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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* path-concat.c -- concatenate two arbitrary pathnames
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Copyright (C) 1996, 1997, 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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/* Written by Jim Meyering. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifndef HAVE_MEMPCPY
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# define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
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#endif
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#include <stdio.h>
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#if HAVE_STRING_H
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# include <string.h>
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#endif
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#include <sys/types.h>
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char *malloc ();
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/* Concatenate two pathname components, DIR and BASE, in newly-allocated
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storage and return the result. Return 0 if out of memory. Add a slash
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between DIR and BASE in the result if neither would contribute one.
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If each would contribute at least one, elide one from the end of DIR.
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Otherwise, simply concatenate DIR and BASE. In any case, if
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BASE_IN_RESULT is non-NULL, set *BASE_IN_RESULT to point to the copy of
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BASE in the returned concatenation. */
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char *
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path_concat (const char *dir, const char *base, char **base_in_result)
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{
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char *p;
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char *p_concat;
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size_t base_len = strlen (base);
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size_t dir_len = strlen (dir);
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p_concat = malloc (dir_len + base_len + 2);
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if (!p_concat)
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return 0;
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p = mempcpy (p_concat, dir, dir_len);
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if (*(p - 1) == '/' && *base == '/')
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--p;
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else if (*(p - 1) != '/' && *base != '/')
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*p++ = '/';
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if (base_in_result)
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*base_in_result = p;
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memcpy (p, base, base_len + 1);
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return p_concat;
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}
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