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archie/tcl7.6/unix/tclUnixFCmd.c

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Update tcl/tk for tcl-dp
2024-05-27 16:40:40 +02:00
/*
* tclUnixFCmd.c
*
* This file implements the unix specific portion of file manipulation
* subcommands of the "file" command. All filename arguments should
* already be translated to native format.
*
* Copyright (c) 1996 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tclUnixFCmd.c 1.15 96/10/10 10:16:39
*
* Portions of this code were derived from NetBSD source code which has
* the following copyright notice:
*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "tclInt.h"
#include "tclPort.h"
#include <utime.h>
/*
* The following constants specify the type of callback when
* TraverseUnixTree() calls the traverseProc()
*/
#define DOTREE_PRED 1 /* pre-order directory */
#define DOTREE_POSTD 2 /* post-order directory */
#define DOTREE_F 3 /* regular file */
/*
* Prototype for the TraverseUnixTree callback function.
*/
typedef int (TraversalProc) _ANSI_ARGS_((char *src, char *dst,
struct stat *sb, int type, Tcl_DString *errorPtr));
/*
* Declarations for local procedures defined in this file:
*/
static int CopyFile _ANSI_ARGS_((char *src, char *dst,
struct stat *srcStatBufPtr));
static int CopyFileAtts _ANSI_ARGS_((char *src, char *dst,
struct stat *srcStatBufPtr));
static int TraversalCopy _ANSI_ARGS_((char *src, char *dst,
struct stat *sbPtr, int type,
Tcl_DString *errorPtr));
static int TraversalDelete _ANSI_ARGS_((char *src, char *dst,
struct stat *sbPtr, int type,
Tcl_DString *errorPtr));
static int TraverseUnixTree _ANSI_ARGS_((
TraversalProc *traversalProc,
Tcl_DString *sourcePath, Tcl_DString *destPath,
Tcl_DString *errorPtr));
/*
*---------------------------------------------------------------------------
*
* TclpRenameFile --
*
* Changes the name of an existing file or directory, from src to dst.
* If src and dst refer to the same file or directory, does nothing
* and returns success. Otherwise if dst already exists, it will be
* deleted and replaced by src subject to the following conditions:
* If src is a directory, dst may be an empty directory.
* If src is a file, dst may be a file.
* In any other situation where dst already exists, the rename will
* fail.
*
* Results:
* If the directory was successfully created, returns TCL_OK.
* Otherwise the return value is TCL_ERROR and errno is set to
* indicate the error. Some possible values for errno are:
*
* EACCES: src or dst parent directory can't be read and/or written.
* EEXIST: dst is a non-empty directory.
* EINVAL: src is a root directory or dst is a subdirectory of src.
* EISDIR: dst is a directory, but src is not.
* ENOENT: src doesn't exist, or src or dst is "".
* ENOTDIR: src is a directory, but dst is not.
* EXDEV: src and dst are on different filesystems.
*
* Side effects:
* The implementation of rename may allow cross-filesystem renames,
* but the caller should be prepared to emulate it with copy and
* delete if errno is EXDEV.
*
*---------------------------------------------------------------------------
*/
int
TclpRenameFile(src, dst)
char *src; /* Pathname of file or dir to be renamed. */
char *dst; /* New pathname of file or directory. */
{
if (rename(src, dst) == 0) {
return TCL_OK;
}
if (errno == ENOTEMPTY) {
errno = EEXIST;
}
#ifdef sparc
/*
* SunOS 4.1.4 reports overwriting a non-empty directory with a
* directory as EINVAL instead of EEXIST (first rule out the correct
* EINVAL result code for moving a directory into itself). Must be
* conditionally compiled because realpath() is only defined on SunOS.
*/
if (errno == EINVAL) {
char srcPath[MAXPATHLEN], dstPath[MAXPATHLEN];
DIR *dirPtr;
struct dirent *dirEntPtr;
if ((realpath(src, srcPath) != NULL)
&& (realpath(dst, dstPath) != NULL)
&& (strncmp(srcPath, dstPath, strlen(srcPath)) != 0)) {
dirPtr = opendir(dst);
if (dirPtr != NULL) {
while ((dirEntPtr = readdir(dirPtr)) != NULL) {
if ((strcmp(dirEntPtr->d_name, ".") != 0) &&
(strcmp(dirEntPtr->d_name, "..") != 0)) {
errno = EEXIST;
closedir(dirPtr);
return TCL_ERROR;
}
}
closedir(dirPtr);
}
}
errno = EINVAL;
}
#endif /* sparc */
if (strcmp(src, "/") == 0) {
/*
* Alpha reports renaming / as EBUSY and Linux reports it as EACCES,
* instead of EINVAL.
*/
errno = EINVAL;
}
/*
* DEC Alpha OSF1 V3.0 returns EACCES when attempting to move a
* file across filesystems and the parent directory of that file is
* not writable. Most other systems return EXDEV. Does nothing to
* correct this behavior.
*/
return TCL_ERROR;
}
/*
*---------------------------------------------------------------------------
*
* TclpCopyFile --
*
* Copy a single file (not a directory). If dst already exists and
* is not a directory, it is removed.
*
* Results:
* If the file was successfully copied, returns TCL_OK. Otherwise
* the return value is TCL_ERROR and errno is set to indicate the
* error. Some possible values for errno are:
*
* EACCES: src or dst parent directory can't be read and/or written.
* EISDIR: src or dst is a directory.
* ENOENT: src doesn't exist. src or dst is "".
*
* Side effects:
* This procedure will also copy symbolic links, block, and
* character devices, and fifos. For symbolic links, the links
* themselves will be copied and not what they point to. For the
* other special file types, the directory entry will be copied and
* not the contents of the device that it refers to.
*
*---------------------------------------------------------------------------
*/
int
TclpCopyFile(src, dst)
char *src; /* Pathname of file to be copied. */
char *dst; /* Pathname of file to copy to. */
{
struct stat srcStatBuf, dstStatBuf;
char link[MAXPATHLEN];
int length;
/*
* Have to do a stat() to determine the filetype.
*/
if (lstat(src, &srcStatBuf) != 0) {
return TCL_ERROR;
}
if (S_ISDIR(srcStatBuf.st_mode)) {
errno = EISDIR;
return TCL_ERROR;
}
/*
* symlink, and some of the other calls will fail if the target
* exists, so we remove it first
*/
if (lstat(dst, &dstStatBuf) == 0) {
if (S_ISDIR(dstStatBuf.st_mode)) {
errno = EISDIR;
return TCL_ERROR;
}
}
if (unlink(dst) != 0) {
if (errno != ENOENT) {
return TCL_ERROR;
}
}
switch ((int) (srcStatBuf.st_mode & S_IFMT)) {
case S_IFLNK:
length = readlink(src, link, sizeof(link));
if (length == -1) {
return TCL_ERROR;
}
link[length] = '\0';
if (symlink(link, dst) < 0) {
return TCL_ERROR;
}
return TCL_OK;
case S_IFBLK:
case S_IFCHR:
if (mknod(dst, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) {
return TCL_ERROR;
}
return CopyFileAtts(src, dst, &srcStatBuf);
case S_IFIFO:
if (mkfifo(dst, srcStatBuf.st_mode) < 0) {
return TCL_ERROR;
}
return CopyFileAtts(src, dst, &srcStatBuf);
default:
return CopyFile(src, dst, &srcStatBuf);
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* CopyFile -
*
* Helper function for TclpCopyFile. Copies one regular file,
* using read() and write().
*
* Results:
* A standard Tcl result.
*
* Side effects:
* A file is copied. Dst will be overwritten if it exists.
*
*----------------------------------------------------------------------
*/
static int
CopyFile(src, dst, srcStatBufPtr)
char *src; /* Pathname of file to copy. */
char *dst; /* Pathname of file to create/overwrite. */
struct stat *srcStatBufPtr; /* Used to determine mode and blocksize */
{
int srcFd;
int dstFd;
u_int blockSize; /* Optimal I/O blocksize for filesystem */
char *buffer; /* Data buffer for copy */
size_t nread;
if ((srcFd = open(src, O_RDONLY, 0)) < 0) {
return TCL_ERROR;
}
dstFd = open(dst, O_CREAT | O_TRUNC | O_WRONLY, srcStatBufPtr->st_mode);
if (dstFd < 0) {
close(srcFd);
return TCL_ERROR;
}
blockSize = srcStatBufPtr->st_blksize;
buffer = ckalloc(blockSize);
while (1) {
nread = read(srcFd, buffer, blockSize);
if ((nread == -1) || (nread == 0)) {
break;
}
if (write(dstFd, buffer, nread) != nread) {
nread = (size_t) -1;
break;
}
}
ckfree(buffer);
close(srcFd);
if ((close(dstFd) != 0) || (nread == -1)) {
unlink(dst);
return TCL_ERROR;
}
if (CopyFileAtts(src, dst, srcStatBufPtr) == TCL_ERROR) {
/*
* The copy succeeded, but setting the permissions failed, so be in
* a consistent state, we remove the file that was created by the
* copy.
*/
unlink(dst);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* TclpDeleteFile --
*
* Removes a single file (not a directory).
*
* Results:
* If the file was successfully deleted, returns TCL_OK. Otherwise
* the return value is TCL_ERROR and errno is set to indicate the
* error. Some possible values for errno are:
*
* EACCES: a parent directory can't be read and/or written.
* EISDIR: path is a directory.
* ENOENT: path doesn't exist or is "".
*
* Side effects:
* The file is deleted, even if it is read-only.
*
*---------------------------------------------------------------------------
*/
int
TclpDeleteFile(path)
char *path; /* Pathname of file to be removed. */
{
if (unlink(path) != 0) {
return TCL_ERROR;
}
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* TclpCreateDirectory --
*
* Creates the specified directory. All parent directories of the
* specified directory must already exist. The directory is
* automatically created with permissions so that user can access
* the new directory and create new files or subdirectories in it.
*
* Results:
* If the directory was successfully created, returns TCL_OK.
* Otherwise the return value is TCL_ERROR and errno is set to
* indicate the error. Some possible values for errno are:
*
* EACCES: a parent directory can't be read and/or written.
* EEXIST: path already exists.
* ENOENT: a parent directory doesn't exist.
*
* Side effects:
* A directory is created with the current umask, except that
* permission for u+rwx will always be added.
*
*---------------------------------------------------------------------------
*/
int
TclpCreateDirectory(path)
char *path; /* Pathname of directory to create. */
{
mode_t mode;
mode = umask(0);
umask(mode);
/*
* umask return value is actually the inverse of the permissions.
*/
mode = (0777 & ~mode);
if (mkdir(path, mode | S_IRUSR | S_IWUSR | S_IXUSR) != 0) {
return TCL_ERROR;
}
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* TclpCopyDirectory --
*
* Recursively copies a directory. The target directory dst must
* not already exist. Note that this function does not merge two
* directory hierarchies, even if the target directory is an an
* empty directory.
*
* Results:
* If the directory was successfully copied, returns TCL_OK.
* Otherwise the return value is TCL_ERROR, errno is set to indicate
* the error, and the pathname of the file that caused the error
* is stored in errorPtr. See TclpCreateDirectory and TclpCopyFile
* for a description of possible values for errno.
*
* Side effects:
* An exact copy of the directory hierarchy src will be created
* with the name dst. If an error occurs, the error will
* be returned immediately, and remaining files will not be
* processed.
*
*---------------------------------------------------------------------------
*/
int
TclpCopyDirectory(src, dst, errorPtr)
char *src; /* Pathname of directory to be copied. */
char *dst; /* Pathname of target directory. */
Tcl_DString *errorPtr; /* If non-NULL, initialized DString for
* error reporting. */
{
int result;
Tcl_DString srcBuffer;
Tcl_DString dstBuffer;
Tcl_DStringInit(&srcBuffer);
Tcl_DStringInit(&dstBuffer);
Tcl_DStringAppend(&srcBuffer, src, -1);
Tcl_DStringAppend(&dstBuffer, dst, -1);
result = TraverseUnixTree(TraversalCopy, &srcBuffer, &dstBuffer,
errorPtr);
Tcl_DStringFree(&srcBuffer);
Tcl_DStringFree(&dstBuffer);
return result;
}
/*
*---------------------------------------------------------------------------
*
* TclpRemoveDirectory --
*
* Removes directory (and its contents, if the recursive flag is set).
*
* Results:
* If the directory was successfully removed, returns TCL_OK.
* Otherwise the return value is TCL_ERROR, errno is set to indicate
* the error, and the pathname of the file that caused the error
* is stored in errorPtr. Some possible values for errno are:
*
* EACCES: path directory can't be read and/or written.
* EEXIST: path is a non-empty directory.
* EINVAL: path is a root directory.
* ENOENT: path doesn't exist or is "".
* ENOTDIR: path is not a directory.
*
* Side effects:
* Directory removed. If an error occurs, the error will be returned
* immediately, and remaining files will not be deleted.
*
*---------------------------------------------------------------------------
*/
int
TclpRemoveDirectory(path, recursive, errorPtr)
char *path; /* Pathname of directory to be removed. */
int recursive; /* If non-zero, removes directories that
* are nonempty. Otherwise, will only remove
* empty directories. */
Tcl_DString *errorPtr; /* If non-NULL, initialized DString for
* error reporting. */
{
int result;
Tcl_DString buffer;
if (rmdir(path) == 0) {
return TCL_OK;
}
if (((errno != EEXIST) && (errno != ENOTEMPTY)) || (recursive == 0)) {
if (errorPtr != NULL) {
Tcl_DStringAppend(errorPtr, path, -1);
}
return TCL_ERROR;
}
/*
* The directory is nonempty, but the recursive flag has been
* specified, so we recursively remove all the files in the directory.
*/
Tcl_DStringInit(&buffer);
Tcl_DStringAppend(&buffer, path, -1);
result = TraverseUnixTree(TraversalDelete, &buffer, NULL, errorPtr);
Tcl_DStringFree(&buffer);
return result;
}
/*
*---------------------------------------------------------------------------
*
* TraverseUnixTree --
*
* Traverse directory tree specified by sourcePtr, calling the function
* traverseProc for each file and directory encountered. If destPtr
* is non-null, each of name in the sourcePtr directory is appended to
* the directory specified by destPtr and passed as the second argument
* to traverseProc() .
*
* Results:
* Standard Tcl result.
*
* Side effects:
* None caused by TraverseUnixTree, however the user specified
* traverseProc() may change state. If an error occurs, the error will
* be returned immediately, and remaining files will not be processed.
*
*---------------------------------------------------------------------------
*/
static int
TraverseUnixTree(traverseProc, sourcePtr, targetPtr, errorPtr)
TraversalProc *traverseProc;/* Function to call for every file and
* directory in source hierarchy. */
Tcl_DString *sourcePtr; /* Pathname of source directory to be
* traversed. */
Tcl_DString *targetPtr; /* Pathname of directory to traverse in
* parallel with source directory. */
Tcl_DString *errorPtr; /* If non-NULL, an initialized DString for
* error reporting. */
{
struct stat statbuf;
char *source, *target, *errfile;
int result, sourceLen;
int targetLen = 0; /* Initialization needed only to prevent
* warning in gcc. */
struct dirent *dirp;
DIR *dp;
result = TCL_OK;
source = Tcl_DStringValue(sourcePtr);
if (targetPtr != NULL) {
target = Tcl_DStringValue(targetPtr);
} else {
target = NULL;
}
errfile = NULL;
if (lstat(source, &statbuf) != 0) {
errfile = source;
goto end;
}
if (!S_ISDIR(statbuf.st_mode)) {
/*
* Process the regular file
*/
return (*traverseProc)(source, target, &statbuf, DOTREE_F, errorPtr);
}
dp = opendir(source);
if (dp == NULL) {
/*
* Can't read directory
*/
errfile = source;
goto end;
}
result = (*traverseProc)(source, target, &statbuf, DOTREE_PRED, errorPtr);
if (result != TCL_OK) {
closedir(dp);
return result;
}
Tcl_DStringAppend(sourcePtr, "/", 1);
source = Tcl_DStringValue(sourcePtr);
sourceLen = Tcl_DStringLength(sourcePtr);
if (targetPtr != NULL) {
Tcl_DStringAppend(targetPtr, "/", 1);
target = Tcl_DStringValue(targetPtr);
targetLen = Tcl_DStringLength(targetPtr);
}
while ((dirp = readdir(dp)) != NULL) {
if ((strcmp(dirp->d_name, ".") == 0)
|| (strcmp(dirp->d_name, "..") == 0)) {
continue;
}
/*
* Append name after slash, and recurse on the file.
*/
Tcl_DStringAppend(sourcePtr, dirp->d_name, -1);
if (targetPtr != NULL) {
Tcl_DStringAppend(targetPtr, dirp->d_name, -1);
}
result = TraverseUnixTree(traverseProc, sourcePtr, targetPtr,
errorPtr);
if (result != TCL_OK) {
break;
}
/*
* Remove name after slash.
*/
Tcl_DStringSetLength(sourcePtr, sourceLen);
if (targetPtr != NULL) {
Tcl_DStringSetLength(targetPtr, targetLen);
}
}
closedir(dp);
/*
* Strip off the trailing slash we added
*/
Tcl_DStringSetLength(sourcePtr, sourceLen - 1);
if (targetPtr != NULL) {
Tcl_DStringSetLength(targetPtr, targetLen - 1);
}
if (result == TCL_OK) {
/*
* Call traverseProc() on a directory after visiting all the
* files in that directory.
*/
result = (*traverseProc)(source, target, &statbuf, DOTREE_POSTD,
errorPtr);
}
end:
if (errfile != NULL) {
if (errorPtr != NULL) {
Tcl_DStringAppend(errorPtr, errfile, -1);
}
result = TCL_ERROR;
}
return result;
}
/*
*----------------------------------------------------------------------
*
* TraversalCopy
*
* Called from TraverseUnixTree in order to execute a recursive copy of a
* directory.
*
* Results:
* Standard Tcl result.
*
* Side effects:
* The file or directory src may be copied to dst, depending on
* the value of type.
*
*----------------------------------------------------------------------
*/
static int
TraversalCopy(src, dst, sbPtr, type, errorPtr)
char *src; /* Source pathname to copy. */
char *dst; /* Destination pathname of copy. */
struct stat *sbPtr; /* Stat info for file specified by src. */
int type; /* Reason for call - see TraverseUnixTree(). */
Tcl_DString *errorPtr; /* If non-NULL, initialized DString for
* error return. */
{
switch (type) {
case DOTREE_F:
if (TclpCopyFile(src, dst) == TCL_OK) {
return TCL_OK;
}
break;
case DOTREE_PRED:
if (TclpCreateDirectory(dst) == TCL_OK) {
return TCL_OK;
}
break;
case DOTREE_POSTD:
if (CopyFileAtts(src, dst, sbPtr) == TCL_OK) {
return TCL_OK;
}
break;
}
/*
* There shouldn't be a problem with src, because we already
* checked it to get here.
*/
if (errorPtr != NULL) {
Tcl_DStringAppend(errorPtr, dst, -1);
}
return TCL_ERROR;
}
/*
*---------------------------------------------------------------------------
*
* TraversalDelete --
*
* Called by procedure TraverseUnixTree for every file and directory
* that it encounters in a directory hierarchy. This procedure unlinks
* files, and removes directories after all the containing files
* have been processed.
*
* Results:
* Standard Tcl result.
*
* Side effects:
* Files or directory specified by src will be deleted.
*
*----------------------------------------------------------------------
*/
static int
TraversalDelete(src, ignore, sbPtr, type, errorPtr)
char *src; /* Source pathname. */
char *ignore; /* Destination pathname (not used). */
struct stat *sbPtr; /* Stat info for file specified by src. */
int type; /* Reason for call - see TraverseUnixTree(). */
Tcl_DString *errorPtr; /* If non-NULL, initialized DString for
* error return. */
{
switch (type) {
case DOTREE_F:
if (unlink(src) == 0) {
return TCL_OK;
}
break;
case DOTREE_PRED:
return TCL_OK;
case DOTREE_POSTD:
if (rmdir(src) == 0) {
return TCL_OK;
}
break;
}
if (errorPtr != NULL) {
Tcl_DStringAppend(errorPtr, src, -1);
}
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* CopyFileAtts
*
* Copy the file attributes such as owner, group, permissions, and
* modification date from one file to another.
*
* Results:
* Standard Tcl result.
*
* Side effects:
* user id, group id, permission bits, last modification time, and
* last access time are updated in the new file to reflect the old
* file.
*
*----------------------------------------------------------------------
*/
static int
CopyFileAtts(src, dst, statBufPtr)
char *src; /* Path name of source file */
char *dst; /* Path name of target file */
struct stat *statBufPtr; /* ptr to stat info for source file */
{
struct utimbuf tval;
mode_t newMode;
newMode = statBufPtr->st_mode & (S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO);
/*
* On some systems chown will always fail for a non-root user unless
* POSIX_CHOWN_RESTRICTED is not set. Others will succeed as long as
* you don't try to chown a file to someone besides youself.
*/
if (chown(dst, statBufPtr->st_uid, statBufPtr->st_gid)) {
if (errno != EPERM) {
return TCL_ERROR;
}
}
/*
* Note that if you copy a setuid file that is owned by someone
* else, and you are not root, then the copy will be setuid to you.
* The most correct implementation would probably be to have the
* copy not setuid to anyone if the original file was owned by
* someone else, but this corner case isn't currently handled.
* It would require another lstat(), or getuid().
*/
if (chmod(dst, newMode)) {
newMode &= ~(S_ISUID | S_ISGID);
if (chmod(dst, newMode)) {
return TCL_ERROR;
}
}
tval.actime = statBufPtr->st_atime;
tval.modtime = statBufPtr->st_mtime;
if (utime(dst, &tval)) {
return TCL_ERROR;
}
return TCL_OK;
}
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