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Initial revision

/*
 * Copyright (c) 1997, 2004 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.
 */

#include <errno.h>
#include <libgen.h>
#include <string.h>
#include <sys/param.h>

char *
dirname(const char *path)
{
        static char dname[MAXPATHLEN];
        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);
}