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81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* dirname.c -- return all but the last element in a path
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Copyright (C) 1990, 1998 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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#else
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char *malloc ();
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#endif
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#if defined STDC_HEADERS || defined HAVE_STRING_H
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# include <string.h>
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#else
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# include <strings.h>
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# ifndef strrchr
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# define strrchr rindex
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# endif
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#endif
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#include "dirname.h"
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/* Return the leading directories part of PATH,
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allocated with malloc. If out of memory, return 0.
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Assumes that trailing slashes have already been
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removed. */
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char *
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dir_name (const char *path)
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{
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char *newpath;
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char *slash;
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int length; /* Length of result, not including NUL. */
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slash = strrchr (path, '/');
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if (slash == 0)
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{
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/* File is in the current directory. */
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path = ".";
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length = 1;
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}
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else
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{
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/* Remove any trailing slashes from the result. */
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#ifdef MSDOS
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char *lim = (path[0] >= 'A' && path[0] <= 'z' && path[1] == ':')
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? path + 2 : path;
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/* If canonicalized "d:/path", leave alone the root case "d:/". */
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while (slash > lim && *slash == '/')
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--slash;
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#else
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while (slash > path && *slash == '/')
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--slash;
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#endif
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length = slash - path + 1;
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}
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newpath = (char *) malloc (length + 1);
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if (newpath == 0)
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return 0;
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strncpy (newpath, path, length);
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newpath[length] = 0;
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return newpath;
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}
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