dirname man page on Archlinux

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BASENAME(3)		   Linux Programmer's Manual		   BASENAME(3)

       basename, dirname - parse pathname components

       #include <libgen.h>

       char *dirname(char *path);

       char *basename(char *path);

       Warning: there are two different functions basename() - see below.

       The functions dirname() and basename() break a null-terminated pathname
       string into directory and filename  components.	 In  the  usual	 case,
       dirname()  returns  the string up to, but not including, the final '/',
       and basename() returns the component following the final '/'.  Trailing
       '/' characters are not counted as part of the pathname.

       If  path	 does  not  contain  a slash, dirname() returns the string "."
       while basename() returns a copy of path.	 If path is  the  string  "/",
       then both dirname() and basename() return the string "/".  If path is a
       null pointer or points to an empty  string,  then  both	dirname()  and
       basename() return the string ".".

       Concatenating  the  string returned by dirname(), a "/", and the string
       returned by basename() yields a complete pathname.

       Both dirname() and basename() may modify the contents of	 path,	so  it
       may be desirable to pass a copy when calling one of these functions.

       These  functions	 may  return  pointers	to statically allocated memory
       which may be overwritten by subsequent calls.  Alternatively, they  may
       return  a  pointer to some part of path, so that the string referred to
       by path should not be modified or freed until the pointer  returned  by
       the function is no longer required.

       The  following  list  of	 examples (taken from SUSv2) shows the strings
       returned by dirname() and basename() for different paths:

       path	  dirname   basename
       /usr/lib	  /usr	    lib
       /usr/	  /	    usr
       usr	  .	    usr
       /	  /	    /
       .	  .	    .
       ..	  .	    ..

       Both  dirname()	and  basename()	 return	 pointers  to  null-terminated
       strings.	 (Do not pass these pointers to free(3).)


       There  are  two	different  versions  of basename() - the POSIX version
       described above, and the GNU version, which one gets after

	   #define _GNU_SOURCE	       /* See feature_test_macros(7) */
	   #include <string.h>

       The GNU version never modifies its  argument,  and  returns  the	 empty
       string  when  path has a trailing slash, and in particular also when it
       is "/".	There is no GNU version of dirname().

       With glibc, one gets the POSIX version of basename() when <libgen.h> is
       included, and the GNU version otherwise.

       In  the	glibc  implementation of the POSIX versions of these functions
       they modify their argument, and segfault	 when  called  with  a	static
       string  like  "/usr/".	Before	glibc  2.2.1,  the  glibc  version  of
       dirname() did not correctly handle pathnames with trailing '/'  characā€
       ters, and generated a segfault if given a NULL argument.

	   char *dirc, *basec, *bname, *dname;
	   char *path = "/etc/passwd";

	   dirc = strdup(path);
	   basec = strdup(path);
	   dname = dirname(dirc);
	   bname = basename(basec);
	   printf("dirname=%s, basename=%s\n", dname, bname);

       basename(1), dirname(1)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2009-03-30			   BASENAME(3)

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