usr/lib/libc/gen/dirname.c

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This source file includes following definitions.
dirname
   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 }
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root/usr/lib/libc/gen/dirname.c

DEFINITIONS
