Colony » Colony Scout

/*

 * 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 *

basename(const char *path)

{

        static char bname[MAXPATHLEN];

        size_t len;

        const char *endp, *startp;

        /* Empty or NULL string gets treated as "." */

        if (path == NULL || *path == '\0') {

                bname[0] = '.';

                bname[1] = '\0';

                return (bname);

        }

        /* Strip any trailing slashes */

        endp = path + strlen(path) - 1;

        while (endp > path && *endp == '/')

                endp--;

        /* All slashes becomes "/" */

        if (endp == path && *endp == '/') {

                bname[0] = '/';

                bname[1] = '\0';

                return (bname);

        }

        /* Find the start of the base */

        startp = endp;

        while (startp > path && *(startp - 1) != '/')

                startp--;

        len = endp - startp + 1;

        if (len >= sizeof(bname)) {

                errno = ENAMETOOLONG;

                return (NULL);

        }

        memcpy(bname, startp, len);

        bname[len] = '\0';

        return (bname);

}