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/* $OpenBSD: dirname.c,v 1.10 2003/06/17 21:56:23 millert Exp $ */
/*
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: dirname.c,v 1.10 2003/06/17 21:56:23 millert Exp $";
#endif /* not lint */
#include <errno.h>
#include <libgen.h>
#include <string.h>
#include <sys/param.h>
char *
dirname(const char *path)
{
static char bname[MAXPATHLEN];
register const char *endp;
/* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') {
(void)strlcpy(bname, ".", sizeof bname);
return(bname);
}
/* Strip trailing slashes */
endp = path + strlen(path) - 1;
while (endp > path && *endp == '/')
endp--;
/* Find the start of the dir */
while (endp > path && *endp != '/')
endp--;
/* Either the dir is "/" or there are no slashes */
if (endp == path) {
(void)strlcpy(bname, *endp == '/' ? "/" : ".", sizeof bname);
return(bname);
} else {
do {
endp--;
} while (endp > path && *endp == '/');
}
if (endp - path + 2 > sizeof(bname)) {
errno = ENAMETOOLONG;
return(NULL);
}
strlcpy(bname, path, endp - path + 2);
return(bname);
}
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