Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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$FreeBSD: head/lib/libc/gen/basename.3 223216 2011-06-18 00:33:34Z delphij $
.Dd March 31, 2010 .Dt BASENAME 3 .Os .Sh NAME .Nm basename .Nd extract the base portion of a pathname .Sh SYNOPSIS n libgen.h .Ft char * .Fn basename "const char *path" .Ft char * .Fn basename_r "const char *path" "char *bname" .Sh DESCRIPTION The .Fn basename function returns the last component from the pathname pointed to by .Fa path , deleting any trailing .Sq / characters. If .Fa path consists entirely of .Sq / characters, a pointer to the string .Qq / is returned. If .Fa path is a null pointer or the empty string, a pointer to the string .Qq . is returned.
p The .Fn basename_r variation accepts a buffer of at least .Dv MAXPATHLEN bytes in which to store the resulting component. .Sh IMPLEMENTATION NOTES The .Fn basename function returns a pointer to internal storage space allocated on the first call that will be overwritten by subsequent calls. .Fn basename_r is therefore preferred for threaded applications. .Sh RETURN VALUES On successful completion, .Fn basename and .Fn basename_r return pointers to the last component of .Fa path .
p If they fail, a null pointer is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS The following error codes may be set in .Va errno : l -tag -width Er t Bq Er ENAMETOOLONG The path component to be returned was larger than .Dv MAXPATHLEN . .El .Sh SEE ALSO .Xr basename 1 , .Xr dirname 1 , .Xr dirname 3 .Sh STANDARDS The .Fn basename function conforms to .St -xpg4.2 . .Sh HISTORY The .Fn basename function first appeared in .Ox 2.2 and .Fx 4.2 . .Sh AUTHORS .An Todd C. Miller .Sh CAVEATS .Fn basename returns a pointer to internal static storage space that will be overwritten by subsequent calls.
p Other vendor implementations of .Fn basename may modify the contents of the string passed to .Fn basename ; this should be taken into account when writing code which calls this function if portability is desired.