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|
/*
* tclUnixFile.c --
*
* This file contains wrappers around UNIX file handling functions.
* These wrappers mask differences between Windows and UNIX.
*
* Copyright (c) 1995-1998 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclUnixFile.c,v 1.32.2.1 2003/10/03 17:45:37 vincentdarley Exp $
*/
#include "tclInt.h"
#include "tclPort.h"
static int NativeMatchType(CONST char* nativeName, Tcl_GlobTypeData *types);
/*
*---------------------------------------------------------------------------
*
* TclpFindExecutable --
*
* This procedure computes the absolute path name of the current
* application, given its argv[0] value.
*
* Results:
* A dirty UTF string that is the path to the executable. At this
* point we may not know the system encoding. Convert the native
* string value to UTF using the default encoding. The assumption
* is that we will still be able to parse the path given the path
* name contains ASCII string and '/' chars do not conflict with
* other UTF chars.
*
* Side effects:
* The variable tclNativeExecutableName gets filled in with the file
* name for the application, if we figured it out. If we couldn't
* figure it out, tclNativeExecutableName is set to NULL.
*
*---------------------------------------------------------------------------
*/
char *
TclpFindExecutable(argv0)
CONST char *argv0; /* The value of the application's argv[0]
* (native). */
{
CONST char *name, *p;
Tcl_StatBuf statBuf;
int length;
Tcl_DString buffer, nameString;
if (argv0 == NULL) {
return NULL;
}
if (tclNativeExecutableName != NULL) {
return tclNativeExecutableName;
}
Tcl_DStringInit(&buffer);
name = argv0;
for (p = name; *p != '\0'; p++) {
if (*p == '/') {
/*
* The name contains a slash, so use the name directly
* without doing a path search.
*/
goto gotName;
}
}
p = getenv("PATH"); /* INTL: Native. */
if (p == NULL) {
/*
* There's no PATH environment variable; use the default that
* is used by sh.
*/
p = ":/bin:/usr/bin";
} else if (*p == '\0') {
/*
* An empty path is equivalent to ".".
*/
p = "./";
}
/*
* Search through all the directories named in the PATH variable
* to see if argv[0] is in one of them. If so, use that file
* name.
*/
while (1) {
while (isspace(UCHAR(*p))) { /* INTL: BUG */
p++;
}
name = p;
while ((*p != ':') && (*p != 0)) {
p++;
}
Tcl_DStringSetLength(&buffer, 0);
if (p != name) {
Tcl_DStringAppend(&buffer, name, p - name);
if (p[-1] != '/') {
Tcl_DStringAppend(&buffer, "/", 1);
}
}
name = Tcl_DStringAppend(&buffer, argv0, -1);
/*
* INTL: The following calls to access() and stat() should not be
* converted to Tclp routines because they need to operate on native
* strings directly.
*/
if ((access(name, X_OK) == 0) /* INTL: Native. */
&& (TclOSstat(name, &statBuf) == 0) /* INTL: Native. */
&& S_ISREG(statBuf.st_mode)) {
goto gotName;
}
if (*p == '\0') {
break;
} else if (*(p+1) == 0) {
p = "./";
} else {
p++;
}
}
goto done;
/*
* If the name starts with "/" then just copy it to tclExecutableName.
*/
gotName:
#ifdef DJGPP
if (name[1] == ':') {
#else
if (name[0] == '/') {
#endif
Tcl_ExternalToUtfDString(NULL, name, -1, &nameString);
tclNativeExecutableName = (char *)
ckalloc((unsigned) (Tcl_DStringLength(&nameString) + 1));
strcpy(tclNativeExecutableName, Tcl_DStringValue(&nameString));
Tcl_DStringFree(&nameString);
goto done;
}
/*
* The name is relative to the current working directory. First
* strip off a leading "./", if any, then add the full path name of
* the current working directory.
*/
if ((name[0] == '.') && (name[1] == '/')) {
name += 2;
}
Tcl_ExternalToUtfDString(NULL, name, -1, &nameString);
Tcl_DStringFree(&buffer);
TclpGetCwd(NULL, &buffer);
length = Tcl_DStringLength(&buffer) + Tcl_DStringLength(&nameString) + 2;
tclNativeExecutableName = (char *) ckalloc((unsigned) length);
strcpy(tclNativeExecutableName, Tcl_DStringValue(&buffer));
tclNativeExecutableName[Tcl_DStringLength(&buffer)] = '/';
strcpy(tclNativeExecutableName + Tcl_DStringLength(&buffer) + 1,
Tcl_DStringValue(&nameString));
Tcl_DStringFree(&nameString);
done:
Tcl_DStringFree(&buffer);
return tclNativeExecutableName;
}
/*
*----------------------------------------------------------------------
*
* TclpMatchInDirectory --
*
* This routine is used by the globbing code to search a
* directory for all files which match a given pattern.
*
* Results:
* The return value is a standard Tcl result indicating whether an
* error occurred in globbing. Errors are left in interp, good
* results are lappended to resultPtr (which must be a valid object)
*
* Side effects:
* None.
*
*---------------------------------------------------------------------- */
int
TclpMatchInDirectory(interp, resultPtr, pathPtr, pattern, types)
Tcl_Interp *interp; /* Interpreter to receive errors. */
Tcl_Obj *resultPtr; /* List object to lappend results. */
Tcl_Obj *pathPtr; /* Contains path to directory to search. */
CONST char *pattern; /* Pattern to match against. */
Tcl_GlobTypeData *types; /* Object containing list of acceptable types.
* May be NULL. In particular the directory
* flag is very important. */
{
CONST char *native;
Tcl_Obj *fileNamePtr;
fileNamePtr = Tcl_FSGetTranslatedPath(interp, pathPtr);
if (fileNamePtr == NULL) {
return TCL_ERROR;
}
if (pattern == NULL || (*pattern == '\0')) {
/* Match a file directly */
native = (CONST char*) Tcl_FSGetNativePath(pathPtr);
if (NativeMatchType(native, types)) {
Tcl_ListObjAppendElement(interp, resultPtr, pathPtr);
}
return TCL_OK;
} else {
DIR *d;
Tcl_DirEntry *entryPtr;
CONST char *dirName;
int dirLength;
int matchHidden;
int nativeDirLen;
Tcl_StatBuf statBuf;
Tcl_DString ds; /* native encoding of dir */
Tcl_DString dsOrig; /* utf-8 encoding of dir */
Tcl_DStringInit(&dsOrig);
dirName = Tcl_GetStringFromObj(fileNamePtr, &dirLength);
Tcl_DStringAppend(&dsOrig, dirName, dirLength);
/*
* Make sure that the directory part of the name really is a
* directory. If the directory name is "", use the name "."
* instead, because some UNIX systems don't treat "" like "."
* automatically. Keep the "" for use in generating file names,
* otherwise "glob foo.c" would return "./foo.c".
*/
if (dirLength == 0) {
dirName = ".";
} else {
dirName = Tcl_DStringValue(&dsOrig);
/* Make sure we have a trailing directory delimiter */
if (dirName[dirLength-1] != '/') {
dirName = Tcl_DStringAppend(&dsOrig, "/", 1);
dirLength++;
}
}
Tcl_DecrRefCount(fileNamePtr);
/*
* Now open the directory for reading and iterate over the contents.
*/
native = Tcl_UtfToExternalDString(NULL, dirName, -1, &ds);
if ((TclOSstat(native, &statBuf) != 0) /* INTL: Native. */
|| !S_ISDIR(statBuf.st_mode)) {
Tcl_DStringFree(&dsOrig);
Tcl_DStringFree(&ds);
return TCL_OK;
}
d = opendir(native); /* INTL: Native. */
if (d == NULL) {
Tcl_DStringFree(&ds);
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "couldn't read directory \"",
Tcl_DStringValue(&dsOrig), "\": ",
Tcl_PosixError(interp), (char *) NULL);
Tcl_DStringFree(&dsOrig);
return TCL_ERROR;
}
nativeDirLen = Tcl_DStringLength(&ds);
/*
* Check to see if -type or the pattern requests hidden files.
*/
matchHidden = ((types && (types->perm & TCL_GLOB_PERM_HIDDEN)) ||
((pattern[0] == '.')
|| ((pattern[0] == '\\') && (pattern[1] == '.'))));
while ((entryPtr = TclOSreaddir(d)) != NULL) { /* INTL: Native. */
Tcl_DString utfDs;
CONST char *utfname;
/*
* Skip this file if it doesn't agree with the hidden
* parameters requested by the user (via -type or pattern).
*/
if (*entryPtr->d_name == '.') {
if (!matchHidden) continue;
} else {
if (matchHidden) continue;
}
/*
* Now check to see if the file matches, according to both type
* and pattern. If so, add the file to the result.
*/
utfname = Tcl_ExternalToUtfDString(NULL, entryPtr->d_name,
-1, &utfDs);
if (Tcl_StringCaseMatch(utfname, pattern, 0)) {
int typeOk = 1;
if (types != NULL) {
Tcl_DStringSetLength(&ds, nativeDirLen);
native = Tcl_DStringAppend(&ds, entryPtr->d_name, -1);
typeOk = NativeMatchType(native, types);
}
if (typeOk) {
Tcl_ListObjAppendElement(interp, resultPtr,
TclNewFSPathObj(pathPtr, utfname,
Tcl_DStringLength(&utfDs)));
}
}
Tcl_DStringFree(&utfDs);
}
closedir(d);
Tcl_DStringFree(&ds);
Tcl_DStringFree(&dsOrig);
return TCL_OK;
}
}
static int
NativeMatchType(
CONST char* nativeEntry, /* Native path to check */
Tcl_GlobTypeData *types) /* Type description to match against */
{
Tcl_StatBuf buf;
if (types == NULL) {
/*
* Simply check for the file's existence, but do it
* with lstat, in case it is a link to a file which
* doesn't exist (since that case would not show up
* if we used 'access' or 'stat')
*/
if (TclOSlstat(nativeEntry, &buf) != 0) {
return 0;
}
} else {
if (types->perm != 0) {
if (TclOSstat(nativeEntry, &buf) != 0) {
/*
* Either the file has disappeared between the
* 'readdir' call and the 'stat' call, or
* the file is a link to a file which doesn't
* exist (which we could ascertain with
* lstat), or there is some other strange
* problem. In all these cases, we define this
* to mean the file does not match any defined
* permission, and therefore it is not
* added to the list of files to return.
*/
return 0;
}
/*
* readonly means that there are NO write permissions
* (even for user), but execute is OK for anybody
*/
if (((types->perm & TCL_GLOB_PERM_RONLY) &&
(buf.st_mode & (S_IWOTH|S_IWGRP|S_IWUSR))) ||
((types->perm & TCL_GLOB_PERM_R) &&
(access(nativeEntry, R_OK) != 0)) ||
((types->perm & TCL_GLOB_PERM_W) &&
(access(nativeEntry, W_OK) != 0)) ||
((types->perm & TCL_GLOB_PERM_X) &&
(access(nativeEntry, X_OK) != 0))
) {
return 0;
}
}
if (types->type != 0) {
if (types->perm == 0) {
/* We haven't yet done a stat on the file */
if (TclOSstat(nativeEntry, &buf) != 0) {
/*
* Posix error occurred. The only ok
* case is if this is a link to a nonexistent
* file, and the user did 'glob -l'. So
* we check that here:
*/
if (types->type & TCL_GLOB_TYPE_LINK) {
if (TclOSlstat(nativeEntry, &buf) == 0) {
if (S_ISLNK(buf.st_mode)) {
return 1;
}
}
}
return 0;
}
}
/*
* In order bcdpfls as in 'find -t'
*/
if (
((types->type & TCL_GLOB_TYPE_BLOCK) &&
S_ISBLK(buf.st_mode)) ||
((types->type & TCL_GLOB_TYPE_CHAR) &&
S_ISCHR(buf.st_mode)) ||
((types->type & TCL_GLOB_TYPE_DIR) &&
S_ISDIR(buf.st_mode)) ||
((types->type & TCL_GLOB_TYPE_PIPE) &&
S_ISFIFO(buf.st_mode)) ||
((types->type & TCL_GLOB_TYPE_FILE) &&
S_ISREG(buf.st_mode))
#ifdef S_ISSOCK
|| ((types->type & TCL_GLOB_TYPE_SOCK) &&
S_ISSOCK(buf.st_mode))
#endif /* S_ISSOCK */
) {
/* Do nothing -- this file is ok */
} else {
#ifdef S_ISLNK
if (types->type & TCL_GLOB_TYPE_LINK) {
if (TclOSlstat(nativeEntry, &buf) == 0) {
if (S_ISLNK(buf.st_mode)) {
return 1;
}
}
}
#endif /* S_ISLNK */
return 0;
}
}
}
return 1;
}
/*
*---------------------------------------------------------------------------
*
* TclpGetUserHome --
*
* This function takes the specified user name and finds their
* home directory.
*
* Results:
* The result is a pointer to a string specifying the user's home
* directory, or NULL if the user's home directory could not be
* determined. Storage for the result string is allocated in
* bufferPtr; the caller must call Tcl_DStringFree() when the result
* is no longer needed.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
char *
TclpGetUserHome(name, bufferPtr)
CONST char *name; /* User name for desired home directory. */
Tcl_DString *bufferPtr; /* Uninitialized or free DString filled
* with name of user's home directory. */
{
struct passwd *pwPtr;
Tcl_DString ds;
CONST char *native;
native = Tcl_UtfToExternalDString(NULL, name, -1, &ds);
pwPtr = getpwnam(native); /* INTL: Native. */
Tcl_DStringFree(&ds);
if (pwPtr == NULL) {
endpwent();
return NULL;
}
Tcl_ExternalToUtfDString(NULL, pwPtr->pw_dir, -1, bufferPtr);
endpwent();
return Tcl_DStringValue(bufferPtr);
}
/*
*---------------------------------------------------------------------------
*
* TclpObjAccess --
*
* This function replaces the library version of access().
*
* Results:
* See access() documentation.
*
* Side effects:
* See access() documentation.
*
*---------------------------------------------------------------------------
*/
int
TclpObjAccess(pathPtr, mode)
Tcl_Obj *pathPtr; /* Path of file to access */
int mode; /* Permission setting. */
{
CONST char *path = Tcl_FSGetNativePath(pathPtr);
if (path == NULL) {
return -1;
} else {
return access(path, mode);
}
}
/*
*---------------------------------------------------------------------------
*
* TclpObjChdir --
*
* This function replaces the library version of chdir().
*
* Results:
* See chdir() documentation.
*
* Side effects:
* See chdir() documentation.
*
*---------------------------------------------------------------------------
*/
int
TclpObjChdir(pathPtr)
Tcl_Obj *pathPtr; /* Path to new working directory */
{
CONST char *path = Tcl_FSGetNativePath(pathPtr);
if (path == NULL) {
return -1;
} else {
return chdir(path);
}
}
/*
*----------------------------------------------------------------------
*
* TclpObjLstat --
*
* This function replaces the library version of lstat().
*
* Results:
* See lstat() documentation.
*
* Side effects:
* See lstat() documentation.
*
*----------------------------------------------------------------------
*/
int
TclpObjLstat(pathPtr, bufPtr)
Tcl_Obj *pathPtr; /* Path of file to stat */
Tcl_StatBuf *bufPtr; /* Filled with results of stat call. */
{
return TclOSlstat(Tcl_FSGetNativePath(pathPtr), bufPtr);
}
/*
*---------------------------------------------------------------------------
*
* TclpObjGetCwd --
*
* This function replaces the library version of getcwd().
*
* Results:
* The result is a pointer to a string specifying the current
* directory, or NULL if the current directory could not be
* determined. If NULL is returned, an error message is left in the
* interp's result. Storage for the result string is allocated in
* bufferPtr; the caller must call Tcl_DStringFree() when the result
* is no longer needed.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Obj*
TclpObjGetCwd(interp)
Tcl_Interp *interp;
{
Tcl_DString ds;
if (TclpGetCwd(interp, &ds) != NULL) {
Tcl_Obj *cwdPtr = Tcl_NewStringObj(Tcl_DStringValue(&ds), -1);
Tcl_IncrRefCount(cwdPtr);
Tcl_DStringFree(&ds);
return cwdPtr;
} else {
return NULL;
}
}
/* Older string based version */
CONST char *
TclpGetCwd(interp, bufferPtr)
Tcl_Interp *interp; /* If non-NULL, used for error reporting. */
Tcl_DString *bufferPtr; /* Uninitialized or free DString filled
* with name of current directory. */
{
char buffer[MAXPATHLEN+1];
#ifdef USEGETWD
if (getwd(buffer) == NULL) { /* INTL: Native. */
#else
if (getcwd(buffer, MAXPATHLEN + 1) == NULL) { /* INTL: Native. */
#endif
if (interp != NULL) {
Tcl_AppendResult(interp,
"error getting working directory name: ",
Tcl_PosixError(interp), (char *) NULL);
}
return NULL;
}
return Tcl_ExternalToUtfDString(NULL, buffer, -1, bufferPtr);
}
/*
*---------------------------------------------------------------------------
*
* TclpReadlink --
*
* This function replaces the library version of readlink().
*
* Results:
* The result is a pointer to a string specifying the contents
* of the symbolic link given by 'path', or NULL if the symbolic
* link could not be read. Storage for the result string is
* allocated in bufferPtr; the caller must call Tcl_DStringFree()
* when the result is no longer needed.
*
* Side effects:
* See readlink() documentation.
*
*---------------------------------------------------------------------------
*/
char *
TclpReadlink(path, linkPtr)
CONST char *path; /* Path of file to readlink (UTF-8). */
Tcl_DString *linkPtr; /* Uninitialized or free DString filled
* with contents of link (UTF-8). */
{
#ifndef DJGPP
char link[MAXPATHLEN];
int length;
CONST char *native;
Tcl_DString ds;
native = Tcl_UtfToExternalDString(NULL, path, -1, &ds);
length = readlink(native, link, sizeof(link)); /* INTL: Native. */
Tcl_DStringFree(&ds);
if (length < 0) {
return NULL;
}
Tcl_ExternalToUtfDString(NULL, link, length, linkPtr);
return Tcl_DStringValue(linkPtr);
#else
return NULL;
#endif
}
/*
*----------------------------------------------------------------------
*
* TclpObjStat --
*
* This function replaces the library version of stat().
*
* Results:
* See stat() documentation.
*
* Side effects:
* See stat() documentation.
*
*----------------------------------------------------------------------
*/
int
TclpObjStat(pathPtr, bufPtr)
Tcl_Obj *pathPtr; /* Path of file to stat */
Tcl_StatBuf *bufPtr; /* Filled with results of stat call. */
{
CONST char *path = Tcl_FSGetNativePath(pathPtr);
if (path == NULL) {
return -1;
} else {
return TclOSstat(path, bufPtr);
}
}
#ifdef S_IFLNK
Tcl_Obj*
TclpObjLink(pathPtr, toPtr, linkAction)
Tcl_Obj *pathPtr;
Tcl_Obj *toPtr;
int linkAction;
{
if (toPtr != NULL) {
CONST char *src = Tcl_FSGetNativePath(pathPtr);
CONST char *target = Tcl_FSGetNativePath(toPtr);
if (src == NULL || target == NULL) {
return NULL;
}
if (access(src, F_OK) != -1) {
/* src exists */
errno = EEXIST;
return NULL;
}
if (access(target, F_OK) == -1) {
/* target doesn't exist */
errno = ENOENT;
return NULL;
}
/*
* Check symbolic link flag first, since we prefer to
* create these.
*/
if (linkAction & TCL_CREATE_SYMBOLIC_LINK) {
if (symlink(target, src) != 0) return NULL;
} else if (linkAction & TCL_CREATE_HARD_LINK) {
if (link(target, src) != 0) return NULL;
} else {
errno = ENODEV;
return NULL;
}
return toPtr;
} else {
Tcl_Obj* linkPtr = NULL;
char link[MAXPATHLEN];
int length;
Tcl_DString ds;
Tcl_Obj *transPtr;
transPtr = Tcl_FSGetTranslatedPath(NULL, pathPtr);
if (transPtr == NULL) {
return NULL;
}
Tcl_DecrRefCount(transPtr);
length = readlink(Tcl_FSGetNativePath(pathPtr), link, sizeof(link));
if (length < 0) {
return NULL;
}
Tcl_ExternalToUtfDString(NULL, link, length, &ds);
linkPtr = Tcl_NewStringObj(Tcl_DStringValue(&ds),
Tcl_DStringLength(&ds));
Tcl_DStringFree(&ds);
if (linkPtr != NULL) {
Tcl_IncrRefCount(linkPtr);
}
return linkPtr;
}
}
#endif
/*
*---------------------------------------------------------------------------
*
* TclpFilesystemPathType --
*
* This function is part of the native filesystem support, and
* returns the path type of the given path. Right now it simply
* returns NULL. In the future it could return specific path
* types, like 'nfs', 'samba', 'FAT32', etc.
*
* Results:
* NULL at present.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
Tcl_Obj*
TclpFilesystemPathType(pathObjPtr)
Tcl_Obj* pathObjPtr;
{
/* All native paths are of the same type */
return NULL;
}
/*
*---------------------------------------------------------------------------
*
* TclpUtime --
*
* Set the modification date for a file.
*
* Results:
* 0 on success, -1 on error.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
int
TclpUtime(pathPtr, tval)
Tcl_Obj *pathPtr; /* File to modify */
struct utimbuf *tval; /* New modification date structure */
{
return utime(Tcl_FSGetNativePath(pathPtr),tval);
}
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