/* filesubr.c --- subroutines for dealing with files Jim Blandy This file is part of GNU CVS. GNU CVS 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. This program 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. */ /* These functions were moved out of subr.c because they need different definitions under operating systems (like, say, Windows NT) with different file system semantics. */ #include #include #include "cvs.h" static int deep_remove_dir PROTO((const char *path)); /* Copies "from" to "to". Note that the functionality here is similar to the win32 function CopyFile, but (1) we copy LastAccessTime and CopyFile doesn't, (2) we set file attributes to the default set by the C library and CopyFile copies them. Neither #1 nor #2 was intentional as far as I know, but changing them could be confusing, unless there is some reason they should be changed (this would need more investigation). */ void copy_file (from, to) const char *from; const char *to; { struct stat sb; struct utimbuf t; int fdin, fdout; if (trace) #ifdef SERVER_SUPPORT (void) fprintf (stderr, "%c-> copy(%s,%s)\n", (server_active) ? 'S' : ' ', from, to); #else (void) fprintf (stderr, "-> copy(%s,%s)\n", from, to); #endif if (noexec) return; if ((fdin = open (from, O_RDONLY | O_BINARY)) < 0) error (1, errno, "cannot open %s for copying", from); if (fstat (fdin, &sb) < 0) error (1, errno, "cannot fstat %s", from); if ((fdout = open (to, O_CREAT | O_TRUNC | O_RDWR | O_BINARY, (int) sb.st_mode & 07777)) < 0) error (1, errno, "cannot create %s for copying", to); if (sb.st_size > 0) { char buf[BUFSIZ]; int n; for (;;) { n = read (fdin, buf, sizeof(buf)); if (n == -1) { #ifdef EINTR if (errno == EINTR) continue; #endif error (1, errno, "cannot read file %s for copying", from); } else if (n == 0) break; if (write(fdout, buf, n) != n) { error (1, errno, "cannot write file %s for copying", to); } } #ifdef HAVE_FSYNC if (fsync (fdout)) error (1, errno, "cannot fsync file %s after copying", to); #endif } if (close (fdin) < 0) error (0, errno, "cannot close %s", from); if (close (fdout) < 0) error (1, errno, "cannot close %s", to); /* now, set the times for the copied file to match those of the original */ memset ((char *) &t, 0, sizeof (t)); t.actime = sb.st_atime; t.modtime = sb.st_mtime; (void) utime (to, &t); } /* FIXME-krp: these functions would benefit from caching the char * & stat buf. */ /* * Returns non-zero if the argument file is a directory, or is a symbolic * link which points to a directory. */ int isdir (file) const char *file; { struct stat sb; if (stat (file, &sb) < 0) return (0); return (S_ISDIR (sb.st_mode)); } /* * Returns non-zero if the argument file is a symbolic link. */ int islink (file) const char *file; { #ifdef S_ISLNK struct stat sb; if (lstat (file, &sb) < 0) return (0); return (S_ISLNK (sb.st_mode)); #else return (0); #endif } /* * Returns non-zero if the argument file exists. */ int isfile (file) const char *file; { return isaccessible(file, F_OK); } /* * Returns non-zero if the argument file is readable. */ int isreadable (file) const char *file; { return isaccessible(file, R_OK); } /* * Returns non-zero if the argument file is writable. */ int iswritable (file) const char *file; { return isaccessible(file, W_OK); } /* * Returns non-zero if the argument file is accessable according to * mode. If compiled with SETXID_SUPPORT also works if cvs has setxid * bits set. */ int isaccessible (file, mode) const char *file; const int mode; { #ifdef SETXID_SUPPORT struct stat sb; int umask = 0; int gmask = 0; int omask = 0; int uid; if (stat(file, &sb) == -1) return 0; if (mode == F_OK) return 1; uid = geteuid(); if (uid == 0) /* superuser */ { if (mode & X_OK) return sb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH); else return 1; } if (mode & R_OK) { umask |= S_IRUSR; gmask |= S_IRGRP; omask |= S_IROTH; } if (mode & W_OK) { umask |= S_IWUSR; gmask |= S_IWGRP; omask |= S_IWOTH; } if (mode & X_OK) { umask |= S_IXUSR; gmask |= S_IXGRP; omask |= S_IXOTH; } if (sb.st_uid == uid) return (sb.st_mode & umask) == umask; else if (sb.st_gid == getegid()) return (sb.st_mode & gmask) == gmask; else return (sb.st_mode & omask) == omask; #else return access(file, mode) == 0; #endif } /* * Open a file and die if it fails */ FILE * open_file (name, mode) const char *name; const char *mode; { FILE *fp; if ((fp = fopen (name, mode)) == NULL) error (1, errno, "cannot open %s", name); return (fp); } /* * Make a directory and die if it fails */ void make_directory (name) const char *name; { struct stat sb; if (stat (name, &sb) == 0 && (!S_ISDIR (sb.st_mode))) error (0, 0, "%s already exists but is not a directory", name); if (!noexec && mkdir (name) < 0) error (1, errno, "cannot make directory %s", name); } /* * Make a path to the argument directory, printing a message if something * goes wrong. */ void make_directories (name) const char *name; { char *cp; if (noexec) return; if (mkdir (name) == 0 || errno == EEXIST) return; if (errno != ENOENT) { error (0, errno, "cannot make path to %s", name); return; } if ((cp = strrchr (name, '/')) == NULL) return; *cp = '\0'; make_directories (name); *cp++ = '/'; if (*cp == '\0') return; (void) mkdir (name); } /* Create directory NAME if it does not already exist; fatal error for other errors. Returns 0 if directory was created; 1 if it already existed. */ int mkdir_if_needed (name) char *name; { if (mkdir (name) < 0) { if (errno != EEXIST #ifdef EACCESS /* This was copied over from the OS/2 code; I would guess it isn't needed here but that has not been verified. */ && errno != EACCESS #endif #ifdef EACCES /* This is said to be needed by NT on Alpha or PowerPC (not sure what version) --August, 1996. */ && errno != EACCES #endif ) error (1, errno, "cannot make directory %s", name); return 1; } return 0; } /* * Change the mode of a file, either adding write permissions, or removing * all write permissions. Adding write permissions honors the current umask * setting. */ void xchmod (fname, writable) char *fname; int writable; { struct stat sb; mode_t mode, oumask; if (stat (fname, &sb) < 0) { if (!noexec) error (0, errno, "cannot stat %s", fname); return; } if (writable) { oumask = umask (0); (void) umask (oumask); mode = sb.st_mode | ~oumask & (((sb.st_mode & S_IRUSR) ? S_IWUSR : 0) | ((sb.st_mode & S_IRGRP) ? S_IWGRP : 0) | ((sb.st_mode & S_IROTH) ? S_IWOTH : 0)); } else { mode = sb.st_mode & ~(S_IWRITE | S_IWGRP | S_IWOTH); } if (trace) #ifdef SERVER_SUPPORT (void) fprintf (stderr, "%c-> chmod(%s,%o)\n", (server_active) ? 'S' : ' ', fname, mode); #else (void) fprintf (stderr, "-> chmod(%s,%o)\n", fname, mode); #endif if (noexec) return; if (chmod (fname, mode) < 0) error (0, errno, "cannot change mode of file %s", fname); } /* Read the value of a symbolic link. Under Windows NT, this function always returns EINVAL. */ int readlink (char *path, char *buf, int buf_size) { errno = EINVAL; return -1; } /* Rename for NT which works for read only files. Apparently if we are accessing FROM and TO via a Novell network, this is an issue. */ int wnt_rename (from, to) const char *from; const char *to; { int result, save_errno; int readonly = !iswritable (from); if (readonly) { if (chmod (from, S_IWRITE) < 0) return -1; } result = rename (from, to); save_errno = errno; if (readonly) { if (result == 0) { if (chmod (to, S_IREAD) < 0) return -1; } else { /* We have a choice of which error to report, if there is one here too; report the one from rename (). */ chmod (from, S_IREAD); } errno = save_errno; } return result; } /* * Rename a file and die if it fails */ void rename_file (from, to) const char *from; const char *to; { if (trace) #ifdef SERVER_SUPPORT (void) fprintf (stderr, "%c-> rename(%s,%s)\n", (server_active) ? 'S' : ' ', from, to); #else (void) fprintf (stderr, "-> rename(%s,%s)\n", from, to); #endif if (noexec) return; /* Win32 unlink is stupid --- it fails if the file is read-only */ chmod(to, S_IWRITE); unlink(to); if (CVS_RENAME (from, to) < 0) error (1, errno, "cannot rename file %s to %s", from, to); } /* * unlink a file, if possible. */ int unlink_file (f) const char *f; { if (trace) #ifdef SERVER_SUPPORT (void) fprintf (stderr, "%c-> unlink(%s)\n", (server_active) ? 'S' : ' ', f); #else (void) fprintf (stderr, "-> unlink(%s)\n", f); #endif if (noexec) return (0); /* Win32 unlink is stupid - it fails if the file is read-only */ chmod (f, _S_IWRITE); return (unlink (f)); } /* * Unlink a file or dir, if possible. If it is a directory do a deep * removal of all of the files in the directory. Return -1 on error * (in which case errno is set). */ int unlink_file_dir (f) const char *f; { if (trace) #ifdef SERVER_SUPPORT (void) fprintf (stderr, "%c-> unlink_file_dir(%s)\n", (server_active) ? 'S' : ' ', f); #else (void) fprintf (stderr, "-> unlink_file_dir(%s)\n", f); #endif if (noexec) return (0); /* Win32 unlink is stupid - it fails if the file is read-only */ chmod (f, _S_IWRITE); if (unlink (f) != 0) { /* under Windows NT, unlink returns EACCES if the path is a directory. Under Windows 95, ENOENT. */ if (errno == EISDIR || errno == EACCES || errno == ENOENT) return deep_remove_dir (f); else /* The file wasn't a directory and some other * error occured */ return -1; } /* We were able to remove the file from the disk */ return 0; } /* Remove a directory and everything it contains. Returns 0 for * success, -1 for failure (in which case errno is set). */ static int deep_remove_dir (path) const char *path; { DIR *dirp; struct dirent *dp; char buf[PATH_MAX]; /* ENOTEMPTY for NT (obvious) but EACCES for Win95 (not obvious) */ if (rmdir (path) != 0 && (errno == ENOTEMPTY || errno == EACCES)) { if ((dirp = opendir (path)) == NULL) /* If unable to open the directory return * an error */ return -1; while ((dp = readdir (dirp)) != NULL) { if (strcmp (dp->d_name, ".") == 0 || strcmp (dp->d_name, "..") == 0) continue; sprintf (buf, "%s/%s", path, dp->d_name); /* Win32 unlink is stupid - it fails if the file is read-only */ chmod (buf, _S_IWRITE); if (unlink (buf) != 0 ) { /* Under Windows NT, unlink returns EACCES if the path is a directory. Under Windows 95, ENOENT. It isn't really clear to me whether checking errno is better or worse than using _stat to check for a directory. We aren't really trying to prevent race conditions here (e.g. what if something changes between readdir and unlink?) */ if (errno == EISDIR || errno == EACCES || errno == ENOENT) { if (deep_remove_dir (buf)) { closedir (dirp); return -1; } } else { /* buf isn't a directory, or there are * some sort of permision problems */ closedir (dirp); return -1; } } } closedir (dirp); return rmdir (path); } /* Was able to remove the directory return 0 */ return 0; } /* Read NCHARS bytes from descriptor FD into BUF. Return the number of characters successfully read. The number returned is always NCHARS unless end-of-file or error. */ static size_t block_read (fd, buf, nchars) int fd; char *buf; size_t nchars; { char *bp = buf; size_t nread; do { nread = read (fd, bp, nchars); if (nread == (size_t)-1) { #ifdef EINTR if (errno == EINTR) continue; #endif return (size_t)-1; } if (nread == 0) break; bp += nread; nchars -= nread; } while (nchars != 0); return bp - buf; } /* * Compare "file1" to "file2". Return non-zero if they don't compare exactly. */ int xcmp (file1, file2) const char *file1; const char *file2; { char *buf1, *buf2; struct stat sb1, sb2; int fd1, fd2; int ret; if ((fd1 = open (file1, O_RDONLY | O_BINARY)) < 0) error (1, errno, "cannot open file %s for comparing", file1); if ((fd2 = open (file2, O_RDONLY | O_BINARY)) < 0) error (1, errno, "cannot open file %s for comparing", file2); if (fstat (fd1, &sb1) < 0) error (1, errno, "cannot fstat %s", file1); if (fstat (fd2, &sb2) < 0) error (1, errno, "cannot fstat %s", file2); /* A generic file compare routine might compare st_dev & st_ino here to see if the two files being compared are actually the same file. But that won't happen in CVS, so we won't bother. */ if (sb1.st_size != sb2.st_size) ret = 1; else if (sb1.st_size == 0) ret = 0; else { /* FIXME: compute the optimal buffer size by computing the least common multiple of the files st_blocks field */ size_t buf_size = 8 * 1024; size_t read1; size_t read2; buf1 = xmalloc (buf_size); buf2 = xmalloc (buf_size); do { read1 = block_read (fd1, buf1, buf_size); if (read1 == (size_t)-1) error (1, errno, "cannot read file %s for comparing", file1); read2 = block_read (fd2, buf2, buf_size); if (read2 == (size_t)-1) error (1, errno, "cannot read file %s for comparing", file2); /* assert (read1 == read2); */ ret = memcmp(buf1, buf2, read1); } while (ret == 0 && read1 == buf_size); free (buf1); free (buf2); } (void) close (fd1); (void) close (fd2); return (ret); } /* Generate a unique temporary filename. Returns a pointer to a newly malloc'd string containing the name. Returns successfully or not at all. */ char * cvs_temp_name () { char *retval; retval = _tempnam (NULL, NULL); if (retval == NULL) error (1, errno, "cannot generate temporary filename"); return retval; } /* Return non-zero iff FILENAME is absolute. Trivial under Unix, but more complicated under other systems. */ int isabsolute (filename) const char *filename; { /* FIXME: This routine seems to interact poorly with strip_trailing_slashes. For example, specify ":local:r:\" as CVSROOT. The CVS/Root file will contain ":local:r:" and then isabsolute will complain about the root not being an absolute pathname. My guess is that strip_trailing_slashes is the right place to fix this. */ return (ISDIRSEP (filename[0]) || (filename[0] != '\0' && filename[1] == ':' && ISDIRSEP (filename[2]))); } /* Return a pointer into PATH's last component. */ char * last_component (char *path) { char *scan; char *last = 0; for (scan = path; *scan; scan++) if (ISDIRSEP (*scan)) last = scan; if (last && (last != path)) return last + 1; else return path; } /* NT has two evironment variables, HOMEPATH and HOMEDRIVE, which, when combined as ${HOMEDRIVE}${HOMEPATH}, give the unix equivalent of HOME. Some NT users are just too unixy, though, and set the HOME variable themselves. Therefore, we check for HOME first, and then try to combine the other two if that fails. Looking for HOME strikes me as bogus, particularly if the only reason is to cater to "unixy users". On the other hand, if the reasoning is there should be a single variable, rather than requiring people to set both HOMEDRIVE and HOMEPATH, then it starts to make a little more sense. Win95: The system doesn't set HOME, HOMEDRIVE, or HOMEPATH (at least if you set it up as the "all users under one user ID" or whatever the name of that option is). Based on thing overheard on the net, it seems that users of the pserver client have gotten in the habit of setting HOME (if you don't use pserver, you can probably get away without having a reasonable return from get_homedir. Of course you lose .cvsrc and .cvsignore, but many users won't notice). So it would seem that we should be somewhat careful if we try to change the current behavior. NT 3.51 or NT 4.0: I haven't checked this myself, but I am told that HOME gets set, but not to the user's home directory. It is said to be set to c:\users\default by default. */ char * get_homedir () { static char *pathbuf; char *hd, *hp; if (pathbuf != NULL) return pathbuf; else if ((hd = getenv ("HOME"))) return hd; else if ((hd = getenv ("HOMEDRIVE")) && (hp = getenv ("HOMEPATH"))) { pathbuf = xmalloc (strlen (hd) + strlen (hp) + 5); strcpy (pathbuf, hd); strcat (pathbuf, hp); return pathbuf; } else return NULL; } /* See cvs.h for description. */ void expand_wild (argc, argv, pargc, pargv) int argc; char **argv; int *pargc; char ***pargv; { int i; int new_argc; char **new_argv; /* Allocated size of new_argv. We arrange it so there is always room for one more element. */ int max_new_argc; new_argc = 0; /* Add one so this is never zero. */ max_new_argc = argc + 1; new_argv = (char **) xmalloc (max_new_argc * sizeof (char *)); for (i = 0; i < argc; ++i) { HANDLE h; WIN32_FIND_DATA fdata; /* These variables help us extract the directory name from the given pathname. */ char *last_forw_slash, *last_back_slash, *end_of_dirname; int dirname_length = 0; /* FIXME: If argv[i] is ".", this code will expand it to the name of the current directory in its parent directory which will cause start_recursion to do all manner of strange things with it (culminating in an error). This breaks "cvs co .". As nearly as I can guess, this bug has existed since expand_wild was first created. At least, it is in CVS 1.9 (I just tried it). */ /* FindFirstFile doesn't return pathnames, so we have to do this ourselves. Luckily, it's no big deal, since globbing characters under Win32s can only occur in the last segment of the path. For example, /a/path/q*.h valid /w32/q*.dir/cant/do/this/q*.h invalid */ /* Win32 can handle both forward and backward slashes as filenames -- check for both. */ last_forw_slash = strrchr (argv[i], '/'); last_back_slash = strrchr (argv[i], '\\'); #define cvs_max(x,y) ((x >= y) ? (x) : (y)) /* FIXME: this comparing a NULL pointer to a non-NULL one is extremely ugly, and I strongly suspect *NOT* sanctioned by ANSI C. The code should just use last_component instead. */ end_of_dirname = cvs_max (last_forw_slash, last_back_slash); if (end_of_dirname == NULL) dirname_length = 0; /* no directory name */ else dirname_length = end_of_dirname - argv[i] + 1; /* include slash */ h = FindFirstFile (argv[i], &fdata); if (h == INVALID_HANDLE_VALUE) { if (GetLastError () == ENOENT) { /* No match. The file specified didn't contain a wildcard (in which case we clearly should return it unchanged), or it contained a wildcard which didn't match (in which case it might be better for it to be an error, but we don't try to do that). */ new_argv [new_argc++] = xstrdup (argv[i]); if (new_argc == max_new_argc) { max_new_argc *= 2; new_argv = xrealloc (new_argv, max_new_argc * sizeof (char *)); } } else { error (1, errno, "cannot find %s", argv[i]); } } else { while (1) { new_argv[new_argc] = (char *) xmalloc (strlen (fdata.cFileName) + 1 + dirname_length); /* Copy the directory name, if there is one. */ if (dirname_length) { strncpy (new_argv[new_argc], argv[i], dirname_length); new_argv[new_argc][dirname_length] = '\0'; } else new_argv[new_argc][0] = '\0'; /* Copy the file name. */ if (fncmp (argv[i] + dirname_length, fdata.cFileName) == 0) /* We didn't expand a wildcard; we just matched a filename. Use the file name as specified rather than the filename which exists in the directory (they may differ in case). This is needed to make cvs add on a directory consistently use the name specified on the command line, but it is probably a good idea in other contexts too. */ strcpy (new_argv[new_argc], argv[i]); else strcat (new_argv[new_argc], fdata.cFileName); new_argc++; if (new_argc == max_new_argc) { max_new_argc *= 2; new_argv = xrealloc (new_argv, max_new_argc * sizeof (char *)); } if (!FindNextFile (h, &fdata)) { if (GetLastError () == ERROR_NO_MORE_FILES) break; else error (1, errno, "cannot find %s", argv[i]); } } if (!FindClose (h)) error (1, GetLastError (), "cannot close %s", argv[i]); } } *pargc = new_argc; *pargv = new_argv; } static void check_statbuf (const char *file, struct stat *sb) { /* Win32 processes file times in a 64 bit format (see Win32 functions SetFileTime and GetFileTime). If the file time on a file doesn't fit into the 32 bit time_t format, then stat will set that time to -1. This would be OK, except that functions like ctime() don't check for validity. So what we do here is to give a error on -1. A cleaner solution might be to change CVS's interfaces to return a time in RCS format (for example), and then implement it on Win32 via GetFileTime, but that would be a lot of hair and I'm not sure there is much payoff. */ if (sb->st_mtime == (time_t) -1) error (1, 0, "invalid modification time for %s", file); if (sb->st_ctime == (time_t) -1) /* I'm not sure what this means on windows. It might be a creation time (unlike unix).... */ error (1, 0, "invalid ctime for %s", file); if (sb->st_atime == (time_t) -1) error (1, 0, "invalid access time for %s", file); } int wnt_stat (const char *file, struct stat *sb) { int retval; retval = stat (file, sb); if (retval < 0) return retval; check_statbuf (file, sb); return retval; } int wnt_lstat (const char *file, struct stat *sb) { int retval; retval = lstat (file, sb); if (retval < 0) return retval; check_statbuf (file, sb); return retval; }