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/* $OpenBSD: dirname.c,v 1.17 2020/10/20 19:30:14 naddy Exp $ */
/*
* Copyright (c) 1997, 2004 Todd C. Miller <millert@openbsd.org>
*
* 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.
*/
#include <errno.h>
#include <libgen.h>
#include <limits.h>
#include <string.h>
/* A slightly modified copy of this file exists in libexec/ld.so */
char *
dirname(char *path)
{
static char dname[PATH_MAX];
size_t len;
const char *endp;
/* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') {
dname[0] = '.';
dname[1] = '\0';
return (dname);
}
/* Strip any 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) {
dname[0] = *endp == '/' ? '/' : '.';
dname[1] = '\0';
return (dname);
} else {
/* Move forward past the separating slashes */
do {
endp--;
} while (endp > path && *endp == '/');
}
len = endp - path + 1;
if (len >= sizeof(dname)) {
errno = ENAMETOOLONG;
return (NULL);
}
memcpy(dname, path, len);
dname[len] = '\0';
return (dname);
}
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