1 /* Miscellaneous generic support functions for GNU Make.
2 Copyright (C) 1988, 89, 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
3 This file is part of GNU Make.
5 GNU Make is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 GNU Make is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNU Make; see the file COPYING. If not, write to
17 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
23 /* Compare strings *S1 and *S2.
24 Return negative if the first is less, positive if it is greater,
25 zero if they are equal. */
28 alpha_compare (s1
, s2
)
33 return strcmp (*s1
, *s2
);
36 /* Discard each backslash-newline combination from LINE.
37 Backslash-backslash-newline combinations become backslash-newlines.
38 This is done by copying the text at LINE into itself. */
41 collapse_continuations (line
)
44 register char *in
, *out
, *p
;
45 register int backslash
;
46 register unsigned int bs_write
;
48 in
= index (line
, '\n');
53 while (out
> line
&& out
[-1] == '\\')
58 /* BS_WRITE gets the number of quoted backslashes at
59 the end just before IN, and BACKSLASH gets nonzero
60 if the next character is quoted. */
63 for (p
= in
- 1; p
>= line
&& *p
== '\\'; --p
)
67 backslash
= !backslash
;
69 /* It should be impossible to go back this far without exiting,
70 but if we do, we can't get the right answer. */
75 /* Output the appropriate number of backslashes. */
76 while (bs_write
-- > 0)
79 /* Skip the newline. */
82 /* If the newline is quoted, discard following whitespace
83 and any preceding whitespace; leave just one space. */
87 while (out
> line
&& isblank (out
[-1]))
92 /* If the newline isn't quoted, put it in the output. */
95 /* Now copy the following line to the output.
96 Stop when we find backslashes followed by a newline. */
119 /* Remove comments from LINE.
120 This is done by copying the text at LINE onto itself. */
123 remove_comments (line
)
128 comment
= find_char_unquote (line
, "#", 0);
131 /* Cut off the line at the #. */
135 /* Print N spaces (used by DEBUGPR for target-depth). */
139 register unsigned int n
;
146 /* Return a newly-allocated string whose contents
147 concatenate those of s1, s2, s3. */
151 register char *s1
, *s2
, *s3
;
153 register unsigned int len1
, len2
, len3
;
154 register char *result
;
156 len1
= *s1
!= '\0' ? strlen (s1
) : 0;
157 len2
= *s2
!= '\0' ? strlen (s2
) : 0;
158 len3
= *s3
!= '\0' ? strlen (s3
) : 0;
160 result
= (char *) xmalloc (len1
+ len2
+ len3
+ 1);
163 bcopy (s1
, result
, len1
);
165 bcopy (s2
, result
+ len1
, len2
);
167 bcopy (s3
, result
+ len1
+ len2
, len3
);
168 *(result
+ len1
+ len2
+ len3
) = '\0';
173 /* Print a message on stdout. */
176 message (prefix
, s1
, s2
, s3
, s4
, s5
, s6
)
178 char *s1
, *s2
, *s3
, *s4
, *s5
, *s6
;
180 log_working_directory (1);
187 printf ("%s: ", program
);
189 printf ("%s[%u]: ", program
, makelevel
);
191 printf (s1
, s2
, s3
, s4
, s5
, s6
);
198 /* Print an error message and exit. */
202 fatal (s1
, s2
, s3
, s4
, s5
, s6
)
203 char *s1
, *s2
, *s3
, *s4
, *s5
, *s6
;
205 log_working_directory (1);
208 fprintf (stderr
, "%s: *** ", program
);
210 fprintf (stderr
, "%s[%u]: *** ", program
, makelevel
);
211 fprintf (stderr
, s1
, s2
, s3
, s4
, s5
, s6
);
212 fputs (". Stop.\n", stderr
);
217 /* Print error message. `s1' is printf control string, `s2' is arg for it. */
222 error (s1
, s2
, s3
, s4
, s5
, s6
)
223 char *s1
, *s2
, *s3
, *s4
, *s5
, *s6
;
225 log_working_directory (1);
228 fprintf (stderr
, "%s: ", program
);
230 fprintf (stderr
, "%s[%u]: ", program
, makelevel
);
231 fprintf (stderr
, s1
, s2
, s3
, s4
, s5
, s6
);
237 makefile_error (file
, lineno
, s1
, s2
, s3
, s4
, s5
, s6
)
240 char *s1
, *s2
, *s3
, *s4
, *s5
, *s6
;
242 log_working_directory (1);
244 fprintf (stderr
, "%s:%u: ", file
, lineno
);
245 fprintf (stderr
, s1
, s2
, s3
, s4
, s5
, s6
);
251 makefile_fatal (file
, lineno
, s1
, s2
, s3
, s4
, s5
, s6
)
254 char *s1
, *s2
, *s3
, *s4
, *s5
, *s6
;
256 log_working_directory (1);
258 fprintf (stderr
, "%s:%u: *** ", file
, lineno
);
259 fprintf (stderr
, s1
, s2
, s3
, s4
, s5
, s6
);
260 fputs (". Stop.\n", stderr
);
265 #ifndef HAVE_STRERROR
273 extern int errno
, sys_nerr
;
275 extern char *sys_errlist
[];
277 static char buf
[] = "Unknown error 12345678901234567890";
279 if (errno
< sys_nerr
)
280 return sys_errlist
[errnum
];
282 sprintf (buf
, "Unknown error %d", errnum
);
287 /* Print an error message from errno. */
290 perror_with_name (str
, name
)
293 error ("%s%s: %s", str
, name
, strerror (errno
));
296 /* Print an error message from errno and exit. */
299 pfatal_with_name (name
)
302 fatal ("%s: %s", name
, strerror (errno
));
307 /* Like malloc but get fatal error if memory is exhausted. */
316 char *result
= (char *) malloc (size
);
318 fatal ("virtual memory exhausted");
328 char *result
= (char *) realloc (ptr
, size
);
330 fatal ("virtual memory exhausted");
335 savestring (str
, length
)
339 register char *out
= (char *) xmalloc (length
+ 1);
341 bcopy (str
, out
, length
);
346 /* Search string BIG (length BLEN) for an occurrence of
347 string SMALL (length SLEN). Return a pointer to the
348 beginning of the first occurrence, or return nil if none found. */
351 sindex (big
, blen
, small
, slen
)
357 register unsigned int b
;
362 slen
= strlen (small
);
364 for (b
= 0; b
< blen
; ++b
)
365 if (big
[b
] == *small
&& !strncmp (&big
[b
+ 1], small
+ 1, slen
- 1))
372 Search through the string STRING, which ends at LIMIT, for the character C.
373 Returns a pointer to the first occurrence, or nil if none is found.
374 Like INDEX except that the string searched ends where specified
375 instead of at the first null. */
379 register char *s
, *limit
;
389 /* Return the address of the first whitespace or null in the string S. */
395 while (*s
!= '\0' && !isblank (*s
))
400 /* Return the address of the first nonwhitespace or null in the string S. */
406 register char *p
= s
;
413 /* Find the next token in PTR; return the address of it, and store the
414 length of the token into *LENGTHPTR if LENGTHPTR is not nil. */
417 find_next_token (ptr
, lengthptr
)
419 unsigned int *lengthptr
;
421 char *p
= next_token (*ptr
);
427 *ptr
= end
= end_of_token (p
);
429 *lengthptr
= end
- p
;
433 /* Copy a chain of `struct dep', making a new chain
434 with the same contents as the old one. */
438 register struct dep
*d
;
440 register struct dep
*c
;
441 struct dep
*firstnew
= 0;
446 c
= (struct dep
*) xmalloc (sizeof (struct dep
));
447 bcopy ((char *) d
, (char *) c
, sizeof (struct dep
));
449 c
->name
= savestring (c
->name
, strlen (c
->name
));
452 firstnew
= lastnew
= c
;
454 lastnew
= lastnew
->next
= c
;
463 /* The losing compiler on this machine can't handle this macro. */
469 return dep
->name
== 0 ? dep
->file
->name
: dep
->name
;
473 #ifdef GETLOADAVG_PRIVILEGED
477 /* Hopefully if a system says it's POSIX.1 and has the setuid and setgid
478 functions, they work as POSIX.1 says. Some systems (Alpha OSF/1 1.2,
479 for example) which claim to be POSIX.1 also have the BSD setreuid and
480 setregid functions, but they don't work as in BSD and only the POSIX.1
486 #else /* Not POSIX. */
488 /* Some POSIX.1 systems have the seteuid and setegid functions. In a
489 POSIX-like system, they are the best thing to use. However, some
490 non-POSIX systems have them too but they do not work in the POSIX style
491 and we must use setreuid and setregid instead. */
498 #ifndef HAVE_UNISTD_H
499 extern int getuid (), getgid (), geteuid (), getegid ();
500 extern int setuid (), setgid ();
502 extern int seteuid ();
505 extern int setreuid ();
506 #endif /* Have setreuid. */
507 #endif /* Have seteuid. */
509 extern int setegid ();
512 extern int setregid ();
513 #endif /* Have setregid. */
514 #endif /* Have setegid. */
515 #endif /* No <unistd.h>. */
517 /* Keep track of the user and group IDs for user- and make- access. */
518 static int user_uid
= -1, user_gid
= -1, make_uid
= -1, make_gid
= -1;
519 #define access_inited (user_uid != -1)
520 static enum { make
, user
} current_access
;
523 /* Under -d, write a message describing the current IDs. */
532 /* All the other debugging messages go to stdout,
533 but we write this one to stderr because it might be
534 run in a child fork whose stdout is piped. */
536 fprintf (stderr
, "%s access: user %d (real %d), group %d (real %d)\n",
537 flavor
, geteuid (), getuid (), getegid (), getgid ());
546 user_uid
= getuid ();
547 user_gid
= getgid ();
549 make_uid
= geteuid ();
550 make_gid
= getegid ();
552 /* Do these ever fail? */
553 if (user_uid
== -1 || user_gid
== -1 || make_uid
== -1 || make_gid
== -1)
554 pfatal_with_name ("get{e}[gu]id");
556 log_access ("Initialized");
558 current_access
= make
;
562 #endif /* GETLOADAVG_PRIVILEGED */
564 /* Give the process appropriate permissions for access to
565 user data (i.e., to stat files, or to spawn a child process). */
569 #ifdef GETLOADAVG_PRIVILEGED
574 if (current_access
== user
)
577 /* We are in "make access" mode. This means that the effective user and
578 group IDs are those of make (if it was installed setuid or setgid).
579 We now want to set the effective user and group IDs to the real IDs,
580 which are the IDs of the process that exec'd make. */
584 /* Modern systems have the seteuid/setegid calls which set only the
585 effective IDs, which is ideal. */
587 if (seteuid (user_uid
) < 0)
588 pfatal_with_name ("user_access: seteuid");
590 #else /* Not HAVE_SETEUID. */
592 #ifndef HAVE_SETREUID
594 /* System V has only the setuid/setgid calls to set user/group IDs.
595 There is an effective ID, which can be set by setuid/setgid.
596 It can be set (unless you are root) only to either what it already is
597 (returned by geteuid/getegid, now in make_uid/make_gid),
598 the real ID (return by getuid/getgid, now in user_uid/user_gid),
599 or the saved set ID (what the effective ID was before this set-ID
600 executable (make) was exec'd). */
602 if (setuid (user_uid
) < 0)
603 pfatal_with_name ("user_access: setuid");
605 #else /* HAVE_SETREUID. */
607 /* In 4BSD, the setreuid/setregid calls set both the real and effective IDs.
608 They may be set to themselves or each other. So you have two alternatives
609 at any one time. If you use setuid/setgid, the effective will be set to
610 the real, leaving only one alternative. Using setreuid/setregid, however,
611 you can toggle between your two alternatives by swapping the values in a
612 single setreuid or setregid call. */
614 if (setreuid (make_uid
, user_uid
) < 0)
615 pfatal_with_name ("user_access: setreuid");
617 #endif /* Not HAVE_SETREUID. */
618 #endif /* HAVE_SETEUID. */
621 if (setegid (user_gid
) < 0)
622 pfatal_with_name ("user_access: setegid");
624 #ifndef HAVE_SETREGID
625 if (setgid (user_gid
) < 0)
626 pfatal_with_name ("user_access: setgid");
628 if (setregid (make_gid
, user_gid
) < 0)
629 pfatal_with_name ("user_access: setregid");
633 current_access
= user
;
637 #endif /* GETLOADAVG_PRIVILEGED */
640 /* Give the process appropriate permissions for access to
641 make data (i.e., the load average). */
645 #ifdef GETLOADAVG_PRIVILEGED
650 if (current_access
== make
)
653 /* See comments in user_access, above. */
656 if (seteuid (make_uid
) < 0)
657 pfatal_with_name ("make_access: seteuid");
659 #ifndef HAVE_SETREUID
660 if (setuid (make_uid
) < 0)
661 pfatal_with_name ("make_access: setuid");
663 if (setreuid (user_uid
, make_uid
) < 0)
664 pfatal_with_name ("make_access: setreuid");
669 if (setegid (make_gid
) < 0)
670 pfatal_with_name ("make_access: setegid");
672 #ifndef HAVE_SETREGID
673 if (setgid (make_gid
) < 0)
674 pfatal_with_name ("make_access: setgid");
676 if (setregid (user_gid
, make_gid
) < 0)
677 pfatal_with_name ("make_access: setregid");
681 current_access
= make
;
685 #endif /* GETLOADAVG_PRIVILEGED */
688 /* Give the process appropriate permissions for a child process.
689 This is like user_access, but you can't get back to make_access. */
693 #ifdef GETLOADAVG_PRIVILEGED
698 /* Set both the real and effective UID and GID to the user's.
699 They cannot be changed back to make's. */
701 #ifndef HAVE_SETREUID
702 if (setuid (user_uid
) < 0)
703 pfatal_with_name ("child_access: setuid");
705 if (setreuid (user_uid
, user_uid
) < 0)
706 pfatal_with_name ("child_access: setreuid");
709 #ifndef HAVE_SETREGID
710 if (setgid (user_gid
) < 0)
711 pfatal_with_name ("child_access: setgid");
713 if (setregid (user_gid
, user_gid
) < 0)
714 pfatal_with_name ("child_access: setregid");
717 log_access ("Child");
719 #endif /* GETLOADAVG_PRIVILEGED */
722 #ifdef NEED_GET_PATH_MAX
726 static unsigned int value
;
730 long int x
= pathconf ("/", _PC_PATH_MAX
);