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/* Miscellaneous generic support functions for GNU Make.
Copyright (C) 1988-2014 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 3 of the License, 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
this program. If not, see <http://www.gnu.org/licenses/>. */
#include "makeint.h"
#include "filedef.h"
#include "dep.h"
#include "debug.h"
/* GNU make no longer supports pre-ANSI89 environments. */
#include <stdarg.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#else
# include <sys/file.h>
#endif
/* 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 (const void *v1, const void *v2)
{
const char *s1 = *((char **)v1);
const char *s2 = *((char **)v2);
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 (char *line)
{
char *in, *out, *p;
in = strchr (line, '\n');
if (in == 0)
return;
out = in;
while (out > line && 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. */
unsigned int backslash = 0;
unsigned int 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 (backslash)
{
/* Backslash/newline handling:
In traditional GNU make all trailing whitespace, consecutive
backslash/newlines, and any leading whitespace on the next line
is reduced to a single space.
In POSIX, each backslash/newline and is replaced by a space. */
in = next_token (in);
if (! posix_pedantic)
while (out > line && isblank ((unsigned char)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';
}
/* Print N spaces (used in debug for target-depth). */
void
print_spaces (unsigned int n)
{
while (n-- > 0)
putchar (' ');
}
/* Return a string whose contents concatenate the NUM strings provided
This string lives in static, re-used memory. */
const char *
concat (unsigned int num, ...)
{
static unsigned int rlen = 0;
static char *result = NULL;
unsigned int ri = 0;
va_list args;
va_start (args, num);
while (num-- > 0)
{
const char *s = va_arg (args, const char *);
unsigned int l = xstrlen (s);
if (l == 0)
continue;
if (ri + l > rlen)
{
rlen = ((rlen ? rlen : 60) + l) * 2;
result = xrealloc (result, rlen);
}
memcpy (result + ri, s, l);
ri += l;
}
va_end (args);
/* Get some more memory if we don't have enough space for the
terminating '\0'. */
if (ri == rlen)
{
rlen = (rlen ? rlen : 60) * 2;
result = xrealloc (result, rlen);
}
result[ri] = '\0';
return result;
}
#ifndef HAVE_STRERROR
#undef strerror
char *
strerror (int errnum)
{
extern int errno, sys_nerr;
#ifndef __DECC
extern char *sys_errlist[];
#endif
static char buf[] = "Unknown error 12345678901234567890";
if (errno < sys_nerr)
return sys_errlist[errnum];
sprintf (buf, _("Unknown error %d"), errnum);
return buf;
}
#endif
/* 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 (const char *s, const char *limit, int c)
{
while (s < limit)
if (*s++ == c)
return (char *)(s - 1);
return 0;
}
/* Return the address of the first whitespace or null in the string S. */
char *
end_of_token (const char *s)
{
while (! STOP_SET (*s, MAP_BLANK|MAP_NUL))
++s;
return (char *)s;
}
/* Return the address of the first nonwhitespace or null in the string S. */
char *
next_token (const char *s)
{
while (isblank ((unsigned char)*s))
++s;
return (char *)s;
}
/* 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. Set *PTR to the end
of the token, so this function can be called repeatedly in a loop. */
char *
find_next_token (const char **ptr, unsigned int *lengthptr)
{
const char *p = next_token (*ptr);
if (*p == '\0')
return 0;
*ptr = end_of_token (p);
if (lengthptr != 0)
*lengthptr = *ptr - p;
return (char *)p;
}
/* Copy a chain of 'struct dep'. For 2nd expansion deps, dup the name. */
struct dep *
copy_dep_chain (const struct dep *d)
{
struct dep *firstnew = 0;
struct dep *lastnew = 0;
while (d != 0)
{
struct dep *c = xmalloc (sizeof (struct dep));
memcpy (c, d, sizeof (struct dep));
if (c->need_2nd_expansion)
c->name = xstrdup (c->name);
c->next = 0;
if (firstnew == 0)
firstnew = lastnew = c;
else
lastnew = lastnew->next = c;
d = d->next;
}
return firstnew;
}
/* Free a chain of 'struct dep'. */
void
free_dep_chain (struct dep *d)
{
while (d != 0)
{
struct dep *df = d;
d = d->next;
free_dep (df);
}
}
/* Free a chain of struct nameseq.
For struct dep chains use free_dep_chain. */
void
free_ns_chain (struct nameseq *ns)
{
while (ns != 0)
{
struct nameseq *t = ns;
ns = ns->next;
free (t);
}
}
#if !HAVE_STRCASECMP && !HAVE_STRICMP && !HAVE_STRCMPI
/* If we don't have strcasecmp() (from POSIX), or anything that can substitute
for it, define our own version. */
int
strcasecmp (const char *s1, const char *s2)
{
while (1)
{
int c1 = (int) *(s1++);
int c2 = (int) *(s2++);
if (isalpha (c1))
c1 = tolower (c1);
if (isalpha (c2))
c2 = tolower (c2);
if (c1 != '\0' && c1 == c2)
continue;
return (c1 - c2);
}
}
#endif
#if !HAVE_STRNCASECMP && !HAVE_STRNICMP && !HAVE_STRNCMPI
/* If we don't have strncasecmp() (from POSIX), or anything that can
substitute for it, define our own version. */
int
strncasecmp (const char *s1, const char *s2, int n)
{
while (n-- > 0)
{
int c1 = (int) *(s1++);
int c2 = (int) *(s2++);
if (isalpha (c1))
c1 = tolower (c1);
if (isalpha (c2))
c2 = tolower (c2);
if (c1 != '\0' && c1 == c2)
continue;
return (c1 - c2);
}
return 0;
}
#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 (const char *flavor)
{
if (! ISDB (DB_JOBS))
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: user %lu (real %lu), group %lu (real %lu)\n"),
flavor, (unsigned long) geteuid (), (unsigned long) getuid (),
(unsigned long) getegid (), (unsigned long) getgid ());
fflush (stderr);
}
static void
init_access (void)
{
#ifndef VMS
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 access"));
current_access = make;
#endif
}
#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 (void)
{
#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 access"));
#endif /* GETLOADAVG_PRIVILEGED */
}
/* Give the process appropriate permissions for access to
make data (i.e., the load average). */
void
make_access (void)
{
#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 access"));
#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 (void)
{
#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 access"));
#endif /* GETLOADAVG_PRIVILEGED */
}
#ifdef NEED_GET_PATH_MAX
unsigned int
get_path_max (void)
{
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
/* Map of possible stop characters for searching strings. */
#ifndef UCHAR_MAX
# define UCHAR_MAX 255
#endif
unsigned short stopchar_map[UCHAR_MAX + 1] = {0};
/* This character map locate stop chars when parsing GNU makefiles.
Each element is true if we should stop parsing on that character. */
extern void
initialize_stopchar_map ()
{
int i;
stopchar_map[(int)'\0'] = MAP_NUL;
stopchar_map[(int)'#'] = MAP_COMMENT;
stopchar_map[(int)';'] = MAP_SEMI;
stopchar_map[(int)'='] = MAP_EQUALS;
stopchar_map[(int)':'] = MAP_COLON;
stopchar_map[(int)'%'] = MAP_PERCENT;
stopchar_map[(int)'|'] = MAP_PIPE;
stopchar_map[(int)'.'] = MAP_DOT | MAP_USERFUNC;
stopchar_map[(int)','] = MAP_COMMA;
stopchar_map[(int)'$'] = MAP_VARIABLE;
stopchar_map[(int)'-'] = MAP_USERFUNC;
stopchar_map[(int)'_'] = MAP_USERFUNC;
stopchar_map[(int)'/'] = MAP_DIRSEP;
#if defined(VMS)
stopchar_map[(int)']'] = MAP_DIRSEP;
#elif defined(HAVE_DOS_PATHS)
stopchar_map[(int)'\\'] = MAP_DIRSEP;
#endif
for (i = 1; i <= UCHAR_MAX; ++i)
{
if (isblank(i))
stopchar_map[i] = MAP_BLANK;
if (isspace(i))
stopchar_map[i] |= MAP_SPACE;
if (isalnum(i))
stopchar_map[i] = MAP_USERFUNC;
}
}
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