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tclUnixFile.c
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1330 lines (1178 loc) · 32.5 KB
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/*
* tclUnixFile.c --
*
* This file contains wrappers around UNIX file handling functions.
* These wrappers mask differences between Windows and UNIX.
*
* Copyright © 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.
*/
#include "tclInt.h"
#include "tclFileSystem.h"
#if !defined(NO_DLFCN_H)
#include <dlfcn.h>
#endif
static int NativeMatchType(Tcl_Interp *interp,
const char* nativeEntry, const char* nativeName,
Tcl_GlobTypeData *types);
/*
*---------------------------------------------------------------------------
*
* TclpFindExecutable --
*
* This function computes the absolute path name of the current
* application, given its argv[0] value. For Cygwin, argv[0] is
* ignored and the path is determined the same as under win32.
*
* In the case of shared Tcl library, the absolute path name of the
* Tcl library is also determined.
*
* Results:
* None.
*
* Side effects:
* The computed path name(s) are stored as ProcessGlobalValue entries.
*
*---------------------------------------------------------------------------
*/
#ifdef __CYGWIN__
void
TclpFindExecutable(
TCL_UNUSED(const char *) /*argv0*/)
{
size_t length;
WCHAR buf[PATH_MAX] = L"";
char name[PATH_MAX * TCL_UTF_MAX + 1];
GetModuleFileNameW(NULL, buf, PATH_MAX);
cygwin_conv_path(3, buf, name, sizeof(name));
length = strlen(name);
if ((length > 4) && !strcasecmp(name + length - 4, ".exe")) {
/* Strip '.exe' part. */
length -= 4;
}
TclSetObjNameOfExecutable(Tcl_NewStringObj(name, length), NULL);
#if !defined(STATIC_BUILD)
HMODULE hModule = (HMODULE)TclWinGetTclInstance();
if (GetModuleFileNameW(hModule, buf, PATH_MAX) < PATH_MAX) {
cygwin_conv_path(3, buf, name, sizeof(name));
}
TclSetObjNameOfShlib(Tcl_NewStringObj(name, TCL_AUTO_LENGTH), NULL);
#endif
}
#else
void
TclpFindExecutable(
const char *argv0) /* The value of the application's argv[0]
* (native). */
{
const char *name, *p;
Tcl_StatBuf statBuf;
Tcl_DString buffer, nameString, cwd, utfName;
Tcl_Obj *obj;
if (argv0 == NULL) {
return;
}
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 (TclIsSpaceProcM(*p)) {
p++;
}
name = p;
while ((*p != ':') && (*p != 0)) {
p++;
}
TclDStringClear(&buffer);
if (p != name) {
Tcl_DStringAppend(&buffer, name, p - name);
if (p[-1] != '/') {
TclDStringAppendLiteral(&buffer, "/");
}
}
name = Tcl_DStringAppend(&buffer, argv0, TCL_INDEX_NONE);
/*
* 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] == '\0') {
break;
} else if (p[1] == 0) {
p = "./";
} else {
p++;
}
}
TclNewObj(obj);
TclSetObjNameOfExecutable(obj, NULL);
goto getShlibName;
/*
* If the name starts with "/" then just store it
*/
gotName:
#ifdef DJGPP
if (name[1] == ':')
#else
if (name[0] == '/')
#endif
{
Tcl_ExternalToUtfDStringEx(NULL, NULL, name, TCL_INDEX_NONE, TCL_ENCODING_PROFILE_TCL8, &utfName, NULL);
TclSetObjNameOfExecutable(Tcl_DStringToObj(&utfName), NULL);
goto getShlibName;
}
if (TclpGetCwd(NULL, &cwd) == NULL) {
TclNewObj(obj);
TclSetObjNameOfExecutable(obj, NULL);
goto getShlibName;
}
/*
* 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_DStringInit(&nameString);
Tcl_DStringAppend(&nameString, name, TCL_INDEX_NONE);
Tcl_DStringFree(&buffer);
Tcl_UtfToExternalDStringEx(NULL, NULL, Tcl_DStringValue(&cwd),
Tcl_DStringLength(&cwd), TCL_ENCODING_PROFILE_TCL8, &buffer, NULL);
if (Tcl_DStringValue(&cwd)[Tcl_DStringLength(&cwd) -1] != '/') {
TclDStringAppendLiteral(&buffer, "/");
}
Tcl_DStringFree(&cwd);
TclDStringAppendDString(&buffer, &nameString);
Tcl_DStringFree(&nameString);
Tcl_ExternalToUtfDStringEx(NULL, NULL, Tcl_DStringValue(&buffer), TCL_INDEX_NONE,
TCL_ENCODING_PROFILE_TCL8, &utfName, NULL);
TclSetObjNameOfExecutable(Tcl_DStringToObj(&utfName), NULL);
getShlibName:
#if !defined(STATIC_BUILD)
name = CFG_RUNTIME_LIBDIR "/" CFG_RUNTIME_DLLFILE;
# if !defined(NO_DLFCN_H)
Dl_info dlinfo;
if (dladdr((const void *)TclpFindExecutable, &dlinfo) && dlinfo.dli_fname) {
name = dlinfo.dli_fname;
}
# endif
TclSetObjNameOfShlib(Tcl_NewStringObj(name, TCL_AUTO_LENGTH), NULL);
#endif /* STATIC_BUILD */
Tcl_DStringFree(&buffer);
}
#endif
/*
*----------------------------------------------------------------------
*
* 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
* [lappend]ed to resultPtr (which must be a valid object).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclpMatchInDirectory(
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;
int matchResult = 0;
if (types != NULL && types->type == TCL_GLOB_TYPE_MOUNT) {
/*
* The native filesystem never adds mounts.
*/
return TCL_OK;
}
fileNamePtr = Tcl_FSGetTranslatedPath(interp, pathPtr);
if (fileNamePtr == NULL) {
return TCL_ERROR;
}
if (pattern == NULL || (*pattern == '\0')) {
/*
* Match a file directly.
*/
Tcl_Obj *tailPtr;
const char *nativeTail;
native = (const char *)Tcl_FSGetNativePath(pathPtr);
tailPtr = TclPathPart(interp, pathPtr, TCL_PATH_TAIL);
nativeTail = (const char *)Tcl_FSGetNativePath(tailPtr);
matchResult = NativeMatchType(interp, native, nativeTail, types);
if (matchResult == 1) {
Tcl_ListObjAppendElement(interp, resultPtr, pathPtr);
}
Tcl_DecrRefCount(tailPtr);
Tcl_DecrRefCount(fileNamePtr);
} else {
TclDIR *d;
Tcl_DirEntry *entryPtr;
const char *dirName;
Tcl_Size dirLength, nativeDirLen;
int matchHidden, matchHiddenPat;
Tcl_StatBuf statBuf;
Tcl_DString ds; /* native encoding of dir */
Tcl_DString dsOrig; /* utf-8 encoding of dir */
Tcl_DStringInit(&dsOrig);
dirName = TclGetStringFromObj(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 = TclDStringAppendLiteral(&dsOrig, "/");
dirLength++;
}
}
/*
* Now open the directory for reading and iterate over the contents.
*/
if (Tcl_UtfToExternalDStringEx(interp, NULL, dirName, TCL_INDEX_NONE, 0, &ds, NULL) != TCL_OK) {
Tcl_DStringFree(&dsOrig);
Tcl_DStringFree(&ds);
Tcl_DecrRefCount(fileNamePtr);
return TCL_ERROR;
}
native = Tcl_DStringValue(&ds);
if ((TclOSstat(native, &statBuf) != 0) /* INTL: Native. */
|| !S_ISDIR(statBuf.st_mode)) {
Tcl_DStringFree(&dsOrig);
Tcl_DStringFree(&ds);
Tcl_DecrRefCount(fileNamePtr);
return TCL_OK;
}
d = TclOSopendir(native); /* INTL: Native. */
if (d == NULL) {
Tcl_DStringFree(&ds);
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"couldn't read directory \"%s\": %s",
Tcl_DStringValue(&dsOrig), Tcl_PosixError(interp)));
}
Tcl_DStringFree(&dsOrig);
Tcl_DecrRefCount(fileNamePtr);
return TCL_ERROR;
}
nativeDirLen = Tcl_DStringLength(&ds);
/*
* Check to see if -type or the pattern requests hidden files.
*/
matchHiddenPat = (pattern[0] == '.')
|| ((pattern[0] == '\\') && (pattern[1] == '.'));
matchHidden = matchHiddenPat
|| (types && (types->perm & TCL_GLOB_PERM_HIDDEN));
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 {
#ifdef MAC_OSX_TCL
if (matchHiddenPat) {
continue;
}
/* Also need to check HFS hidden flag in TclMacOSXMatchType. */
#else
if (matchHidden) {
continue;
}
#endif
}
/*
* Now check to see if the file matches, according to both type
* and pattern. If so, add the file to the result.
*/
if (Tcl_ExternalToUtfDStringEx(interp, NULL, entryPtr->d_name, TCL_INDEX_NONE,
0, &utfDs, NULL) != TCL_OK) {
matchResult = -1;
break;
}
utfname = Tcl_DStringValue(&utfDs);
if (Tcl_StringCaseMatch(utfname, pattern, 0)) {
int typeOk = 1;
if (types != NULL) {
Tcl_DStringSetLength(&ds, nativeDirLen);
native = Tcl_DStringAppend(&ds, entryPtr->d_name, TCL_INDEX_NONE);
matchResult = NativeMatchType(interp, native,
entryPtr->d_name, types);
typeOk = (matchResult == 1);
}
if (typeOk) {
Tcl_ListObjAppendElement(interp, resultPtr,
TclNewFSPathObj(pathPtr, utfname,
Tcl_DStringLength(&utfDs)));
}
}
Tcl_DStringFree(&utfDs);
if (matchResult < 0) {
break;
}
}
TclOSclosedir(d);
Tcl_DStringFree(&ds);
Tcl_DStringFree(&dsOrig);
Tcl_DecrRefCount(fileNamePtr);
}
if (matchResult < 0) {
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* NativeMatchType --
*
* This routine is used by the globbing code to check if a file matches a
* given type description.
*
* Results:
* The return value is 1, 0 or -1 indicating whether the file matches the
* given criteria, does not match them, or an error occurred (in which
* case an error is left in interp).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
NativeMatchType(
Tcl_Interp *interp, /* Interpreter to receive errors. */
const char *nativeEntry, /* Native path to check. */
const char *nativeName, /* Native filename 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;
}
return 1;
}
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 OR that the user immutable flag is
* set (where supported).
*/
if (((types->perm & TCL_GLOB_PERM_RONLY) &&
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
!(buf.st_flags & UF_IMMUTABLE) &&
#endif
(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))
#ifndef MAC_OSX_TCL
|| ((types->perm & TCL_GLOB_PERM_HIDDEN) &&
(*nativeName != '.'))
#endif /* MAC_OSX_TCL */
) {
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)
&& (TclOSlstat(nativeEntry, &buf) == 0)
&& S_ISLNK(buf.st_mode)) {
return 1;
}
return 0;
}
}
/*
* In order bcdpsfl 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))||
#ifdef S_ISSOCK
((types->type & TCL_GLOB_TYPE_SOCK) && S_ISSOCK(buf.st_mode))||
#endif /* S_ISSOCK */
((types->type & TCL_GLOB_TYPE_FILE) && S_ISREG(buf.st_mode))) {
/*
* Do nothing - this file is ok.
*/
} else {
#ifdef S_ISLNK
if ((types->type & TCL_GLOB_TYPE_LINK)
&& (TclOSlstat(nativeEntry, &buf) == 0)
&& S_ISLNK(buf.st_mode)) {
goto filetypeOK;
}
#endif /* S_ISLNK */
return 0;
}
}
filetypeOK:
/*
* If we're on OSX, we also have to worry about matching the file creator
* code (if specified). Do that now.
*/
#ifdef MAC_OSX_TCL
if (types->macType != NULL || types->macCreator != NULL ||
(types->perm & TCL_GLOB_PERM_HIDDEN)) {
int matchResult;
if (types->perm == 0 && types->type == 0) {
/*
* We haven't yet done a stat on the file.
*/
if (TclOSstat(nativeEntry, &buf) != 0) {
return 0;
}
}
matchResult = TclMacOSXMatchType(interp, nativeEntry, nativeName,
&buf, types);
if (matchResult != 1) {
return matchResult;
}
}
#else
(void)interp;
#endif /* MAC_OSX_TCL */
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.
*
*----------------------------------------------------------------------
*/
const char *
TclpGetUserHome(
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;
if (Tcl_UtfToExternalDStringEx(NULL, NULL, name, TCL_INDEX_NONE, 0, &ds, NULL) != TCL_OK) {
Tcl_DStringFree(&ds);
return NULL;
}
native = Tcl_DStringValue(&ds);
pwPtr = TclpGetPwNam(native); /* INTL: Native. */
Tcl_DStringFree(&ds);
if (pwPtr == NULL) {
return NULL;
}
if (Tcl_ExternalToUtfDStringEx(NULL, NULL, pwPtr->pw_dir, TCL_INDEX_NONE, 0, bufferPtr, NULL) != TCL_OK) {
return NULL;
} else {
return Tcl_DStringValue(bufferPtr);
}
}
/*
*---------------------------------------------------------------------------
*
* TclpObjAccess --
*
* This function replaces the library version of access().
*
* Results:
* See access() documentation.
*
* Side effects:
* See access() documentation.
*
*---------------------------------------------------------------------------
*/
int
TclpObjAccess(
Tcl_Obj *pathPtr, /* Path of file to access */
int mode) /* Permission setting. */
{
const char *path = (const char *)Tcl_FSGetNativePath(pathPtr);
if (path == NULL) {
return -1;
}
return access(path, mode);
}
/*
*---------------------------------------------------------------------------
*
* TclpObjChdir --
*
* This function replaces the library version of chdir().
*
* Results:
* See chdir() documentation.
*
* Side effects:
* See chdir() documentation.
*
*---------------------------------------------------------------------------
*/
int
TclpObjChdir(
Tcl_Obj *pathPtr) /* Path to new working directory */
{
const char *path = (const char *)Tcl_FSGetNativePath(pathPtr);
if (path == NULL) {
return -1;
}
return chdir(path);
}
/*
*----------------------------------------------------------------------
*
* TclpObjLstat --
*
* This function replaces the library version of lstat().
*
* Results:
* See lstat() documentation.
*
* Side effects:
* See lstat() documentation.
*
*----------------------------------------------------------------------
*/
int
TclpObjLstat(
Tcl_Obj *pathPtr, /* Path of file to stat */
Tcl_StatBuf *bufPtr) /* Filled with results of stat call. */
{
return TclOSlstat((const char *)Tcl_FSGetNativePath(pathPtr), bufPtr);
}
/*
*---------------------------------------------------------------------------
*
* TclpGetNativeCwd --
*
* This function replaces the library version of getcwd().
*
* Results:
* The input and output are filesystem paths in native form. The result
* is either the given clientData, if the working directory hasn't
* changed, or a new clientData (owned by our caller), giving the new
* native path, or NULL if the current directory could not be determined.
* If NULL is returned, the caller can examine the standard Posix error
* codes to determine the cause of the problem.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void *
TclpGetNativeCwd(
void *clientData)
{
char buffer[MAXPATHLEN+1];
#ifdef USEGETWD
if (getwd(buffer) == NULL) { /* INTL: Native. */
return NULL;
}
#else
if (getcwd(buffer, MAXPATHLEN+1) == NULL) { /* INTL: Native. */
return NULL;
}
#endif /* USEGETWD */
if ((clientData == NULL) || strcmp(buffer, (const char *) clientData)) {
char *newCd = (char *)Tcl_Alloc(strlen(buffer) + 1);
strcpy(newCd, buffer);
return newCd;
}
/*
* No change to pwd.
*/
return clientData;
}
/*
*---------------------------------------------------------------------------
*
* TclpGetCwd --
*
* This function replaces the library version of getcwd(). (Obsolete
* function, only retained for old extensions which may call it
* directly).
*
* 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.
*
*----------------------------------------------------------------------
*/
const char *
TclpGetCwd(
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 /* USEGETWD */
{
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"error getting working directory name: %s",
Tcl_PosixError(interp)));
}
return NULL;
}
if (Tcl_ExternalToUtfDStringEx(interp, NULL, buffer, TCL_INDEX_NONE, 0, bufferPtr, NULL) != TCL_OK) {
return NULL;
}
return Tcl_DStringValue(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(
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];
Tcl_Size length;
const char *native;
Tcl_DString ds;
if (Tcl_UtfToExternalDStringEx(NULL, NULL, path, TCL_INDEX_NONE, 0, &ds, NULL) != TCL_OK) {
Tcl_DStringFree(&ds);
return NULL;
}
native = Tcl_DStringValue(&ds);
length = readlink(native, link, sizeof(link)); /* INTL: Native. */
Tcl_DStringFree(&ds);
if (length < 0) {
return NULL;
}
if (Tcl_ExternalToUtfDStringEx(NULL, NULL, link, length, 0, linkPtr, NULL) == TCL_OK) {
return Tcl_DStringValue(linkPtr);
}
#endif /* !DJGPP */
return NULL;
}
/*
*----------------------------------------------------------------------
*
* TclpObjStat --
*
* This function replaces the library version of stat().
*
* Results:
* See stat() documentation.
*
* Side effects:
* See stat() documentation.
*
*----------------------------------------------------------------------
*/
int
TclpObjStat(
Tcl_Obj *pathPtr, /* Path of file to stat */
Tcl_StatBuf *bufPtr) /* Filled with results of stat call. */
{
const char *path = (const char *)Tcl_FSGetNativePath(pathPtr);
if (path == NULL) {
return -1;
}
return TclOSstat(path, bufPtr);
}
#ifdef S_IFLNK
Tcl_Obj *
TclpObjLink(
Tcl_Obj *pathPtr,
Tcl_Obj *toPtr,
int linkAction)
{
if (toPtr != NULL) {
const char *src = (const char *)Tcl_FSGetNativePath(pathPtr);
const char *target = NULL;
if (src == NULL) {
return NULL;
}
/*
* If we're making a symbolic link and the path is relative, then we
* must check whether it exists _relative_ to the directory in which
* the src is found (not relative to the current cwd which is just not
* relevant in this case).
*
* If we're making a hard link, then a relative path is just converted
* to absolute relative to the cwd.
*/
if ((linkAction & TCL_CREATE_SYMBOLIC_LINK)
&& (Tcl_FSGetPathType(toPtr) == TCL_PATH_RELATIVE)) {
Tcl_Obj *dirPtr, *absPtr;
dirPtr = TclPathPart(NULL, pathPtr, TCL_PATH_DIRNAME);
if (dirPtr == NULL) {
return NULL;
}
absPtr = Tcl_FSJoinToPath(dirPtr, 1, &toPtr);
Tcl_IncrRefCount(absPtr);
if (Tcl_FSAccess(absPtr, F_OK) == -1) {
Tcl_DecrRefCount(absPtr);
Tcl_DecrRefCount(dirPtr);
/*
* Target doesn't exist.
*/
errno = ENOENT;
return NULL;
}
/*
* Target exists; we'll construct the relative path we want below.
*/
Tcl_DecrRefCount(absPtr);
Tcl_DecrRefCount(dirPtr);
} else {
target = (const char*)Tcl_FSGetNativePath(toPtr);
if (target == NULL) {
return NULL;
}
if (access(target, F_OK) == -1) {
/*
* Target doesn't exist.
*/
errno = ENOENT;
return NULL;
}
}
if (access(src, F_OK) != -1) {
/*
* Src exists.
*/
errno = EEXIST;
return NULL;
}
/*
* Check symbolic link flag first, since we prefer to create these.
*/
if (linkAction & TCL_CREATE_SYMBOLIC_LINK) {
Tcl_DString ds;
Tcl_Obj *transPtr;
Tcl_Size length;
/*
* Now we don't want to link to the absolute, normalized path.
* Relative links are quite acceptable (but links to ~user are not