11-14-2008
truncate the file from the path with dirname and basename
# dirname /foo/../bar/file
/foo/../bar
# basename /foo/../bar/file
file
clear the path and stick it together again
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LEARN ABOUT MOJAVE
dirname
DIRNAME(3) BSD Library Functions Manual DIRNAME(3)
NAME
dirname -- extract the directory part of a pathname
SYNOPSIS
#include <libgen.h>
char *
dirname(char *path);
char *
dirname_r(const char *path, char *dname);
DESCRIPTION
The dirname() function is the converse of basename(3); it returns a pointer to the parent directory of the pathname pointed to by path. Any
trailing '/' characters are not counted as part of the directory name. If path is a null pointer, the empty string, or contains no '/' char-
acters, dirname() returns a pointer to the string ".", signifying the current directory.
IMPLEMENTATION NOTES
The dirname() function returns a pointer to internal storage space allocated on the first call that will be overwritten by subsequent calls.
dirname_r() is therefore preferred for threaded applications.
Other vendor implementations of dirname() may modify the contents of the string passed to dirname(); if portability is desired, this should
be taken into account when writing code which calls this function.
LEGACY SYNOPSIS
#include <libgen.h>
char *
dirname(const char *path);
In legacy mode, path will not be changed.
RETURN VALUES
On successful completion, dirname() returns a pointer to the parent directory of path.
If dirname() fails, a null pointer is returned and the global variable errno is set to indicate the error.
ERRORS
The following error codes may be set in errno:
[ENAMETOOLONG] The path component to be returned was larger than MAXPATHLEN.
[ENOMEM] The static buffer used for storing the path in dirname() could not be allocated.
SEE ALSO
basename(1), dirname(1), basename(3), compat(5)
STANDARDS
The dirname() function conforms to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'').
HISTORY
The dirname() function first appeared in OpenBSD 2.2 and FreeBSD 4.2. The dirname_r() function first appeared in OS X 10.12.
AUTHORS
Todd C. Miller
BSD
October 12, 2006 BSD