summaryrefslogtreecommitdiff
path: root/misc.c
blob: a7e9e711f4f131ab967fd50ea1324f1417f00989 (plain)
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
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
/* Miscellaneous generic support functions for GNU Make.
Copyright (C) 1988, 89, 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
This file is part of GNU Make.

GNU Make is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Make is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Make; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "make.h"
#include "dep.h"


/* Compare strings *S1 and *S2.
   Return negative if the first is less, positive if it is greater,
   zero if they are equal.  */

int
alpha_compare (s1, s2)
     char **s1, **s2;
{
  if (**s1 != **s2)
    return **s1 - **s2;
  return strcmp (*s1, *s2);
}

/* Discard each backslash-newline combination from LINE.
   Backslash-backslash-newline combinations become backslash-newlines.
   This is done by copying the text at LINE into itself.  */

void
collapse_continuations (line)
     char *line;
{
  register char *in, *out, *p;
  register int backslash;
  register unsigned int bs_write;

  in = index (line, '\n');
  if (in == 0)
    return;

  out = in;
  if (out > line)
    while (out[-1] == '\\')
      --out;

  while (*in != '\0')
    {
      /* BS_WRITE gets the number of quoted backslashes at
	 the end just before IN, and BACKSLASH gets nonzero
	 if the next character is quoted.  */
      backslash = 0;
      bs_write = 0;
      for (p = in - 1; p >= line && *p == '\\'; --p)
	{
	  if (backslash)
	    ++bs_write;
	  backslash = !backslash;

	  /* It should be impossible to go back this far without exiting,
	     but if we do, we can't get the right answer.  */
	  if (in == out - 1)
	    abort ();
	}

      /* Output the appropriate number of backslashes.  */
      while (bs_write-- > 0)
	*out++ = '\\';

      /* Skip the newline.  */
      ++in;

      /* If the newline is quoted, discard following whitespace
	 and any preceding whitespace; leave just one space.  */
      if (backslash)
	{
	  in = next_token (in);
	  while (out > line && isblank (out[-1]))
	    --out;
	  *out++ = ' ';
	}
      else
	/* If the newline isn't quoted, put it in the output.  */
	*out++ = '\n';

      /* Now copy the following line to the output.
	 Stop when we find backslashes followed by a newline.  */
      while (*in != '\0')
	if (*in == '\\')
	  {
	    p = in + 1;
	    while (*p == '\\')
	      ++p;
	    if (*p == '\n')
	      {
		in = p;
		break;
	      }
	    while (in < p)
	      *out++ = *in++;
	  }
	else
	  *out++ = *in++;
    }

  *out = '\0';
}


/* Remove comments from LINE.
   This is done by copying the text at LINE onto itself.  */

void
remove_comments (line)
     char *line;
{
  char *comment;

  comment = find_char_unquote (line, "#", 0);

  if (comment != 0)
    /* Cut off the line at the #.  */
    *comment = '\0';
}

/* Print N spaces (used by DEBUGPR for target-depth).  */

void
print_spaces (n)
     register unsigned int n;
{
  while (n-- > 0)
    putchar (' ');
}


/* Return a newly-allocated string whose contents
   concatenate those of s1, s2, s3.  */

char *
concat (s1, s2, s3)
     register char *s1, *s2, *s3;
{
  register unsigned int len1, len2, len3;
  register char *result;

  len1 = *s1 != '\0' ? strlen (s1) : 0;
  len2 = *s2 != '\0' ? strlen (s2) : 0;
  len3 = *s3 != '\0' ? strlen (s3) : 0;

  result = (char *) xmalloc (len1 + len2 + len3 + 1);

  if (*s1 != '\0')
    bcopy (s1, result, len1);
  if (*s2 != '\0')
    bcopy (s2, result + len1, len2);
  if (*s3 != '\0')
    bcopy (s3, result + len1 + len2, len3);
  *(result + len1 + len2 + len3) = '\0';

  return result;
}

/* Print a message on stdout.  */

void
message (prefix, s1, s2, s3, s4, s5, s6)
     int prefix;
     char *s1, *s2, *s3, *s4, *s5, *s6;
{
  log_working_directory (1);

  if (s1 != 0)
    {
      if (prefix)
	{
	  if (makelevel == 0)
	    printf ("%s: ", program);
	  else
	    printf ("%s[%u]: ", program, makelevel);
	}
      printf (s1, s2, s3, s4, s5, s6);
      putchar ('\n');
    }

  fflush (stdout);
}

/* Print an error message and exit.  */

/* VARARGS1 */
void
fatal (s1, s2, s3, s4, s5, s6)
     char *s1, *s2, *s3, *s4, *s5, *s6;
{
  log_working_directory (1);

  if (makelevel == 0)
    fprintf (stderr, "%s: *** ", program);
  else
    fprintf (stderr, "%s[%u]: *** ", program, makelevel);
  fprintf (stderr, s1, s2, s3, s4, s5, s6);
  fputs (".  Stop.\n", stderr);

  die (2);
}

/* Print error message.  `s1' is printf control string, `s2' is arg for it. */

/* VARARGS1 */

void
error (s1, s2, s3, s4, s5, s6)
     char *s1, *s2, *s3, *s4, *s5, *s6;
{
  log_working_directory (1);

  if (makelevel == 0)
    fprintf (stderr, "%s: ", program);
  else
    fprintf (stderr, "%s[%u]: ", program, makelevel);
  fprintf (stderr, s1, s2, s3, s4, s5, s6);
  putc ('\n', stderr);
  fflush (stderr);
}

void
makefile_error (file, lineno, s1, s2, s3, s4, s5, s6)
     char *file;
     unsigned int lineno;
     char *s1, *s2, *s3, *s4, *s5, *s6;
{
  log_working_directory (1);

  fprintf (stderr, "%s:%u: ", file, lineno);
  fprintf (stderr, s1, s2, s3, s4, s5, s6);
  putc ('\n', stderr);
  fflush (stderr);
}

void
makefile_fatal (file, lineno, s1, s2, s3, s4, s5, s6)
     char *file;
     unsigned int lineno;
     char *s1, *s2, *s3, *s4, *s5, *s6;
{
  log_working_directory (1);

  fprintf (stderr, "%s:%u: *** ", file, lineno);
  fprintf (stderr, s1, s2, s3, s4, s5, s6);
  fputs (".  Stop.\n", stderr);

  die (2);
}

#ifndef HAVE_STRERROR

#undef	strerror

char *
strerror (errnum)
     int errnum;
{
  extern int errno, sys_nerr;
  extern char *sys_errlist[];
  static char buf[] = "Unknown error 12345678901234567890";

  if (errno < sys_nerr)
    return sys_errlist[errnum];

  sprintf (buf, "Unknown error %d", errnum);
  return buf;
}
#endif

/* Print an error message from errno.  */

void
perror_with_name (str, name)
     char *str, *name;
{
  error ("%s%s: %s", str, name, strerror (errno));
}

/* Print an error message from errno and exit.  */

void
pfatal_with_name (name)
     char *name;
{
  fatal ("%s: %s", name, strerror (errno));

  /* NOTREACHED */
}

/* Like malloc but get fatal error if memory is exhausted.  */

#undef xmalloc
#undef xrealloc

char *
xmalloc (size)
     unsigned int size;
{
  char *result = (char *) malloc (size);
  if (result == 0)
    fatal ("virtual memory exhausted");
  return result;
}


char *
xrealloc (ptr, size)
     char *ptr;
     unsigned int size;
{
  char *result = (char *) realloc (ptr, size);
  if (result == 0)
    fatal ("virtual memory exhausted");
  return result;
}

char *
savestring (str, length)
     char *str;
     unsigned int length;
{
  register char *out = (char *) xmalloc (length + 1);
  if (length > 0)
    bcopy (str, out, length);
  out[length] = '\0';
  return out;
}

/* Search string BIG (length BLEN) for an occurrence of
   string SMALL (length SLEN).  Return a pointer to the
   beginning of the first occurrence, or return nil if none found.  */

char *
sindex (big, blen, small, slen)
     char *big;
     unsigned int blen;
     char *small;
     unsigned int slen;
{
  register unsigned int b;

  if (blen < 1)
    blen = strlen (big);
  if (slen < 1)
    slen = strlen (small);

  for (b = 0; b < blen; ++b)
    if (big[b] == *small && !strncmp (&big[b + 1], small + 1, slen - 1))
      return (&big[b]);

  return 0;
}

/* Limited INDEX:
   Search through the string STRING, which ends at LIMIT, for the character C.
   Returns a pointer to the first occurrence, or nil if none is found.
   Like INDEX except that the string searched ends where specified
   instead of at the first null.  */

char *
lindex (s, limit, c)
     register char *s, *limit;
     int c;
{
  while (s < limit)
    if (*s++ == c)
      return s - 1;

  return 0;
}

/* Return the address of the first whitespace or null in the string S.  */

char *
end_of_token (s)
     char *s;
{
  while (*s != '\0' && !isblank (*s))
    ++s;
  return s;
}

/* Return the address of the first nonwhitespace or null in the string S.  */

char *
next_token (s)
     char *s;
{
  register char *p = s;

  while (isblank (*p))
    ++p;
  return p;
}

/* Find the next token in PTR; return the address of it, and store the
   length of the token into *LENGTHPTR if LENGTHPTR is not nil.  */

char *
find_next_token (ptr, lengthptr)
     char **ptr;
     unsigned int *lengthptr;
{
  char *p = next_token (*ptr);
  char *end;

  if (*p == '\0')
    return 0;

  *ptr = end = end_of_token (p);
  if (lengthptr != 0)
    *lengthptr = end - p;
  return p;
}

/* Copy a chain of `struct dep', making a new chain
   with the same contents as the old one.  */

struct dep *
copy_dep_chain (d)
     register struct dep *d;
{
  register struct dep *c;
  struct dep *firstnew = 0;
  struct dep *lastnew;

  while (d != 0)
    {
      c = (struct dep *) xmalloc (sizeof (struct dep));
      bcopy ((char *) d, (char *) c, sizeof (struct dep));
      if (c->name != 0)
	c->name = savestring (c->name, strlen (c->name));
      c->next = 0;
      if (firstnew == 0)
	firstnew = lastnew = c;
      else
	lastnew = lastnew->next = c;

      d = d->next;
    }

  return firstnew;
}

#ifdef	iAPX286
/* The losing compiler on this machine can't handle this macro.  */

char *
dep_name (dep)
     struct dep *dep;
{
  return dep->name == 0 ? dep->file->name : dep->name;
}
#endif

#ifdef	GETLOADAVG_PRIVILEGED

#ifdef POSIX

/* Hopefully if a system says it's POSIX.1 and has the setuid and setgid
   functions, they work as POSIX.1 says.  Some systems (Alpha OSF/1 1.2,
   for example) which claim to be POSIX.1 also have the BSD setreuid and
   setregid functions, but they don't work as in BSD and only the POSIX.1
   way works.  */

#undef HAVE_SETREUID
#undef HAVE_SETREGID

#else	/* Not POSIX.  */

/* Some POSIX.1 systems have the seteuid and setegid functions.  In a
   POSIX-like system, they are the best thing to use.  However, some
   non-POSIX systems have them too but they do not work in the POSIX style
   and we must use setreuid and setregid instead.  */

#undef HAVE_SETEUID
#undef HAVE_SETEGID

#endif	/* POSIX.  */

#ifndef	HAVE_UNISTD_H
extern int getuid (), getgid (), geteuid (), getegid ();
extern int setuid (), setgid ();
#ifdef HAVE_SETEUID
extern int seteuid ();
#else
#ifdef	HAVE_SETREUID
extern int setreuid ();
#endif	/* Have setreuid.  */
#endif	/* Have seteuid.  */
#ifdef HAVE_SETEGID
extern int setegid ();
#else
#ifdef	HAVE_SETREGID
extern int setregid ();
#endif	/* Have setregid.  */
#endif	/* Have setegid.  */
#endif	/* No <unistd.h>.  */

/* Keep track of the user and group IDs for user- and make- access.  */
static int user_uid = -1, user_gid = -1, make_uid = -1, make_gid = -1;
#define	access_inited	(user_uid != -1)
static enum { make, user } current_access;


/* Under -d, write a message describing the current IDs.  */

static void
log_access (flavor)
     char *flavor;
{
  if (! debug_flag)
    return;

  /* All the other debugging messages go to stdout,
     but we write this one to stderr because it might be
     run in a child fork whose stdout is piped.  */

  fprintf (stderr, "%s access: user %d (real %d), group %d (real %d)\n",
	   flavor, geteuid (), getuid (), getegid (), getgid ());
  fflush (stderr);
}


static void
init_access ()
{
  user_uid = getuid ();
  user_gid = getgid ();

  make_uid = geteuid ();
  make_gid = getegid ();

  /* Do these ever fail?  */
  if (user_uid == -1 || user_gid == -1 || make_uid == -1 || make_gid == -1)
    pfatal_with_name ("get{e}[gu]id");

  log_access ("Initialized");

  current_access = make;
}

#endif	/* GETLOADAVG_PRIVILEGED */

/* Give the process appropriate permissions for access to
   user data (i.e., to stat files, or to spawn a child process).  */
void
user_access ()
{
#ifdef	GETLOADAVG_PRIVILEGED

  if (!access_inited)
    init_access ();

  if (current_access == user)
    return;

  /* We are in "make access" mode.  This means that the effective user and
     group IDs are those of make (if it was installed setuid or setgid).
     We now want to set the effective user and group IDs to the real IDs,
     which are the IDs of the process that exec'd make.  */

#ifdef	HAVE_SETEUID

  /* Modern systems have the seteuid/setegid calls which set only the
     effective IDs, which is ideal.  */

  if (seteuid (user_uid) < 0)
    pfatal_with_name ("user_access: seteuid");

#else	/* Not HAVE_SETEUID.  */

#ifndef	HAVE_SETREUID

  /* System V has only the setuid/setgid calls to set user/group IDs.
     There is an effective ID, which can be set by setuid/setgid.
     It can be set (unless you are root) only to either what it already is
     (returned by geteuid/getegid, now in make_uid/make_gid),
     the real ID (return by getuid/getgid, now in user_uid/user_gid),
     or the saved set ID (what the effective ID was before this set-ID
     executable (make) was exec'd).  */

  if (setuid (user_uid) < 0)
    pfatal_with_name ("user_access: setuid");

#else	/* HAVE_SETREUID.  */

  /* In 4BSD, the setreuid/setregid calls set both the real and effective IDs.
     They may be set to themselves or each other.  So you have two alternatives
     at any one time.  If you use setuid/setgid, the effective will be set to
     the real, leaving only one alternative.  Using setreuid/setregid, however,
     you can toggle between your two alternatives by swapping the values in a
     single setreuid or setregid call.  */

  if (setreuid (make_uid, user_uid) < 0)
    pfatal_with_name ("user_access: setreuid");

#endif	/* Not HAVE_SETREUID.  */
#endif	/* HAVE_SETEUID.  */

#ifdef	HAVE_SETEGID
  if (setegid (user_gid) < 0)
    pfatal_with_name ("user_access: setegid");
#else
#ifndef	HAVE_SETREGID
  if (setgid (user_gid) < 0)
    pfatal_with_name ("user_access: setgid");
#else
  if (setregid (make_gid, user_gid) < 0)
    pfatal_with_name ("user_access: setregid");
#endif
#endif

  current_access = user;

  log_access ("User");

#endif	/* GETLOADAVG_PRIVILEGED */
}

/* Give the process appropriate permissions for access to
   make data (i.e., the load average).  */
void
make_access ()
{
#ifdef	GETLOADAVG_PRIVILEGED

  if (!access_inited)
    init_access ();

  if (current_access == make)
    return;

  /* See comments in user_access, above.  */

#ifdef	HAVE_SETEUID
  if (seteuid (make_uid) < 0)
    pfatal_with_name ("make_access: seteuid");
#else
#ifndef	HAVE_SETREUID
  if (setuid (make_uid) < 0)
    pfatal_with_name ("make_access: setuid");
#else
  if (setreuid (user_uid, make_uid) < 0)
    pfatal_with_name ("make_access: setreuid");
#endif
#endif

#ifdef	HAVE_SETEGID
  if (setegid (make_gid) < 0)
    pfatal_with_name ("make_access: setegid");
#else
#ifndef	HAVE_SETREGID
  if (setgid (make_gid) < 0)
    pfatal_with_name ("make_access: setgid");
#else
  if (setregid (user_gid, make_gid) < 0)
    pfatal_with_name ("make_access: setregid");
#endif
#endif

  current_access = make;

  log_access ("Make");

#endif	/* GETLOADAVG_PRIVILEGED */
}

/* Give the process appropriate permissions for a child process.
   This is like user_access, but you can't get back to make_access.  */
void
child_access ()
{
#ifdef	GETLOADAVG_PRIVILEGED

  if (!access_inited)
    abort ();

  /* Set both the real and effective UID and GID to the user's.
     They cannot be changed back to make's.  */

#ifndef	HAVE_SETREUID
  if (setuid (user_uid) < 0)
    pfatal_with_name ("child_access: setuid");
#else
  if (setreuid (user_uid, user_uid) < 0)
    pfatal_with_name ("child_access: setreuid");
#endif

#ifndef	HAVE_SETREGID
  if (setgid (user_gid) < 0)
    pfatal_with_name ("child_access: setgid");
#else
  if (setregid (user_gid, user_gid) < 0)
    pfatal_with_name ("child_access: setregid");
#endif

  log_access ("Child");

#endif	/* GETLOADAVG_PRIVILEGED */
}

#ifdef NEED_GET_PATH_MAX
unsigned int
get_path_max ()
{
  static unsigned int value;

  if (value == 0)
    {
      long int x = pathconf ("/", _PC_PATH_MAX);
      if (x > 0)
	value = x;
      else
	return MAXPATHLEN;
    }

  return value;
}
#endif