XtFindFile - search for a file using substitutions in the path list
#include <X11/Intrinsic.h>
char * XtFindFile(const char *path, Substitution
substitutions, Cardinal num_substitutions, XtFilePredicate
predicate);
- 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.
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.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface