp))
		      rv = fexist(fname, "x", (off_t *)NULL);
		}

		if(wsp)
		  *wsp = c;

		if(rv == FIOSUC){
		    strncpy(eb, *lp, sizeof(eb));
		    eb[sizeof(eb)-1] = '\0';
		    break;
		}
	    }
	}

	if(!eb[0]){
	    if(!(gmode&MDADVN)){
		unknown_command(0);
		return(-1);
	    }

	    if(getenv("EDITOR")){
	      strncpy(eb, (char *)getenv("EDITOR"), sizeof(eb));
	      eb[sizeof(eb)-1] = '\0';
	    }
	    else
	      *eb = '\0';

	    while(!done){
		pid = mlreplyd_utf8("Which alternate editor ? ", eb,
			       sizeof(eb), QDEFLT, NULL);
		switch(pid){
		  case ABORT:
		    curwp->w_flag |= WFMODE;
		    return(-1);
		  case HELPCH:
		    emlwrite("no alternate editor help yet", NULL);

/* take sleep and break out after there's help */
		    sleep(3);
		    break;
		  case (CTRL|'L'):
		    sgarbf = TRUE;
		    update();
		    break;
		  case TRUE:
		  case FALSE:			/* does editor exist ? */
		    if(*eb == '\0'){		/* leave silently? */
			mlerase();
			curwp->w_flag |= WFMODE;
			return(-1);
		    }

		    done++;
		    break;
		    default:
		    break;
		}
	    }
	}
    }

    if((fn=writetmp(1, NULL)) == NULL){		/* get temp file */
	emlwrite("Problem writing temp file for alt editor", NULL);
	return(-1);
    }

    strncat(eb, " ", sizeof(eb)-strlen(eb)-1);
    eb[sizeof(eb)-1] = '\0';
    strncat(eb, fn, sizeof(eb)-strlen(eb)-1);
    eb[sizeof(eb)-1] = '\0';


    for(i = 0; i <= ((Pmaster) ? term.t_nrow : term.t_nrow - 1); i++){
	movecursor(i, 0);
	if(!i){
	    fputs("Invoking alternate ", stdout);
	    fputs(f ? "speller..." : "editor...", stdout);
	}

	peeol();
    }

    (*term.t_flush)();
    if(Pmaster)
      (*Pmaster->tty_fix)(0);
    else
      vttidy();

#ifdef	SIGCHLD
    if(Pmaster){
	/*
	 * The idea here is to keep any mail connections our caller
	 * may have open while our child's out running around...
	 */
	pico_child_done = pico_child_jmp_ok = 0;
	(void) signal(SIGCHLD,  child_handler);
    }
#endif

    if((child = fork()) > 0){		/* wait for the child to finish */
	ohup = signal(SIGHUP, SIG_IGN);	/* ignore signals for now */
	oint = signal(SIGINT, SIG_IGN);
#if	defined(SIGWINCH) && defined(TIOCGWINSZ)
        osize = signal(SIGWINCH, SIG_IGN);
#endif

#ifdef	SIGCHLD
	if(Pmaster){
	    while(!pico_child_done){
		(*Pmaster->newmail)(0, 0);
		if(!pico_child_done){
		    if(setjmp(pico_child_state) == 0){
			pico_child_jmp_ok = 1;
			sleep(600);
		    }
		    else
		      our_sigunblock(SIGCHLD);
		}

		pico_child_jmp_ok = 0;
	    }
	}
#endif

	trv = process_reap(child, &status, PR_NONE);

	signal(SIGHUP, ohup);	/* restore signals */
	signal(SIGINT, oint);
#if	defined(SIGWINCH) && defined(TIOCGWINSZ)
        signal(SIGWINCH, osize);
#endif

	/*
	 * Report child's unnatural or unhappy exit...
	 */
	if(trv > 0 && status == 0){
	  strncpy(result, "Alternate %s done", sizeof(result));
	  result[sizeof(result)-1] = '\0';
	}
	else {
	  snprintf(result, sizeof(result), "Alternate %%s terminated abnormally (%d)",
		  (trv == 0) ? status : -1);
	  if(f)
	    ret = -1;
	  else{
	      snprintf(prmpt, sizeof(prmpt), "Alt editor failed, use file %.20s of size %%ld chars anyway", fn);
	      ret = -2;
	  }
	}
    }
    else if(child == 0){		/* spawn editor */
	signal(SIGHUP, SIG_DFL);	/* let editor handle signals */
	signal(SIGINT, SIG_DFL);
#if	defined(SIGWINCH) && defined(TIOCGWINSZ)
        signal(SIGWINCH, SIG_DFL);
#endif
#ifdef	SIGCHLD
	(void) signal(SIGCHLD,  SIG_DFL);
#endif
	if(execl("/bin/sh", "sh", "-c", fname_to_locale(eb), (char *) NULL) < 0)
	  exit(-1);
    }
    else {				/* error! */
	snprintf(result, sizeof(result), "\007Can't fork %%s: %s", errstr(errno));
	ret = -1;
    }

#ifdef	SIGCHLD
    (void) signal(SIGCHLD,  SIG_DFL);
#endif

    if(Pmaster)
      (*Pmaster->tty_fix)(1);

    /*
     * replace edited text with new text 
     */
    curbp->b_flag &= ~BFCHG;		/* make sure old text gets blasted */

    if(ret == -2){
	off_t filesize;
	char  prompt[128];

	rv = fexist(fn, "r", &filesize);
	if(rv == FIOSUC && filesize > 0){
	    snprintf(prompt, sizeof(prompt), prmpt, (long) filesize);
	    /* clear bottom 3 rows */
	    pclear(term.t_nrow-2, term.t_nrow);
	    i = mlyesno_utf8(prompt, FALSE);
	    if(i == TRUE){
		ret = 0;
		strncpy(result, "OK, alternate %s done", sizeof(result));
		result[sizeof(result)-1] = '\0';
	    }
	    else
	      ret = -1;
	}
	else
	  ret = -1;
    }

    if(ret == 0)
      readin(fn, 0, 0);			/* read new text overwriting old */

    our_unlink(fn);			/* blast temp file */
    curbp->b_flag |= BFCHG;		/* mark dirty for packbuf() */
    ttopen();				/* reset the signals */
    pico_refresh(0, 1);			/* redraw */
    update();
    emlwrite(result, &eml);
    return(ret);
#else /* _WINDOWS */
    char   eb[2 * PATH_MAX];			/* buf holding edit command */
    char  *fn;					/* tmp holder for file name */
    char   errbuf[128];
    char **lp;
    int	   status;
    int	   done;
    int	   rc;


    if(Pmaster == NULL)
      return(-1);

    if(gmode&MDSCUR){
	emlwrite("Alternate editor not available in restricted mode", NULL);
	return(-1);
    }

    eb[0] = '\0';

    if(Pmaster->alt_ed){
	char *p;

	for(lp = Pmaster->alt_ed; *lp && **lp; lp++)
	  if(*lp[0] == '\"'){
	      if(p = strchr(*lp + 1, '\"')){
		  *p = '\0';
		  rc = alt_editor_valid((*lp) + 1, eb, sizeof(eb));
		  *p = '\"';
		  if(rc){
		      strncat(eb, p + 1, sizeof(eb)-strlen(eb)-1);
		      eb[sizeof(eb)-1] = '\0';
		      break;
		  }
	      }
	  }
	  else if(p = strchr(*lp, ' ')){
	      for(rc = 0; !rc; ){
		  if(p)
		    *p = '\0';

		  rc = alt_editor_valid(*lp, eb, sizeof(eb));

		  if(p)
		    *p = ' ';

		  if(rc){
		      if(p){
			  strncat(eb, p, sizeof(eb)-strlen(eb)-1);
			  eb[sizeof(eb)-1] = '\0';
		      }

		      break;
		  }
		  else if(p)
		    p = strchr(p + 1, ' ');
		  else
		    break;
	      }

	      if(rc)
		break;
	  }
	  else if(alt_editor_valid(*lp, eb, sizeof(eb)))
	    break;
    }

    if(!eb[0]){
	if(!(gmode&MDADVN)){
	    unknown_command(0);
	    return(-1);
	}
	
	/* Guess which editor they want. */
	if(getenv("EDITOR")){
	  strncpy(eb, (char *)getenv("EDITOR"), sizeof(eb));
	  eb[sizeof(eb)-1] = '\0';
	}
	else
	  *eb = '\0';
  
	done = FALSE;
	while(!done){
	    rc = mlreplyd_utf8("Which alternate editor ? ", eb,
			       sizeof(eb),QDEFLT,NULL);

	    switch(rc){
	      case ABORT:
		curwp->w_flag |= WFMODE;
		return(-1);
	      case HELPCH:
		emlwrite("no alternate editor help yet", NULL);

/* take sleep and break out after there's help */
		sleep(3);
		break;
	      case (CTRL|'L'):
		sgarbf = TRUE;
		update();
		break;
	      case TRUE:
	      case FALSE:			/* does editor exist ? */
		if(*eb == '\0'){		/* leave silently? */
		    mlerase();
		    curwp->w_flag |= WFMODE;
		    return(-1);
		}

		done++;
		break;
	      default:
		break;
	    }
	}
    }

    if((fn=writetmp(1, NULL)) == NULL){		/* get temp file */
	emlwrite("Problem writing temp file for alt editor", NULL);
	return(-1);
    }

    emlwrite("Waiting for alternate editor to finish...", NULL);

#ifdef ALTED_DOT
    if(eb[0] == '.' && eb[1] == '\0') {
        status = mswin_exec_and_wait ("alternate editor", eb, fn, fn,
    				  NULL, 0);
    }
    else
#endif /* ALTED_DOT */
    {				/* just here in case ALTED_DOT is defined */
    strncat(eb, " ", sizeof(eb)-strlen(eb)-1);
    eb[sizeof(eb)-1] = '\0';
    strncat(eb, fn, sizeof(eb)-strlen(eb)-1);
    eb[sizeof(eb)-1] = '\0';
    
    status = mswin_exec_and_wait ("alternate editor", eb, NULL, NULL,
				  NULL, 0);
    }

    switch (status) {

    case 0:
	/*
	 * Success:  replace edited text with new text 
	 */
	curbp->b_flag &= ~BFCHG;	/* make sure old text gets blasted */
	readin(fn, 0, 0);	        /* read new text overwriting old */
	our_unlink(fn);			/* blast temp file */
	curbp->b_flag |= BFCHG;		/* mark dirty for packbuf() */
	ttopen();			/* reset the signals */
	pico_refresh(0, 1);		/* redraw */
	return(0);

	
	/*
	 * Possible errors.
	 */
    case -1:
	/* Failed to map return from WinExec to a HTASK. */
	emlwrite("Problem finding alternate editor task handle.", NULL);
	return (-1);
	
    case -2:
	/* User decided to abandon the alternate editor.*/
	emlwrite("Alternate editor abandoned.", NULL);
	return (-1);

    default:
	mswin_exec_err_msg ("alternate editor", status, errbuf, sizeof(errbuf));
	emlwrite (errbuf, NULL);
	return (-1);
    }
    return (-1);
#endif /*_WINDOWS */
}



#ifndef _WINDOWS
int
pathcat(char *buf, char **path, char *file)
{
    register int n = 0;

    while(**path && **path != ':'){
	if(n++ > MAXPATH)
	  return(FALSE);

	*buf++ = *(*path)++;
    }

    if(n){
	if(n++ > MAXPATH)
	  return(FALSE);

	*buf++ = '/';
    }

    while((*buf = *file++) != '\0'){
	if(n++ > MAXPATH)
	  return(FALSE);

	buf++;
    }

    if(**path == ':')
      (*path)++;

    return(TRUE);
}


#ifdef	SIGCHLD
/*
 * child_handler - handle child status change signal
 */
RETSIGTYPE
child_handler(int sig)
{
    pico_child_done = 1;
    if(pico_child_jmp_ok){
#ifdef	sco
	/*
	 * Villy Kruse <vek@twincom.nl> says:
	 * This probably only affects older unix systems with a "broken" sleep             
	 * function such as AT&T System V rel 3.2 and systems derived from
	 * that version. The problem is that the sleep function on these
	 * versions of unix will set up a signal handler for SIGALRM which
	 * will longjmp into the sleep function when the alarm goes off.
	 * This gives problems if another signal handler longjmps out of the
	 * sleep function, thus making the stack frame for the signal function
	 * invalid, and when the ALARM handler later longjmps back into the
	 * sleep function it does no longer have a valid stack frame.
	 * My sugested fix is to cancel the pending alarm in the SIGCHLD
	 * handler before longjmp'ing. This shouldn't hurt as there
	 * shouldn't be any ALARM pending at this point except possibly from
	 * the sleep call.
	 *
	 *
	 * [Even though it shouldn't hurt, we'll make it sco-specific for now.]
	 *
	 *
	 * The sleep call might have set up a signal handler which would
	 * longjmp back into the sleep code, and that would cause a crash.
	 */
	signal(SIGALRM, SIG_IGN);	/* Cancel signal handeler */
	alarm(0);			/* might longjmp back into sleep */ 
#endif
	longjmp(pico_child_state, 1);
    }
}
#endif	/* SIGCHLD */

#else /* _WINDOWS */
/*
 * alt_editor_valid -- test the given exe name exists, and if so
 *		       return full name in "cmdbuf".
 */
int
alt_editor_valid(char *exe, char *cmdbuf, size_t ncmdbuf)
{

/****
 **** This isn't the right way to do this. I believe we
 **** should be doing all of this in TCHARs starting in
 **** the alt_editor function instead of trying to convert
 **** to char * here.
 ****/

    if(!exe)
      return(FALSE);

#ifdef ALTED_DOT
    if(exe[0] == '.' && exe[1] == '\0') {
        cmdbuf[0] = '.';
        cmdbuf[1] = '\0';
        return(TRUE);
    }
    else
#endif /* ALTED_DOT */

    if((isalpha((unsigned char) *exe) && *exe == ':') || strchr(exe, '\\')){
	char *path;

	if(alt_editor_valid_fp(path = exe)){
	    if(strchr(path, ' '))
	      snprintf(cmdbuf, ncmdbuf, "\"%s\"", path);
	    else{
		strncpy(cmdbuf, path, ncmdbuf);
		cmdbuf[ncmdbuf-1] = '\0';
	    }

	    return(TRUE);
	}
    }
    else{
	TCHAR  pathbuflpt[PATH_MAX+1];
	LPTSTR name, exelpt;
	LPTSTR cmdbuflpt;
	char  *utf8;

	cmdbuflpt = (LPTSTR) MemAlloc(ncmdbuf * sizeof(TCHAR));
	cmdbuflpt[0] = L'0';

	exelpt = utf8_to_lptstr(exe);

	if(SearchPath(NULL, exelpt, NULL, PATH_MAX+1, pathbuflpt, &name)){

	    if(_tcschr(pathbuflpt, L' '))
	      _stprintf_s(cmdbuflpt, ncmdbuf, TEXT("\"%s\""), pathbuflpt);
	    else
	      _stprintf_s(cmdbuflpt, ncmdbuf, TEXT("%s"), pathbuflpt);

	    if(exelpt)
	      fs_give((void **) &exelpt);

	    utf8 = lptstr_to_utf8(cmdbuflpt);
	    if(utf8){
		strncpy(cmdbuf, utf8, ncmdbuf);
		cmdbuf[ncmdbuf-1] = '\0';
		fs_give((void **) &utf8);
	    }

	    if(cmdbuflpt)
	      MemFree((void *) cmdbuflpt);

	    return(TRUE);
	}

	if(exelpt)
	  fs_give((void **) &exelpt);

	if(cmdbuflpt)
	  MemFree((void *) cmdbuflpt);
    }

    return(FALSE);
}


/*
 * alt_editor_valid_fp -- test the given full path name exists
 */
int
alt_editor_valid_fp(path)
    char *path;
{
    static char *exts[] = {".exe", ".com", ".bat", NULL};
    char	 pathcopy[PATH_MAX + 1], *dot = NULL;
    int		 i, j;

    for(i = 0; pathcopy[i] = path[i]; i++)
      if(path[i] == '.')
	dot = &path[i];

    if(dot && (!strucmp(dot, ".exe")
       || !strucmp(dot, ".com") || !strucmp(dot, ".bat"))){
	if(fexist(path, "x", (off_t *) NULL) == FIOSUC)
	  return(TRUE);
    }
    else{
	for(j = 0; exts[j]; j++){
	    strncpy(&pathcopy[i], exts[j], sizeof(pathcopy)-i);
	    pathcopy[sizeof(pathcopy)-1] = '\0';
	    if(fexist(pathcopy, "x", (off_t *) NULL) == FIOSUC)
	      return(TRUE);
	}
    }

    return(FALSE);
}
#endif