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/* $OpenBSD: dirname.c,v 1.15 2013/09/30 12:02:33 millert Exp $ */ |
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/* |
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* Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <errno.h> |
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#include <libgen.h> |
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#include <limits.h> |
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#include <string.h> |
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/* A slightly modified copy of this file exists in libexec/ld.so */ |
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char * |
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dirname(const char *path) |
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{ |
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static char dname[PATH_MAX]; |
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size_t len; |
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const char *endp; |
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/* Empty or NULL string gets treated as "." */ |
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if (path == NULL || *path == '\0') { |
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dname[0] = '.'; |
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dname[1] = '\0'; |
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return (dname); |
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} |
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/* Strip any trailing slashes */ |
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endp = path + strlen(path) - 1; |
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while (endp > path && *endp == '/') |
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endp--; |
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/* Find the start of the dir */ |
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while (endp > path && *endp != '/') |
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endp--; |
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/* Either the dir is "/" or there are no slashes */ |
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if (endp == path) { |
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dname[0] = *endp == '/' ? '/' : '.'; |
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dname[1] = '\0'; |
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return (dname); |
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} else { |
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/* Move forward past the separating slashes */ |
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do { |
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endp--; |
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} while (endp > path && *endp == '/'); |
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} |
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len = endp - path + 1; |
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if (len >= sizeof(dname)) { |
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errno = ENAMETOOLONG; |
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return (NULL); |
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} |
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memcpy(dname, path, len); |
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dname[len] = '\0'; |
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return (dname); |
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} |