DIRNAME(3) BSD Programmer's Manual DIRNAME(3)
dirname - extract the directory portion of a pathname
#include <libgen.h> char * dirname(const char *path);
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.
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.
The following error codes may be set in errno: [ENAMETOOLONG] The path component to be returned was larger than MAXPATHLEN.
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 writ- ing code which calls this function if portability is desired.
basename(1), dirname(1), basename(3)
The dirname() function conforms to X/Open Portability Guide Issue 4.2 ("XPG4.2").
The dirname() function first appeared in OpenBSD 2.2.
Todd C. Miller MirOS BSD #10-current August 17, 1997 1
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