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tclFCmd.c

/*
 * tclFCmd.c
 *
 *      This file implements the generic portion of file manipulation 
 *      subcommands of the "file" command. 
 *
 * Copyright (c) 1996-1998 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: tclFCmd.c,v 1.6 1999/07/01 23:21:07 redman Exp $
 */

#include "tclInt.h"
#include "tclPort.h"

/*
 * Declarations for local procedures defined in this file:
 */

static int        CopyRenameOneFile _ANSI_ARGS_((Tcl_Interp *interp,
                      char *source, char *dest, int copyFlag,
                      int force));
static char *           FileBasename _ANSI_ARGS_((Tcl_Interp *interp,
                      char *path, Tcl_DString *bufferPtr));
static int        FileCopyRename _ANSI_ARGS_((Tcl_Interp *interp,
                      int argc, char **argv, int copyFlag));
static int        FileForceOption _ANSI_ARGS_((Tcl_Interp *interp,
                      int argc, char **argv, int *forcePtr));

/*
 *---------------------------------------------------------------------------
 *
 * TclFileRenameCmd
 *
 *    This procedure implements the "rename" subcommand of the "file"
 *      command.  Filename arguments need to be translated to native
 *    format before being passed to platform-specific code that
 *    implements rename functionality.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *---------------------------------------------------------------------------
 */

int
TclFileRenameCmd(interp, argc, argv)
    Tcl_Interp *interp;       /* Interp for error reporting. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings passed to Tcl_FileCmd. */
{
    return FileCopyRename(interp, argc, argv, 0);
}

/*
 *---------------------------------------------------------------------------
 *
 * TclFileCopyCmd
 *
 *    This procedure implements the "copy" subcommand of the "file"
 *    command.  Filename arguments need to be translated to native
 *    format before being passed to platform-specific code that
 *    implements copy functionality.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *---------------------------------------------------------------------------
 */

int
TclFileCopyCmd(interp, argc, argv)
    Tcl_Interp *interp;       /* Used for error reporting */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings passed to Tcl_FileCmd. */
{
    return FileCopyRename(interp, argc, argv, 1);
}

/*
 *---------------------------------------------------------------------------
 *
 * FileCopyRename --
 *
 *    Performs the work of TclFileRenameCmd and TclFileCopyCmd.
 *    See comments for those procedures.
 *
 * Results:
 *    See above.
 *
 * Side effects:
 *    See above.
 *
 *---------------------------------------------------------------------------
 */

static int
FileCopyRename(interp, argc, argv, copyFlag)
    Tcl_Interp *interp;       /* Used for error reporting. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings passed to Tcl_FileCmd. */
    int copyFlag;       /* If non-zero, copy source(s).  Otherwise,
                         * rename them. */
{
    int i, result, force;
    struct stat statBuf; 
    Tcl_DString targetBuffer;
    char *target;

    i = FileForceOption(interp, argc - 2, argv + 2, &force);
    if (i < 0) {
      return TCL_ERROR;
    }
    i += 2;
    if ((argc - i) < 2) {
      Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
            " ", argv[1], " ?options? source ?source ...? target\"", 
            (char *) NULL);
      return TCL_ERROR;
    }

    /*
     * If target doesn't exist or isn't a directory, try the copy/rename.
     * More than 2 arguments is only valid if the target is an existing
     * directory.
     */

    target = Tcl_TranslateFileName(interp, argv[argc - 1], &targetBuffer);
    if (target == NULL) {
      return TCL_ERROR;
    }

    result = TCL_OK;

    /*
     * Call TclStat() so that if target is a symlink that points to a
     * directory we will put the sources in that directory instead of
     * overwriting the symlink.
     */

    if ((TclStat(target, &statBuf) != 0) || !S_ISDIR(statBuf.st_mode)) {
      if ((argc - i) > 2) {
          errno = ENOTDIR;
          Tcl_PosixError(interp);
          Tcl_AppendResult(interp, "error ",
                ((copyFlag) ? "copying" : "renaming"), ": target \"",
                argv[argc - 1], "\" is not a directory", (char *) NULL);
          result = TCL_ERROR;
      } else {
          /*
           * Even though already have target == translated(argv[i+1]),
           * pass the original argument down, so if there's an error, the
           * error message will reflect the original arguments.
           */

          result = CopyRenameOneFile(interp, argv[i], argv[i + 1], copyFlag,
                force);
      }
      Tcl_DStringFree(&targetBuffer);
      return result;
    }
    
    /*
     * Move each source file into target directory.  Extract the basename
     * from each source, and append it to the end of the target path.
     */

    for ( ; i < argc - 1; i++) {
      char *jargv[2];
      char *source, *newFileName;
      Tcl_DString sourceBuffer, newFileNameBuffer;

      source = FileBasename(interp, argv[i], &sourceBuffer);
      if (source == NULL) {
          result = TCL_ERROR;
          break;
      }
      jargv[0] = argv[argc - 1];
      jargv[1] = source;
      Tcl_DStringInit(&newFileNameBuffer);
      newFileName = Tcl_JoinPath(2, jargv, &newFileNameBuffer);
      result = CopyRenameOneFile(interp, argv[i], newFileName, copyFlag,
            force);
      Tcl_DStringFree(&sourceBuffer);
      Tcl_DStringFree(&newFileNameBuffer);

      if (result == TCL_ERROR) {
          break;
      }
    }
    Tcl_DStringFree(&targetBuffer);
    return result;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclFileMakeDirsCmd
 *
 *    This procedure implements the "mkdir" subcommand of the "file"
 *      command.  Filename arguments need to be translated to native
 *    format before being passed to platform-specific code that
 *    implements mkdir functionality.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */
int
TclFileMakeDirsCmd(interp, argc, argv)
    Tcl_Interp *interp;       /* Used for error reporting. */
    int argc;                 /* Number of arguments */
    char **argv;        /* Argument strings passed to Tcl_FileCmd. */
{
    Tcl_DString nameBuffer, targetBuffer;
    char *errfile;
    int result, i, j, pargc;
    char **pargv;
    struct stat statBuf;

    pargv = NULL;
    errfile = NULL;
    Tcl_DStringInit(&nameBuffer);
    Tcl_DStringInit(&targetBuffer);

    result = TCL_OK;
    for (i = 2; i < argc; i++) {
      char *name = Tcl_TranslateFileName(interp, argv[i], &nameBuffer);
      if (name == NULL) {
          result = TCL_ERROR;
          break;
      }

      Tcl_SplitPath(name, &pargc, &pargv);
      if (pargc == 0) {
          errno = ENOENT;
          errfile = argv[i];
          break;
      }
      for (j = 0; j < pargc; j++) {
          char *target = Tcl_JoinPath(j + 1, pargv, &targetBuffer);

          /*
           * Call TclStat() so that if target is a symlink that points
           * to a directory we will create subdirectories in that
           * directory.
           */

          if (TclStat(target, &statBuf) == 0) {
            if (!S_ISDIR(statBuf.st_mode)) {
                errno = EEXIST;
                errfile = target;
                goto done;
            }
          } else if ((errno != ENOENT)
                || (TclpCreateDirectory(target) != TCL_OK)) {
            errfile = target;
            goto done;
          }
          Tcl_DStringFree(&targetBuffer);
      }
      ckfree((char *) pargv);
      pargv = NULL;
      Tcl_DStringFree(&nameBuffer);
    }
      
    done:
    if (errfile != NULL) {
      Tcl_AppendResult(interp, "can't create directory \"",
            errfile, "\": ", Tcl_PosixError(interp), (char *) NULL);
      result = TCL_ERROR;
    }

    Tcl_DStringFree(&nameBuffer);
    Tcl_DStringFree(&targetBuffer);
    if (pargv != NULL) {
      ckfree((char *) pargv);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclFileDeleteCmd
 *
 *    This procedure implements the "delete" subcommand of the "file"
 *      command.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
TclFileDeleteCmd(interp, argc, argv)
    Tcl_Interp *interp;       /* Used for error reporting */
    int argc;                 /* Number of arguments */
    char **argv;        /* Argument strings passed to Tcl_FileCmd. */
{
    Tcl_DString nameBuffer, errorBuffer;
    int i, force, result;
    char *errfile;
    
    i = FileForceOption(interp, argc - 2, argv + 2, &force);
    if (i < 0) {
      return TCL_ERROR;
    }
    i += 2;
    if ((argc - i) < 1) {
      Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
            " ", argv[1], " ?options? file ?file ...?\"", (char *) NULL);
      return TCL_ERROR;
    }

    errfile = NULL;
    result = TCL_OK;
    Tcl_DStringInit(&errorBuffer);
    Tcl_DStringInit(&nameBuffer);

    for ( ; i < argc; i++) {
      struct stat statBuf;
      char *name;

      errfile = argv[i];
      Tcl_DStringSetLength(&nameBuffer, 0);
      name = Tcl_TranslateFileName(interp, argv[i], &nameBuffer);
      if (name == NULL) {
          result = TCL_ERROR;
          goto done;
      }

      /*
       * Call lstat() to get info so can delete symbolic link itself.
       */

      if (TclpLstat(name, &statBuf) != 0) {
          /*
           * Trying to delete a file that does not exist is not
           * considered an error, just a no-op
           */

          if (errno != ENOENT) {
            result = TCL_ERROR;
          }
      } else if (S_ISDIR(statBuf.st_mode)) {
          result = TclpRemoveDirectory(name, force, &errorBuffer);
          if (result != TCL_OK) {
            if ((force == 0) && (errno == EEXIST)) {
                Tcl_AppendResult(interp, "error deleting \"", argv[i],
                      "\": directory not empty", (char *) NULL);
                Tcl_PosixError(interp);
                goto done;
            }

            /* 
             * If possible, use the untranslated name for the file.
             */
             
            errfile = Tcl_DStringValue(&errorBuffer);
            if (strcmp(name, errfile) == 0) {
                errfile = argv[i];
            }
          }
      } else {
          result = TclpDeleteFile(name);
      }
      
      if (result == TCL_ERROR) {
          break;
      }
    }
    if (result != TCL_OK) {
      Tcl_AppendResult(interp, "error deleting \"", errfile,
            "\": ", Tcl_PosixError(interp), (char *) NULL);
    } 
    done:
    Tcl_DStringFree(&errorBuffer);
    Tcl_DStringFree(&nameBuffer);
    return result;
}

/*
 *---------------------------------------------------------------------------
 *
 * CopyRenameOneFile
 *
 *    Copies or renames specified source file or directory hierarchy
 *    to the specified target.  
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    Target is overwritten if the force flag is set.  Attempting to
 *    copy/rename a file onto a directory or a directory onto a file
 *    will always result in an error.  
 *
 *----------------------------------------------------------------------
 */

static int
CopyRenameOneFile(interp, source, target, copyFlag, force) 
    Tcl_Interp *interp;       /* Used for error reporting. */
    char *source;       /* Pathname of file to copy.  May need to
                         * be translated. */
    char *target;       /* Pathname of file to create/overwrite.
                         * May need to be translated. */
    int copyFlag;       /* If non-zero, copy files.  Otherwise,
                         * rename them. */
    int force;                /* If non-zero, overwrite target file if it
                         * exists.  Otherwise, error if target already
                         * exists. */
{
    int result;
    Tcl_DString sourcePath, targetPath, errorBuffer;
    char *targetName, *sourceName, *errfile;
    struct stat sourceStatBuf, targetStatBuf;

    sourceName = Tcl_TranslateFileName(interp, source, &sourcePath);
    if (sourceName == NULL) {
      return TCL_ERROR;
    }
    targetName = Tcl_TranslateFileName(interp, target, &targetPath);
    if (targetName == NULL) {
      Tcl_DStringFree(&sourcePath);
      return TCL_ERROR;
    }
    
    errfile = NULL;
    result = TCL_ERROR;
    Tcl_DStringInit(&errorBuffer);
    
    /*
     * We want to copy/rename links and not the files they point to, so we
     * use lstat(). If target is a link, we also want to replace the 
     * link and not the file it points to, so we also use lstat() on the
     * target.
     */

    if (TclpLstat(sourceName, &sourceStatBuf) != 0) {
      errfile = source;
      goto done;
    }
    if (TclpLstat(targetName, &targetStatBuf) != 0) {
      if (errno != ENOENT) {
          errfile = target;
          goto done;
      }
    } else {
      if (force == 0) {
          errno = EEXIST;
          errfile = target;
          goto done;
      }

        /* 
         * Prevent copying or renaming a file onto itself.  Under Windows, 
         * stat always returns 0 for st_ino.  However, the Windows-specific 
         * code knows how to deal with copying or renaming a file on top of
         * itself.  It might be a good idea to write a stat that worked.
         */
     
        if ((sourceStatBuf.st_ino != 0) && (targetStatBuf.st_ino != 0)) {
            if ((sourceStatBuf.st_ino == targetStatBuf.st_ino) &&
                      (sourceStatBuf.st_dev == targetStatBuf.st_dev)) {
                  result = TCL_OK;
                  goto done;
            }
        }

      /*
       * Prevent copying/renaming a file onto a directory and
       * vice-versa.  This is a policy decision based on the fact that
       * existing implementations of copy and rename on all platforms
       * also prevent this.
       */

      if (S_ISDIR(sourceStatBuf.st_mode)
                && !S_ISDIR(targetStatBuf.st_mode)) {
          errno = EISDIR;
          Tcl_AppendResult(interp, "can't overwrite file \"", target,
                "\" with directory \"", source, "\"", (char *) NULL);
          goto done;
      }
      if (!S_ISDIR(sourceStatBuf.st_mode)
              && S_ISDIR(targetStatBuf.st_mode)) {
          errno = EISDIR;
          Tcl_AppendResult(interp, "can't overwrite directory \"", target, 
                  "\" with file \"", source, "\"", (char *) NULL);
          goto done;
      }
    }

    if (copyFlag == 0) {
      result = TclpRenameFile(sourceName, targetName);
      if (result == TCL_OK) {
          goto done;
      }
          
      if (errno == EINVAL) {
          Tcl_AppendResult(interp, "error renaming \"", source, "\" to \"",
                target, "\": trying to rename a volume or ",
                "move a directory into itself", (char *) NULL);
          goto done;
      } else if (errno != EXDEV) {
          errfile = target;
          goto done;
      }
      
      /*
       * The rename failed because the move was across file systems.
       * Fall through to copy file and then remove original.  Note that
       * the low-level TclpRenameFile is allowed to implement
       * cross-filesystem moves itself.
       */
    }

    if (S_ISDIR(sourceStatBuf.st_mode)) {
      result = TclpCopyDirectory(sourceName, targetName, &errorBuffer);
      if (result != TCL_OK) {
          errfile = Tcl_DStringValue(&errorBuffer);
          if (strcmp(errfile, sourceName) == 0) {
            errfile = source;
          } else if (strcmp(errfile, targetName) == 0) {
            errfile = target;
          }
      }
    } else {
      result = TclpCopyFile(sourceName, targetName);
      if (result != TCL_OK) {
          /*
           * Well, there really shouldn't be a problem with source,
           * because up there we checked to see if it was ok to copy it.
           */

          errfile = target;
      }
    }
    if ((copyFlag == 0) && (result == TCL_OK)) {
      if (S_ISDIR(sourceStatBuf.st_mode)) {
          result = TclpRemoveDirectory(sourceName, 1, &errorBuffer);
          if (result != TCL_OK) {
            errfile = Tcl_DStringValue(&errorBuffer);
            if (strcmp(errfile, sourceName) == 0) {
                errfile = source;
            }
          }
      } else {
          result = TclpDeleteFile(sourceName);
          if (result != TCL_OK) {
            errfile = source;
          }
      }
      if (result != TCL_OK) {
          Tcl_AppendResult(interp, "can't unlink \"", errfile, "\": ",
                Tcl_PosixError(interp), (char *) NULL);
          errfile = NULL;
      }
    }
    
    done:
    if (errfile != NULL) {
      Tcl_AppendResult(interp, 
            ((copyFlag) ? "error copying \"" : "error renaming \""),
            source, (char *) NULL);
      if (errfile != source) {
          Tcl_AppendResult(interp, "\" to \"", target, (char *) NULL);
          if (errfile != target) {
            Tcl_AppendResult(interp, "\": \"", errfile, (char *) NULL);
          }
      }
      Tcl_AppendResult(interp, "\": ", Tcl_PosixError(interp),
            (char *) NULL);
    }
    Tcl_DStringFree(&errorBuffer);
    Tcl_DStringFree(&sourcePath);
    Tcl_DStringFree(&targetPath);
    return result;
}

/*
 *---------------------------------------------------------------------------
 *
 * FileForceOption --
 *
 *    Helps parse command line options for file commands that take
 *    the "-force" and "--" options.
 *
 * Results:
 *    The return value is how many arguments from argv were consumed
 *    by this function, or -1 if there was an error parsing the
 *    options.  If an error occurred, an error message is left in the
 *    interp's result.
 *
 * Side effects:
 *    None.
 *
 *---------------------------------------------------------------------------
 */

static int
FileForceOption(interp, argc, argv, forcePtr)
    Tcl_Interp *interp;       /* Interp, for error return. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings.  First command line
                         * option, if it exists, begins at 0. */
    int *forcePtr;            /* If the "-force" was specified, *forcePtr
                         * is filled with 1, otherwise with 0. */
{
    int force, i;
    
    force = 0;
    for (i = 0; i < argc; i++) {
      if (argv[i][0] != '-') {
          break;
      }
      if (strcmp(argv[i], "-force") == 0) {
          force = 1;
      } else if (strcmp(argv[i], "--") == 0) {
          i++;
          break;
      } else {
          Tcl_AppendResult(interp, "bad option \"", argv[i], 
                "\": should be -force or --", (char *)NULL);
          return -1;
      }
    }
    *forcePtr = force;
    return i;
}
/*
 *---------------------------------------------------------------------------
 *
 * FileBasename --
 *
 *    Given a path in either tcl format (with / separators), or in the
 *    platform-specific format for the current platform, return all the
 *    characters in the path after the last directory separator.  But,
 *    if path is the root directory, returns no characters.
 *
 * Results:
 *    Appends the string that represents the basename to the end of
 *    the specified initialized DString, returning a pointer to the
 *    resulting string.  If there is an error, an error message is left
 *    in interp, NULL is returned, and the Tcl_DString is unmodified.
 *
 * Side effects:
 *    None.
 *
 *---------------------------------------------------------------------------
 */

static char *
FileBasename(interp, path, bufferPtr)
    Tcl_Interp *interp;       /* Interp, for error return. */
    char *path;               /* Path whose basename to extract. */
    Tcl_DString *bufferPtr;   /* Initialized DString that receives
                         * basename. */
{
    int argc;
    char **argv;
    
    Tcl_SplitPath(path, &argc, &argv);
    if (argc == 0) {
      Tcl_DStringInit(bufferPtr);
    } else {
      if ((argc == 1) && (*path == '~')) {
          Tcl_DString buffer;
          
          ckfree((char *) argv);
          path = Tcl_TranslateFileName(interp, path, &buffer);
          if (path == NULL) {
            return NULL;
          }
          Tcl_SplitPath(path, &argc, &argv);
          Tcl_DStringFree(&buffer);
      }
      Tcl_DStringInit(bufferPtr);

      /*
       * Return the last component, unless it is the only component, and it
       * is the root of an absolute path.
       */

      if (argc > 0) {
          if ((argc > 1)
                || (Tcl_GetPathType(argv[0]) == TCL_PATH_RELATIVE)) {
            Tcl_DStringAppend(bufferPtr, argv[argc - 1], -1);
          }
      }
    }
    ckfree((char *) argv);
    return Tcl_DStringValue(bufferPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclFileAttrsCmd --
 *
 *      Sets or gets the platform-specific attributes of a file. The objc-objv
 *    points to the file name with the rest of the command line following.
 *    This routine uses platform-specific tables of option strings
 *    and callbacks. The callback to get the attributes take three
 *    parameters:
 *        Tcl_Interp *interp;     The interp to report errors with.
 *                          Since this is an object-based API,
 *                          the object form of the result should be
 *                          used.
 *        CONST char *fileName;   This is extracted using
 *                          Tcl_TranslateFileName.
 *        TclObj **attrObjPtrPtr; A new object to hold the attribute
 *                          is allocated and put here.
 *    The first two parameters of the callback used to write out the
 *    attributes are the same. The third parameter is:
 *        CONST *attrObjPtr;      A pointer to the object that has
 *                          the new attribute.
 *    They both return standard TCL errors; if the routine to get
 *    an attribute fails, no object is allocated and *attrObjPtrPtr
 *    is unchanged.
 *
 * Results:
 *      Standard TCL error.
 *
 * Side effects:
 *      May set file attributes for the file name.
 *      
 *----------------------------------------------------------------------
 */

int
TclFileAttrsCmd(interp, objc, objv)
    Tcl_Interp *interp;       /* The interpreter for error reporting. */
    int objc;                 /* Number of command line arguments. */
    Tcl_Obj *CONST objv[];    /* The command line objects. */
{
    char *fileName;
    int result;
    Tcl_DString buffer;

    if (objc < 3) {
      Tcl_WrongNumArgs(interp, 2, objv,
            "name ?option? ?value? ?option value ...?");
      return TCL_ERROR;
    }

    fileName = Tcl_GetString(objv[2]);
    fileName = Tcl_TranslateFileName(interp, fileName, &buffer);
    if (fileName == NULL) {
      return TCL_ERROR;
    }
    
    objc -= 3;
    objv += 3;
    result = TCL_ERROR;

    if (objc == 0) {
      /*
       * Get all attributes.
       */

      int index;
      Tcl_Obj *listPtr, *objPtr;
       
      listPtr = Tcl_NewListObj(0, NULL);
      for (index = 0; tclpFileAttrStrings[index] != NULL; index++) {
          objPtr = Tcl_NewStringObj(tclpFileAttrStrings[index], -1);
          Tcl_ListObjAppendElement(interp, listPtr, objPtr);

          if ((*tclpFileAttrProcs[index].getProc)(interp, index, fileName,
                &objPtr) != TCL_OK) {
            Tcl_DecrRefCount(listPtr);
            goto end;
          }
          Tcl_ListObjAppendElement(interp, listPtr, objPtr);
      }
      Tcl_SetObjResult(interp, listPtr);
    } else if (objc == 1) {
      /*
       * Get one attribute.
       */

      int index;
      Tcl_Obj *objPtr;
       
      if (Tcl_GetIndexFromObj(interp, objv[0], tclpFileAttrStrings,
            "option", 0, &index) != TCL_OK) {
          goto end;
      }
      if ((*tclpFileAttrProcs[index].getProc)(interp, index, fileName,
            &objPtr) != TCL_OK) {
          goto end;
      }
      Tcl_SetObjResult(interp, objPtr);
    } else {
      /*
       * Set option/value pairs.
       */

      int i, index;
        
      for (i = 0; i < objc ; i += 2) {
          if (Tcl_GetIndexFromObj(interp, objv[i], tclpFileAttrStrings,
                "option", 0, &index) != TCL_OK) {
            goto end;
          }
          if (i + 1 == objc) {
            Tcl_AppendResult(interp, "value for \"",
                  Tcl_GetString(objv[i]), "\" missing",
                  (char *) NULL);
            goto end;
          }
          if ((*tclpFileAttrProcs[index].setProc)(interp, index, fileName,
                objv[i + 1]) != TCL_OK) {
            goto end;
          }
      }
    }
    result = TCL_OK;

    end:
    Tcl_DStringFree(&buffer);
    return result;
}

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