dirname man page on OpenBSD

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DIRNAME(3)		  OpenBSD Programmer's Manual		    DIRNAME(3)

NAME
     dirname - extract the directory portion of a pathname

SYNOPSIS
     #include <libgen.h>

     char *
     dirname(const char *path);

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 `/'
     characters, dirname() returns a pointer to the string ".", signifying the
     current directory.

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.

SEE ALSO
     basename(1), dirname(1), basename(3)

STANDARDS
     The dirname() function conforms to X/Open Portability Guide Issue 4.2
     (``XPG4.2'').

HISTORY
     The dirname() function first appeared in OpenBSD 2.2.

AUTHORS
     Todd C. Miller

CAVEATS
     dirname() returns a pointer to internal static storage space that will be
     overwritten by subsequent calls (each function has its own separate
     storage).

     Other vendor implementations of dirname() may modify the contents of the
     string passed to dirname(); this should be taken into account when
     writing code which calls this function if portability is desired.

OpenBSD 4.9			 April 1, 2010			   OpenBSD 4.9
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