/* filesubr.c --- subroutines for dealing with files Gratuitously adapted toward VMS quirks. Jim Blandy Benjamin J. Lee 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. */ #include "cvs.h" static int deep_remove_dir PROTO((const char *path)); /* * Copies "from" to "to". */ void copy_file (from_file, to_file) const char *from_file; const char *to_file; { char from[PATH_MAX], to[PATH_MAX]; struct stat sb; struct utimbuf t; int fdin, fdout; /* Prefer local relative paths to files at expense of logical name access to files. */ if (isabsolute(from_file)) strcpy(from, from_file); else sprintf(from, "./%s", from_file); if (isabsolute(to_file)) strcpy(to, to_file); else sprintf(to, "./%s", to_file); 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)) < 0) error (1, errno, "cannot open %s for copying", from); if (fstat (fdin, &sb) < 0) error (1, errno, "cannot fstat %s", from); if ((fdout = creat (to, (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, 0777) < 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, 0777) == 0 || errno == EEXIST) return; if (! existence_error (errno)) { 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, 0777); } /* 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, 0777) < 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 ) 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. Either change honors the current umask setting. */ void xchmod (fname_file, writable) char *fname_file; int writable; { char fname[PATH_MAX]; struct stat sb; mode_t mode, oumask; /* Prefer local relative paths to files at expense of logical name access to files. */ if (isabsolute(fname_file)) strcpy(fname, fname_file); else sprintf(fname, "./%s", fname_file); if (stat (fname, &sb) < 0) { if (!noexec) error (0, errno, "cannot stat %s", fname); return; } oumask = umask (0); (void) umask (oumask); if (writable) { 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) & ~oumask; } 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); } /* * Rename a file and die if it fails */ void rename_file (from_file, to_file) const char *from_file; const char *to_file; { char from[PATH_MAX], to[PATH_MAX]; /* Prefer local relative paths to files at expense of logical name access to files. */ if (isabsolute(from_file)) strcpy(from, from_file); else sprintf(from, "./%s", from_file); if (isabsolute(to_file)) strcpy(to, to_file); else sprintf(to, "./%s", to_file); 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; if (rename (from, to) < 0) error (1, errno, "cannot rename file %s to %s", from, to); } /* * link a file, if possible. */ int link_file (from_file, to_file) const char *from_file; const char *to_file; { char from[PATH_MAX], to[PATH_MAX]; /* Prefer local relative paths to files at expense of logical name access to files. */ if (isabsolute(from_file)) strcpy(from, from_file); else sprintf(from, "./%s", from_file); if (isabsolute(to_file)) strcpy(to, to_file); else sprintf(to, "./%s", to_file); if (trace) #ifdef SERVER_SUPPORT (void) fprintf (stderr, "%c-> link(%s,%s)\n", (server_active) ? 'S' : ' ', from, to); #else (void) fprintf (stderr, "-> link(%s,%s)\n", from, to); #endif if (noexec) return (0); return (link (from, to)); } /* * unlink a file, if possible. */ int unlink_file (f_file) const char *f_file; { char f[PATH_MAX]; /* Prefer local relative paths to files at expense of logical name access to files. */ if (isabsolute(f_file)) strcpy(f, f_file); else sprintf(f, "./%s", f_file); 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); 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_file) const char *f_file; { char f[PATH_MAX]; /* Prefer local relative paths to files at expense of logical name access to files. */ if (isabsolute(f_file)) strcpy(f, f_file); else sprintf(f, "./%s", f_file); 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); if (unlink (f) != 0) { /* under NEXTSTEP errno is set to return EPERM if * the file is a directory,or if the user is not * allowed to read or write to the file. * [This is probably a bug in the O/S] * other systems will return EISDIR to indicate * that the path is a directory. */ if (errno == EISDIR || errno == EPERM) 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]; if (rmdir (path) != 0 && (errno == ENOTEMPTY || errno == EEXIST)) { 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); if (unlink (buf) != 0 ) { if (errno == EISDIR || errno == EPERM) { 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_file, file2_file) const char *file1_file; const char *file2_file; { char file1[PATH_MAX], file2[PATH_MAX]; char *buf1, *buf2; struct stat sb1, sb2; int fd1, fd2; int ret; /* Prefer local relative paths to files at expense of logical name access to files. */ if (isabsolute(file1_file)) strcpy(file1, file1_file); else sprintf(file1, "./%s", file1_file); if (isabsolute(file2_file)) strcpy(file2, file2_file); else sprintf(file2, "./%s", file2_file); if ((fd1 = open (file1, O_RDONLY)) < 0) error (1, errno, "cannot open file %s for comparing", file1); if ((fd2 = open (file2, O_RDONLY)) < 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); } unsigned char VMS_filename_classes[] = { 0x00,0x01,0x02,0x03, 0x04,0x05,0x06,0x07, 0x08,0x09,0x0a,0x0b, 0x0c,0x0d,0x0e,0x0f, 0x10,0x11,0x12,0x13, 0x14,0x15,0x16,0x17, 0x18,0x19,0x1a,0x1b, 0x1c,0x1d,0x1e,0x1f, 0x20,0x21,0x22,0x23, 0x24,0x25,0x26,0x27, 0x28,0x29,0x2a,0x2b, 0x2c,0x2d,0x2e,0x2f, 0x30,0x31,0x32,0x33, 0x34,0x35,0x36,0x37, 0x38,0x39,0x3a,0x3b, 0x3c,0x3d,0x3e,0x3f, 0x40,0x61,0x62,0x63, 0x64,0x65,0x66,0x67, 0x68,0x69,0x6a,0x6b, 0x6c,0x6d,0x6e,0x6f, 0x70,0x71,0x72,0x73, 0x74,0x75,0x76,0x77, 0x78,0x79,0x7a,0x5b, 0x5c,0x5d,0x5e,0x5f, 0x60,0x61,0x62,0x63, 0x64,0x65,0x66,0x67, 0x68,0x69,0x6a,0x6b, 0x6c,0x6d,0x6e,0x6f, 0x70,0x71,0x72,0x73, 0x74,0x75,0x76,0x77, 0x78,0x79,0x7a,0x7b, 0x7c,0x7d,0x7e,0x7f, 0x80,0x81,0x82,0x83, 0x84,0x85,0x86,0x87, 0x88,0x89,0x8a,0x8b, 0x8c,0x8d,0x8e,0x8f, 0x90,0x91,0x92,0x93, 0x94,0x95,0x96,0x97, 0x98,0x99,0x9a,0x9b, 0x9c,0x9d,0x9e,0x9f, 0xa0,0xa1,0xa2,0xa3, 0xa4,0xa5,0xa6,0xa7, 0xa8,0xa9,0xaa,0xab, 0xac,0xad,0xae,0xaf, 0xb0,0xb1,0xb2,0xb3, 0xb4,0xb5,0xb6,0xb7, 0xb8,0xb9,0xba,0xbb, 0xbc,0xbd,0xbe,0xbf, 0xc0,0xc1,0xc2,0xc3, 0xc4,0xc5,0xc6,0xc7, 0xc8,0xc9,0xca,0xcb, 0xcc,0xcd,0xce,0xcf, 0xd0,0xd1,0xd2,0xd3, 0xd4,0xd5,0xd6,0xd7, 0xd8,0xd9,0xda,0xdb, 0xdc,0xdd,0xde,0xdf, 0xe0,0xe1,0xe2,0xe3, 0xe4,0xe5,0xe6,0xe7, 0xe8,0xe9,0xea,0xeb, 0xec,0xed,0xee,0xef, 0xf0,0xf1,0xf2,0xf3, 0xf4,0xf5,0xf6,0xf7, 0xf8,0xf9,0xfa,0xfb, 0xfc,0xfd,0xfe,0xff, }; /* Like strcmp, but with the appropriate tweaks for file names. Under VMS, filenames are case-insensitive but case-preserving. FIXME: this should compare y.tab.c equal with y_tab.c, at least if fnfold is modified (see below). */ int fncmp (const char *n1, const char *n2) { while (*n1 && *n2 && (VMS_filename_classes[(unsigned char) *n1] == VMS_filename_classes[(unsigned char) *n2])) n1++, n2++; return (VMS_filename_classes[(unsigned char) *n1] - VMS_filename_classes[(unsigned char) *n2]); } /* Fold characters in FILENAME to their canonical forms. FIXME: this probably should be mapping y.tab.c to y_tab.c but first we have to figure out whether fnfold is the right hook for that functionality (probable answer: yes, but it should not fold case on OS/2, VMS, or NT. You see, fnfold isn't called anywhere, so we can define it to mean whatever makes sense. Of course to solve the VMS y.tab.c problem we'd need to call it where appropriate. It would need to be redocumented as "fold to a form we can create in the filesystem" rather than "canonical form"). The idea is that files we create would get thusly munged, but CVS can cope with their names being different the same way that the NT port copes with it if the user renames a file from "foo" to "FOO". Alternately, this kind of handling could/should go into CVS_FOPEN and friends (if we want to do it like the Mac port, anyway). */ void fnfold (char *filename) { while (*filename) { *filename = FOLD_FN_CHAR (*filename); filename++; } } /* 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 value[L_tmpnam + 1]; char *retval; /* FIXME: what is the VMS equivalent to TMPDIR? */ retval = tmpnam (value); if (retval == NULL) error (1, errno, "cannot generate temporary filename"); return xstrdup (retval); } /* Return non-zero iff FILENAME is absolute. Trivial under Unix, but more complicated under other systems. */ int isabsolute (filename) const char *filename; { if(filename[0] == '/' || filename[0] == '[' || filename[0] == '<' || strchr(filename, ':')) return 1; else return 0; } /* Return a pointer into PATH's last component. */ char * last_component (path) char *path; { char *last = strrchr (path, '/'); if (last && (last != path)) return last + 1; else return path; } /* Return the home directory. Returns a pointer to storage managed by this function or its callees (currently getenv). */ char * get_homedir () { return getenv ("HOME"); } /* See cvs.h for description. On VMS this currently does nothing, although I think we should be expanding wildcards here. */ void expand_wild (argc, argv, pargc, pargv) int argc; char **argv; int *pargc; char ***pargv; { int i; *pargc = argc; *pargv = (char **) xmalloc (argc * sizeof (char *)); for (i = 0; i < argc; ++i) (*pargv)[i] = xstrdup (argv[i]); }