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Annotation of prex-old/usr/lib/libc/gen/dirname.c, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  *
        !             4:  * Permission to use, copy, modify, and distribute this software for any
        !             5:  * purpose with or without fee is hereby granted, provided that the above
        !             6:  * copyright notice and this permission notice appear in all copies.
        !             7:  *
        !             8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !             9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            15:  */
        !            16:
        !            17: #include <errno.h>
        !            18: #include <libgen.h>
        !            19: #include <string.h>
        !            20: #include <sys/param.h>
        !            21:
        !            22: char *
        !            23: dirname(const char *path)
        !            24: {
        !            25:         static char dname[MAXPATHLEN];
        !            26:         size_t len;
        !            27:         const char *endp;
        !            28:
        !            29:         /* Empty or NULL string gets treated as "." */
        !            30:         if (path == NULL || *path == '\0') {
        !            31:                 dname[0] = '.';
        !            32:                 dname[1] = '\0';
        !            33:                 return (dname);
        !            34:         }
        !            35:
        !            36:         /* Strip any trailing slashes */
        !            37:         endp = path + strlen(path) - 1;
        !            38:         while (endp > path && *endp == '/')
        !            39:                 endp--;
        !            40:
        !            41:         /* Find the start of the dir */
        !            42:         while (endp > path && *endp != '/')
        !            43:                 endp--;
        !            44:
        !            45:         /* Either the dir is "/" or there are no slashes */
        !            46:         if (endp == path) {
        !            47:                 dname[0] = *endp == '/' ? '/' : '.';
        !            48:                 dname[1] = '\0';
        !            49:                 return (dname);
        !            50:         } else {
        !            51:                 /* Move forward past the separating slashes */
        !            52:                 do {
        !            53:                         endp--;
        !            54:                 } while (endp > path && *endp == '/');
        !            55:         }
        !            56:
        !            57:         len = endp - path + 1;
        !            58:         if (len >= sizeof(dname)) {
        !            59:                 errno = ENAMETOOLONG;
        !            60:                 return (NULL);
        !            61:         }
        !            62:         memcpy(dname, path, len);
        !            63:         dname[len] = '\0';
        !            64:         return (dname);
        !            65: }