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/* Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993 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;
{
register char *p, *p2;
register int backslash;
register unsigned int bs_write;
while (1)
{
p = index (line, '#');
if (p == 0)
break;
backslash = 0;
bs_write = 0;
for (p2 = p - 1; p2 > line && *p2 == '\\'; --p2)
{
if (backslash)
++bs_write;
backslash = !backslash;
}
if (!backslash)
{
/* Cut off the line at the #. */
*p = '\0';
break;
}
/* strcpy better copy left to right. */
line = p;
strcpy (p2 + 1 + bs_write, line);
}
}
/* 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 (s1, s2, s3, s4, s5, s6)
char *s1, *s2, *s3, *s4, *s5, *s6;
{
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;
{
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 (1);
}
/* 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;
{
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;
{
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;
{
fprintf (stderr, "%s:%u: *** ", file, lineno);
fprintf (stderr, s1, s2, s3, s4, s5, s6);
fputs (". Stop.\n", stderr);
die (1);
}
/* Print an error message from errno. */
void
perror_with_name (str, name)
char *str, *name;
{
extern int errno, sys_nerr;
extern char *sys_errlist[];
if (errno < sys_nerr)
error ("%s%s: %s", str, name, sys_errlist[errno]);
else
error ("%s%s: Unknown error %d", str, name, errno);
}
/* Print an error message from errno and exit. */
void
pfatal_with_name (name)
char *name;
{
extern int errno, sys_nerr;
extern char *sys_errlist[];
if (errno < sys_nerr)
fatal ("%s: %s", name, sys_errlist[errno]);
else
fatal ("%s: Unknown error %d", name, 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;
{
register char *p = s;
register int backslash = 0;
while (*p != '\0' && (backslash || !isblank (*p)))
{
if (*p++ == '\\')
{
backslash = !backslash;
while (*p == '\\')
{
backslash = !backslash;
++p;
}
}
else
backslash = 0;
}
return p;
}
/* 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
#ifndef HAVE_UNISTD_H
extern int getuid (), getgid (), geteuid (), getegid ();
extern int setuid (), setgid ();
#ifdef HAVE_SETREUID
extern int setreuid ();
#endif /* Have setreuid. */
#ifdef HAVE_SETREGID
extern int setregid ();
#endif /* Have setregid. */
#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;
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");
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. */
#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
/* 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
#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
current_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. */
#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
#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
current_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
/* 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
#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
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