/* 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. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ /* 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 "cvs.h" #ifndef lint static const char rcsid[] = "$CVSid:$"; USE(rcsid) #endif /* * I don't know of a convenient way to test this at configure time, or else * I'd certainly do it there. */ #if defined(NeXT) #define LOSING_TMPNAM_FUNCTION #endif static int deep_remove_dir PROTO((const char *path)); /* * Copies "from" to "to". */ 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 = 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; { struct stat sb; if (stat (file, &sb) < 0) return (0); return (1); } /* * Returns non-zero if the argument file is readable. * XXX - must be careful if "cvs" is ever made setuid! */ int isreadable (file) const char *file; { return (access (file, R_OK) != -1); } /* * Returns non-zero if the argument file is writable * XXX - muct be careful if "cvs" is ever made setuid! */ int iswritable (file) const char *file; { return (access (file, W_OK) != -1); } /* * 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 buf; if (stat (name, &buf) == 0 && (!S_ISDIR (buf.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); } /* * 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 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 (rename (from, to) < 0) error (1, errno, "cannot rename file %s to %s", from, to); } /* Windows NT doesn't have hard links or symbolic links. There was only one place in CVS which used this function, so I rewrote it to work another way, so this function isn't used any more. */ #if 0 /* * link a file, if possible. */ int link_file (from, to) const char *from; const char *to; { 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)); } #endif /* * 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. */ if (errno == EISDIR || errno == EACCES) 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 ) { 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 ) { if (errno == EISDIR || errno == EACCES) { 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); } /* The equivalence class mapping for filenames. Windows NT filenames are case-insensitive, but case-preserving. Both / and \ are path element separators. Thus, this table maps both upper and lower case to lower case, and both / and \ to /. */ #if 0 main () { int c; for (c = 0; c < 256; c++) { int t; if (c == '\\') t = '/'; else t = tolower (c); if ((c & 0x7) == 0x0) printf (" "); printf ("0x%02x,", t); if ((c & 0x7) == 0x7) putchar ('\n'); else if ((c & 0x7) == 0x3) putchar (' '); } } #endif unsigned char WNT_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, 0x2f,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 Windows NT, filenames are case-insensitive but case-preserving, and both \ and / are path element separators. */ int fncmp (const char *n1, const char *n2) { while (*n1 && *n2 && (WNT_filename_classes[(unsigned char) *n1] == WNT_filename_classes[(unsigned char) *n2])) n1++, n2++; return (WNT_filename_classes[(unsigned char) *n1] - WNT_filename_classes[(unsigned char) *n1]); } /* Fold characters in FILENAME to their canonical forms. If FOLD_FN_CHAR is not #defined, the system provides a default definition for this. */ void fnfold (char *filename) { while (*filename) { *filename = FOLD_FN_CHAR (*filename); filename++; } } /* Return non-zero iff FILENAME is absolute. Trivial under Unix, but more complicated under other systems. */ int isabsolute (filename) const char *filename; { 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) return last + 1; else return path; } /* Read data from INFILE, and copy it to OUTFILE. Open INFILE using INFLAGS, and OUTFILE using OUTFLAGS. This is useful for converting between CRLF and LF line formats. */ void convert_file (char *infile, int inflags, char *outfile, int outflags) { int infd, outfd; char buf[8192]; int len; if ((infd = open (infile, inflags)) < 0) error (1, errno, "couldn't read %s", infile); if ((outfd = open (outfile, outflags)) < 0) error (1, errno, "couldn't write %s", outfile); while ((len = read (infd, buf, sizeof (buf))) > 0) if (write (outfd, buf, len) < 0) error (1, errno, "error writing %s", outfile); if (len < 0) error (1, errno, "error reading %s", infile); if (close (outfd) < 0) error (0, errno, "warning: couldn't close %s", outfile); if (close (infd) < 0) error (0, errno, "warning: couldn't close %s", infile); }