Flashnux

GNU/Linux man pages

Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

CentOS 2.1AS

(Slurm)

basename(3)


DIRNAME

DIRNAME

NAME
SYNOPSIS
DESCRIPTION
EXAMPLE
RETURN VALUE
BUGS
CONFORMING TO
SEE ALSO

NAME

dirname, basename − Parse pathname components

SYNOPSIS

#include <libgen.h>

char *dirname(char *path);
char *basename(char
*path);

DESCRIPTION

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 if you need to preserve the pathname string, copies should be passed to these functions. Furthermore, dirname and basename may return pointers to statically allocated memory which may overwritten by subsequent calls.

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"

"/"

"/"

"/"

"."

"."

"."

".."

"."

".."

EXAMPLE

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);
free(dirc);
free(basec);

RETURN VALUE

Both dirname and basename return pointers to null-terminated strings.

BUGS

In versions of glibc up to and including 2.2.1, dirname does not correctly handle pathnames with trailing ’/’ characters, and generates a segmentation violation if given a NULL argument.

CONFORMING TO

SUSv2

SEE ALSO

dirname(1), basename(1),



basename(3)