xtfilepredicate(2) [hpux man page]

XtFilePredicate()														 XtFilePredicate()

Name
  XtFilePredicate - interface definition for a filename evaluation procedure.

Synopsis
  typedef Boolean (*XtFilePredicate)(String);
	 String filename;

Inputs
  filename  Specifies a potential filename.

Returns
  True if filename is acceptable; False otherwise.

Description
  An  XtFilePredicate  is  specified in calls to XtResolvePathname() and XtFindFile(), and is called to judge filenames found by those proce-
  dures.  If the string is appropriate for the intended use (if it names a readable file, for example) then the XtFilePredicate should return
  True; otherwise it should return False.

Example
  The default predicate used by XtResolvePathname() and XtFindFile() simply tests that the specified filename exists, is readable, and is not
  a directory.	This default procedure is shown below.	Note that it attempts to handle some operating system dependencies.

     static Boolean TestFile(path)
	 String path;
     {
     #ifdef VMS
	 return TRUE;	     /* Who knows what to do here? */
     #else
	 struct stat status;

	 return (access(path, R_OK) == 0 &&	     /* exists and is readable */
		 stat(path, &status) == 0 &&	     /* get the status */
     #ifndef X_NOT_POSIX
		 S_ISDIR(status.st_mode) == 0);      /* not a directory */
     #else
		 (status.st_mode & S_IFDIR) == 0);   /* not a directory */
     #endif /* X_NOT_POSIX else */
     #endif /* VMS */
     }

See Also
  XtFindFile(1), XtResolvePathname(1).

Xt - File Searching														 XtFilePredicate()

XtFindFile(3)							   XT FUNCTIONS 						     XtFindFile(3)

NAME

       XtFindFile - search for a file using substitutions in the path list

SYNTAX

       String XtFindFile(String path, Substitution substitutions, Cardinal num_substitutions, XtFilePredicate predicate);

ARGUMENTS

       path	 Specifies a path of file names, including substitution characters.

       substitutions
		 Specifies a list of substitutions to make into a path.

       num_substitutions
		 Specifies the number of substitutions passed in.

       predicate Specifies a procedure to call to judge a potential file name, or NULL.

DESCRIPTION

       The path parameter specifies a string that consists of a series of potential file names delimited by colons.  Within each name, the percent
       character specifies a string substitution selected by the following character.  The character sequence ``%:'' specifies an embedded colon
       that is not a delimiter; the sequence is replaced by a single colon.  The character sequence ``%%'' specifies a percent character that does
       not introduce a substitution; the sequence is replaced by a single percent character.  If a percent character is followed by any other
       character, XtFindFile looks through the specified substitutions for that character in the match field and if found replaces the percent and
       match characters with the string in the corresponding substitution field.  A substitution field entry of NULL is equivalent to a pointer to
       an empty string.  If the operating system does not interpret multiple embedded name separators in the path (i.e., ``/'' in POSIX) the same
       way as a single separator, XtFindFile will collapse multiple separators into a single one after performing all string substitutions.
       Except for collapsing embedded separators, the contents of the string substitutions are not interpreted by XtFindFile and may therefore
       contain any operating-system-dependent characters, including additional name separators.  Each resulting string is passed to the predicate
       procedure until a string is found for which the procedure returns True; this string is the return value for XtFindFile.	If no string
       yields a True return from the predicate, XtFindFile returns NULL.

       If the predicate parameter is NULL, an internal procedure that checks if the file exists, is readable, and is not a directory will be used.

       It is the responsibility of the caller to free the returned string using XtFree when it is no longer needed.

SEE ALSO

       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11							    libXt 1.0.5 						     XtFindFile(3)