/* $OpenBSD: dirname.c,v 1.16 2019/01/25 00:19:25 millert Exp $ */ /* * Copyright (c) 1997, 2004 Todd C. Miller * * 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 #include #include #include /* A slightly modified copy of this file exists in libexec/ld.so */ char * dirname(const char *path) { static char dname[PATH_MAX]; 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); }