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File: [local] / prex-old / usr / lib / libc / gen / dirname.c (download)
Revision 1.1.1.1 (vendor branch), Tue Jun 3 09:38:47 2008 UTC (16 years, 2 months ago) by nbrk
Yeah, this is an initial import of Prex, portable real-time microkernel operating system. I wanna hack it for non-profit but fun, so let it in. |
/* * 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 * dirname(const char *path) { static char dname[MAXPATHLEN]; 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); }