/* 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