BASENAME(P) POSIX Programmer's Manual BASENAME(P)
basename - return the last component of a pathname
char *basename(char *path);
The basename() function shall take the pathname pointed to by path and return a pointer to
the final component of the pathname, deleting any trailing '/' characters.
If the string consists entirely of the '/' character, basename() shall return a pointer to
the string "/" . If the string is exactly "//" , it is implementation-defined whether '/'
or "//" is returned.
If path is a null pointer or points to an empty string, basename() shall return a pointer
to the string "." .
The basename() function may modify the string pointed to by path, and may return a pointer
to static storage that may then be overwritten by a subsequent call to basename().
The basename() function need not be reentrant. A function that is not required to be reen-
trant is not required to be thread-safe.
The basename() function shall return a pointer to the final component of path.
No errors are defined.
The following sections are informative.
The following program fragment returns a pointer to the value lib, which is the base name
char *name = "/usr/lib";
base = basename(name);
Sample Input and Output Strings for basename()
In the following table, the input string is the value pointed to by path, and the output
string is the return value of the basename() function.
Input String Output String
dirname() , the Base Definitions volume of IEEE Std 1003.1-2001, <libgen.h>, the Shell and
Utilities volume of IEEE Std 1003.1-2001, basename
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 BASENAME(P)