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Annotation of prex-old/usr/lib/libc/gen/dirname.c, Revision 1.1.1.1

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: }